{"title":"Astrographs","description":"","products":[{"product_id":"astro-tech-10-f-8-truss-tube-ritchey-chretien-optical-tube","title":"Astro-Tech 10\" f\/8 Truss Tube Ritchey-Chrétien Optical Tube","description":"This newest Version A of the Astro-Tech AT10RCT carbon fiber Serrurier truss Ritchey-Chrétien \u003cstrong\u003e\u003cem\u003e\u003cspan style=\"color: #990000;\"\u003eHot Product for 2015\u003c\/span\u003e\u003c\/em\u003e\u003c\/strong\u003e makes high quality large-aperture\/large format DSLR and CCD imaging affordable for the dedicated amateur astrophotographer and educational institution.\u003chr\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThis Astro-Tech AT10RCT Ritchey-Chrétien astrograph (named a Sky \u0026amp; Telescope Hot Product for 2015) has:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• 10\" f\/8 true Ritchey-Chrétien hyperbolic mirror optical design\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• carbon fiber truss tube design with CNC-machined stainless steel and aluminum components\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• low thermal expansion quartz primary and secondary mirrors \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• three built-in cooling fans in rear cell \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• 3\" dual-speed Crayford focuser with 2\" and 1.25\" compression ring adapters \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• focuser attachment collar isolated from the primary mirror and baffle tube\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• dust covers and finder shoe\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e This newest version of the Astro-Tech AT10RCT makes 10\" coma-free true Ritchey-Chrétien imaging available to the DSLR and large format CCD astrophotographer at a price less than that of most large format CCD cameras by themselves.\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e Featuring premium low thermal expansion quartz mirrors, rather than aluminized Pyrex glass mirrors, this reasonably-priced 10\" Astro-Tech truss-tube R-C provides the coma-free photographic field that large format CCD and DSLR astrophotographers crave, but can't get from conventional reflectors and Schmidt-Cassegrains.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e Likewise, as a pure two-mirror system, the AT10RCT has a wide spectral response and is totally free from the spurious color that affects the imaging of all but the most costly apochromatic refractors, and it does it with a 12\" aperture that dwarfs the light gathering of every commercially-available apo refractor.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e If serious astrophotography is your goal, but the price of true Ritchey-Chrétien optics has been keeping you from the optical design most modern professional observatories use, your wait is over. The 10\" Astro-Tech AT10RCT truss-tube R-C can bring the world of professional DSLR\/CCD deep space imaging to your backyard observatory at a truly affordable price.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eFeatures of this Astro-Tech AT10RCT Astrograph . . .\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eOptical design:\u003c\/strong\u003e true Ritchey-Chrétien Cassegrain-type two-mirror optics, with hyperbolic primary and secondary mirrors. The 233mm available back focus allows for the use of long CCD equipment trains.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eOptical specifications:\u003c\/strong\u003e 10\" aperture, 2000mm focal length, f\/8 focal ratio.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eHyperboloid primary mirror:\u003c\/strong\u003e Made of low thermal expansion quartz. Ground and polished under precision computer control and tested for accuracy multiple times during fabrication on Zygo interferometers. Unlike catadioptric designs (SCTs, Maksutovs, etc.) that move the primary mirror fore and aft in the optical tube to focus (which can lead to image shift and focal length changes as the mirror moves), the AT10RCT primary mirror is fixed to eliminate both image shift and focal length changes, as well as the frequent primary mirror collimation requirements of a Newtonian reflector. Primary mirror collimation is pre-set at the factory, but can be adjusted if needed using three traditional push\/pull locking adjustment screw sets.\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eHyperboloid secondary mirror: Made of low thermal expansion quartz, rather than Pyrex. Ground and polished under precision computer control and Zygo interferometer tested. Mounted in a CNC-machined four-vane spider and fully collimatable using simple standard Cassegrain reflector collimating techniques. The secondary mirror is precisely center-spotted to make collimation easier. Unlike complicated R-C designs that use motors to move the secondary mirror fore and aft to focus, which can lead to focal length changes, the AT10RCT secondary mirror is fixed and focusing is done externally by means of an optional external focuser, discussed below.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e In a review of Astro-Tech's original solid tube 8\" and 10\" R-Cs, Sky \u0026amp; Telescope said that the Astro-Tech R-C's fixed primary and secondary mirrors \"eliminate image shift, which has been the bane of Cassegrain scopes with moving-mirror focusing systems . . . It also keeps the effective focal length of the system constant, and the infinity focal point remains at a fixed point outside of the telescope, neither of which is the case with moving-mirror systems that change the separation between a Cassegrain's primary and secondary mirrors.\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eCarbon fiber truss-tube design:\u003c\/strong\u003e Three CNC-machined aluminum support rings form the basic structure of the optical tube. Light-weight and rigid carbon fiber tubes connect the support rings in a Serrurier truss design, using CNC-machined stainless steel ball and socket hardware.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The Serrurier truss solves the problem of optical tube flexure by supporting the primary and secondary mirrors with two sets of opposing trusses mounted before and after the center support ring. The trusses are designed to have an equal amount of flexure, which allows the optics to stay on a common optical axis. When flexing, the \"top\" truss resists tension and the \"bottom\" truss resists compression. This has the effect of keeping the optical elements parallel to each other. The net result is that the optical elements stay in collimation regardless of the orientation of the telescope, including passing through the meridian during imaging.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The truss tubes are made of a light weight\/high strength woven carbon fiber-reinforced composite material with extremely low thermal expansion characteristics. This reduces the possibility of temperature-related focus changes that can occur with steel or aluminum optical tube scopes during extreme temperature swing.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The Astro-Tech AT10RCT is 24.4\" (620mm) long without focuser. The supplied focuser adds 5.25\" (133mm) with the drawtube retracted. The center and rear truss tube support rings are 15.74\" (400mm) in diameter, while the front support ring is 13.38\" (340mm) in diameter. The AT10RCT weighs 33.5 lbs (15.2 kg) without focuser. The supplied focuser adds 2.2 lbs (1 kg).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003e3\" focuser:\u003c\/strong\u003e The AT10RCT is supplied with a basic light duty 3\" Crayford focuser to get you started imaging. While acceptable for casual imaging with a light imaging train (such as a light DSLR body by itself), upgrading to a high quality rack-and-pinion focuser is required for serious imaging with an optical tube of this quality. A heavy multi-component imaging train will require a rack-and-pinion focuser to support the extra weight without focus shift. Alternatively, you may already have a premium focuser being used on another scope that you would like to use for imaging.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The supplied light-duty Crayford focuser can be unthreaded from the focuser attachment collar, allowing you to use another focuser. One popular choice is the dual-speed 3\" diameter 1.5\" travel Feather Touch #3015 rack and pinion focuser, available from your Astro-Tech dealer.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The newly designed focuser attachment collar is bolted rigidly to the back plate of the AT10RCT, completely independent of the primary mirror and baffle tube. This allows it to be collimated separately from the primary and secondary mirrors if needed, using an optional #FCR1012 focuser collimating ring. The focuser attachment collar has a male 117m x 1mm pitch thread for attaching the focuser.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The Feather Touch #3015 normally comes with a 109mm threaded collar for connecting to a scope. Using the #3015 with the AT10RCT therefore requires an optional #M117x1 Feather Touch adapter. The #M117x1 adapter threads onto the focuser attachment port. The #3015 focuser (without its 109mm collar) then slips into the #M117x1 adapter and is held in place by three large brass Delrin-tipped retaining knobs. Only focusers with a maximum 1.5\" drawtube travel, such as the Feather Touch #3015, are recommended for use with the 12\" Astro-Tech AT10RCT Ritchey-Chrétien. For other focusers, such as a MoonLite, contact the focuser manufacturer for an adapter to fit the 117mm x 1mm port on the rear of the scope.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The image plane is located 9.2\" behind the rear cell (233mm from the top of the focuser attachment port). To fine-tune the back focus of the AT10RCT to the requirements of your camera and equipment train, three threaded extension rings (one 2\" in length and two 1\" in length) are provided to thread singly or in combination between the 117mm port on the AT10RCT rear cell and the focuser of your choice. These provide a flex-free solid metal extension that changes the distance between your chosen focuser and the rear cell. This lets you accommodate the varying back-focus requirements of DSLR-type camera imaging versus long equipment train CCD imaging. The 2\" x 117mm diameter threaded ring weighs 14.4 ounces; each 1\" ring weighs 7.2 oz.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eEquatorial mount recommendations:\u003c\/strong\u003e Because of the 33.5 pound (15.2 kg) weight of the AT10RCT (without focuser), plus the weight of your focuser, camera equipment, and any photoguide scope, installing the AT10RCT on a German equatorial mount with a 45 pound (minimum) to 100 pound or greater payload capacity is recommended. Such mounts include the 60 pound capacity CEM60, the 50 pound capacity Celestron CGX or 75 pound capacity CGX-L and the Losmandy 60 pound capacity G11 or 100 pound capacity HGM Titan. Other suitable mounts are also available from Software Bisque and Astro-Physics.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eCooling fans:\u003c\/strong\u003e To allow the AT10RCT to reach ambient temperatures more quickly for optimum imaging performance, there are three small low vibration\/high CFM primary mirror cooling fans built into the rear cell. The high speed DC fans are powered by a standard equipment battery pack that plugs into a jack on the rear cell. The battery pack uses eight user-supplied AA batteries. An optional external DC power supply, such as a rechargeable 12VDC battery pack can also be used to power the fans.\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eTwo dovetail mounting rails: Two 9.8\" Losmandy-style \"D-plate\" dovetail rails are provided for installing the AT10RCT on an equatorial mount, as well as for mounting optional accessories (such as rings for a photoguide scope). One dovetail, positioned underneath the 15.75\" maximum diameter by 24.4\" long (without focuser) optical tube, connects the AT10RCT to your equatorial mount. The second rail, 180° away from the first, will then be on top of the tube for installing a photoguide scope or any other accessory that attaches to a scope by means of Losmandy-style \"D-plate\" dovetail adapters. The undersides of the dovetails have been hollowed out to lighten their weight without compromising their strength.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eOther accessories:\u003c\/strong\u003e This new Version A of the AT10RCT includes slip-on dust covers for both the primary and secondary mirrors. Also included is a mounting shoe for a red dot-type finder, such as the Astro-Tech ATF. The mounting shoe can also accept the Astro-Tech ATF50QRB 50mm finderscope quick release bracket.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eTech Details: \u003c\/span\u003e\u003c\/h2\u003e\n\u003ctable id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e10\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2000mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e33.5 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.46 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eRitchey-Chrétien\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e13.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBack Focus\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e233mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40217129680969,"sku":"AT10RCT","price":3195.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/20152_2.jpg?v=1662793486"},{"product_id":"astro-tech-8-f-8-ritchey-chretien-astrograph-carbon-fiber-tube","title":"Astro-Tech 8\" f\/8 Ritchey-Chrétien Astrograph, Carbon Fiber Tube","description":"\u003cp\u003eThe Astro-Tech AT8RC is the \u003cem\u003efirst \u003c\/em\u003eaffordable 8\" Ritchey-Chrétien with premium features available to the amateur astronomer who is into serious deep space imaging. \u003cem\u003eSky \u0026amp; Telescope \u003c\/em\u003e agrees, as they named the AT8RC a \u003cem\u003e\u003cspan style=\"font-family: verdana; font-size: 13px; color: #990000;\"\u003eSky \u0026amp; Telescope Hot Product for 2010\u003c\/span\u003e. \u003c\/em\u003eA review in the December 2009 \u003cem\u003eSky \u0026amp; Telescope\u003c\/em\u003e said \"it was how nicely this scope is matched to APS-C and 35mm formats that really wowed me.\"\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThis Astro-Tech AT8RC Ritchey-Chrétien astrograph has:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• 8\" f\/8 true Ritchey-Chrétien hyperbolic mirror optical design\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• High strength\/low thermal expansion carbon fiber optical tube \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• ten contrast-enhancing main tube knife edge light baffles \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• dual-speed linear Crayford focuser\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• 2\" and 1.25\" compression ring accessory holders \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• two dovetail rails - one Vixen-style and one Losmandy-style \"D-plate\"\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe AT8RC that Astro-Tech helped develop was the first sensibly-priced 8\" true Ritchey-Chrétien astrograph available from a U. S. company. Sensibly-priced? Yes - but with premium features like a carbon fiber body, quartz mirrors, two dovetail mounting rails, and more that led Sky \u0026amp; Telescope magazine to name it a Hot Product for 2010, along with its larger 10\" brother, the AT10RC.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eAs Sky \u0026amp; Telescope pointed out in their Hot Product citation, \"Ritchey-Chrétien reflectors are highly regarded among today's elite astrophotographers, and premium instruments often carry price tags starting at about $1,000 per inch of aperture. So it's the best kind of \"sticker shock\" to see the prices for Astro-Tech's 8- and 10-inch f\/8 Ritchey-Chrétiens, which pack features too numerous to list here. Our review of the 8-inch scope appears in December 2009, and our initial hands-on look at the 10-inch suggests that it will be equally exciting for deep sky astrophotographers.\" Excerpts from the December Sky \u0026amp; Telescope review are quoted below.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe Ritchey-Chrétien optical design is used in virtually every recent large mega-million dollar professional observatory telescope - including the Hubble Space Telescope. And more \"affordable\" true coma-free Ritchey-Chrétien optical systems made for schools and individuals by commercial R-C manufacturers typically come only in large apertures and often start at well over $1,000 per inch of aperture, as noted above by Sky \u0026amp; Telescope. Their size and cost put them out of the reach of most amateur astronomers. At least, true Ritchey-Chrétiens used to start at out-of-reach prices.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe Astro-Tech AT8RC astrograph (a telescope designed specifically for photographing comparatively wide areas of the sky) makes the coma-free imaging of true Ritchey-Chrétien imaging optics available to the DSLR and CCD astrophotographer at a price less than that of most CCD cameras. It is not designed for digiscoping through an eyepiece. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe December 2009 issue of Sky \u0026amp; Telescope said \"during the 1970s, there was an explosive growth of the hobby of deep-sky astrophotography that parallels the growing popularity of 8-inch f\/10 Schmidt-Cassegrain telescopes. These scopes delivered decent star images across a field about 3\/4° in diameter with enough resolution to record detail in small star clusters, nebulae, and galaxies. The AT8RC does that with even better star images, a larger field, and a slightly faster focal ratio. What's not to like?!\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eDesigned for exceptional imaging, the Astro-Tech AT8RC provides the wide coma-free photographic field that DSLR and CCD astrophotographers crave, but can't get from conventional reflectors and Schmidt-Cassegrains. Likewise, as a pure two-mirror system, the AT8RC is totally free from the spurious color that affects the imaging of all but the most costly apochromatic refractors, and it does it with an 8\" aperture that dwarfs the light gathering of most apo refractors.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe AT8RC photo of IC1396, the \"Elephant's Trunk Nebula,\" is from AT8RC owner John O'Neill. It was taken with an SBIG ST-10XME CCD camera and Astrodon filters. According to John, \"This scope performed exceptionally well, but the camera distance from the back of the scope may be a bit unsettling for some users.\" (See the section on the Crayford focuser, below, for an explanation.)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\"The performance of the 8\" surprised me,\" John continued. \"I was able to get plenty of data using relatively short exposures of 400 sec x 4 through LRGB filters. Can't wait for the 12\" RC to be produced.\" \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eIf serious astrophotography is your goal, but the price of most true Ritchey-Chrétien optics has been keeping you from the optical design most modern professional observatories and the Hubble Space Telescope use for their imaging, your wait is over. The Astro-Tech AT8RC astrograph can bring the world of professional DSLR\/CCD deep space imaging to your backyard observatory at a truly affordable price.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe December 2009 issue of Sky \u0026amp; Telescope said about the Astro-Tech AT8IN 8\" F\/4 imaging Newtonian optical tube, AT6RC, and AT8RC, \"of the three scopes, I liked this one (the AT8RC) the best. Its advanced features beyond those of the six-inch RC - carbon-fiber tube, quartz optics, and dual mounting rails (Losmandy and Vixen-style dovetails) - were part of the reason. But it was how nicely this scope is matched to APS-C and 35-mm formats that really wowed me.\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eSky \u0026amp; Telescope concluded by saying, \"Astro-Tech has done a great job of balancing performance and price on all three of these imaging telescopes. By optimizing them for use with the cameras that many beginning and intermediate-level astrophotographers are using, the company has created affordable instruments that can produce stunning images. It's an exciting time to be entering the field of deep-sky astrophotography.\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eFeatures of this Astro-Tech AT8RC Astrograph . . .\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eOptical design:\u003c\/strong\u003e true Ritchey-Chrétien Cassegrain-type two-mirror optics, with hyperbolic primary and secondary mirrors.\u003c\/span\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eOptical specifications:\u003c\/strong\u003e 8\" aperture, 1625mm focal length, f\/8 focal ratio.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eHyperboloid primary mirror:\u003c\/strong\u003e Ground and polished under precision computer control to diffraction-limited or better surface accuracy. Unlike catadioptric designs (SCTs, Maksutovs, etc.) that move the primary mirror fore and aft in the optical tube to focus (which can lead to image shift as the mirror position changes) the AT8RC primary mirror is fixed to eliminate both a catadioptric's image shift and the primary mirror collimation requirements of a Newtonian reflector.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eHyperboloid secondary mirror:\u003c\/strong\u003e Ground and polished under precision computer control to diffraction-limited or better surface accuracy. Mounted in a four-vane spider and fully collimatable using simple standard Cassegrain reflector collimating techniques. Unlike complicated R-C designs that use motors to move the secondary mirror fore and aft to focus, the AT8RC secondary mirror is fixed and focusing is done externally.\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe December 2009 issue of Sky \u0026amp; Telescope said that the Astro-Tech R-Cs' fixed primary and secondary mirrors \"eliminate image shift, which has been the bane of Cassegrain scopes with moving-mirror focusing systems . . . It also keeps the effective focal length of the system constant, and the infinity focal point remains at a fixed point outside of the telescope, neither of which is the case with moving-mirror systems that change the separation between a Cassegrain's primary and secondary mirrors.\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eCarbon fiber optical tube:\u003c\/strong\u003e Made of light weight\/high strength woven carbon fiber-reinforced composite material with extremely low thermal expansion characteristics to reduce the possibility of temperature-related focus changes that can occur with rolled steel tube systems during extreme temperature swings. Die-cast and machined aluminum front and rear cells. The 9\" o.d. x 18\" long carbon fiber tube is virtually indestructible. The use of a carbon fiber composite reduces the weight of the optical tube with no loss of strength or rigidity compared to a steel tube. Carbon fiber composites are so strong that the new $200,000,000 Boeing 787 Dreamliner passenger jet will use a wing and fuselage made almost entirely out of carbon fiber. Because of the use of a carbon fiber optical tube, the weight of this 8\" R-C is only a little more than two pounds heavier than the steel tube 6\" Astro-Tech R-C.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe December 2009 issue of Sky \u0026amp; Telescope said \"the carbon-fiber tube did a good job of holding focus over the modest temperature changes occurring during my summer evenings. More telling, perhaps, was the scope's tendency to remain accurately focused after several days of inactivity during which the temperature in my backyard observatory would cycle over a huge range.\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eMultiple internal light baffles:\u003c\/strong\u003e Computer optimized primary and secondary baffling. Ten contrast-enhancing glare-stop baffles in the optical tube; multiple glare-stop microbaffles in the secondary mirror light shield; and five baffles in the primary mirror baffle tube provide truly dark sky backgrounds during imaging.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eDual-speed linear Crayford focuser:\u003c\/strong\u003e A new design 2\" Crayford focuser is threaded onto the 90mm x 1mm pitch rear cell of the AT8RC. The matte black interior of the new longer 50mm travel drawtube has anti-reflection threading for high contrast. The focuser can be rotated to any convenient angle for the sake of photographic composition by simply loosening the collar that secures the focuser to the scope body, rotating the focuser to the desired angle, and tightening the collar to lock the focuser in the new orientation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe new bearing-less linear focuser has a polished stainless steel drive rail that runs the length of the drawtube, rather than having the stainless steel drive shaft simply press directly on (and wear) the aluminum drawtube as with conventional Crayford focusers. The drive rail rides in a self-lubricating track that extends most of the length of the focuser body. The drive rail and its attached drawtube are thereby supported over most of their length at all times, rather than by a conventional Crayford focuser's two sets of small contact area roller bearings. This system distributes the drive force evenly over the entire drawtube, without concentrating it on a few small contact points. The result is less potential drawtube flexure and no wear (much less uneven wear) on the drawtube.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe precision-made non-vignetting focuser has dual-speed focusing. There are two coarse focusing knobs. The right knob also has a smaller concentric knob with a 10:1 reduction gear microfine focusing ratio. This provides exceptionally precise image control during critical imaging. All focus knobs are ribbed, so they are easy to operate, even while wearing gloves or mittens in cold weather. Multiple internal baffles in the focuser drawtube assure high contrast.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eDespite the new more rigid focuser design, the weight of very heavy equipment trains (camera, plus filter wheel, plus temperature-compensated electric focuser, etc.) may cause the 50mm long focuser drawtube to tilt slightly when fully extended, affecting the focus. Three threaded extension rings (two 1\" in length and one 2\") are provided to install singly or in combination between the AT8RC rear cell and the focuser. These provide a flex-free solid metal extension that changes the distance between the focuser and the rear cell. This lets you accommodate the varying back-focus requirements of DSLR-type camera imaging versus long equipment train CCD imaging, while minimizing the need to extend the focuser drawtube. Additional optional 1\" and 2\" long threaded extension rings are available to fine-tune the back focus as needed, as well as optional Astro-Tech 2\" compression ring extension tubes that fit into the focuser drawtube.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe image plane is located 10\" behind the rear cell. With the standard dual-speed Crayford focuser installed on the scope, there is 159.71mm of back focus available from the top surface of the 2\" accessory holder to the image plane.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eFor exceptionally long and heavy imaging equipment trains, the standard Crayford focuser can be user-replaced by an optional 1.5\" travel Feather Touch focuser from Starlight Instruments, #FT-1.5BC. This requires a 90mm x 1mm pitch rear cell thread to Feather Touch adapter, #M90X1. Optional MoonLite focusers from MoonLite Telescope Accessories can also be used.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eFor even more impressive coma-free imaging with the AT8RC, consider adding the Astro-Tech AT2FF field flattener. While not specifically designed to work with Ritchey-Chrétien astrographs, images taken with the field flattener by Astro-Tech R-C owners have shown that the Astro-Tech 2\" field flattener works remarkably well with these advanced coma-free reflectors as well as with refractors. This modestly-priced imaging accessory essentially eliminates the residual field curvature inherent in all reflector telescope designs, so that the coma-free star images remain point-like all across the field. An optical analysis and ray tracing of the field flattener was done in ZEMAX and applied to the R-Cs by Roger Ceragioli, the noted optical designer who did the final optimization of the Astro-Tech Ritchey-Chrétien optics. Here is what he had to say about the #AT2FF, \"My conclusion, which seems supported by what users are saying, is that you don't need any other field flattener. This one performs well over a 40mm image circle in all three small RCs (6\", 8\", and 10\").\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eTwo compression ring accessory holders:\u003c\/strong\u003e The focuser drawtube ends in a 2\" accessory holder that uses a non-marring soft brass compression ring to hold 2\" imaging accessories in place. The compression ring won't scratch the barrel of your accessories as an ordinary thumbscrew can. Also supplied is a 1.25\" accessory holder that slips into the 2\" compression ring holder to let you use 1.25\" imaging accessories. Like the 2\" accessory holder on the drawtube, the 1.25\" adapter also uses a non-marring soft brass compression ring.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eTwo dovetail mounting rails:\u003c\/strong\u003e Two dovetail rails are provided for installing the AT8RC on an equatorial mount, as well as for mounting optional accessories (such as a photoguide scope) on top of the AT8RC. One is a Losmandy-style \"D-plate\" dovetail rail that runs the full length of the underside of the optical tube, for installing the AT8RC on a Losmandy-style equatorial mount. The second is a Vixen-style dovetail rail that runs the full length of the top of the tube. This can be used for installing a photoguide ring set, piggyback camera adapter, or any other accessory that attaches to a scope by means of Vixen-style dovetail adapters. If the AT8RC is rotated 180°, it will bring the Vixen-style rail to the bottom of the tube so it can be used to install the AT8RC on a Vixen-style equatorial mount. Competitors provide only one Vixen-style dovetail. Providing two dovetail rails on the Astro-Tech AT8RC does not limit your choice of mounts or accessory mounting options, as can happen with similar scopes provided with only one mounting rail.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eFinderscope dovetail:\u003c\/strong\u003e a Vixen-style finderscope bracket dovetail base is installed on the upper left side of the optical tube. It can easily be removed if not needed. It will accept Vixen-style finderscope brackets as well as red dot-type finders, such as the Astro-Tech #ATF.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eOther accessories:\u003c\/strong\u003e A snap-in dust cap is standard.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eTech Details: \u003c\/span\u003e\u003c\/h2\u003e\n\u003ctable id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBinary and Star Cluster Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1625mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGalaxy and Nebula Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLunar Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e16.4 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePlanetary Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.57 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eRitchey-Chrétien\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBack Focus\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e\n\u003cp\u003e10 (254mm) from rear cell, 6.25 (159mm) with standard focuser installed\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eSupplied Accessories: \u003c\/h2\u003e\n\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003e• 2\" and 1.25\" compression ring accessory holders \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• two dovetail rails - one Vixen-style \u003c\/span\u003e\u003cem\u003eand \u003c\/em\u003e\u003cspan\u003eone Losmandy-style \"D-plate\"\u003c\/span\u003e\u003c\/p\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40221663723593,"sku":"AT8RC","price":1395.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/15477.jpg?v=1662967711"},{"product_id":"astro-tech-8-f-4-imaging-newtonian-optical-tube","title":"Astro-Tech 8\" f\/4 Imaging Newtonian Optical Tube","description":"\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eA review of three Astro-Tech astrographs (the AT6RC and AT8RC Ritchey-Chrétiens, as well as this AT8IN Imaging Newtonian) in the December 2009 issue of Sky \u0026amp; Telescope said \"While all three of the Astro-Tech scopes represent excellent value, the AT8IN, with its 8-inch aperture and $499 price tag, wins the biggest-bang-for-the-buck award . . . there's a quality to this scope that seems contradictory to its relatively low cost.\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThis Astro-Tech Imaging Newtonian optical tube has:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• very fast f\/4 focal ratio 8\" Newtonian reflector optics\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• contrast-enhancing extended tube length with 15 internal baffles \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• built-in cooling fan for faster primary mirror cooldown \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• 2\" dual-speed Crayford focuser with 2\" and 1.25\" compression ring accessory adapters \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• 8 x 50mm finderscope in a quick-release bracket \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• dual split hinged mounting rings\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThis 8\" Astro-Tech AT8IN optical tube is a very fast focal ratio f\/4 reflector that has been optimized for wide field deep space imaging. It can be used with 35mm cameras, DSLRs, web-cams, DSI-type cameras, and large format CCD cameras alike.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eAstronomy named the Astro-Tech AT8IN a Star Product for 2010, saying \"Astronomy Technologies has optimized the AT8IN for astroimaging, but the scope is just as adept for backyard viewing . . . a versatile instrument that will take you into the depths of the universe in style.\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The light weight standard equipment mounting rings of the Astro-Tech Imaging Newtonian allow you to use it on a wide variety of dovetail plates and German equatorial mounts - from the most basic to the most elaborate high payload go-to system.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eIn addition to deep space imaging, the Astro-Tech AT8IN is also usable for solar system imaging as well as deep space and solar system visual observing. Solar system visual contrast will be somewhat reduced compared to a longer focal ratio reflector because of the AT8IN's larger secondary mirror that has been optimized for full-field photographic illumination. However, the visual performance will still be much more than acceptable, and the 800mm focal length of this Astro-Tech makes it quite possible to achieve the high powers needed for detailed lunar and planetary observing. Simply add optional 1.25\" or 2\" eyepieces, and perhaps an optional Barlow lens, and this Astro-Tech Imaging Newtonian will provide you with crisp and sharply detailed close-up views of the Moon and planets.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThis Astro-Tech Telescope's Optical System . . .\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eNewtonian reflector optics:\u003c\/strong\u003e 8\" aperture, 800mm focal length, f\/4 focal ratio, parabolic primary mirror; 70mm m.a. elliptical diagonal mirror. The mirrors are ground and polished under computer control for guaranteed diffraction limited performance, coated with 91% reflectivity aluminum, and overcoated with a protective layer of silicon dioxide (quartz) for long life. \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe mirrors are made of B270 \"water white\" optical crown glass that is free of internal stress and striae. B270 glass is equivalent to BK7 in performance and optical quality. The thermal stability of B270 glass is generally better than the soda lime float glass used for the mirrors of most reflectors in this reasonable price range. For maximum contrast, the four secondary mirror spider vanes have been optimized to be as thin as possible without losing stability.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eNo-tool push-pull mirror cell:\u003c\/strong\u003e The die-cast aluminum primary mirror cell has six large hand adjust push-pull collimation knobs. These make it easy to collimate the primary mirror without tools, even while wearing gloves or mittens in cold weather. To further ease collimation, the primary mirror is precisely center-spotted. The Sky \u0026amp; Telescope review praised the \"solidly made\" primary mirror cell and secondary mirror holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eBuilt-in cooling fan:\u003c\/strong\u003e A low-vibration\/high CFM fan is mounted on the primary mirror cell. The fan is powered by a supplied battery pack that uses eight user-supplied AA batteries. Alternatively, the fan can be powered by a 12 VDC rechargeable battery if one is being used to power your mount's drive system.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eExtended optical tube with 15 internal baffles:\u003c\/strong\u003e To increase the contrast, the optical tube of the Astro-Tech AT8IN is extended 8.75\" forward of the focuser centerline to act as a lens shade to keep ambient light from hitting the diagonal mirror. In addition, there are 15 internal knife-edge baffles installed down the interior length of the optical tube to eliminate any stray light that might get past the extended optical tube and lower the contrast. The baffles and tube interior are finished in matte black to further absorb stray light. The result is exceptional contrast, far better than a conventional reflector for both imaging and visual observing.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe white-painted 32\" long x 9\" diameter (with 9.25\" diameter front and rear cells) Astro-Tech optical tube is fabricated of rolled steel, to allow the mirrors to cool to ambient temperature more quickly. While the rolled steel optical tube is a little heavier than a more-costly aluminum tube, the Sky \u0026amp; Telescope review points out that \"it also helps make it a very rigid setup, which is a good thing for astrophotographers.\" The scope's tube end rings are sturdy die-cast aluminum, to protect the tube during transport and provide exceptionally rigid support for the optics, \"adding to the scope's overall rigidity,\" according to the Sky \u0026amp; Telescope review.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eFor essentially coma-free imaging with the AT8IN, consider adding the Astro-Tech ATCC coma corrector. This imaging accessory essentially eliminates the coma inherent in all fast focal ratio reflector telescope designs, so that the coma-free star images remain point-like all across the field.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003e2\" dual-speed Crayford focuser:\u003c\/strong\u003e The precision-made 2\" Crayford focuser drawtube ends in a 2\" accessory holder. A 1.25\" accessory adapter is standard equipment. Both the drawtube's 2\" accessory holder and the 1.25\" accessory adapter have non-marring compression ring eyepiece\/accessory holders.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe focuser has two coarse focusing knobs. One knob also has a smaller concentric knob with 10:1 ratio reduction gear microfine focusing. This provides exceptionally precise focus control during critical CCD imaging. The focus knobs have ribbed gripping surfaces so they are easy to operate, even while wearing gloves or mittens in cold weather. A drawtube tension knob on the side of the focuser lets you adjust the drag on the focuser drawtube to hold various equipment load weights while focusing. A second knob lets you lock in a precise photographic focus.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe drawtube has 34mm (1.35\") of travel. There is 80mm of back focus available from the top of the focuser's 2\" accessory holder to the image plane. A 2\" diameter x 35mm long extension tube is provided to match the back focus requirement to your particular photographic application. The 35mm extension tube has a non-marring compression ring eyepiece\/accessory holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eSplit tube rings:\u003c\/strong\u003e A pair of die-cast aluminum hinged split tube mounting rings are provided. Each ring has a flat boss on its underside with a 1\/4\"-20 thread mounting hole, flanked by two 4mm metric holes on 30mm centers, for installing the ring on a Vixen-style or Losmandy-style \"D-plate\" dovetail mounting plate. This lets you mount the scope on virtually any equatorial mount. In addition, there is a flat boss with a 4mm metric hole on the top of each ring. This allows you to install a separate dovetail on top of the optical tube for mounting photoguide rings and a guidescope or similar accessories piggyback on top of the AT8IN. The lightweight optical tube (18 pounds tube only; 21.6 pounds with rings and finderscope) rotates in its felt-lined die cast cradle rings to bring the focuser and finder to the most comfortable viewing position.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eFinderscope:\u003c\/strong\u003e 8x 50mm straight-through dark crosshair achromatic design, in a spring-loaded quick-release mounting bracket. The finder has a long and comfortable 13mm eye relief. To focus the finder, loosen the trim ring behind the objective lens cell, screw the lens cell in or out to focus, and tighten the trim ring to lock in the correct focus.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eTech Details: \u003c\/span\u003e\u003c\/h2\u003e\n\u003ctable id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBinary and Star Cluster Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eVery Good\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e800mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGalaxy and Nebula Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eVery Good\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e18 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e320x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLunar Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eGreat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e21.6 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePlanetary Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eVery Good\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.57 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eSupplied Accessories: \u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e8 x 50mm finderscope in quick-release bracket\u003c\/li\u003e\n\u003cli\u003eCooling fan and battery pack\u003c\/li\u003e\n\u003cli\u003eHinged split tube rings\u003c\/li\u003e\n\u003cli\u003e35mm x 2\" compression ring extension tube\u003c\/li\u003e\n\u003cli\u003e2\" and 1.25\" compression ring eyepiece\/accessory holders\u003c\/li\u003e\n\u003cli\u003eDust cover\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40221666902089,"sku":"AT8IN","price":549.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/17402.jpg?v=1662967805"},{"product_id":"astro-tech-6-f-4-imaging-newtonian-optical-tube","title":"Astro-Tech 6\" f\/4 Imaging Newtonian Optical Tube","description":"This new light weight 6\" f\/4 Astro-Tech imaging Newtonian reflector makes serious very wide field astrophotography possible with even a small equatorial mount, and at a lower cost than ever before . . .\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eThis Astro-Tech Imaging Newtonian optical tube has:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eVery fast f\/4 focal ratio 6\" Newtonian reflector optics\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eContrast-enhancing extended tube length \u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003e2\" dual-speed linear bearing Crayford focuser with 2\" and 1.25\" compression ring accessory adapters \u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003e8 x 50mm finderscope in a quick-release bracket \u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eDual split hinged mounting rings\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThis 6\" Astro-Tech AT6IN optical tube is a very fast focal ratio f\/4 reflector that has been optimized for very wide field deep space imaging. It can be used with 35mm cameras, DSLRs, web-cams, DSI-type cameras, and large format CCD cameras alike.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe light weight standard equipment mounting rings of the Astro-Tech Imaging Newtonian allow you to use it on a wide variety of dovetail plates and German equatorial mounts - from the most basic to the most elaborate high payload go-to system.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eIn addition to deep space imaging, the Astro-Tech AT6IN is also usable for solar system imaging as well as deep space and solar system visual observing. Solar system visual contrast will be somewhat reduced compared to a longer focal ratio reflector because of the AT6IN's larger secondary mirror that has been optimized for full-field photographic illumination. However, the visual performance will still be much more than acceptable, and the 610mm focal length of this Astro-Tech makes it quite possible to achieve the high powers needed for detailed lunar and planetary observing. Simply add optional 1.25\" or 2\" eyepieces, and perhaps an optional Barlow lens, and this Astro-Tech Imaging Newtonian will provide you with crisp and sharply detailed close-up views of the Moon and planets.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eThis Astro-Tech Telescope's Optical System . . .\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eNewtonian reflector optics: 6\" aperture, 610mm focal length, f\/4 focal ratio. Parabolic primary mirror. Both primary and diagonal mirrors are ground and polished under computer control for guaranteed diffraction limited performance, coated with 91% reflectivity aluminum, and overcoated with a protective layer of silicon dioxide (quartz) for long life.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe mirrors are made of B270 \"water white\" optical crown glass that is free of internal stress and striae. B270 glass is equivalent to BK7 in performance and optical quality. The thermal stability of B270 glass is generally better than the soda lime float glass used for the mirrors of most reflectors in this reasonable price range. For maximum contrast, the four secondary mirror spider vanes have been optimized to be as thin as possible without losing stability.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eNo-tool push-pull mirror cell:\u003c\/strong\u003e The die-cast aluminum primary mirror cell has six hand adjust push-pull collimation knobs. These make it easy to collimate the primary mirror without tools, even while wearing gloves or mittens in cold weather. To further ease collimation, the primary mirror is center-spotted.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eExtended optical tube:\u003c\/strong\u003e To increase the contrast, the optical tube of the Astro-Tech AT6IN is extended 7.25\" forward of the focuser centerline to act as a lens shade to keep ambient light from hitting the diagonal mirror. This results in higher contrast than a conventional reflector for both imaging and visual observing.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe white-painted 22.5\" long x 7\" diameter Astro-Tech optical tube (with 7.25\" diameter front and rear cells) is fabricated of rolled steel, to allow the mirrors to cool to ambient temperature more quickly. While the rolled steel optical tube is a little heavier than a more-costly aluminum tube, a Sky \u0026amp; Telescope review of the AT6IN's 8\" big brother AT8IN pointed out that a steel tube \"also helps make it a very rigid setup, which is a good thing for astrophotographers.\" The scope's tube end rings are sturdy die-cast aluminum, to protect the tube during transport and provide exceptionally rigid support for the optics. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eFor essentially coma-free imaging with the AT6IN, consider adding the Astro-Tech ATCC coma corrector. This imaging accessory essentially eliminates the coma inherent in all fast focal ratio reflector telescope designs, so that the coma-free star images remain point-like all across the field.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003e2\" dual-speed linear bearing Crayford focuser:\u003c\/strong\u003e The precision-made 2\" linear bearing Crayford focuser drawtube ends in a 2\" accessory holder. A 1.25\" accessory adapter is standard equipment. Both the drawtube's 2\" accessory holder and the 1.25\" accessory adapter have non-marring compression ring eyepiece\/accessory holders.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe focuser has dual-speed focusing. There are two coarse focusing knobs. The knob facing the rear of the scope also has a smaller concentric knob with a 10:1 reduction gear microfine focusing ratio. This provides exceptionally precise image control during critical imaging. All focus knobs are ribbed, so they are easy to operate, even while wearing gloves or mittens in cold weather. A lock knob underneath the focuser lets you adjust the tension on the drawtube to accommodate varying equipment loads. A large lock knob on top of the focuser lets you lock in your photographic focus. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe new linear bearing focuser has a polished stainless steel drive rail that runs the length of the underside of the drawtube. The focuser's stainless steel drive shaft presses on this drive rail to move the focuser, rather than having the hard steel drive shaft press directly on (and wear out) the softer aluminum drawtube as with conventional Crayford focusers. The steel drive rail rides in a self-lubricating track that extends almost the entire length of the focuser body. The drive rail and its attached drawtube are thereby supported over most of their length at all times, rather than by a conventional Crayford focuser's two sets of small contact area roller bearings. This system distributes the drive force evenly over the entire drawtube, without concentrating it on a few small contact points. The result is a very rigid drawtube with essentially zero flexure and no wear (much less flat spots or uneven wear) on the focuser drawtube. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe focuser drawtube has 51mm (2\") of travel. A focusing scale on top of the focuser drawtube is marked in inches and millimeters to make it easy to return to the approximate correct focus when setting up to image or observe each night.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eSplit tube rings:\u003c\/strong\u003e A pair of die-cast aluminum hinged split tube mounting rings are provided. Each ring has a flat boss on its underside with a 1\/4\"-20 thread mounting hole, flanked by two 4mm metric holes on 30mm centers, for installing the ring on a Vixen-style or Losmandy-style \"D-plate\" dovetail mounting plate. This lets you mount the scope on virtually any equatorial mount. In addition, there is a flat boss with a 4mm metric hole on the top of each ring. This allows you to install a separate dovetail on top of the optical tube for mounting photoguide rings and a guidescope or similar accessories piggyback on top of the AT6IN. The lightweight optical tube (9 pounds 10 ounces without finderscope) rotates in its felt-lined die cast cradle rings to bring the focuser and finder to the most comfortable viewing position.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eFinderscope:\u003c\/strong\u003e 8 x 50mm straight-through dark crosshair achromatic design, in a spring-loaded quick-release mounting bracket. The finder has a long and comfortable 13mm eye relief. To focus the finder, loosen the trim ring behind the objective lens cell, screw the lens cell in or out to focus, and tighten the trim ring to lock in the correct focus.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eTech Details: \u003c\/span\u003e\u003c\/h2\u003e\n\u003ctable id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e6\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBinary and Star Cluster Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eVery Good\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e610mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGalaxy and Nebula Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e9 lbs. 10 oz.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e203x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLunar Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eGreat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePlanetary Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eVery Good\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.76 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e13.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cblockquote\u003e\n\u003cul\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003c\/ul\u003e\n\u003c\/blockquote\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40221670834249,"sku":"AT6IN","price":399.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/18868.jpg?v=1662967926"},{"product_id":"astro-tech-6-f-9-ritchey-chretien-astrograph","title":"Astro-Tech 6\" f\/9 Ritchey-Chrétien Astrograph","description":"The exceptional value 6\" Astro-Tech Ritchey-Chrétien astrograph is once again available for the serious deep space astrophotographer on a budget . .\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eThis Astro-Tech AT6RC Ritchey-Chrétien astrograph has:\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003e• 6\" f\/9 true Ritchey-Chrétien hyperbolic mirror optical design\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003e• diffraction-limited or better BK-7 mirrors\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003e• enhanced aluminum optical coatings, overcoated with quartz\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003e• dual-speed 2\" Crayford focuser\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003e• 1\" and 2\" extension rings for fine-tuning the back focus\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003e• Vixen-style dovetail rail\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eDeveloped and introduced by Astro-Tech - and named a Sky \u0026amp; Tel Hot Product for 2009 - the Astro-Tech 6\" AT6RC Ritchey-Chrétien astrograph is back by popular demand!\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe Ritchey-Chrétien optical design is used in virtually every recent large mega-million dollar professional observatory telescope - including the Hubble Space Telescope. And more \"affordable\" true coma-free Ritchey-Chrétiens made for schools and individuals, with prices starting in the thousands of dollars, typically come only in large apertures whose weights require a large and expensive mount to use successfully.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eIn contrast, the Astro-Tech AT6RC is an incredibly affordable Ritchey-Chrétien astrograph (a telescope designed specifically for photographing comparatively wide areas of the sky) that virtually all astronomers can afford! At only 12.9 pounds, it can be used successfully with a wide variety of affordable equatorial mounts or piggybacked on an existing scope - no ultra-expensive astrophotography mount required.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe AT6RC is designed for coma-free imaging using webcams, Deep Sky Imager-type cameras, and DSLRs. The December 2009 issue of Sky \u0026amp; Telescope said the Astro-Tech AT6RC is \"a superb match\" for the APS-C chips used in many DSLR cameras, \"yielding a field almost 1° wide with very good star images in all but the corners of the frame.\" It is not designed for digiscoping through an eyepiece. Featuring a true Ritchey-Chrétien optical system, this very economical 6\" Astro-Tech R-C makes you wonder just what those multi-thousand dollar R-Cs have that makes them cost so much.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe M104, Sombrero Galaxy, photo above is from Bill Bradford. He sent it to us simply with the comment, \"Here is another shot with the AT6RC. Sure liking the scope.\" This image was named an astrophotography \"Picture of the Day\" on the Astronomy magazine website in July 2009.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe AT6RC lunar photo above is from an AT6RC owner, John O'Neill. It was taken with an Olympus Evolt 300 DSLR camera at 1\/200 of a second through a polarizing filter. John commented, \"I took this last full moon with the 6\" RC. I'm very impressed with this scope. I had to collimate it a bit but after doing that the images I am getting are just superb. You certainly have a winner with this scope, at any price point.\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\"This may very well be the ideal scope for DSLR users,\" John continued. \"Its fast focal ratio and wide field of view is ideal for many astro targets. I did take some shots of some deep sky objects from my light polluted neighborhood and found that the star field was pin point to the edges of my 35mm camera.\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe first light image of M81 and M82 above was made by Matthew Reiche using a modified Canon XSI, an Astro-Tech AT2F field flattener, and an Orion Atlas mount. It consists of 32 five minute exposures, plus darks, flats, and bias frames, for a total exposure of 2.5 hours. It was recorded at the Jenny Jump State Park in New Jersey. Matthew said, \"This was first light with my AT6RC and I think it's going to be a great scope.\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eDesigned for exceptional imaging with DSLRs and DSI-type cameras, the Astro-Tech AT6RC provides the wide coma-free photographic field that astrophotographers crave, but can't get from conventional reflectors and Schmidt-Cassegrains. Likewise, as a pure two-mirror system, the AT6RC is totally free from the spurious color that affects the imaging of all but the most costly apochromatic refractors, and it does it with an 6\" aperture that equals or exceeds the light gathering of most apo refractors.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe compact size and light weight of the AT6RC, and built-in Vixen-style dovetail, makes it easy for you to mount the ascope on any mid-range equatorial mount by itself or piggyback it on your existing larger scope for imaging. An optional second Vixen-style dovetail (#AT6SDP) is available for mounting on top of the AT6RC body. This allows you to piggyback accessories (such as a photoguide scope) on top of the AT6RC if the scope is installed directly on your equatorial mount.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eIf serious astrophotography is your goal, but the price of most true Ritchey-Chrétien optics has been keeping you from the optical design most modern professional observatories and the Hubble Space Telescope use for their imaging, your wait is over. The Astro-Tech AT6RC can bring the world of professional deep space imaging to your backyard observatory at a truly affordable price.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eFeatures of this Astro-Tech AT6RC Astrograph . . .\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eOptical design:\u003c\/strong\u003e true Ritchey-Chrétien two-mirror Cassegrain optics, with hyperbolic primary and secondary mirrors. 6\" aperture, 1370mm focal length, f\/9 focal ratio.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eHyperboloid primary mirror:\u003c\/strong\u003e Made of BK-7 optical glass. Polished to diffraction-limited or better surface accuracy. Unlike catadioptric designs (SCTs, Maksutovs, etc.) that move the primary mirror to focus (which can lead to image shift as the mirror moves), the AT6RC mirror is fixed to eliminate potential image shift. The fixed primary mirror also eliminates the frequent primary mirror collimation requirements of a Newtonian reflector.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe December 2009 issue of Sky \u0026amp; Telescope said that the AT6RC fixed primary and secondary mirrors \"eliminate image shift, which has been the bane of Cassegrain scopes with moving-mirror focusing systems . . . It also keeps the effective focal length of the system constant, and the infinity focal point remains at a fixed point outside of the telescope, neither of which is the case with moving-mirror systems that change the separation between a Cassegrain's primary and secondary mirrors.\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eHyperboloid secondary mirror:\u003c\/strong\u003e Made of BK-7 optical glass. Polished to diffraction-limited or better surface accuracy. Mounted in a four-vane spider and fully collimatable.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eEnhanced aluminum optical coatings:\u003c\/strong\u003e Both primary and secondary mirrors have enhanced aluminum mirror coatings, overcoated with a protective layer of quartz for long life. Reflectivity is in the 96% range, the same as the larger multi-thousand dollar R-C scopes.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eOptical tube:\u003c\/strong\u003e Painted rolled steel, 7.5\" o.d. x 19.25\" long, with die-cast and machined aluminum front and rear cells.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eInternal light baffles:\u003c\/strong\u003e Computer optimized primary and secondary baffling. Eight contrast-enhancing glare-stop baffles in the optical tube, multiple glare-stop microbaffles in the secondary mirror light shield, and four baffles in the primary mirror baffle tube provide truly dark sky backgrounds during imaging.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eDual-speed Crayford focuser:\u003c\/strong\u003e A 2\" Crayford focuser is threaded onto the 90mm x 1mm pitch rear cell of the AT6RC. The non-vignetting focuser has dual-speed focusing. There are two coarse focusing knobs. The right knob also has a smaller concentric knob with a 10:1 reduction gear microfine focusing ratio. This provides exceptionally precise image control during critical CCD imaging. All focus knobs are ribbed, so they are easy to operate, even while wearing gloves or mittens in cold weather.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eFocuser travel:\u003c\/strong\u003e Focuser drawtube travel is 34mm, while back focus between the focuser's 2\" accessory holder and the focal plane is 150mm. The December 2009 issue of Sky \u0026amp; Telescope said that \"the infinity focus of the AT6RC falls 9-3\/4\" outside the back of the telescope, allowing plenty of room for all types of cameras, filter wheels, and ancillary equipment.\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eTwo extension rings (one 1\" and one 2\") are provided to thread onto the rear of the scope (singly or in combination) between the scope rear cell and the focuser. These form a very rigid and tilt-free extension that moves the focuser out from the rear cell to accommodate the varying back-focus requirements of webcam\/Deep Sky Imager-type cameras versus DSLRs. Typically, both rings (one 1\" and one 2\") will properly position most DSLRs at the AT6RC focal plane. Sky \u0026amp; Telescope pointed out that the \"1- and 2-inch extensions, as well as conventional extension tubes that fit in the 2-inch focuser, mean that you can always assemble the system so it comes to focus with whatever camera and accessories you're using.\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eWhile it is possible to use large CCD cameras and filter wheels with the AT6RC, these cameras are generally not recommended. The weight of a standard CCD camera and the color filter wheel typically used with it may cause the focuser drawtube to tilt slightly when fully extended, affecting the focus. Adding an optional Feather Touch focuser (our part #FT-1.5BC), plus an optional 90mm x 1mm pitch adapter (our part #M90X1), will eliminate any such potential problem, although at significant additional cost (more than double the cost of the AT6RC itself).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eFor even more impressive coma-free DSLR imaging with the AT6RC, consider adding the Astro-Tech AT2FF field flattener. This modestly-priced imaging accessory essentially eliminates the residual field curvature inherent in all reflector telescope designs, so that the coma-free star images remain point-like all across the field of the APS-C size imaging chip used in most DSLR cameras. Use of the #AT2FF with a DSLR will typically requires one optional #AT2EXT 2\" extension ring, instead of the two rings generally needed with a DSLR camera alone.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eCompression ring accessory holders:\u003c\/strong\u003e The focuser drawtube ends in a 2\" accessory holder that uses a non-marring soft brass compression ring to hold 2\" imaging accessories in place. The compression ring won't scratch the barrel of your accessories as an ordinary thumbscrew can. Also supplied is a 1.25\" accessory holder that slips into the 2\" compression ring holder to let you use 1.25\" imaging accessories. Like the 2\" eyepiece holder on the eyepiece holder rotation mechanism, the 1.25\" adapter also uses a non-marring soft brass compression ring.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eMounting dovetail:\u003c\/strong\u003e a Vixen-style dovetail bar runs the length of the underside of the optical tube. The dovetail can be removed, if desired, so the AT6RC can be installed in optional user-supplied mounting rings for piggyback mounting on a larger scope. An optional #AT6SDP Vixen-style dovetail is available for mounting on top of the AT6RC to allow you to mount an optional photoguide scope on top of the astrograph.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eFinderscope dovetail:\u003c\/strong\u003e a Vixen-style finderscope bracket dovetail base is installed on the upper left side of the optical tube. It can easily be removed if not needed. It will accept Vixen-style finderscope brackets as well as red dot-type finders, such as the Astro-Tech #ATF.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eOther accessories:\u003c\/strong\u003e A snap-in dust cap is standard.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eTech Details: \u003c\/span\u003e\u003c\/h2\u003e\n\u003ctable style=\"max-width: 500px;\" id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e6\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1370mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e12.9 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.76 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eTelescope Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eRitchey-Chrétien\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eBack Focus\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e150mm with focuser installed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eSupplied Accessories: \u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong style=\"color: #21201c; font-family: tahoma, verdana, sans-serif; font-size: 16px; line-height: 27px; background-color: #ffffff;\"\u003e• 1\" and 2\" extension rings for fine-tuning the back focus\u003cbr\u003e• Vixen-style dovetail rail\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv id=\"product_tabs_additional_contents\" class=\"product-tabs-content\"\u003e\n\u003cdiv class=\"product-tabs-content-inner clearfix\"\u003e\n\u003cdiv class=\"box-add clearfix\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40481972551753,"sku":"AT6RC","price":479.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/19910.jpg?v=1675378871"},{"product_id":"astro-tech-8-f-8-ritchey-chretien-astrograph-steel-tube","title":"Astro-Tech 8\" f\/8 Ritchey-Chrétien Astrograph, Steel Tube","description":"The steel tube Astro-Tech AT8RC makes premium 8\" Ritchey-Chrétien optics for serious deep space imaging available at the lowest price ever. \u003cem\u003eSky \u0026amp; Telescope\u003c\/em\u003e named the AT8RC a \u003cem\u003eSky \u0026amp; Telescope Hot Product for 2010.\u003c\/em\u003e A review in the December 2009 Sky \u0026amp; Telescope said \"it was how nicely this scope is matched to APS-C and 35mm formats that really wowed me.\"\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThis Astro-Tech AT8RCS Ritchey-Chrétien astrograph has:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• 8\" f\/8 true Ritchey-Chrétien hyperbolic mirror optical design\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• low thermal expansion quartz primary and secondary mirrors\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• 96% reflectivity enhanced aluminum mirror coatings\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• ten contrast-enhancing main tube knife edge light baffles \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• dual-speed linear Crayford focuser\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• 2\" and 1.25\" compression ring accessory holders \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• two dovetail rails - one Vixen-style and one Losmandy-style \"D-plate\"\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe original carbon fiber tube AT8RC that Astro-Tech helped develop was the first sensibly-priced 8\" true Ritchey-Chrétien astrograph with premium features available from a U. S. company. Sky \u0026amp; Telescope magazine named it a Hot Product for 2010, along with its larger 10\" brother, the AT10RC.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eAs Sky \u0026amp; Telescope pointed out in their Hot Product citation, \"Ritchey-Chrétien reflectors are highly regarded among today's elite astrophotographers, and premium instruments often carry price tags starting at about $1,000 per inch of aperture. So it's the best kind of 'sticker shock' to see the prices for Astro-Tech's 8- and 10-inch f\/8 Ritchey-Chrétiens.\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eBe prepared for more \"sticker shock,' as the new steel tube AT8RCS is even more affordable than the original carbon fiber version.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe Astro-Tech AT8RCS astrograph (a telescope designed specifically for photographing comparatively wide areas of the sky) makes the coma-free imaging of true Ritchey-Chrétien imaging optics available to the DSLR and CCD astrophotographer at a price less than that of most CCD cameras. It is not designed for digiscoping through an eyepiece. Featuring premium low thermal expansion quartz mirrors rather than ordinary optical glass, this very economical 8\" Astro-Tech R-C makes you wonder just what those outrageously expensive R-Cs have that makes them cost so much.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eDesigned for exceptional imaging, the Astro-Tech AT8RCS provides the wide coma-free photographic field that DSLR and CCD astrophotographers crave, but can't get from conventional reflectors and Schmidt-Cassegrains. Likewise, as a pure two-mirror system, the AT8RCS is totally free from the spurious color that affects the imaging of all but the most costly apochromatic refractors, and it does it with an 8\" aperture that dwarfs the light gathering of most apo refractors.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eIf serious astrophotography is your goal, but the price of most true Ritchey-Chrétien optics has been keeping you from the optical design most modern professional observatories and the Hubble Space Telescope use for their imaging, your wait is over. The Astro-Tech AT8RCS astrograph can bring the world of professional DSLR\/CCD deep space imaging to your backyard observatory at a remarkably affordable price.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eFeatures of this Astro-Tech AT8RCS astrograph . . .\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eOptical design:\u003c\/strong\u003e true Ritchey-Chrétien Cassegrain-type two-mirror optics, with hyperbolic primary and secondary mirrors. \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eOptical specifications: 8\" aperture, 1625mm focal length, f\/8 focal ratio.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eHyperboloid primary mirror:\u003c\/strong\u003e Made of low thermal expansion quartz, rather than the ordinary optical glass used by competitors. Ground and polished under precision computer control to diffraction-limited or better surface accuracy. Unlike catadioptric designs (SCTs, Maksutovs, etc.) that move the primary mirror fore and aft in the optical tube to focus (which can lead to image shift as the mirror position changes) the AT8RCS primary mirror is fixed to eliminate both a catadioptric's image shift and the primary mirror collimation requirements of a Newtonian reflector.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eHyperboloid secondary mirror:\u003c\/strong\u003e Made of low thermal expansion quartz, rather than ordinary optical glass. Ground and polished under precision computer control to diffraction-limited or better surface accuracy. Mounted in a four-vane spider and fully collimatable using simple standard Cassegrain reflector collimating techniques. Unlike complicated R-C designs that use motors to move the secondary mirror fore and aft to focus, the AT8RCS secondary mirror is fixed and focusing is done externally.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003e96% reflectivity enhanced aluminum coated optics:\u003c\/strong\u003e Both primary and secondary mirrors are coated with 96% reflectivity enhanced aluminum, overcoated with a layer of quartz for long life.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eSteel optical tube:\u003c\/strong\u003e While not quite as resistant to temperature-related focus changes as its more expensive carbon fiber brother, the 9\" o.d. x 18\" long steel tube of the AT8RCS will require few, if any, focus adjustments during most imaging sessions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eMultiple internal light baffles:\u003c\/strong\u003e Computer optimized primary and secondary baffling. Ten contrast-enhancing glare-stop baffles in the optical tube; multiple glare-stop microbaffles in the secondary mirror light shield; and five baffles in the primary mirror baffle tube provide truly dark sky backgrounds during imaging.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eDual-speed linear Crayford focuser:\u003c\/strong\u003e A new design 2\" Crayford focuser is threaded onto the 90mm x 1mm pitch rear cell of the AT8RCS. The matte black interior of the new longer 50mm travel drawtube has anti-reflection threading for high contrast. The focuser can be rotated to any convenient angle for the sake of photographic composition by simply loosening the collar that secures the focuser to the scope body, rotating the focuser to the desired angle, and tightening the collar to lock the focuser in the new orientation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe new bearing-less linear focuser has a polished stainless steel drive rail that runs the length of the drawtube, rather than having the stainless steel drive shaft simply press directly on (and wear) the aluminum drawtube as with conventional Crayford focusers. The drive rail rides in a self-lubricating track that extends most of the length of the focuser body. The drive rail and its attached drawtube are thereby supported over most of their length at all times, rather than by a conventional Crayford focuser's two sets of small contact area roller bearings. This system distributes the drive force evenly over the entire drawtube, without concentrating it on a few small contact points. The result is less potential drawtube flexure and no wear (much less uneven wear) on the drawtube.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe precision-made non-vignetting focuser has dual-speed focusing. There are two coarse focusing knobs. The right knob also has a smaller concentric knob with a 10:1 reduction gear microfine focusing ratio. This provides exceptionally precise image control during critical imaging. All focus knobs are ribbed, so they are easy to operate, even while wearing gloves or mittens in cold weather. Multiple internal baffles in the focuser drawtube assure high contrast.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eDespite the new more rigid focuser design, the weight of very heavy equipment trains (camera, plus filter wheel, plus temperature-compensated electric focuser, etc.) may cause the 50mm long focuser drawtube to tilt slightly when fully extended, affecting the focus. Three threaded extension rings (two 1\" in length and one 2\") are provided to install singly or in combination between the AT8RCS rear cell and the focuser. These provide a flex-free solid metal extension that changes the distance between the focuser and the rear cell. This lets you accommodate the varying back-focus requirements of DSLR-type camera imaging versus long equipment train CCD imaging, while minimizing the need to extend the focuser drawtube. Additional optional 1\" and 2\" long threaded extension rings are available to fine-tune the back focus as needed, as well as optional Astro-Tech 2\" compression ring extension tubes that fit into the focuser drawtube.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe image plane is located 10\" behind the rear cell. With the standard dual-speed Crayford focuser installed on the scope, there is 159.71mm of back focus available from the top surface of the 2\" accessory holder to the image plane.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eFor exceptionally long and heavy imaging equipment trains, the standard Crayford focuser can be user-replaced by an optional 1.5\" travel Feather Touch focuser from Starlight Instruments, #FT-1.5BC. This requires a 90mm x 1mm pitch rear cell thread to Feather Touch adapter, #M90X1. Optional MoonLite focusers from MoonLite Telescope Accessories can also be used.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eFor even more impressive coma-free imaging with the AT8RCS, consider adding the Astro-Tech AT2FF field flattener. While not specifically designed to work with Ritchey-Chrétien astrographs, images taken with the field flattener by Astro-Tech R-C owners have shown that the Astro-Tech 2\" field flattener works remarkably well with these advanced coma-free reflectors as well as with refractors. This modestly-priced imaging accessory essentially eliminates the residual field curvature inherent in all reflector telescope designs, so that the coma-free star images remain point-like all across the field. An optical analysis and ray tracing of the field flattener was done in ZEMAX and applied to the R-Cs by Roger Ceragioli, the noted optical designer who did the final optimization of the Astro-Tech Ritchey-Chrétien optics. Here is what he had to say about the #AT2FF, \"My conclusion, which seems supported by what users are saying, is that you don't need any other field flattener. This one performs well over a 40mm image circle in all three small RCs (6\", 8\", and 10\").\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eTwo compression ring accessory holders:\u003c\/strong\u003e The focuser drawtube ends in a 2\" accessory holder that uses a non-marring soft brass compression ring to hold 2\" imaging accessories in place. The compression ring won't scratch the barrel of your accessories as an ordinary thumbscrew can. Also supplied is a 1.25\" accessory holder that slips into the 2\" compression ring holder to let you use 1.25\" imaging accessories. Like the 2\" accessory holder on the drawtube, the 1.25\" adapter also uses a non-marring soft brass compression ring.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eTwo dovetail mounting rails:\u003c\/strong\u003e Two dovetail rails are provided for installing the AT8RS on an equatorial mount, as well as for mounting optional accessories (such as a photoguide scope) on top of the AT8RCS. One is a Losmandy-style \"D-plate\" dovetail rail that runs the full length of the underside of the optical tube, for installing the AT8RCS on a Losmandy-style equatorial mount. The second is a Vixen-style dovetail rail that runs the full length of the top of the tube. This can be used for installing a photoguide ring set, piggyback camera adapter, or any other accessory that attaches to a scope by means of Vixen-style dovetail adapters. If the AT8RCS is rotated 180°, it will bring the Vixen-style rail to the bottom of the tube so it can be used to install the AT8RCS on a Vixen-style equatorial mount. Competitors provide only one Vixen-style dovetail. Providing two dovetail rails on the Astro-Tech AT8RCS does not limit your choice of mounts or accessory mounting options, as can happen with similar scopes provided with only one mounting rail.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eFinderscope dovetail:\u003c\/strong\u003e a Vixen-style finderscope bracket dovetail base is installed on the upper left side of the optical tube. It can easily be removed if not needed. It will accept Vixen-style finderscope brackets as well as red dot-type finders, such as the Astro-Tech #ATF.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eOther accessories:\u003c\/strong\u003e A snap-in dust cap is standard.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eTech Details: \u003c\/span\u003e\u003c\/h2\u003e\n\u003ctable class=\"table\" id=\"product-attribute-specs-table\" style=\"max-width: 500px;\" data-mce-style=\"max-width: 500px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\" data-mce-style=\"width: 25%;\"\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\" data-mce-style=\"width: 25%;\"\u003eBinary and Star Cluster Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\" data-mce-style=\"width: 25%;\"\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1625mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\" data-mce-style=\"width: 25%;\"\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\" data-mce-style=\"width: 25%;\"\u003eGalaxy and Nebula Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\" data-mce-style=\"width: 25%;\"\u003eLunar Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\" data-mce-style=\"width: 25%;\"\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e18.9 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\" data-mce-style=\"width: 25%;\"\u003ePlanetary Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\" data-mce-style=\"width: 25%;\"\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.57 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\" data-mce-style=\"width: 25%;\"\u003eTelescope Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eRitchey-Chrétien\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\" data-mce-style=\"width: 25%;\"\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\" data-mce-style=\"width: 25%;\"\u003eBack Focus\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e10 (254mm) from rear cell, 6.25 (159mm) with standard focuser installed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eSupplied Accessories:\u003c\/h2\u003e\n\u003cp\u003e• 2\" and 1.25\" compression ring accessory holders \u003cbr\u003e• two dovetail rails - one Vixen-style \u003cem\u003eand \u003c\/em\u003eone Losmandy-style \"D-plate\"\u003c\/p\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40481974419529,"sku":"AT8RCS","price":1199.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/20071.jpg?v=1675378977"},{"product_id":"astro-tech-16-f-8-truss-tube-ritchey-chretien-optical-tube","title":"Astro-Tech 16\" f\/8 Truss Tube Ritchey-Chrétien Optical Tube","description":"This newest version of the Astro-Tech AT16RCT carbon fiber Serrurier truss 16\" f\/8 Ritchey-Chrétien \u003cstrong\u003e\u003cem\u003e\u003cspan style=\"color: #990000;\"\u003eHot Product for 2015\u003c\/span\u003e\u003c\/em\u003e\u003c\/strong\u003e makes high quality large-aperture DSLR and CCD imaging affordable for the dedicated amateur astrophotographer and educational institution.\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThis newest Version A of the Astro-Tech AT16RCT Ritchey-Chrétien astrograph (named a Sky \u0026amp; Telescope Hot Product for 2015) has:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e16\" f\/8 true Ritchey-Chrétien hyperbolic mirror optical design\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003ecarbon fiber Serrurier truss tube design with CNC-machined stainless steel and aluminum components\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e18-point primary mirror floatation system\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003elow thermal expansion quartz primary and secondary mirrors \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003ethree built-in cooling fans in rear cell \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e3\" dual-speed compression ring Crayford focuser with 2\" and 1.25\" adapters \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003efocuser attachment collar isolated from the primary mirror and baffle tube\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003edust covers and finder shoe\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e \u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThis newest version of the Astro-Tech AT16RCT makes 16\" coma-free true Ritchey-Chrétien imaging available to the DSLR and large format CCD astrophotographer at a price less than that of some large format CCD cameras by themselves. \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e Featuring first-quality premium low thermal expansion quartz mirrors, rather than aluminized Pyrex glass mirrors, this reasonably-priced 16\" Astro-Tech truss-tube R-C provides the coma-free photographic field that large format CCD and DSLR astrophotographers crave, but can't get from conventional reflectors and Schmidt-Cassegrains.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e Likewise, as a pure two-mirror system, the AT16RCT has a wide spectral response and is totally free from the spurious color that affects the imaging of all but the most costly apochromatic refractors, and it does it with a 16\" aperture that dwarfs the light gathering of every commercially-available apo refractor.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e If serious astrophotography is your goal, but the price of true Ritchey-Chrétien optics has been keeping you from the optical design most modern professional observatories use, your wait is over. The 16\" Astro-Tech AT16RCT truss-tube R-C can bring the world of professional DSLR\/CCD deep space imaging to your backyard observatory at a truly affordable price.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eFor cropped sections of some astrophotos taken with the AT16RCT, courtesy of Steve Cooper, look at the feature images above. To see Steve's original full-size and uncropped Eagle Nebula image, with full details on exposure times and camera used, click on this link: \u003ca href=\"http:\/\/www.pbase.com\/ccoop\/image\/161543902\" target=\"_blank\"\u003ehttp:\/\/www.pbase.com\/ccoop\/image\/161543902\u003c\/a\u003e. To see Steve's original image of M51, also with full details on exposure times and camera used, click on this link: \u003ca href=\"http:\/\/www.pbase.com\/ccoop\/image\/161445872\" target=\"_blank\"\u003ehttp:\/\/www.pbase.com\/ccoop\/image\/161445872\u003c\/a\u003e. To see Steve's original image of NGC3718 and 3729, also with full details on exposure times and camera used, click on this link: \u003ca href=\"http:\/\/www.pbase.com\/ccoop\/image\/162653259\" target=\"_blank\"\u003ehttp:\/\/www.pbase.com\/ccoop\/image\/162653259\u003c\/a\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eFeatures of this Astro-Tech AT16RCT Ritchey-Chrétien . . .\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eOptical design:\u003c\/strong\u003e true Ritchey-Chrétien Cassegrain-type two-mirror optics, with hyperbolic primary and secondary mirrors. The 288mm usable back focus (from the end of the focuser attachment port) allows for the use of long CCD equipment trains.\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eOptical specifications: 16\" aperture, 3250mm focal length, f\/8 focal ratio. Multiple Zygo interferometer tests, during every stage of optics manufacturing (after rough figure generation, after fine figure generation, after final polish before coating, and after dielectric coating), assure premium optical performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eHyperboloid primary mirror:\u003c\/strong\u003e Made of low thermal expansion quartz. Ground and polished under precision computer control. Unlike catadioptric designs (SCTs, Maksutovs, etc.) that move the primary mirror fore and aft in the optical tube to focus (which can lead to image shift and a changing focal length and focal ratio as the mirror position changes) the AT16RCT's non-moving primary mirror is supported by an 18-point floatation system. Primary mirror collimation is pre-set at the factory, but can be adjusted if needed using three heavy-duty spring-loaded push\/pull locking adjustment screw sets.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eHyperboloid secondary mirror:\u003c\/strong\u003e Made of low thermal expansion quartz, rather than Pyrex. Ground and polished under precision computer control. Mounted in a CNC-machined four-vane spider and fully collimatable using standard Cassegrain reflector collimating techniques. The secondary mirror is precisely center-spotted to make collimation easier.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e Unlike complicated R-C designs that use motors to move the secondary mirror fore and aft to focus, the AT16RCT secondary mirror is fixed and focusing is done externally by means of an optional external focuser, discussed in the focuser section below. \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e Sky \u0026amp; Telescope said that the Astro-Tech R-C's fixed primary and secondary mirrors \"eliminate image shift, which has been the bane of Cassegrain scopes with moving-mirror focusing systems . . . It also keeps the effective focal length of the system constant, and the infinity focal point remains at a fixed point outside of the telescope, neither of which is the case with moving-mirror systems that change the separation between a Cassegrain's primary and secondary mirrors.\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The secondary mirror's baffle obstruction is 7.44\" (189mm) in diameter (46.5% by diameter and 21.62% by area of the 16\" primary.)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eCarbon fiber truss-tube design:\u003c\/strong\u003e Four CNC-machined aluminum support rings form the basic structure of the optical tube. Light-weight and rigid carbon fiber tubes connect the support rings in a Serrurier truss design, using CNC-machined stainless steel ball and socket hardware. The middle and rear support rings have a hexagonal outer shape, measuring 22.5\" (572mm) across at their widest point. They are 10mm thick. The dual front support rings provide attachment points for the secondary mirror spider vanes, as well as for the truss tubes. They measure 19.75\" (502mm) across at their widest point of their hexagonal outer shape and are 5mm thick. The AT16RCT measures only 45.5\" long (1156mm) from the front support ring to the end of the focuser mounting collar, and weighs only 77 pounds (35kg) without focuser.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The Serrurier truss solves the problem of optical tube flexure by supporting the primary and secondary mirrors with two sets of opposing trusses mounted before and after the center support ring. The trusses are designed to have an equal amount of flexure, which allows the optics to stay on a common optical axis. When flexing, the \"top\" truss resists tension and the \"bottom\" truss resists compression. This has the effect of keeping the optical elements parallel to each other. The net result is that the optical elements stay in collimation regardless of the orientation of the telescope, including when passing through the meridian during imaging.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The truss tubes are made of a light weight\/high strength woven carbon fiber-reinforced composite material with extremely low thermal expansion characteristics. This reduces the possibility of temperature-related focus changes that can occur with steel or aluminum optical tube scopes during extreme temperature swings.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The Astro-Tech AT16RCT is 45.5\" (1156mm) long without focuser. The supplied focuser adds 5.25\" (133mm) with the drawtube retracted. The center and rear truss tube support rings are 22.5\" (572mm) in diameter, while the front support ring is 19.75\" (502mm) in diameter. The AT16RCT weighs 77 lbs (35 kg) without focuser. The supplied focuser adds 2.2 lbs (1 kg).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003e3\" Crayford focuser:\u003c\/strong\u003e The AT16RCT is supplied with a basic light duty 3\" Crayford focuser to get you started imaging. While acceptable for casual imaging with a light imaging train (such as a light DSLR body by itself), upgrading to a high quality rack-and-pinion focuser is required for serious imaging with an optical tube of this quality. A heavy multi-component imaging train will require a rack-and-pinion focuser to support the extra weight without focus shift. Alternatively, you may already have a premium focuser being used on another scope that you would like to use for imaging.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The supplied light-duty Crayford focuser can be unthreaded from the focuser attachment collar, allowing you to use another focuser. One popular choice is the dual-speed 3\" diameter 1.5\" travel Feather Touch #3015 rack and pinion focuser, available from your Astro-Tech dealer.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The newly designed focuser attachment collar is bolted to the back plate of the AT16RCT, completely independent of the primary mirror and baffle tube. This allows it to be collimated separately from the primary and secondary mirrors if needed, using the built-in focuser collimating ring. The focuser attachment collar has a male 117m x 1mm pitch thread for attaching the focuser. The Feather Touch #3015 normally comes with a 109mm threaded collar for connecting to a scope. Using the #3015 with the AT16RCT therefore requires an optional #M117x1 Feather Touch adapter. The #M117x1 adapter threads onto the focuser attachment port. The #3015 focuser (without its 109mm collar) then slips into the #M117x1 adapter and is held in place by three large brass Delrin-tipped retaining knobs. Only focusers with a maximum 1.5\" drawtube travel, such as the Feather Touch #3015, are recommended for use with the 16\" Astro-Tech AT16RCT Ritchey-Chrétien. For other focusers, such as a MoonLite, contact the focuser manufacturer for an adapter to fit the 117mm x 1mm port on the rear of the scope.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eBack focus:\u003c\/strong\u003e To fine-tune the 288mm usable back focus of the AT16RCT to the requirements of your camera and equipment train, three threaded extension rings (one 2\" and two 1\" in length) are provided to thread singly or in combination between the focuser attachment collar and the focuser of your choice. These rings provide a flex-free solid metal extension that changes the distance between your chosen focuser and the rear cell. This lets you accommodate the varying back-focus requirements of DSLR-type camera imaging versus long equipment train CCD imaging. The 2\" threaded ring weighs 14.4 ounces, the 1\" rings weigh 7.2 ounces each.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eMount requirements:\u003c\/strong\u003e Because of the 77 pound (35 kg) weight of the AT16RCT, plus the weight of your focuser, ancillary camera equipment, and any photoguide scope, installing the AT16RCT on a German equatorial mount with a 90 to 100 pound minimum payload capacity (preferably greater) is recommended. Such mounts include the Losmandy 100 pound capacity Losmandy HGM Titan; the 220 pound capacity Astro-Physics 1600GTO; and the 90 pound Software Bisque Paramount MX or 240 pound capacity Paramount ME II. Other suitable mounts are also available.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eCooling fans:\u003c\/strong\u003e To allow the AT16RCT to reach ambient temperatures more quickly for optimum imaging performance, there are three low vibration\/high CFM primary mirror cooling fans built into the AT16RCT's rear support truss\/back plate. The high speed DC fans are powered by a standard equipment battery pack that plugs into a 5mm female jack in the back plate. The battery pack uses eight user-supplied AA batteries. An optional external DC power supply, such as a rechargeable 12VDC battery pack can also be used to power the fans.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eTwo dovetail mounting rails:\u003c\/strong\u003e Two 16.2\" (412mm) Losmandy-style \"D-plate\" dovetail rails are bolted to the top and bottom of the center and rear truss-tube support rings. These allow you to install the AT16RCT directly on an equatorial mount and mount optional accessories (such as rings for a photoguide scope) that attach to a scope by means of Losmandy-style \"D-plate\" dovetail adapters. The undersides of the dovetails have been hollowed out to lighten their weight without compromising their strength.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eOther accessories:\u003c\/strong\u003e This new version of the AT16RCT includes slip-on dust covers for both the primary and secondary mirrors. Also included is a mounting shoe for a red dot-type finder, such as the Astro-Tech ATF. The mounting shoe can also accept the Astro-Tech ATF50QRB 50mm finderscope quick release bracket.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eTech Details: \u003c\/span\u003e\u003c\/h2\u003e\n\u003ctable style=\"max-width: 500px;\" id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e16\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e3250mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e77 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.29 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eTelescope Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eRitchey-Chrétien\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e15.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eBack Focus\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e11.33\" (288mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40481974616137,"sku":"AT16RCT","price":7295.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/20090.jpg?v=1675378989"},{"product_id":"sky-watcher-esprit-80mm-f-5-ed-apochromatic-triplet-refractor-with-field-flattener","title":"Sky-Watcher Esprit 80mm f\/5 ED Apochromatic Triplet Refractor With Field Flattener S11400","description":"\u003cp\u003eThe compact Sky-Watcher Esprit 80mm ED apochromatic triplet refractor has the premium high contrast\/high resolution optical performance you need to let you use it as the heart of your observing and wide field imaging system.\u003c\/p\u003e\n\u003cdiv class=\"heading\"\u003e\u003cstrong\u003eThis fast focal ratio Sky-Watcher Esprit 80mm ED triplet apochromatic refractor has:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e• 80mm f\/5 apochromatic triplet optics using ED glass\u003cbr\u003e• thread-on glass doublet field flattener\u003cbr\u003e• rotatable dual-speed 2.7\" rack and pinion focuser\u003cbr\u003e• 2\" star diagonal with 99% reflectivity dielectric mirror coatings\u003cbr\u003e• M48 camera adapter\u003cbr\u003e• 8 x 50mm right-angle correct-image finderscope\u003cbr\u003e• tube rings with a Vixen-style dovetail for installing on a German equatorial mount\u003cbr\u003e• aluminum clad foam-lined hard case\u003cbr\u003e• two-year warranty\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003eThe Sky-Watcher Esprit 80mm apochromatic triplet uses a lens of extra-low dispersion (ED) glass, flanked by two carefully chosen mating lenses of premium optical glass. The trio delivers crisp, high-fidelity wide-field images of celestial objects. The views are unmarred by the faint but annoying halo of unfocused violet light (chromatic aberration) often seen around bright stars and solar system objects in other large aperture fast focal ratio doublet and triplet refractors.\u003c\/p\u003e\n\u003cp\u003eThe 80mm Sky-Watcher Esprit triplet utilizes the most modern optical glasses and fabricating techniques to deliver the ultimate in small aperture high-fidelity astronomical observing and imaging. Each lens element is individually inspected for purity and absence of striations and other image-degrading imperfections. Each element is then pitch polished to exacting standards of optical fabrication and performance by highly skilled opticians and tested on an optical laser bench to rigidly controlled optical standards. The result is a high-quality, diffraction-limited optical system performing to the theoretical limits of its aperture - one that will give you years of imaging and visual observing satisfaction.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures of this Sky-Watcher refractor . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApochromatic ED triplet refractor optics:\u003c\/strong\u003e 80mm (3.15\") aperture, 400mm focal length, f\/5 focal ratio. The optics use two mating elements of premium optical glass. The ED element is precision-polished from high grade ED (Extra-low Dispersion) glass.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFully multicoated optics:\u003c\/strong\u003e Each air-to-glass surface in the Sky-Watcher Esprit 80mm triplet objective lens has high transmission antireflection multicoatings on all air-to-glass surfaces for high light transmission, minimal light scatter, and excellent contrast.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFixed Dewshield:\u003c\/strong\u003e Because of the very short length of the Sky-Watcher Esprit 80mm (only 17.4\" including the dew shield), the dewshield is fixed and does not have to be retracted to fit the scope into its carrying case. The dew shield slows the formation of dew on the lens in cold weather to extend your undisturbed observing time. It also improves the contrast, similar to the effect of the lens shade on a camera lens, when observing during the day or when there is excessive ambient light at night, such as a neighbor's backyard security light.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThread-on doublet field flattener:\u003c\/strong\u003e When you are ready for imaging, the Esprit 80mm includes a doublet field flattening lens that can be threaded onto the optical tube to transform your scope into an exceptional wide-field imaging Instrument. Using optical grade glass and multicoatings on all air-to-glass lens surfaces, the field flattener provides sharp, in-focus stars across a large fully-illuminated 33mm image circle that is ideal for most APS-C sensor size DSLR cameras and for CCD cameras using the popular Kodak 8300 sensor. Back focus is 75mm. A Canon EOS camera adapter (the most popular DSLR camera brand for astronomical imaging) is standard equipment. Optional Celestron M48 camera adapters are available for Nikon and Sony\/Minolta Maxxum cameras.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDual speed 2.7\" rack and pinion focuser:\u003c\/strong\u003e The precision-made and mechanically ultra-smooth, backlash-free, rack and pinion focuser has a giant 2.7\" diameter drawtube with a 2\" accessory adapter. This rotatable focuser offers dual-speed focusing and has an engraved focusing scale. There are two coarse focusing knobs. The right knob has a smaller concentric knob with 10:1 reduction gear microfine focusing over the full 60mm focuser travel. This provides exceptionally precise image control during high magnification visual observing and critical DSLR or CCD imaging. The large focus knobs have ribbed gripping surfaces so they are easy to operate, even while wearing gloves or mittens in cold weather. A lock knob lets you adjust the tension on the drawtube to accommodate varying eyepiece\/photo accessory loads, as well as firmly lock in a photographic focus.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e2\" dielectric star diagonal:\u003c\/strong\u003e The supplied standard equipment 2\" mirror star diagonal of the Esprit 80mm slips into the focuser drawtube's 2\" eyepiece\/accessory holder. The 2\" compression ring diagonal has 99% reflectivity dielectric mirror coatings for high light transmission. A 1.25\" compression ring accessory adapter is included.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFinderscope:\u003c\/strong\u003e The Sky-Watcher Esprit 80mm comes with a 9 x 50mm right-angle correct-image finderscope that is fully multicoated to insure maximum brightness and contrast. The finder shows the star field in its correct upright and right-reading orientation, as it appears to the naked eye and on star charts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMounting rings and dovetail:\u003c\/strong\u003e The Sky-Watcher Esprit 80mm apo has dual hinged split-ring tube rings to hold the 4.875\" diameter aluminum optical tube and a Vixen-style dovetail that fits directly into the dovetail slot on the head of many of the most popular medium capacity German equatorial mounts, such as the Celestron Advanced VX and CGEM.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShipping\/storage case:\u003c\/strong\u003e The scope comes in foam-fitted aluminum-clad shipping\/storage case.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTwo-year warranty:\u003c\/strong\u003e The Sky-Watcher Esprit 80mm triplet apo is protected by a two-year limited warranty against flaws in materials and workmanship.\u003c\/p\u003e\n\u003cp\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/5WNeHM2lqDU\" frameborder=\"0\" allow=\"autoplay; encrypted-media\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e \u003c\/p\u003e\n\u003cdiv\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/PBTvvjEgTos\" frameborder=\"0\" allow=\"autoplay; encrypted-media\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ctable class=\"table\" id=\"product-attribute-specs-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e80mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e400mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e133x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e8.8 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical Coatings\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eFully multicoated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1.45 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSupplied Eyepiece\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eRefractor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eView Finder\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e8x50mm Erect Image RA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e12.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBack Focus\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e75mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eS11400\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e050234114004\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical Info\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eED Triplet Refractor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eBK7 (2)\/FPL-53(ED)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e80\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eF\/Ratio\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length (mm)\u003c\/td\u003e\n\u003ctd\u003e400\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eObservational Info\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDawes Limit\u003c\/td\u003e\n\u003ctd\u003e1.45\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRayleigh Limit\u003c\/td\u003e\n\u003ctd\u003e1.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Mag.\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Magnification\u003c\/td\u003e\n\u003ctd\u003e11\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Magnification\u003c\/td\u003e\n\u003ctd\u003e157\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eGeneral Info\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2.7\" Dual Speed R\u0026amp;P\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Length (Retract\/Ext.)\u003c\/td\u003e\n\u003ctd\u003e17.4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e4.875\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight (with accessories)\u003c\/td\u003e\n\u003ctd\u003e8.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eAccessories\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Finder\u003c\/td\u003e\n\u003ctd\u003e8x50 RACI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Diagonal\u003c\/td\u003e\n\u003ctd\u003e2\" Dielectric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Accessories\u003c\/td\u003e\n\u003ctd\u003eV-Rail Foot\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Eyepieces\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Case\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrector\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":40481974812745,"sku":"S11400","price":1399.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/RS1377_S11400_Esprit80_OTAOnly_RightFront_NoBackground-scr_1800x1800_746a8f20-2b16-4706-a44c-027977246f7a.webp?v=1723134733"},{"product_id":"astro-tech-12-f-8-truss-tube-ritchey-chretien-optical-tube","title":"Astro-Tech 12\" f\/8 Truss Tube Ritchey-Chrétien Optical Tube","description":"\u003cdiv\u003eThis newest Version A of the Astro-Tech AT12RCT carbon fiber Serrurier truss Ritchey-Chrétien \u003cstrong\u003e\u003cem\u003e\u003cspan style=\"color: #990000;\"\u003eHot Product for 2015\u003c\/span\u003e\u003c\/em\u003e\u003c\/strong\u003e makes high quality large-aperture\/large format DSLR and CCD imaging affordable for the dedicated amateur astrophotographer and educational institution.\u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThis newest Version A of the Astro-Tech AT12RCT Ritchey-Chrétien astrograph (named a Sky \u0026amp; Telescope Hot Product for 2015) has:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e12\" f\/8 true Ritchey-Chrétien hyperbolic mirror optical design\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003ecarbon fiber Serrurier truss tube design with CNC-machined stainless steel and aluminum components\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003elow thermal expansion quartz primary and secondary mirrors \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e99% reflectivity non-tarnishing multi-layer dielectric mirror coatings \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003ethree built-in cooling fans in rear cell \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e3\" dual-speed Crayford focuser with 2\" and 1.25\" adapters \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003efocuser attachment collar isolated from the primary mirror and baffle tube\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003edust covers and finder shoe\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The original steel body Astro-Tech AT12RC was named a Sky \u0026amp; Telescope Hot Product for 2011. It joined the line-up of other Astro-Tech Ritchey-Chrétien scopes that have previously been honored by Sky \u0026amp; Telescope (the original Astro-Tech 6\" R-C was named a Hot product for 2009 and the Astro-Tech 8\" and 10\" R-Cs were named Hot Products for 2010). The Sky \u0026amp; Telescope Hot Product for 2015 carbon fiber truss-tube AT12RCT is the latest addition to that lineup, featuring the same high quality R-C optical system used in the award-winning 12\" steel body version.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e This newest version of the Astro-Tech AT12RCT makes 12\" coma-free true Ritchey-Chrétien imaging available to the DSLR and large format CCD astrophotographer at a price less than that of some large format CCD cameras by themselves.\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e Featuring first-quality 99% reflectivity dielectric mirror coatings and premium low thermal expansion quartz mirrors, rather than aluminized Pyrex glass mirrors, this reasonably-priced 12\" Astro-Tech truss-tube R-C provides the coma-free photographic field that large format CCD and DSLR astrophotographers crave, but can't get from conventional reflectors and Schmidt-Cassegrains.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e Likewise, as a pure two-mirror system, the AT12RCT has a wide spectral response and is totally free from the spurious color that affects the imaging of all but the most costly apochromatic refractors, and it does it with a 12\" aperture that dwarfs the light gathering of every commercially-available apo refractor.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e If serious astrophotography is your goal, but the price of true Ritchey-Chrétien optics has been keeping you from the optical design most modern professional observatories use, your wait is over. The 12\" Astro-Tech AT12RCT truss-tube R-C can bring the world of professional DSLR\/CCD deep space imaging to your backyard observatory at a truly affordable price.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eFeatures of this Astro-Tech AT12RCT Astrograph . . .\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eOptical design:\u003c\/strong\u003e true Ritchey-Chrétien Cassegrain-type two-mirror optics, with hyperbolic primary and secondary mirrors. For more details, click on the \"optics\" icon above. The 288mm available back focus (from the focuser attachment collar) allows for the use of long CCD equipment trains.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eOptical specifications:\u003c\/strong\u003e 12\" aperture, 2432mm focal length, f\/8 focal ratio. Multiple Zygo interferometer tests, during every stage of optics manufacturing (after rough figure generation, after fine figure generation, after final polish before coating, and after dielectric coating), assure premium optical performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eHyperboloid primary mirror:\u003c\/strong\u003e Made of low thermal expansion quartz. Ground and polished under precision computer control. Unlike catadioptric designs (SCTs, Maksutovs, etc.) that move the primary mirror fore and aft in the optical tube to focus (which can lead to image shift as the mirror position changes) the AT12RCT primary mirror is fixed to eliminate both a catadioptric's image shift and the frequent primary mirror collimation requirements of a Newtonian reflector. Focusing is done by means of an optional external focuser, discussed below. Primary mirror collimation is pre-set at the factory, but can be adjusted if needed using three traditional push\/pull locking adjustment screw sets.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eHyperboloid secondary mirror:\u003c\/strong\u003e Made of low thermal expansion quartz, rather than Pyrex. Ground and polished under precision computer control. Mounted in a CNC-machined four-vane spider and fully collimatable using simple standard Cassegrain reflector collimating techniques. The secondary mirror is precisely center-spotted to make collimation easier. Unlike complicated R-C designs that use motors to move the secondary mirror fore and aft to focus, the AT12RCT secondary mirror is fixed and focusing is done externally by means of an optional external focuser, discussed in the focuser section below. \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e Sky \u0026amp; Telescope said that the Astro-Tech R-C's fixed primary and secondary mirrors \"eliminate image shift, which has been the bane of Cassegrain scopes with moving-mirror focusing systems . . . It also keeps the effective focal length of the system constant, and the infinity focal point remains at a fixed point outside of the telescope, neither of which is the case with moving-mirror systems that change the separation between a Cassegrain's primary and secondary mirrors.\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eCarbon fiber truss-tube design:\u003c\/strong\u003e Three CNC-machined aluminum support rings form the basic structure of the optical tube. Light-weight and rigid carbon fiber tubes connect the support rings in a Serrurier truss design, using CNC-machined stainless steel ball and socket hardware.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The Serrurier truss solves the problem of optical tube flexure by supporting the primary and secondary mirrors with two sets of opposing trusses mounted before and after the center support ring. The trusses are designed to have an equal amount of flexure, which allows the optics to stay on a common optical axis. When flexing, the \"top\" truss resists tension and the \"bottom\" truss resists compression. This has the effect of keeping the optical elements parallel to each other. The net result is that the optical elements stay in collimation regardless of the orientation of the telescope, including passing through the meridian during imaging.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The truss tubes are made of a light weight\/high strength woven carbon fiber-reinforced composite material with extremely low thermal expansion characteristics. This reduces the possibility of temperature-related focus changes that can occur with steel or aluminum optical tube scopes during extreme temperature swings.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The Astro-Tech AT12RCT is 33-1\/8\" (841mm) long without focuser. The supplied focuser adds 5.25\" (133mm) with the drawtube retracted. The center and rear truss tube support rings are 17.25\" (438mm) in diameter, while the front support ring is 15\" (381mm) in diameter. The AT12RCT weighs 49.8 lbs (22.6 kg) without focuser. The supplied focuser adds 2.2 lbs (1 kg).\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e3\" Crayford focuser: The AT12RCT is supplied with a basic light duty 3\" Crayford focuser to get you started imaging. While acceptable for casual imaging with a light imaging train (such as a light DSLR body by itself), upgrading to a high quality rack-and-pinion focuser is required for serious imaging with an optical tube of this quality. A heavy multi-component imaging train will require a rack-and-pinion focuser to support the extra weight without focus shift. Alternatively, you may already have a premium focuser being used on another scope that you would like to use for imaging.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The supplied light-duty Crayford focuser can be unthreaded from the focuser attachment collar, allowing you to use another focuser. One popular choice is the dual-speed 3\" diameter 1.5\" travel Feather Touch #3015 rack and pinion focuser, available from your Astro-Tech dealer.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The newly designed focuser attachment collar is bolted rigidly to the back plate of the AT12RCT, completely independent of the primary mirror and baffle tube. This allows it to be collimated separately from the primary and secondary mirrors if needed, using the built-in focuser collimating ring. The focuser attachment collar has a male 117m x 1mm pitch thread for attaching the focuser.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The Feather Touch #3015 normally comes with a 109mm threaded collar for connecting to a scope. Using the #3015 with the AT12RCT therefore requires an optional #M117x1 Feather Touch adapter. The #M117x1 adapter threads onto the focuser attachment port. The #3015 focuser (without its 109mm collar) then slips into the #M117x1 adapter and is held in place by three large brass Delrin-tipped retaining knobs. Only focusers with a maximum 1.5\" drawtube travel, such as the Feather Touch #3015, are recommended for use with the 12\" Astro-Tech AT12RCT Ritchey-Chrétien. For other focusers, such as a MoonLite, contact the focuser manufacturer for an adapter to fit the 117mm x 1mm port on the rear of the scope.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e To fine-tune the 288mm back focus of the AT12RCT to the requirements of your camera and equipment train, three threaded extension rings (one 2\" and two 1\" in length) are provided to thread singly or in combination between the 117mm port on the AT12RCT rear cell and the focuser of your choice. These provide a flex-free solid metal extension that changes the distance between your chosen focuser and the rear cell. This lets you accommodate the varying back-focus requirements of DSLR-type camera imaging versus long equipment train CCD imaging. The 2\" threaded ring weighs 14.4 ounces, the 1\" rings weigh 7.2 ounces each.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eCooling fans:\u003c\/strong\u003e To allow the AT12RCT to reach ambient temperatures more quickly for optimum imaging performance, there are three small low vibration\/high CFM primary mirror cooling fans built into the rear cell. The high speed DC fans are powered by a standard equipment battery pack that plugs into a jack on the rear cell. The battery pack uses eight user-supplied AA batteries. An optional external DC power supply, such as a rechargeable 12VDC battery pack can also be used to power the fans.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eTwo dovetail mounting rails:\u003c\/strong\u003e Two 14\" Losmandy-style \"D-plate\" dovetail rails are bolted to the top and bottom of the center and rear truss-tube support rings. These allow you to install the AT12RCT directly on an equatorial mount and mount optional accessories (such as rings for a photoguide scope that attach to a scope by means of Losmandy-style \"D-plate\" dovetail adapters. The undersides of the dovetails have been hollowed out to lighten their weight without compromising their strength.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eOther accessories:\u003c\/strong\u003e This new Version A of the AT12RCT includes slip-on dust covers for both the primary and secondary mirrors. Also included is a mounting shoe for a red dot-type finder, such as the Astro-Tech ATF. The mounting shoe can also accept the Astro-Tech ATF50QRB 50mm finderscope quick release bracket.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eTech Details: \u003c\/span\u003e\u003c\/h2\u003e\n\u003ctable style=\"max-width: 500px;\" id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e12\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2432mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e49.8 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e52 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.38 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eTelescope Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eRitchey-Chrétien\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eBack Focus\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e11.33 (288mm) from rear cell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40481975926857,"sku":"AT12RCT","price":4495.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/20148.jpg?v=1675379064"},{"product_id":"astro-tech-14-f-8-truss-tube-ritchey-chretien-optical-tube","title":"Astro-Tech 14\" f\/8 Truss Tube Ritchey-Chrétien Optical Tube","description":"\u003cspan style=\"font-size: 17px; line-height: 22px; font-family: tahoma, verdana, sans-serif; background-color: #ffffff;\"\u003e\u003cspan style=\"color: #17161d;\"\u003eThis new version of the \u003c\/span\u003e\u003cstrong\u003e\u003cem\u003e\u003cspan style=\"color: #990000;\"\u003eHot Product for 2015\u003c\/span\u003e\u003c\/em\u003e\u003c\/strong\u003e\u003cspan style=\"color: #17161d;\"\u003e Astro-Tech AT14RCT carbon fiber truss Ritchey-Chrétien makes high quality DSLR and CCD imaging affordable for the dedicated amateur astrophotographer and educational institution.\u003c\/span\u003e\u003c\/span\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThis newest Version A of the Astro-Tech AT14RCT Ritchey-Chrétien astrograph (named a Sky \u0026amp; Telescope Hot Product for 2015) has:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e14\" f\/8 true Ritchey-Chrétien hyperbolic mirror optical design\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003ecarbon fiber Serrurier truss tube design with CNC-machined stainless steel and aluminum components\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003elow thermal expansion quartz primary and secondary mirrors \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003ethree built-in cooling fans in rear cell \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e3\" dual-speed compression ring Crayford focuser with 2\" and 1.25\" adapters \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003efocuser attachment collar isolated from the primary mirror and baffle tube\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003edust covers and finder shoe\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e \"Overall I'm very impressed with the AT14RCT. It's a great scope for visual observing as well as deep-sky photography. The lack of a field flattener limits its use with the largest CCDs, but that's not a handicap for anyone working with smaller detectors up to and including any of the highly popular KAF-8300-based cameras. And when you factor in the scope's cost, it's an outstanding value. It's a winner!\" Dennis di Cicco, in a 4-page review in the July 2016 Sky and Telescope.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThis newest version of the Astro-Tech AT14RCT makes 14\" coma-free true Ritchey-Chrétien imaging available to the DSLR and large format CCD astrophotographer at a price less than that of some large format CCD cameras by themselves. \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e Featuring first-quality premium low thermal expansion quartz mirrors, rather than aluminized Pyrex glass mirrors, this reasonably-priced 14\" Astro-Tech truss-tube R-C provides the coma-free photographic field that large format CCD and DSLR astrophotographers crave, but can't get from conventional reflectors and Schmidt-Cassegrains.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e Likewise, as a pure two-mirror system, the AT14RCT has a wide spectral response and is totally free from the spurious color that affects the imaging of all but the most costly apochromatic refractors, and it does it with a 14\" aperture that dwarfs the light gathering of every commercially-available apo refractor.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e If serious astrophotography is your goal, but the price of true Ritchey-Chrétien optics has been keeping you from the optical design most modern professional observatories use, your wait is over. The 14\" Astro-Tech AT14RCT truss-tube R-C can bring the world of professional DSLR\/CCD deep space imaging to your backyard observatory at a truly affordable price.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eFeatures of this Astro-Tech AT14RCT Ritchey-Chrétien . . .\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eOptical design:\u003c\/strong\u003e True Ritchey-Chrétien Cassegrain-type two-mirror optics, with hyperbolic primary and secondary mirrors. The 288mm usable back focus (from the end of the focuser attachment port) allows for the use of long CCD equipment trains.\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eOptical specifications: 14\" aperture, 2850mm focal length, f\/8 focal ratio. Multiple Zygo interferometer tests, during every stage of optics manufacturing (after rough figure generation, after fine figure generation, after final polish before coating, and after dielectric coating), assure premium optical performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eHyperboloid primary mirror:\u003c\/strong\u003e Made of low thermal expansion quartz. Ground and polished under precision computer control. Unlike catadioptric designs (SCTs, Maksutovs, etc.) that move the primary mirror fore and aft in the optical tube to focus (which can lead to image shift and a changing focal length and focal ratio as the mirror position changes) the AT14RCT's non-moving primary mirror is supported by a multi-point floatation system. Primary mirror collimation is pre-set at the factory, but can be adjusted if needed using three heavy-duty spring-loaded push\/pull locking adjustment screw sets.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eHyperboloid secondary mirror:\u003c\/strong\u003e Made of low thermal expansion quartz, rather than Pyrex. Ground and polished under precision computer control. Mounted in a CNC-machined four-vane spider and fully collimatable using standard Cassegrain reflector collimating techniques. The secondary mirror is precisely center-spotted to make collimation easier.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e Unlike complicated R-C designs that use motors to move the secondary mirror fore and aft to focus, the AT14RCT secondary mirror is fixed and focusing is done externally by means of an optional external focuser, discussed in the focuser section below. \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e Sky \u0026amp; Telescope said that the Astro-Tech R-C's fixed primary and secondary mirrors \"eliminate image shift, which has been the bane of Cassegrain scopes with moving-mirror focusing systems . . . It also keeps the effective focal length of the system constant, and the infinity focal point remains at a fixed point outside of the telescope, neither of which is the case with moving-mirror systems that change the separation between a Cassegrain's primary and secondary mirrors.\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The secondary mirror's baffle obstruction is 6.5\" (166mm) in diameter (46.6% by diameter and 21.7% by area of the 14\" primary.)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eCarbon fiber truss-tube design:\u003c\/strong\u003e Four CNC-machined aluminum support rings form the basic structure of the optical tube. Light-weight and rigid carbon fiber tubes connect the support rings in a Serrurier truss design, using CNC-machined stainless steel ball and socket hardware. The middle and rear support rings have a hexagonal outer shape, measuring 20.5\" (521mm) across at their widest point. They are 10mm thick. The dual front support rings provide attachment points for the secondary mirror spider vanes, as well as for the truss tubes. They measure 17.75\" (451mm) across at their widest point of their hexagonal outer shape and are 5mm thick. The AT14RCT measures only 33\" long (1156mm) from the front support ring to the end of the focuser mounting collar, and weighs 65 pounds (29.5kg) without focuser.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The Serrurier truss solves the problem of optical tube flexure by supporting the primary and secondary mirrors with two sets of opposing trusses mounted before and after the center support ring. The trusses are designed to have an equal amount of flexure, which allows the optics to stay on a common optical axis. When flexing, the \"top\" truss resists tension and the \"bottom\" truss resists compression. This has the effect of keeping the optical elements parallel to each other. The net result is that the optical elements stay in collimation regardless of the orientation of the telescope, including when passing through the meridian during imaging.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The truss tubes are made of a light weight\/high strength woven carbon fiber-reinforced composite material with extremely low thermal expansion characteristics. This reduces the possibility of temperature-related focus changes that can occur with steel or aluminum optical tube scopes during extreme temperature swings.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The Astro-Tech AT14RCT is 39\" (991mm) long without focuser. The supplied focuser adds 5.25\" (133mm) with the drawtube retracted. The center and rear truss tube support rings are 19\" (483mm) in diameter, while the front support ring is 16.5\" (419mm) in diameter. The AT14RCT weighs 65 lbs (29.5 kg) without focuser. The supplied focuser adds 2.2 lbs (1 kg).\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e3\" Crayford focuser: The AT14RCT is supplied with a basic light duty 3\" Crayford focuser to get you started imaging. While acceptable for casual imaging with a light imaging train (such as a light DSLR body by itself), upgrading to a high quality rack-and-pinion focuser is required for serious imaging with an optical tube of this quality. A heavy multi-component imaging train will require a rack-and-pinion focuser to support the extra weight without focus shift. Alternatively, you may already have a premium focuser being used on another scope that you would like to use for imaging.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The supplied light-duty Crayford focuser can be unthreaded from the focuser attachment collar, allowing you to use another focuser. One popular choice is the dual-speed 3\" diameter 1.5\" travel Feather Touch #3015 rack and pinion focuser, available from your Astro-Tech dealer.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The newly designed focuser attachment collar is bolted rigidly to the back plate of the AT14RCT, completely independent of the primary mirror and baffle tube. This allows it to be collimated separately from the primary and secondary mirrors if needed, using the built-in focuser collimating ring. The focuser attachment collar has a male 117m x 1mm pitch thread for attaching the focuser.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The Feather Touch #3015 normally comes with a 109mm threaded collar for connecting to a scope. Using the #3015 with the AT14RCT therefore requires an optional #M117x1 Feather Touch adapter. The #M117x1 adapter threads onto the focuser attachment port. The #3015 focuser (without its 109mm collar) then slips into the #M117x1 adapter and is held in place by three large brass Delrin-tipped retaining knobs. Only focusers with a maximum 1.5\" drawtube travel, such as the Feather Touch #3015, are recommended for use with the 14\" Astro-Tech AT14RCT Ritchey-Chrétien. For other focusers, such as a MoonLite, contact the focuser manufacturer for an adapter to fit the 117mm x 1mm port on the rear of the scope.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eBack focus:\u003c\/strong\u003e To fine-tune the 288mm usable back focus of the AT14RCT to the requirements of your camera and equipment train, three threaded extension rings (one 2\" and two 1\" in length) are provided to thread singly or in combination between the focuser attachment collar and the focuser of your choice. These rings provide a flex-free solid metal extension that changes the distance between your chosen focuser and the rear cell. This lets you accommodate the varying back-focus requirements of DSLR-type camera imaging versus long equipment train CCD imaging. The 2\" threaded ring weighs 14.4 ounces, the 1\" rings weigh 7.2 ounces each.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eMount requirements:\u003c\/strong\u003e Because of the 65 pound (29.5 kg) weight of the AT14RCT, plus the weight of your focuser, ancillary camera equipment, and any photoguide scope, installing the AT14RCT on a German equatorial mount with a 90 to 100 pound minimum payload capacity is recommended. Such mounts include the Losmandy 100 pound capacity Losmandy HGM Titan; the 220 pound capacity Astro-Physics 1600GTO; and the 90 pound Software Bisque Paramount MX or 240 pound capacity Paramount ME II. Other suitable mounts are also available.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eCooling fans:\u003c\/strong\u003e To allow the AT14RCT to reach ambient temperatures more quickly for optimum imaging performance, there are three low vibration\/high CFM primary mirror cooling fans built into the AT14RCT's rear support truss\/back plate. The high speed DC fans are powered by a standard equipment battery pack that plugs into a 5mm female jack in the back plate. The battery pack uses eight user-supplied AA batteries. An optional external DC power supply, such as a rechargeable 12VDC battery pack can also be used to power the fans.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eTwo dovetail mounting rails:\u003c\/strong\u003e Two 15.5\" (394mm) Losmandy-style \"D-plate\" dovetail rails are bolted to the top and bottom of the center and rear truss-tube support rings. These allow you to install the AT14RCT directly on an equatorial mount and mount optional accessories (such as rings for a photoguide scope) that attach to a scope by means of Losmandy-style \"D-plate\" dovetail adapters. The undersides of the dovetails have been hollowed out to lighten their weight without compromising their strength.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eOther accessories:\u003c\/strong\u003e This new Version A of the AT14RCT includes slip-on dust covers for both the primary and secondary mirrors. Also included is a mounting shoe for a red dot-type finder, such as the Astro-Tech ATF. The mounting shoe can also accept the Astro-Tech ATF50QRB 50mm finderscope quick release bracket.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eTech Details: \u003c\/span\u003e\u003c\/h2\u003e\n\u003ctable style=\"max-width: 500px;\" id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e14\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2850mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e65 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e65 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eTelescope Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eRitchey-Chrétien\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eBack Focus\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e288mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40481976778825,"sku":"AT14RCT","price":6049.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/20181.jpg?v=1675379108"},{"product_id":"astro-tech-at80edt-f-6-ed-triplet-refractor-ota","title":"Astro-Tech AT80EDT f\/6 ED Triplet Refractor OTA","description":"\u003cp\u003eFor the backyard grab-and-go observer, for the Milky Way star field scanner, for the wide field imager, for the birder and terrestrial photographer the Astro-Tech AT80EDT 80mm f\/6 ED triplet apo is the Swiss Army knife of refractors.\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e\n\u003cp\u003eIn 2024 we looked at the landscape of refractors and decided that somethings might need some improvements.  Optically the Astro-Tech EDT still provided what astronomers have come to love about our refractors...performance and value.  We just felt that some mechanical upgrades would be a welcome addition to them.  For the 80EDT it meant visiting the focuser, rings, and internal baffles.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Astro-Tech AT80EDT has:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e80mm f\/6 fully multicoated triplet apochromatic optics using an FK-61 ED center element \u003c\/li\u003e\n\u003cli\u003ea dual-speed 2.8\" CNC rotatable rack-and-pinion focuser with 10:1 ratio fine focuser \u003c\/li\u003e\n\u003cli\u003ean upgraded camera angle adjuster\u003c\/li\u003e\n\u003cli\u003edurable nylon soft carry case \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eretractable lens shade\/dew shield\u003c\/li\u003e\n\u003cli\u003edual hinged split tube rings\u003c\/li\u003e\n\u003cli\u003e a Vixen-style dovetail\u003c\/li\u003e\n\u003cli\u003edual vixen finder shoes on the focuser body\u003c\/li\u003e\n\u003cli\u003ea top mounted handle\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor grab-and-go observing, Milky Way star field sweeping, and wide field astrophotography (as well an terrestrial observing and photography), many observers swear by a good fast focal ratio 80mm refractor. The 6.5 pound 80mm f\/6 Astro-Tech AT80EDT ED triplet apo refractor is just that scope. It does it all.\u003c\/p\u003e\n\u003cp\u003eThe Astro-Tech AT80EDT's slow-polished triplet optics, FK-61 ED glass center element, and state-of-the-art optical multicoatings are even more impressive when you consider the package they come in. The finely-machined scope has a dual-speed 2.8\" rack-and-pinion focuser with a microfine 10:1 fine-focusing ratio. A built-in camera angle adjuster lets you fine-tune the composition of your astrophotos and the orientation of your equipment. The supplied 2\" and 1.25\" eyepiece holders use non-marring compression rings that won't scratch your eyepiece barrels. It even comes with a finder shoe, tube rings, and a dovetail plate.\u003c\/p\u003e\n\u003cp\u003eThis feature-laden 80mm Astro-Tech AT80EDT ED triplet apochromatic refractor offers exceptional optical and mechanical performance and features at a very reasonable price. It will do just about anything you want to do with a truly portable scope. Let it into your telescope family and you may never want to let it go.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures of this Telescope . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eED apochromatic triplet refractor optics: \u003c\/strong\u003e80mm (3.15\") aperture, 480mm focal length, f\/6 focal ratio. It uses an ED (Extra-low Dispersion glass) center element to reduce spurious color halos and fringing to vanishingly low levels. All three lens elements are slow-polished for smooth surfaces, with less scattered light.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFully multicoated optics: \u003c\/strong\u003eThe triplet objective lens has the latest state-of-the-art antireflection multicoatings on all air-to-glass surfaces for high light transmission and excellent contrast. This can easily be seen by looking into the objective lens of the scope. Virtually no reflection of your face will be seen. It's a sure sign that the high transmission coatings are doing their job, by letting virtually all the light enter the scope, rather than reflecting some light back to your eye.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInternal light baffles:\u003c\/strong\u003e Contrast-enhancing knife-edge light baffles in the 90mm diameter optical tube provide truly dark sky backgrounds and high terrestrial contrast. The edges of the lenses are blackened to reduce internal reflections and further improve image contrast.  When we went with the new 2.8\" CNC focuser in late 2024 we improved the baffle design as well.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDew shield:\u003c\/strong\u003e A self-storing retractable dew shield slows the formation of dew on the lens in cold weather to extend your undisturbed observing time. It also improves the contrast, similar to the effect of the lens shade on a camera lens, when observing during the day or when there is excessive ambient light at night, such as from a neighbor's backyard security light.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDual speed 2.8\" rotating rack-and-pinion focuser:\u003c\/strong\u003e The precision-made CNC focuser has dual-speed focusing. There are two coarse focusing knobs. The right knob also has a smaller concentric knob with a 10:1 reduction gear microfine focusing ratio. This provides exceptionally precise image control during high magnification visual observing and critical CCD imaging.\u003c\/p\u003e\n\u003cp\u003eThe focus knobs have ribbed gripping surfaces so they are easy to operate, even while wearing gloves or mittens in cold weather. The focuser drawtube has 75mm of travel and a millimeter scale on the drawtube to let you return to an approximate focus when switching between visual and photographic setups. A lock knob under the focuser lets you lock in your photographic focus.\u003c\/p\u003e\n\u003cp\u003eThe focuser also comes with two vixen style finder shoes attached to the focuser body as standard equipment.  This will allow you to mount a vixen finder bracket or any accessory that uses a vixen style finder bracket.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCompression ring eyepiece holders:\u003c\/strong\u003e The focuser's 2.5\" drawtube terminates in a 2\" eyepiece holder that uses a non-marring compression ring to hold the standard equipment 2\" star diagonal and\/or accessories in place. The compression ring won't scratch the barrel of your star diagonal and accessories as an ordinary thumbscrew can.\u003c\/p\u003e\n\u003cp\u003eA supplied 1.25\" accessory adapter slips into the 2\" eyepiece holder to let you use a 1.25\" star diagonal, image erecting diagonal, or photographic accessories. Like the 2\" eyepiece holder, the 1.25\" adapter also uses a non-marring compression ring to hold 1.25\" star diagonals and accessories in place.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBuilt-in camera angle adjuster:\u003c\/strong\u003e The focuser drawtube's 2\" eyepiece\/accessory holder includes a built-in camera angle adjuster that lets you quickly adjust the angle of your camera for the best composition or to put the star diagonal at the most comfortable observing angle. A knob on the 2\" eyepiece\/accessory holder lets you unlock the camera angle adjuster, rotate it to the desired final angle, then lock it in place at whatever angle is most convenient for you. This camera angle adjuster is standard equipment, not an optional extra-cost accessory, as it is with some other scopes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOptical tube:\u003c\/strong\u003e The very compact 15\" long optical tube and focuser (17\" long with lens shade extended) are finished in a durable white finish, with grey trim. There is a finderscope mounting shoe that accepts Vixen-style finderscope mounting brackets. The shoe can be mounted on either the top left or top right side of the focuser body. A slip-on metal dust cap is standard, as is a dust seal for the eyepiece holder.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTube rings and dovetail:\u003c\/strong\u003e Dual split hinged tube rings are supplied for the 90mm o. d. optical tube. The rings are lined with white felt that will not stain the white finish of the scope over time, unlike the black felt supplied with other scopes. A 5.4\" long Vixen-style dovetail is bolted to the tube rings. Optional Losmandy-style D-plate dovetails are available if your mount uses a wider Losmandy-style saddle.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCarry handle:  \u003c\/strong\u003eThe AT80EDT also comes with a top mounted carry handle to make mounting and moving your telescope a breeze. The handle will also allow vixen style DVAs to mount to it so accessories can be added directly to the top.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable style=\"max-width: 500px;\" id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e80mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003e\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e480mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003e\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e160x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003e\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e5.5 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003e\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1.45 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eTelescope Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eRefractor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40481978318921,"sku":"AT80EDT","price":999.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/AT80EDT_1-9533.jpg?v=1731697622"},{"product_id":"sky-watcher-8-quattro-200p-imaging-newtonian","title":"Sky-Watcher 8\" Quattro 200P Imaging Newtonian S11210","description":"\u003cp\u003eIf you are an astro-photographer looking for a fast optical system at a fantastic price then the Quattro series is for you.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe Sky-Watcher 8\" f\/4 Quattro Imaging Newtonian has . . . \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e205mm aperture\/800mm focal length f\/4 Newtonian reflector optics\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFully multi-coated borosilicate mirrors\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e2” 10:1 ratio dual-speed focuser\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e8x50 finderscope\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTube rings with V-style dovetail bar\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 8\" Sky-Watcher Quattro Imaging Newtonian with dual-speed focuser is optimized for wide-field deep space imaging, but can also be used for pleasing visual observing. It incorporates a superbly-figured multi-coated borosilicate optical glass mirror-set. Additionally, the tube length has been slightly shortened to optimize performance for wide-field prime-focus photography. Even better field edge performance for astrophotography, and visual use, can be achieved by adding the Sky-Watcher Quattro coma corrector.\u003c\/p\u003e\n\u003cp\u003eThis Sky-Watcher 8\" Quattro imaging Newtonian is ultra-fast and incredibly simple to use. The f\/4 optical system allows the user to capture wide field images of faint deep space objects such as nebulae, open clusters, and galaxies over six times faster than using an f\/10 system. This gives you the ability to acquire more images in less time. The Newtonian optical design is one of the most basic, and therefore trouble-free, systems available to astrophotographers.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e800mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e21 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical Coatings\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSupplied Eyepiece\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eReflector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eView Finder\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e8x50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eS11210\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e050234112109\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical Info\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eNewtonian\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Coatings\u003c\/td\u003e\n\u003ctd\u003eRadiant Aluminum Quartz (RAQ)™ coatings with 94% reflectivity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eBorosilicate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e203\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eF\/Ratio\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length (mm)\u003c\/td\u003e\n\u003ctd\u003e800\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Diameter\u003c\/td\u003e\n\u003ctd\u003e70mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Obstruction (by diameter)\u003c\/td\u003e\n\u003ctd\u003e34%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Obstruction by Area\u003c\/td\u003e\n\u003ctd\u003e12%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eObservational Info\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDawes Limit\u003c\/td\u003e\n\u003ctd\u003e0.57\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRayleigh Limit\u003c\/td\u003e\n\u003ctd\u003e0.69\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Mag.\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Magnification\u003c\/td\u003e\n\u003ctd\u003e29\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Magnification\u003c\/td\u003e\n\u003ctd\u003e400\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering (compared to next size down)\u003c\/td\u003e\n\u003ctd\u003e78%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eGeneral Info\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2\" Dual Speed Crayford\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Length (Retract\/Ext.)\u003c\/td\u003e\n\u003ctd\u003e28\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e9.375\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight (with accessories)\u003c\/td\u003e\n\u003ctd\u003e21\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eAccessories\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Finder\u003c\/td\u003e\n\u003ctd\u003e9x50 Finder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Diagonal\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Accessories\u003c\/td\u003e\n\u003ctd\u003eRings\/V-Rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Eyepieces\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Case\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrector\u003c\/td\u003e\n\u003ctd\u003eNo (optional)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eSupplied Accessories: \u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003e8x50 Finder Tube Rings with Vixen style dovetail bar\u003c\/span\u003e\u003c\/p\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":40481978515529,"sku":"S11210","price":925.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/Quattro200_Main_1800x1800_e11f0b29-27fe-4124-950f-05518f253e41.webp?v=1723064986"},{"product_id":"sky-watcher-10-quattro-250p-imaging-newtonian","title":"Sky-Watcher 10\" Quattro 250P Imaging Newtonian S11220","description":"\u003cp\u003eIf you are looking for a large fast optical system to enhance your astro-photography then the Quattro series from Sky-Watcher should fit the bill.\u003c\/p\u003e\n\u003cdiv class=\"heading\"\u003e\u003cstrong\u003eThe Sky-Watcher 10\" f\/4 Quattro Imaging Newtonian has . . .\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e\n\u003cul\u003e\n\u003cli\u003e254mm aperture\/1000mm focal length f\/4 Newtonian reflector optics\u003c\/li\u003e\n\u003cli\u003eFully multi-coated borosilicate mirrors\u003c\/li\u003e\n\u003cli\u003e2” 10:1 ratio dual-speed focuser\u003c\/li\u003e\n\u003cli\u003e8x50 finderscope\u003c\/li\u003e\n\u003cli\u003eTube rings with V-style dovetail bar\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003eThe Sky-Watcher 10\" Quattro Imaging Newtonian with dual-speed focuser is optimized for wide-field deep space imaging, but can also be used for pleasing visual observing. It incorporates a superbly-figured multi-coated borosilicate optical glass mirror-set. Additionally, the tube length has been slightly shortened to optimize performance for wide-field prime-focus photography. Even better field edge performance for deep space astrophotography, and visual use, can be achieved by adding the Sky-Watcher Quattro coma corrector.\u003c\/p\u003e\n\u003cp\u003eThis Sky-Watcher 10\" Quattro imaging Newtonian is ultra-fast and incredibly simple to use. The f\/4 optical system allows the user to capture wide field images of faint deep space objects such as nebulae, open clusters, and galaxies over six times faster than using an f\/10 system. This gives you the ability to acquire more images in less time. The Newtonian optical design is one of the most basic, and therefore trouble free, systems available to astrophotographers.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable class=\"table\" id=\"product-attribute-specs-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e10\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1000mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e33 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e33 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical Coatings\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSupplied Eyepiece\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eReflector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eView Finder\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e8x50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":40481978548297,"sku":"S11220","price":1325.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/Quattro250_Main_1800x1800_374f5147-26b3-4e03-9d8c-23ffc275ad68.webp?v=1723057008"},{"product_id":"sky-watcher-12-quattro-300p-imaging-newtonian","title":"Sky-Watcher 12\" Quattro 300P Imaging Newtonian S11230","description":"\u003cp\u003eThe Sky-Watcher 12\" Quattro will bring your imaging into the next level.\u003c\/p\u003e\n\u003cdiv class=\"heading\"\u003e\u003cstrong\u003eThe Sky-Watcher 12\" f\/4 Quattro Imaging Newtonian has . . .\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e\n\u003cul\u003e\n\u003cli\u003e305mm aperture\/1200mm focal length f\/4 Newtonian reflector optics\u003c\/li\u003e\n\u003cli\u003eFully multi-coated borosilicate mirrors\u003c\/li\u003e\n\u003cli\u003e3” 10:1 ratio dual-speed focuser\u003c\/li\u003e\n\u003cli\u003e8x50 finderscope\u003c\/li\u003e\n\u003cli\u003eTube rings with D-style dovetail bar\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003eThe new 12\" f\/4 Sky-Watcher Quattro Imaging Newtonian with 3\" dual-speed focuser has the light-gathering needed for serious wide-field deep space imaging of very faint deep space objects, but can also be used for pleasing visual observing. It incorporates a superbly-figured multi-coated borosilicate optical glass mirror-set. Additionally, the tube length has been slightly shortened to optimize performance for wide-field prime-focus photography. Even better field edge performance for astrophotography, and visual use, can be achieved by adding the Sky-Watcher Quattro coma corrector.\u003c\/p\u003e\n\u003cp\u003eThis Sky-Watcher 12\" Quattro imaging Newtonian is ultra-fast and incredibly simple to use. The 12\" f\/4 optical system allows the user to capture wide field images of very faint deep space objects such as nebulae, open clusters, and galaxies over six times faster than using an f\/10 system. This gives you the ability to acquire more images in less time. The Newtonian optical design is one of the most basic, and therefore trouble free, systems available to astrophotographers.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable class=\"table\" id=\"product-attribute-specs-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e12\" (305mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1200mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e54 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e57 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical Coatings\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSupplied Eyepiece\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eReflector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eView Finder\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e8x50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eS11230\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e050234112307\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical Info\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eNewtonian\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Coatings\u003c\/td\u003e\n\u003ctd\u003eRadiant Aluminum Quartz (RAQ)™ coatings with 94% reflectivity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eBorosilicate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e305\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Edge Thickness\u003c\/td\u003e\n\u003ctd\u003e38mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eF\/Ratio\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length (mm)\u003c\/td\u003e\n\u003ctd\u003e1200\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Diameter\u003c\/td\u003e\n\u003ctd\u003e102mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Obstruction (by diameter)\u003c\/td\u003e\n\u003ctd\u003e33%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Obstruction by Area\u003c\/td\u003e\n\u003ctd\u003e11%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eObservational Info\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDawes Limit\u003c\/td\u003e\n\u003ctd\u003e0.38\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRayleigh Limit\u003c\/td\u003e\n\u003ctd\u003e0.46\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Mag.\u003c\/td\u003e\n\u003ctd\u003e14.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Magnification\u003c\/td\u003e\n\u003ctd\u003e43\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Magnification\u003c\/td\u003e\n\u003ctd\u003e600\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering (compared to next size down)\u003c\/td\u003e\n\u003ctd\u003e44%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eGeneral Info\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2\" Dual Speed Crayford\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Length (Retract\/Ext.)\u003c\/td\u003e\n\u003ctd\u003e42.5\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e14.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight (with accessories)\u003c\/td\u003e\n\u003ctd\u003e57\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eAccessories\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Finder\u003c\/td\u003e\n\u003ctd\u003e9x50 Finder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Diagonal\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Accessories\u003c\/td\u003e\n\u003ctd\u003eRings\/D-Rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Eyepieces\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Case\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrector\u003c\/td\u003e\n\u003ctd\u003eNo (optional)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":40481978581065,"sku":"S11230","price":1995.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/Quattro300_Main_1800x1800_4a2f8327-1cb8-434e-a9d8-5a7dff53dfde.webp?v=1723059067"},{"product_id":"astro-tech-10-f-4-carbon-fiber-truss-tube-imaging-newtonian","title":"Astro-Tech 10\" f\/4 Carbon Fiber Truss-Tube Imaging Newtonian","description":"\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif;\"\u003eFor serious deep space astrophotographers, this Sky \u0026amp; Telescope 2016 Hot Product 10\" Astro-Tech AT10INT carbon fiber truss tube imaging Newtonian may be all the scope you will ever need.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThis \u003cspan style=\"color: #ff0000;\"\u003eSky \u0026amp; Telescope Hot Product for 2016\u003c\/span\u003e Astro-Tech 10\" Truss-Tube Imaging Newtonian has:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eVery fast f\/4 focal ratio 10\" Newtonian reflector optics\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eCarbon fiber truss tube design \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e2\" dual-speed linear bearing Crayford focuser with 2\" and 1.25\" compression ring accessory adapters \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThree built-in cooling fans for faster primary mirror cooldown \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e8 x 50mm finderscope in a quick-release bracket \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eTwo Losmandy-style D-plate dovetails\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis \u003cspan style=\"color: #ff0000;\"\u003eSky \u0026amp; Telescope 2016 Hot Product\u003c\/span\u003e 10\" Astro-Tech AT10INT carbon fiber truss tube optical tube is a very fast focal ratio f\/4 reflector that has been optimized for wide field imaging of faint deep space objects. It can be used with DSLRs and large format CCD cameras.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eIn addition to deep space imaging, the Astro-Tech AT10INT is also usable for solar system imaging as well as deep space and solar system visual observing. As the AT10INT's large secondary mirror has been optimized for full-field photographic illumination, solar system visual contrast will be somewhat reduced compared to a longer f\/ratio reflector with a smaller secondary.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eVisually, the scope should probably be considered more of a deep space \"light bucket,\" rather than a solar system scope. However, the visual performance within the solar system will still be much more than acceptable, and the 1016mm focal length of this 10\" Astro-Tech makes it quite possible to achieve the high powers needed for detailed lunar and planetary observing. Simply add optional 1.25\" or 2\" eyepieces, and perhaps an optional Barlow lens, and this Astro-Tech Imaging Newtonian will provide you with crisp and sharply detailed close-up views of the Moon and planets.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThis Astro-Tech AT10INT 10\" Imaging Newtonian has . . .\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eNewtonian reflector optics:\u003c\/strong\u003e 10\" aperture, 1016mm focal length, f\/4 focal ratio. Parabolic primary mirror, with press-fit dust cover. Both primary and diagonal mirrors are ground and polished under computer control for guaranteed diffraction limited performance. They are coated with 96% reflectivity enhanced aluminum, and overcoated with a protective layer of silicon dioxide (quartz) for long life.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eNo-tool push-pull mirror cell:\u003c\/strong\u003e The die-cast aluminum primary mirror cell has six recessed push-pull collimation screws. The recessed screw design holds the mirror collimation more securely than exposed knobs that can be moved inadvertently.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eThree built-in cooling fans:\u003c\/strong\u003e Three small low-vibration fans are mounted on the primary mirror cell. The fans are powered by a supplied battery pack that uses eight user-supplied AA batteries. Alternatively, the fan can be powered by a 12 VDC rechargeable battery if one is being used to power your mount's drive system.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eCarbon fiber truss-tube body:\u003c\/strong\u003e The 32.25\" long Astro-Tech AT10INT optical tube uses carbon fiber truss tubes and CNC-machined stainless steel and aluminum hardware. Both the primary and diagonal mirrors have built-in light shields on the inside of the truss tube assembly to block ambient light.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe two front truss-tube mounting rings that form the diagonal mirror cage have a maximum diameter of 13-1\/8\". The two rings holding the carbon fiber tubes that form the primary mirror housing have a maximum diameter of 15-3\/8\". The carbon fiber truss tubes that form the primary mirror housing and connect the front and rear sections of the optical tube have a very low thermal coefficient of expansion. This keeps focus changes (due to tube contraction when the temperature drops during an exposure) to an absolute minimum.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003e2\" dual-speed linear bearing Crayford focuser:\u003c\/strong\u003e The heavy duty linear bearing Crayford focuser has a 2\" accessory holder, with a 1.25\" accessory adapter. Both have non-marring compression rings.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe focuser has dual-speed focusing. There are two coarse focusing knobs. One knob has a smaller concentric knob with a 10:1 reduction gear microfine focusing ratio. This provides exceptionally precise image control during critical imaging. All focus knobs are ribbed, so they are easy to operate, even while wearing gloves or mittens in cold weather.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eA lock knob underneath the focuser lets you adjust the tension on the drawtube to accommodate varying equipment loads. A large lock knob on top of the focuser lets you lock in your photographic focus.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe linear bearing Crayford focuser has a polished stainless steel drive rail that runs the length of the underside of the drawtube. The focuser's stainless steel drive shaft presses on this drive rail to move the focuser, rather than having the hard steel drive shaft press directly on (and wear out) the softer aluminum drawtube as with conventional Crayford focusers.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe steel drive rail rides in a self-lubricating track that extends almost the entire length of the focuser body. The drive rail and its attached drawtube are thereby supported over most of their length at all times, rather than by a conventional Crayford focuser's two sets of small contact area roller bearings. This system distributes the drive force evenly over the entire drawtube, without concentrating it on a few small contact points. The result is a very rigid drawtube with essentially zero flexure and no wear (much less flat spots or uneven wear) on the focuser drawtube.\u003c\/span\u003e\u003cbr\u003e \u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe focuser drawtube has 51mm (2\") of travel. Focusing scales on top of the focuser drawtube are marked in inches and millimeters to make it easy to return to the approximate correct focus when setting up to image or observe each night.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eFor essentially coma-free imaging with the Astro-Tech AT10INT, consider adding the Astro-Tech ATCC coma corrector to the scope. This imaging accessory essentially eliminates the coma inherent in all fast focal ratio reflector telescope designs, so that the coma-free star images remain point-like all across the field.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eTwo Losmandy-style dovetails:\u003c\/strong\u003e Two 14-5\/8\" long Losmandy-style D-plate dovetails are installed on the Astro-Tech AT10INT. One is used to mount the AT10INT on any equatorial mount of your choice that has a sufficient payload capacity to carry the 34 lb scope and any imaging accessories you might add. The second is available to mount a photoguide scope or other accessories.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eBecause of the 34 pound weight of the Astro-Tech AT10INT, plus the weight of your ancillary camera equipment and any photoguide scope, installing the AT10INT on a German equatorial mount with a 60 pound or greater payload capacity is recommended. Such mounts include the 75 pound capacity Celestron CGX-L and the Losmandy 60 pound capacity G11 or G11 go-to and 100 pound capacity Losmandy HGM Titan. Other suitable mounts are also available.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eFinderscope:\u003c\/strong\u003e 8 x 50mm straight-through dark crosshair achromatic design, in a spring-loaded quick-release mounting bracket. The finder has a long and comfortable 13mm eye relief. To focus the finder, loosen the trim ring behind the objective lens cell, screw the lens cell in or out to focus, and tighten the trim ring to lock in the correct focus.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eTech Details: \u003c\/span\u003e\u003c\/h2\u003e\n\u003ctable class=\"table\" id=\"product-attribute-specs-table\" style=\"max-width: 500px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e10\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1016mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e339x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e34 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.48 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e14.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40481979203657,"sku":"AT10INT","price":1795.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/20369.jpg?v=1675379275"},{"product_id":"astro-tech-12-f-4-carbon-fiber-truss-tube-imaging-newtonian","title":"Astro-Tech 12\" f\/4 Carbon Fiber Truss-Tube Imaging Newtonian","description":"\u003cp\u003eIf you are a serious deep space astrophotographers with a big mount, this Sky \u0026amp; Telescope 2016 Hot Product 12\" Astro-Tech AT12INT carbon fiber truss tube imaging Newtonian may be the scope of your dreams.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis \u003cem\u003e\u003cspan style=\"color: #ff0000;\"\u003eSky \u0026amp; Telescope Hot Product for 2016\u003c\/span\u003e\u003c\/em\u003e Astro-Tech 12\" Truss-Tube Imaging Newtonian has:\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eVery fast f\/4 focal ratio 12\" Newtonian reflector optics\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eCarbon fiber truss tube design \u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003e2\" dual-speed linear bearing Crayford focuser with 2\" and 1.25\" compression ring accessory adapters \u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eThree built-in cooling fans for faster primary mirror cooldown \u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003e8 x 50mm finderscope in a quick-release bracket \u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eTwo Losmandy-style D-plate dovetails\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e \u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThis \u003cem\u003e\u003cspan style=\"color: #ff0000;\"\u003eSky \u0026amp; Telescope 2016 Hot Product\u003c\/span\u003e\u003c\/em\u003e 12\" Astro-Tech AT12INT carbon fiber truss tube optical tube is a very fast focal ratio f\/4 reflector that has been optimized for wide field imaging of faint deep space objects. It can be used with DSLRs and large format CCD cameras.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eIn addition to deep space imaging, the Astro-Tech AT12INT is also usable for solar system imaging as well as deep space and solar system visual observing. As the AT12INT's large secondary mirror has been optimized for full-field photographic illumination, solar system visual contrast will be somewhat reduced compared to a longer f\/ratio reflector with a smaller secondary. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eVisually, the scope should probably be considered more of a deep space \"light bucket,\" rather than a solar system scope. However, the visual performance within the solar system will still be much more than acceptable, and the 1016mm focal length of this 10\" Astro-Tech makes it quite possible to achieve the high powers needed for detailed lunar and planetary observing. Simply add optional 1.25\" or 2\" eyepieces, and perhaps an optional Barlow lens, and this Astro-Tech Imaging Newtonian will provide you with crisp and sharply detailed close-up views of the Moon and planets.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eThis Astro-Tech AT12INT 12\" Imaging Newtonian has . . .\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eNewtonian reflector optics:\u003c\/strong\u003e 12\" aperture, 1220mm focal length, f\/4 focal ratio. Parabolic primary mirror, with press-fit dust cover. Both primary and diagonal mirrors are ground and polished under computer control for guaranteed diffraction limited performance. They are coated with 96% reflectivity enhanced aluminum, and overcoated with a protective layer of silicon dioxide (quartz) for long life.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eNo-tool push-pull mirror cell:\u003c\/strong\u003e The die-cast aluminum primary mirror cell has six recessed push-pull collimation screws. The recessed screw design holds the mirror collimation more securely than exposed knobs that can be moved inadvertently.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eThree built-in cooling fans:\u003c\/strong\u003e Three small low-vibration fans are mounted on the primary mirror cell. The fans are powered by a supplied battery pack that uses eight user-supplied AA batteries. Alternatively, the fan can be powered by a 12 VDC rechargeable battery if one is being used to power your mount's drive system.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eCarbon fiber truss-tube body:\u003c\/strong\u003e The 39.5\" long Astro-Tech AT12INT optical tube uses carbon fiber truss tubes and CNC-machined stainless steel and aluminum hardware. Both the primary and diagonal mirrors have built-in light shields on the inside of the truss tube assembly to block ambient light.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe two front truss-tube mounting rings that form the diagonal mirror cage have a maximum diameter of 15.75\". The two rings holding the carbon fiber tubes that form the primary mirror housing have a maximum diameter of 19.25\". The carbon fiber truss tubes that form the primary mirror housing and connect the front and rear sections of the optical tube have a very low thermal coefficient of expansion. This keeps focus changes (due to tube contraction when the temperature drops during an exposure) to an absolute minimum.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003e2\" dual-speed linear bearing Crayford focuser:\u003c\/strong\u003e The heavy duty linear bearing Crayford focuser has a 2\" accessory holder, with a 1.25\" accessory adapter. Both have non-marring compression rings.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe focuser has dual-speed focusing. There are two coarse focusing knobs. One knob has a smaller concentric knob with a 10:1 reduction gear microfine focusing ratio. This provides exceptionally precise image control during critical imaging. All focus knobs are ribbed, so they are easy to operate, even while wearing gloves or mittens in cold weather.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eA lock knob underneath the focuser lets you adjust the tension on the drawtube to accommodate varying equipment loads. A large lock knob on top of the focuser lets you lock in your photographic focus.\u003c\/span\u003e\u003cbr\u003e \u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe linear bearing Crayford focuser has a polished stainless steel drive rail that runs the length of the underside of the drawtube. The focuser's stainless steel drive shaft presses on this drive rail to move the focuser, rather than having the hard steel drive shaft press directly on (and wear out) the softer aluminum drawtube as with conventional Crayford focusers.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe steel drive rail rides in a self-lubricating track that extends almost the entire length of the focuser body. The drive rail and its attached drawtube are thereby supported over most of their length at all times, rather than by a conventional Crayford focuser's two sets of small contact area roller bearings. This system distributes the drive force evenly over the entire drawtube, without concentrating it on a few small contact points. The result is a very rigid drawtube with essentially zero flexure and no wear (much less flat spots or uneven wear) on the focuser drawtube.\u003c\/span\u003e\u003cbr\u003e \u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe focuser drawtube has 51mm (2\") of travel. Focusing scales on top of the focuser drawtube are marked in inches and millimeters to make it easy to return to the approximate correct focus when setting up to image or observe each night. \u003c\/span\u003e\u003cbr\u003e \u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eFor essentially coma-free imaging with the AT12INT, consider adding the Astro-Tech ATCC coma corrector to the scope. This imaging accessory essentially eliminates the coma inherent in all fast focal ratio reflector telescope designs, so that the coma-free star images remain point-like all across the field.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eTwo Losmandy-style dovetails:\u003c\/strong\u003e Two 17-5\/16\" long Losmandy-style D-plate dovetails are installed on the AT12INT. One is used to mount the AT12INT on any equatorial mount of your choice that has a sufficient payload capacity to carry the 34 lb scope and any imaging accessories you might add. The second is available to mount a photoguide scope or other accessories.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eBecause of the 51 pound weight of the AT12INT, plus the weight of your ancillary camera equipment and any photoguide scope, installing the AT12INT on a German equatorial mount with a 90 pound or greater payload capacity is recommended. Such mounts include the 100 pound capacity Losmandy HGM Titan. Other suitable mounts are also available.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eFinderscope:\u003c\/strong\u003e 8 x 50mm straight-through dark crosshair achromatic design, in a spring-loaded quick-release mounting bracket. The finder has a long and comfortable 13mm eye relief. To focus the finder, loosen the trim ring behind the objective lens cell, screw the lens cell in or out to focus, and tighten the trim ring to lock in the correct focus.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eTech Details: \u003c\/span\u003e\u003c\/h2\u003e\n\u003ctable style=\"max-width: 500px;\" id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e12\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1220mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e407x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e51 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.38 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e14.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40481979269193,"sku":"AT12INT","price":2195.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/20370.jpg?v=1675379277"},{"product_id":"celestron-cgx-equatorial-1100-rowe-ackermann-schmidt-astrograph-rasa-telescope-12059","title":"Celestron CGX Equatorial 1100 Rowe-Ackermann Schmidt Astrograph RASA Telescope 12059","description":"Eyepieces need not apply. This astrograph is designed to work only with your camera.\n\n\u003cp\u003eThe Celestron CGX Equatorial 1100 Rowe-Ackermann Schmidt Astrograph (RASA) updates and improves the Celestron Schmidt camera, a premium wide-field imaging instrument of the 1970s that had a loyal following, but a difficult instrument to use that only a really hard-core 35mm film astrophotographer could love.\u003cbr\u003e \u003cbr\u003eToday, fast DSLR and CCD electronic imaging has taken the place of slow 35mm film. Home computers can manipulate and improve DSLR and CCD images in ways that 35mm imagers could only dream of. DSLRs and CCD cameras can have sensors as large as (and in some cases larger than) 35mm film.\u003c\/p\u003e\n\u003cp\u003eTo compensate for these new large sensors Celestron had to push the boundaries of the Schmidt camera design and make an entirely new type of instrument, the RASA. The Celestron RASA provides an advance in the performance of deep space imaging scopes that lets today's amateur astrophotographers produce wide field results rivaling those of the best professional observatory photos of only a few short years ago.\u003c\/p\u003e\n\u003cp\u003eThe 11\" 620mm focal length f\/2.22 Celestron Rowe-Ackermann Schmidt Astrograph imaging-only optical tube has a huge 70mm image circle that can handle full frame DSLRs and the largest sensor size CCD cameras with minimal vignetting. It combines a proven Schmidt corrector optical system with a built-in 4-element rare earth corrector lens that keeps the images free of coma, field curvature, and false color. The optical quality and spot size across the entire image circle are unprecedented for an astrograph in this price range - or even that of a much more expensive instrument.\u003cbr\u003e \u003cbr\u003eIts fast, wide field, f\/2.22 optics give you two huge advantages over traditional f\/10 catadioptric imaging scopes (even those using an optional f\/6.3 or f\/7 focal reducer). You get better apparent tracking due to the image scale, plus shorter exposure times due to the speed of the optics. That means you can create better-looking deep space images and mosaics in a fraction of the time it used to take, even without using an autoguider.\u003c\/p\u003e\n\u003cp\u003eWith a Rayleigh Limit (photographic resolution) of 0.50 arc seconds, the Celestron 11\" RASA is capable of revealing much finer deep space detail than a similar focal length 4\" apo refractor (a scope type often used for wide field imaging), which has a Rayleigh Limit of 1.36 arc seconds. And the RASA will record those more detailed images in a fraction the time of that 4\" apo.\u003c\/p\u003e\n\u003cp\u003eThe Celestron 11\" RASA optical tube includes a custom-engineered linear brass focuser bearing to reduce image shift It is combined with a FeatherTouch Micro Focus Knob to allow you to make the precise fine adjustments you need to capture the perfect image. Mirror locks hold your precise focus. A quiet high-output 12V internal MagLev fan on the rear cell reduces cooldown time and provides optimal airflow through the dust filtered 33\" long optical tube.\u003c\/p\u003e\n\u003cp\u003eOf course industry leading StarBright XLT optical multicoatings are standard for the highest possible light throughput. 42mm T-thread DSLR and 48mm CCD camera adapters are standard equipment. Two Losmandy-style \"D-plate\" dovetails are standard, one on the bottom of the RASA for installing it on the CGEM DX mount, and one on top for installing accessories (such as on optional photoguide scope). The back focus from the included camera adapters is 55mm.\u003c\/p\u003e\n\u003cp\u003eNaturally, an astrograph as good as the RASA demands an equally good mount. The Celestron CGX is that mount.\u003c\/p\u003e\n\u003cp\u003eThe Celestron CGX is culmination of years of engineering by the USA R \u0026amp; D division of Celestron. The CGX isn't just a pretty face, the mechanics and ergonomics are upgraded as well. Celestron has taken their equatorial mounts to a higher level than ever before.\u003c\/p\u003e\n\u003cp\u003eThe new CGX looks like a cross between the CGEM II and the CGE Pro mount from Celestron. The ergonomically-designed CGX has a fresh, attractive, bold appearance and easier set-up of than earlier EQ mounts. It has been uprated with mechanical and electronic changes to a 55 pound payload capacity. The new design allows for a lower profile EQ head with a better balance point. Celestron has also added a integrated handles to assist with setup and transportation.\u003c\/p\u003e\n\u003cp\u003eThe CGX mount head contains dual-axis slewing\/tracking motors on each axis for go-to computer control. This is where the real upgrades start. The mount uses spring-loaded worm gears with belt drives. The belt drives offer smooth, quiet operation and precision slewing and tracking. The motor armatures are skewed to minimize cogging for precise jitter-free low speed tracking. The motor drives and their wiring are all internal, keeping them snag-free and free from dust and debris.\u003c\/p\u003e\n\u003cp\u003eRedesigned electronics deliver constant regulated power to the motors, making them capable of driving the telescope even when the mount is not perfectly balanced. This allows the CGX to have the payload capacity of much larger mounts without sacrificing smooth tracking motion and pointing accuracy across the entire sky. The mount of course supports the SkyPortal WiFi (for your smart devices) as well as the StarSense AutoAlign putting cutting edge control and setup at your disposal.\u003c\/p\u003e\n\u003cp\u003eThe mount requires a minimum 3.5 amp 12 VDC power supply to operate. The maximum 3.5 amp power draw happens only briefly when accelerating to the high speed slewing mode from a standing start, or decelerating from the high speed mode when approaching a computer-chosen object. Normal power draw with a well-balanced payload is generally less than half the maximum draw.\u003c\/p\u003e\n\u003cp\u003eThe mount comes with a car battery cord to operate from the cigarette lighter plug of your car or from a rechargeable 12V battery pack. The 17 amp hour capacity Celestron Power Tank #4517V is recommended and will operate the mount all night long without danger of running out of power.\u003c\/p\u003e\n\u003cp\u003eTo make a casual polar alignment for visual use quick and easy, there's a latitude scale with large ergonomically-friendly altitude and azimuth adjustment knobs. No polar alignment finderscope is available to aid in the precise polar alignment required for long exposure astrophotography, nor is any needed. A unique Celestron All-Star Polar Alignment program built into the NexStar hand control helps you do a very precise computerized polar alignment in mere minutes, using any bright star, even when Polaris is hidden by trees or buildings. It works in both northern and southern hemispheres. This technology basically gets rid of the need for a polar alignment scope.\u003c\/p\u003e\n\u003cp\u003eThe supplied 17 pound counterweight is locked in place with a single hand-tighten knob, making it easy to rebalance a scope if you add heavy photographic accessories. If needed, optional counterweights are available to balance very heavy loads.\u003c\/p\u003e\n\u003cp\u003eFor observing or imaging objects near the meridian (the imaginary line passing directly overhead from North to South), the CGX is designed to track 20° past the meridian for uninterrupted imaging through the most ideal part of the sky.\u003c\/p\u003e\n\u003cp\u003eThere are nine motor drive speeds: 0.5x and 1x sidereal for guiding; 4x, 8x, 16x, and 64x for centering; and 1°, 2°, and a fast 5° per second for slewing. Preset tracking rates include sidereal, solar, and lunar. Equatorial tracking modes are available for both northern and southern hemispheres.\u003c\/p\u003e\n\u003cp\u003eNew for the CGX mount is a telescope control software that has been developed in conjunction with Planewave Instruments. Planewave Instruments produces some of the most sophisticated imaging systems on the planet. The features of the included software are extremely robust. They include multi-point goto modeling, focusing, and plate solving. You will no longer need a third party advanced PC control software as this has it all.\u003c\/p\u003e\n\u003cp\u003eThe supplied NexStar computer hand control has a built-in database of more than 40,000 stars and objects. These include the complete RNGC, Messier, Caldwell, IC, and Abell catalogs; selected SAO stars; the planets, the Moon, and others. The custom database lists of all the most famous deep-sky objects by name and catalog number; the most beautiful double, triple and quadruple stars; selected variable stars; non-planetary solar system objects; and asterisms.\u003c\/p\u003e\n\u003cp\u003eYou can also store and edit the right ascension and declination of 100 additional user-defined objects of your own choosing, such as the comet and asteroid coordinates published monthly in Astronomy and Sky \u0026amp; Telescope magazines. The computer control can find any of those objects with only a few keystrokes, and track them with high accuracy for visual or photographic applications. There is enhanced information on over 200 of the most note-worthy objects.\u003c\/p\u003e\n\u003cp\u003eThe NexStar computer control of the smooth and precise CGX go-to mount makes finding over 40,000 stars and objects easy and automatic, so you can spend more time looking at them, rather than looking for them.\u003c\/p\u003e\n\u003cp\u003eAll of the database and mount operation information is displayed on a double line, 16-character, liquid crystal display on the hand control. There are 19 fiber optic backlit LED buttons to make it easy for you to control the NexStar computer without affecting your dark-adapted vision. A USB 2.0 communication port on the hand control allows you to operate the telescope via a personal computer using a USB cable and NexRemote software CD-ROM.\u003c\/p\u003e\n\u003cp\u003eThe NexStar hand control provides a constant digital r. a. and dec readout of the scope's position on the sky. This provides much greater accuracy than conventional manual setting circles for star-hopping or locating objects by their celestial coordinates alone, should you want to observe the old-fashioned way without using the computer to find objects for you.\u003c\/p\u003e\n\u003cp\u003eThe software built into the NexStar hand control includes mount calibration, database filter limits, hibernate, five alignment procedures, user-defined slew limits, a new \"All-Star\" polar alignment routine that uses any bright star for a quick and accurate polar alignment, and more. Built-in adjustable backlash compensation permits precise corrections during astrophotography and when observing visually at high powers. A high precision pointing subroutine in the computer lets you point accurately at objects that you want to photograph that are too dim to be seen though the scope.\u003c\/p\u003e\n\u003cp\u003eThe software includes permanent programmable periodic error correction (PEC) to correct for the minor periodic tracking errors inherent to all worm drives that might otherwise mar your long exposure photographs. The CGX mount retains the PEC recordings when it is powered down. The hand control and motor control software is flash-upgradeable to allow you to download the latest product updates over the Internet to keep your CGX mount always at the cutting edge of technology.\u003c\/p\u003e\n\u003cp\u003eAn autoguider port is located on the electronic pier for long exposure astrophotography. The autoguider port can use a six-pin RJ-12 modular jack ST-4 compatible CCD autoguider to automatically control the drive motors during long exposure astrophotography.\u003c\/p\u003e\n\u003cp\u003eFive different alignment methods are built into the Celestron mount's NexStar computer - 2-star align, quick align, 1-star align, last alignment, and solar system align. This allows you to choose a level of computer accuracy in automatically finding objects with which you are comfortable. Alignment is easily accomplished in only a few short minutes. You can be observing in less than 15 minutes after you first take your CGX-mounted scope outdoors.\u003c\/p\u003e\n\u003cp\u003eIn addition, the NexStar computer hand control is GPS-compatible (using an optional inexpensive SkySync GPS module) for full GPS (Global Positioning System) accuracy. Adding GPS to the computer is something no competitively-priced mount can do. Once the scope is approximately polar aligned, the 16-channel SkySync GPS system uses signals from government satellites to calculate the scope's location on earth with an accuracy measured in meters. The system also calculates the current time based on the split second accuracy of the GPS time signals.\u003c\/p\u003e\n\u003cp\u003eAfter the SkySync quickly completes these calculations and enters the information into the computer control for you automatically, the computer then orients the scope with the sky, slews to a pair of guide stars, asks you to confirm that the stars are in the center of the field (and center them if they're not precisely aligned), and then starts finding and tracking over 40,000 objects for you at your command. With the CGX go-to mount and the SkySync, orienting your scope in time and space on earth and aligning it on the sky becomes almost as easy a task as simply turning the mount on.\u003c\/p\u003e\n\u003cp\u003eThe new, 2\"diameter adjustable height tripod has graduated markings on the legs to help with quick leveling. The center leg brace is drilled to form a convenient accessory tray that holds 1.25\" and 2\" eyepieces to keep them up out of the dew-soaked grass.\u003c\/p\u003e\n\u003cp\u003eOptical tubes are installed on the CGX mount using a Dual-Slot on the mount head that accepts a Celestron CGE-style or Losmandy D-plate dovetail slide bar as well as the narrower Vixen Style dovetail. This allows the optical tube to be quickly and precisely balanced fore and aft on the mount, eliminating the need for an extra counterweight to balance a camera or other accessories. Setup and takedown times are exceptionally fast, as a single large hand-tighten knob holds the optical tube in place. A second lock knob prevents the tube from sliding off the mount should the hand-tighten knob loosen.\u003c\/p\u003e\n\u003ch2\u003eTech Details: \u003c\/h2\u003e\n\u003ctable id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e11\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e620mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/2.22\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMotorized Controls\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eCopmputerized Go-To\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e143 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical Coatings\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eStarBright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.41 Arc Seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40481980743753,"sku":"CRA-CGX","price":5999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/12059_cgx_11_rasa_kit_1.jpg?v=1675379356"},{"product_id":"celestron-cgem-ii-700-7-maksutov-cassegrain-telescope","title":"Celestron CGEM II 700 7\" Maksutov-Cassegrain Telescope","description":"\u003cp\u003e700 Maksutov-Cassegrain telescope with f\/15 focal ratio provides high contrast views of the planets and lunar landscapes, perfect for serious planetary imagers and visual observers.\u003c\/p\u003e\n\u003cp\u003eCelestron’s premium StarBright XLT coatings ensure maximum light transmission.\u003c\/p\u003e\n\u003cp\u003eThe CGEM II, with its 40 lbs load capacity, is the latest update to the venerable CGEM mount and provides a sturdy and rigid platform.\u003c\/p\u003e\n\u003cp\u003eThe drive system, consisting of low cog DC Servo motors with integrated optical encoders, steel worm gears supported by precision sealed bearings, and brass worm wheels, ensures smooth and accurate slewing and tracking.\u003c\/p\u003e\n\u003cp\u003eThe 700 Maksutov-Cassegrain CGEM II telescope (CGEM II 700 Mak) is a specialized instrument designed for detailed, high contrast views of smaller celestial objects like the planets. With the Maksutov-Cassegrain optical tube and sturdy equatorial mount and tripod, this kit will provide unparalleled views of the planets and up-close views of the lunar surface, including craters and maria, Maks are also well suited to hunting smaller, fainter, deep sky objects such as globular clusters and planetary nebulae. Astronomers located in urban astronomers will appreciate the Mak’s ability to bring out more contrast in celestial objects. Transporting the entire system to a dark site is not a problem either. The optical tube, mount head, tripod, counterweight bar, and counterweight all disassemble, with no tools required, into separate manageable pieces.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMaksutov-Cassegrain Optical Design\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Mak is a catadioptric telescope, which means the optical design includes both a lens and a mirror. The light coming through a Mak passes through the corrector lens to the primary mirror and back to a spherical secondary mirror before it hits your eyepiece. Images are bright, sharp, and virtually free of chromatic aberration.\u003c\/p\u003e\n\u003cp\u003eThe Maksutov-Cassegrain’s optical design offers several unique benefits. Instead of a secondary mirror, the Mak features a “secondary spot” of reflective coating applied directly to the inside of the corrector plate. Because of this, the telescope does not require frequent collimation like a Schmidt-Cassegrain. Also, the secondary spot is significantly smaller than a traditional Schmidt-Cassegrain secondary mirror, giving the Mak its signature high-contrast views.\u003c\/p\u003e\n\u003cp\u003eOne important thing to note about Maksutov-Cassegrain telescopes is that the larger, heavier Maksutov corrector plate takes longer to cool down and adjust to ambient air temperature compared to a Schmidt-Cassegrain of the same aperture.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCGEM II Mount \u0026amp; Tripod\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Celestron CGEM II is an upgraded heavy-duty computerized go-to German equatorial moun. The ergonomically-designed CGEM II has a fresh, attractive, bold appearance – and a 40 pound payload capacity. This allows it to carry Celestron SCT optical tubes up to 11\" in aperture, plus a full load of imaging accessories, as well as virtually any other optical tube and accessory payload less than 40 pounds in weight.\u003c\/p\u003e\n\u003cp\u003eThe CGEM II mount head contains dual-axis slewing\/tracking motors on each axis for go-to computer control. Steel worm gears and 90mm diameter brass worm wheels assure long-term reliability and high accuracy performance. The use of low cog DC Servo motors with integrated optical positioning encoders offers smooth, quiet operation and precision slewing and tracking. The motor armatures are skewed to minimize cogging for precise jitter-free low speed tracking. The motor drives and their wiring are all internal, keeping them snag-free and free from dust and debris.\u003c\/p\u003e\n\u003cp\u003eThe mount requires a minimum 1.5 amp 12 VDC power supply to operate. The maximum 1.5 amp power draw happens only briefly when accelerating to, or decelerating from, the high speed slewing mode from a standing start with a small payload (8\" SCT OTA or similar). Normal power draw with a well-balanced payload is generally less than half the maximum draw.\u003c\/p\u003e\n\u003cp\u003eThe mount comes with a car battery cord to operate from the cigarette lighter plug of your car or from a rechargeable 12V battery pack. The 17 amp hour capacity Celestron Power Tank #4517V is recommended and will operate the mount all night long without danger of running out of power. An optional Celestron #2338PRO 5 amp ac adapter is available to run the CGEM II all night from household AC in backyard or observatory.\u003c\/p\u003e\n\u003cp\u003eTo make a casual polar alignment for visual use quick and easy, there's a latitude scale with large ergonomically-friendly altitude and azimuth adjustment knobs. No polar alignment finderscope is available to aid in the precise polar alignment required for long exposure astrophotography, nor is any needed. A unique Celestron All-Star Polar Alignment program built into the NexStar hand control helps you do a very precise computerized polar alignment in mere minutes, using any bright star, even when Polaris is hidden by trees or buildings. It works in both northern and southern hemispheres.\u003c\/p\u003e\n\u003cp\u003eThe supplied 17 pound counterweight is locked in place on the steel counterweight shaft with a single hand-tighten knob, making it easy to rebalance a scope if you add heavy photographic accessories. If needed, optional counterweights are available to balance very heavy loads.\u003c\/p\u003e\n\u003cp\u003eFor observing or imaging objects near the meridian (the imaginary line passing directly overhead from North to South), the CGEM II is designed to track well past the meridian for uninterrupted imaging through the most ideal part of the sky.\u003c\/p\u003e\n\u003cp\u003eThere are nine motor drive speeds: 0.5x and 1x sidereal for guiding; 4x, 8x, 16x, and 64x for centering; and 1°, 2°, and a fast 5° per second for slewing. Preset tracking rates include sidereal, solar, and lunar. Equatorial tracking modes are available for both northern and southern hemispheres.\u003c\/p\u003e\n\u003cp\u003eThe supplied NexStar computer hand control has a built-in database of more than 40,000 stars and objects. These include the complete RNGC, Messier, Caldwell, IC, and Abell catalogs; selected SAO stars; the planets, the Moon, and others. The custom database lists of all the most famous deep-sky objects by name and catalog number; the most beautiful double, triple and quadruple stars; selected variable stars; non-planetary solar system objects; and asterisms.\u003c\/p\u003e\n\u003cp\u003eYou can also store and edit the right ascension and declination of 400 additional user-defined objects of your own choosing, such as the comet and asteroid coordinates published monthly in Astronomy and Sky \u0026amp; Telescope magazines. The computer control can find any of those objects with only a few keystrokes, and track them with high accuracy for visual or photographic applications. There is enhanced information on over 200 of the most note-worthy objects.\u003c\/p\u003e\n\u003cp\u003eThe NexStar computer control of the smooth and precise CGEM II go-to mount makes finding over 40,000 stars and objects easy and automatic, so you can spend more time looking at them, rather than looking for them.\u003c\/p\u003e\n\u003cp\u003eNew for the CGEM II mount, a USB 2.0 communication port on the hand control allows you to operate the telescope via a personal computer using a USB cable and NexRemote software CD-ROM. The hand control and motor control software is flash-upgradeable to allow you to download the latest product updates over the Internet to keep your CGEM II mount always at the cutting edge of technology. An autoguider port is located on the electronic pier for guided, but unattended, long exposure astrophotography.\u003c\/p\u003e\n\u003cp\u003eThe NexStar hand control provides a constant digital r. a. and dec readout of the scope's position on the sky. This provides much greater accuracy than conventional manual setting circles for star-hopping or locating objects by their celestial coordinates alone, should you want to observe the old-fashioned way without using the computer to find objects for you.\u003c\/p\u003e\n\u003cp\u003eThe software built into the NexStar hand control includes mount calibration, database filter limits, hibernate, five alignment procedures, user-defined slew limits, a new \"All-Star\" polar alignment routine that uses any bright star for a quick and accurate polar alignment, and more. Built-in adjustable backlash compensation permits precise corrections during astrophotography and when observing visually at high powers. A high precision pointing subroutine in the computer lets you point accurately at objects that you want to photograph that are too dim to be seen though the scope.\u003c\/p\u003e\n\u003cp\u003eThe software includes permanent programmable periodic error correction (PEC) to correct for the minor periodic tracking errors inherent to all worm drives that might otherwise mar your long exposure photographs. The CGEM II mount retains the PEC recordings when it is powered down. The hand control and motor control software is flash-upgradeable to allow you to download the latest product updates over the Internet to keep your CGEM II mount always at the cutting edge of technology.\u003c\/p\u003e\n\u003cp\u003eAn autoguider port is located on the electronic pier for long exposure astrophotography. The autoguider port can use a six-pin RJ-12 modular jack ST-4 compatible CCD autoguider to automatically control the drive motors during long exposure astrophotography.\u003c\/p\u003e\n\u003cp\u003eFive different alignment methods are built into the NexStar computer - 2-star align, quick align, 1-star align, last alignment, and solar system align - allowing you to choose a level of computer accuracy in automatically finding objects with which you are comfortable. Alignment is easily accomplished in only a few short minutes. You can be observing in less than 15 minutes after you first take your CGEM II-mounted scope outdoors.\u003c\/p\u003e\n\u003cp\u003eIn addition, the NexStar computer hand control is GPS-compatible (using an optional inexpensive SkySync GPS module) for full GPS (Global Positioning System) satellite accuracy. Adding GPS to the computer is something no competitively-priced mount can do. Once the scope is approximately polar aligned, the 16-channel SkySync GPS system uses signals from government satellites to calculate the scope's location on earth with an accuracy measured in meters. The system also calculates the current time based on the split second accuracy of the GPS time signals.\u003c\/p\u003e\n\u003cp\u003eAfter the SkySync quickly completes these calculations and enters the information into the computer control for you automatically, the computer can then orient the scope with the sky, slew to a pair of guide stars, ask you to confirm that the stars are in the center of the field (and center them if they're not precisely aligned), and then start finding and tracking over 40,000 objects for you at your command. With the CGEM II go-to mount and the SkySync, orienting your scope in time and space on earth and aligning it on the sky becomes almost as easy a task as simply turning the mount on.\u003c\/p\u003e\n\u003cp\u003eThe adjustable height tripod has 2\" diameter stainless steel legs with a metal center leg brace for rigidity to provide excellent damping characteristics. The center leg brace is drilled to form a convenient accessory tray that holds 1.25\" and 2\" eyepiece to keep them up out of the dew-soaked grass.\u003c\/p\u003e\n\u003cp\u003eNew for the CGEM II mount is a dual saddle plate. The saddle plate will now accept both the CGE\/Losmandy wide dovetail plate as well as the AVX\/Vixen style dovetail plate. The dovetail slot on the top of the mount holds the long dovetail slide bar mounted under the optical tube. This allows you to slide the optical tube fore and aft in the dovetail slot to quickly and precisely balance the optical tube in declination when you add or subtract accessories, eliminating the need for an extra counterweight to balance a camera or other accessories. Setup and takedown times are exceptionally fast, as a single large hand-tighten knob holds the optical tube in place. A second lock knob prevents the tube from sliding off the mount should the hand-tighten knob loosen. The oversized dovetail mounting platform assures secure vibration-free tube attachment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAccessories Included\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe CGEM II 700 Mak comes complete with a 2” Visual Back, a 2” Star Diagonal with 1.25” adapter, a 28 mm wide-field 2” eyepiece, and a large 8x50 straight-through finderscope. The optical tube accommodates the larger 2” accessories, such as 2” Barlow lenses, the 2” eyepiece and filter kit, and larger wide-field eyepieces.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStarBright XLT Technology\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eStarBright XLT is Celestron’s revolutionary optical coating system that outperforms any other coating in the commercial telescope market. There are three major components that make up our StarBright XLT high-transmission optical system design:\u003c\/p\u003e\n\u003cp\u003eUnique enhanced multi-layer mirror coatings made from precise layers of aluminum, SiO2 (quartz), TiO2 (titanium dioxide), and SiO2 (silicon dioxide). Reflectivity is fairly flat across the spectrum, optimizing it for both imaging and visual observing.\u003cbr\u003eMulti-layer anti-reflective coatings made from precise layers of MgF2 (magnesium fluoride) and HfO2 (hafnium dioxide). Hafnium—a rare element that costs nearly $2,000 per kilogram—gives us a wider band pass than the titanium used in competing coatings.\u003cbr\u003eHigh-transmission water white glass is used instead of soda lime glass for the corrector lens. Water white glass transmits about 90.5% without anti-reflective coatings; that’s 3.5% better transmission than uncoated soda lime glass. When water white glass is used in conjunction with StarBright XLT’s anti-reflective coatings, the average transmission reaches 97.4%, an 8% improvement.\u003c\/p\u003e\n\u003cp\u003eTaken together, these three components make StarBright XLT one of the finest optical coatings available. \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCelestron’s Starry Night Special Edition Software\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eStarry Night is a planetarium software package which provides easy-to-understand explanations and impressive visuals of all kinds of night sky phenomena. Use Starry Night to learn more about extra solar planets imagery, 3D Stars rendering, observation planning, telescope control, multiple-panel printing, and much more. Starry Night is available on macOS and Microsoft Windows. \u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable class=\"table\" id=\"product-attribute-specs-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e180mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2700mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e40 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e420x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMotorized Controls\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eComputerized GoTo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e96 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical Coatings\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eStarbright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e.52 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSupplied Eyepiece\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e28mm 2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eMaksutov-Cassegrain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eView Finder\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e8x50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e13.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eSupplied Accessories: \u003c\/h2\u003e\n\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eAccessories included: 2” Visual Back, 2” Star Diagonal with 1.25” adapter, 28mm eyepiece (2”), 8x50 finderscope\u003c\/span\u003e\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40481986019401,"sku":"CGEMII700","price":3299.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/12016_cgem-ii_700_maksutov_cassegrain_telescope_03_570x380_2x_ecc1bc10-0cda-4538-b28c-8cb851d1af3c.jpg?v=1675379715"},{"product_id":"celestron-8-rowe-ackermann-schmidt-astrograph-rasa-8","title":"Celestron 8” Rowe-Ackermann Schmidt Astrograph (RASA 8)","description":"\u003cul\u003e\n\u003cli\u003eFlat field free of optical aberrations like field curvature, coma, astigmatism and chromatic aberration across an entire APS-C sensor.\u003c\/li\u003e\n\u003cli\u003eUnlike the larger RASAs that work with DSLR and large CCD cameras, the 8” model was designed with color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras in mind. The telescope does not work with standard DSLR cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eNEW\u003c\/span\u003e Ultra-Stable Focus System – six precision sealed ball bearings virtually eliminate image shift.\u003c\/li\u003e\n\u003cli\u003eIntegrated air cooling system –12V DC MagLev fan reduces cooldown time and provides optimal air flow while filtering out dust.\u003c\/li\u003e\n\u003cli\u003eInternal filter mount – seamlessly accommodates a Light Pollution Imaging Filter into the optical path.\u003c\/li\u003e\n\u003cli\u003eCGE dovetail mounting rail.\u003c\/li\u003e\n\u003cli\u003ePerforms over a wider spectral range than most telescopes, from 390-800 nm, so more of the light passing through the astrograph is in sharp focus.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eThis Celestron 8\" f\/2 Rowe-Ackermann Schmidt Astrograph (RASA) optical tube has:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eVery fast 8\" f\/2 Rowe-Ackermann Schmidt optics \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eStarBright XLT optical multicoatings for the highest possible light transmission\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMagLev DC cooling fan and cooling vents \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBuilt-in corrector lens\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMirror locks\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e42mm T-thread and C Thread camera adapters\u003c\/li\u003e\n\u003cli\u003eCGE (Losmandy-style \"D-plate\") dovetails \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e2-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\"I don't get it. What do you look through?\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis might be the most common question people ask when you unpack your new Celestron Rowe-Ackermann Schmidt Astrograph (RASA). It's not only missing something that comes with virtually every telescope ever produced . . . an eyepiece . . . it doesn't even have a place to put an eyepiece. That's because the 400mm focal length f\/2 Celestron 8\" RASA is strictly a deep space imaging scope and cannot be used visually.\u003c\/p\u003e\n\u003cp\u003eBut what an imaging scope! It has a 22mm image circle that can handle CMOS cameras, smaller CCD cameras, and mirrorless cameras.  The telescope does not work with standard DSLR cameras. It provides a proven Schmidt corrector optical system with a built-in corrector lens that keeps the images free of coma, field curvature, and false color. The optical quality and spot size across the entire image circle are unprecedented for an astrograph in this price range - or even that of a much more expensive instrument.\u003cbr\u003e\u003cbr\u003eIts fast, wide field, f\/2 optics give you two huge advantages over traditional f\/10 catadioptric imaging scopes (even those using an optional f\/6.3 or f\/7 focal reducer). Those advantages? Better apparent tracking due to the image scale, plus shorter exposure times due to the speed of the optics. That means you can create better-looking deep space images in a fraction of the time it used to take, even without using an autoguider.\u003c\/p\u003e\n\u003cp\u003eThe Celestron RASA concept was to modernize the Celestron Schmidt camera, an instrument that had a loyal following, as its very fast focal ratio allowed amateur astrophotographers to produce wide field deep space images in the 1970s. Schmidt cameras could produce great images, but they wre and imaging scope only a really hard-core astrophotographer could love.\u003c\/p\u003e\n\u003cp\u003eThose Schmidt cameras used a single frame of 35mm film, cut from a roll of film. You flexed the chip of film in total darkness (being careful not to touch the emulsion side) to fit snugly into a curved holder that matched the camera's curved focal plane, then loaded it into the camera by feel inside a black cloth bag to avoid image-spoiling stray light. You manually guided your scope during the entire exposure, keeping your eye glued to the crosshairs of an illuminated reticle eyepiece so your stars wouldn't turn into elongated squiggles. Finally, after a sometimes multiple hour single exposure, you tediously processed the small chip of film in your own darkroom before you could even begin to see if you had captured a usable image.\u003c\/p\u003e\n\u003cp\u003eNo more. Telescope mount drive accuracy has improved tremendously, electronic eyeballs have taken over guiding, and fast digital photography has taken the place of slow 35mm film.\u003c\/p\u003e\n\u003cp\u003eToday's CCD camera can have sensors as large, if not larger, than film. To compensate for the new large sensors Celestron had to push the boundaries of the Schmidt camera design and make an entirely new type of instrument. The Celestron Rowe-Ackermann Schmidt Astrograph has provided that advance in the performance of deep space imaging scopes. With it, today's amateur astrophotographers can produce results rivaling that of the best professional observatory photos of only a few short years ago.\u003c\/p\u003e\n\u003cp\u003eAs with most advances in optics, the Celestron Rowe-Ackermann Schmidt Astrograph was designed not by committee, but by two dedicated optical experts who believed things could be done better - Dave Rowe and Mark Ackermann.\u003c\/p\u003e\n\u003cp\u003eDave Rowe - amateur astronomer, telescope maker, and optical designer - studied astronomy and astrophysics at Caltech, has published more than 50 papers, and holds 15 patents. Rowe has designed and fabricated many telescopes for Celestron and PlaneWave Instruments, including PlaneWave's corrected Dall-Kirkham and CDK700 telescope. He also worked closely with Celestron engineers in the development of the unique StarSense technology.\u003c\/p\u003e\n\u003cp\u003eMark Ackermann - amateur astronomer and experienced optical designer - earned a BS in mathematics and physics from the United States Air Force Academy, an MS in solid state physics, and a PhD in nonlinear optics from the University of New Mexico. He has published dozens of papers on optical telescope design and holds six US patents related to optical systems.\u003c\/p\u003e\n\u003cp\u003eEngineered as a complete astroimaging system, every component of the Celestron Rowe-Ackermann Schmidt Astrograph is optimized for peak performance with CMOS, smaller CCD camers, and mirrorless cameras. Every component of the system has been designed to work together seamlessly, right down to the thickness of the glass used in the scope's fully-multicoated optical window.\u003c\/p\u003e\n\u003cp\u003eSome of the advanced features of the Celestron 8\" RASA includes mirror locks hold your precise focus. A quiet high-output 12V internal MagLev fan on the rear cell reduces cooldown time and provides optimal airflow through the dust filtered 24.7\" long optical tube. Naturally, industry leading StarBright XLT optical multicoatings are standard equipment for the highest possible light throughput. A Losmandy-style \"D-plate\" dovetail is standard. The back focus with the included camera adapters is 25mm.\u003c\/p\u003e\n\u003cp\u003eThe Celestron #93614 RASA LPR (Imaging Filter is highly recommended with the RASA. The scope's incredibly fast f\/2 focal ratio gathers so much light so quickly that even modest amounts of sky glow at a dark sky site can brighten the sky background and reduce the contrast in your images. In light-polluted city and suburban locations, the RASA Light Pollution Reduction (LPR) Imaging Filter is a must.\u003c\/p\u003e\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003ctable style=\"border: 1px solid #fea200;\" class=\"compatibility-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eCamera\u003c\/th\u003e\n\u003cth\u003eCompatible with RASA 8?\u003c\/th\u003e\n\u003cth\u003eAdapter required\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAstronomical CMOS\/CCD camera with C-mount\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eC-mount adapter (included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAstronomical CMOS\/CCD camera with M42-thread mount\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eM42 adapter (included) with M42 extension tubes (not included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAstronomical CMOS\/CCD camera with other mount\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eCustom camera adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCanon mirrorless with APS-C sensor\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-of-canon-mirrorless-cameras.html\" target=\"_blank\"\u003eCanon mirrorless adapter\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e(sold separately)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSony mirrorless with APS-C sensor\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-for-sony-mirrorless-camera.html\" target=\"_blank\"\u003eSony mirrorless adapter\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e(sold separately)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCanon mirrorless with full frame (42mm) sensor\u003c\/td\u003e\n\u003ctd\u003eYes, but not optimized across the full sensor\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-of-canon-mirrorless-cameras.html\" target=\"_blank\"\u003eCanon mirrorless adapter\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e(sold separately)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSony mirrorless with full frame (42mm) sensor\u003c\/td\u003e\n\u003ctd\u003eYes, but not optimized across the full sensor\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-for-sony-mirrorless-camera.html\" target=\"_blank\"\u003eSony mirrorless adapter\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-for-sony-mirrorless-camera.html\" target=\"_blank\"\u003e(sold separately)\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDSLR\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #fdc001;\"\u003e--\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eTech Details: \u003c\/h2\u003e\n\u003ctable class=\"table\" id=\"product-attribute-specs-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e400mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e17 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMotorized Controls\u003c\/th\u003e\n\u003ctd class=\"data\"\u003en\/a\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e17 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical Coatings\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eStarbright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e.68 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSupplied Eyepiece\u003c\/th\u003e\n\u003ctd class=\"data\"\u003en\/a\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eSchmidt-Cassegrain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eSupplied Accessories: \u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eM42 camera adapter, C-thread camera adapter, fan battery pack\u003c\/span\u003e\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40481986150473,"sku":"RASA8","price":2199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/91073_8in_rowe-ackermann_schmidt_astrograph_01_570x380_2x_fbc8c8ae-a34a-469f-9a8b-902f38f2e288.jpg?v=1675379722"},{"product_id":"celestron-cgx-800-rasa-telescope","title":"Celestron CGX 800 RASA 8\" Telescope","description":"\u003cul\u003e\n\u003cli\u003eFlat field free of optical aberrations like field curvature, coma, astigmatism and chromatic aberration across an entire APS-C sensor.\u003c\/li\u003e\n\u003cli\u003eUnlike the larger RASAs that work with DSLR and large CCD cameras, the 8” model was designed with color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras in mind. The telescope does not work with standard DSLR cameras.\u003c\/li\u003e\n\u003cli\u003eNEW Ultra-Stable Focus System – six precision sealed ball bearings virtually eliminate image shift.\u003c\/li\u003e\n\u003cli\u003eIntegrated air cooling system –12V DC MagLev fan reduces cooldown time and provides optimal air flow while filtering out dust.\u003c\/li\u003e\n\u003cli\u003eInternal filter mount – seamlessly accommodates a Light Pollution Imaging Filter into the optical path.\u003c\/li\u003e\n\u003cli\u003ePerforms over a wider spectral range than most telescopes, from 390-800 nm, so more of the light passing through the astrograph is in sharp focus.\u003c\/li\u003e\n\u003cli\u003eThe CGX, with its 55 lb. load capacity, is Celestron’s most innovative, state-of-the art, computerized equatorial mount to date, and provides a very sturdy and rigid platform for the fully-loaded RASA 8.\u003c\/li\u003e\n\u003cli\u003eThe drive system utilizes low cog DC Servo motors with integrated optical encoders, belt and pulley motor connection, spring-loaded steel worm gears supported by precision sealed bearings, and brass worm wheels for smooth, accurate slewing and tracking performance with little backlash.\u003c\/li\u003e\n\u003cli\u003eFully remote imaging capable, with optical limit switches, home sensors, through-mount cabling, and hard stops.\u003c\/li\u003e\n\u003cli\u003eIncluded Celestron PWI software allows direct computer control via USB 2.0 connection.\u003c\/li\u003e\n\u003cli\u003eProven NexStar+ computerized telescope control technology supports functions to address imagers’ needs, such as All-Star Polar Alignment, Permanent Periodic Error Correction (PPEC), and adjustable tracking through meridian.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eThis Celestron 8\" f\/2 Rowe-Ackermann Schmidt Astrograph (RASA) optical tube has:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eVery fast 8\" f\/2 Rowe-Ackermann Schmidt optics \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eStarBright XLT optical multicoatings for the highest possible light transmission\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMagLev DC cooling fan and cooling vents \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBuilt-in corrector lens\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMirror locks\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e42mm T-thread and C Thread camera adapters\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCGE (Losmandy-style \"D-plate\") dovetails \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e2-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\"I don't get it. What do you look through?\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis might be the most common question people ask when you unpack your new Celestron Rowe-Ackermann Schmidt Astrograph (RASA). It's not only missing something that comes with virtually every telescope ever produced . . . an eyepiece . . . it doesn't even have a place to put an eyepiece. That's because the 400mm focal length f\/2 Celestron 8\" RASA is strictly a deep space imaging scope and cannot be used visually.\u003c\/p\u003e\n\u003cp\u003eBut what an imaging scope! It has a 22mm image circle that can handle CMOS cameras, smaller CCD cameras, and mirrorless cameras.  The telescope does not work with standard DSLR cameras. It provides a proven Schmidt corrector optical system with a built-in corrector lens that keeps the images free of coma, field curvature, and false color. The optical quality and spot size across the entire image circle are unprecedented for an astrograph in this price range - or even that of a much more expensive instrument.\u003cbr\u003e\u003cbr\u003eIts fast, wide field, f\/2 optics give you two huge advantages over traditional f\/10 catadioptric imaging scopes (even those using an optional f\/6.3 or f\/7 focal reducer). Those advantages? Better apparent tracking due to the image scale, plus shorter exposure times due to the speed of the optics. That means you can create better-looking deep space images in a fraction of the time it used to take, even without using an autoguider.\u003c\/p\u003e\n\u003cp\u003eThe Celestron RASA concept was to modernize the Celestron Schmidt camera, an instrument that had a loyal following, as its very fast focal ratio allowed amateur astrophotographers to produce wide field deep space images in the 1970s. Schmidt cameras could produce great images, but they wre and imaging scope only a really hard-core astrophotographer could love.\u003c\/p\u003e\n\u003cp\u003eThose Schmidt cameras used a single frame of 35mm film, cut from a roll of film. You flexed the chip of film in total darkness (being careful not to touch the emulsion side) to fit snugly into a curved holder that matched the camera's curved focal plane, then loaded it into the camera by feel inside a black cloth bag to avoid image-spoiling stray light. You manually guided your scope during the entire exposure, keeping your eye glued to the crosshairs of an illuminated reticle eyepiece so your stars wouldn't turn into elongated squiggles. Finally, after a sometimes multiple hour single exposure, you tediously processed the small chip of film in your own darkroom before you could even begin to see if you had captured a usable image.\u003c\/p\u003e\n\u003cp\u003eNo more. Telescope mount drive accuracy has improved tremendously, electronic eyeballs have taken over guiding, and fast digital photography has taken the place of slow 35mm film.\u003c\/p\u003e\n\u003cp\u003eToday's CCD camera can have sensors as large, if not larger, than film. To compensate for the new large sensors Celestron had to push the boundaries of the Schmidt camera design and make an entirely new type of instrument. The Celestron Rowe-Ackermann Schmidt Astrograph has provided that advance in the performance of deep space imaging scopes. With it, today's amateur astrophotographers can produce results rivaling that of the best professional observatory photos of only a few short years ago.\u003c\/p\u003e\n\u003cp\u003eAs with most advances in optics, the Celestron Rowe-Ackermann Schmidt Astrograph was designed not by committee, but by two dedicated optical experts who believed things could be done better - Dave Rowe and Mark Ackermann.\u003c\/p\u003e\n\u003cp\u003eDave Rowe - amateur astronomer, telescope maker, and optical designer - studied astronomy and astrophysics at Caltech, has published more than 50 papers, and holds 15 patents. Rowe has designed and fabricated many telescopes for Celestron and PlaneWave Instruments, including PlaneWave's corrected Dall-Kirkham and CDK700 telescope. He also worked closely with Celestron engineers in the development of the unique StarSense technology.\u003c\/p\u003e\n\u003cp\u003eMark Ackermann - amateur astronomer and experienced optical designer - earned a BS in mathematics and physics from the United States Air Force Academy, an MS in solid state physics, and a PhD in nonlinear optics from the University of New Mexico. He has published dozens of papers on optical telescope design and holds six US patents related to optical systems.\u003c\/p\u003e\n\u003cp\u003eEngineered as a complete astroimaging system, every component of the Celestron Rowe-Ackermann Schmidt Astrograph is optimized for peak performance with CMOS, smaller CCD camers, and mirrorless cameras. Every component of the system has been designed to work together seamlessly, right down to the thickness of the glass used in the scope's fully-multicoated optical window.\u003c\/p\u003e\n\u003cp\u003eSome of the advanced features of the Celestron 8\" RASA includes mirror locks hold your precise focus. A quiet high-output 12V internal MagLev fan on the rear cell reduces cooldown time and provides optimal airflow through the dust filtered 24.7\" long optical tube. Naturally, industry leading StarBright XLT optical multicoatings are standard equipment for the highest possible light throughput. A Losmandy-style \"D-plate\" dovetail is standard. The back focus with the included camera adapters is 25mm.\u003c\/p\u003e\n\u003cp\u003eThe Celestron #93614 RASA LPR (Imaging Filter is highly recommended with the RASA. The scope's incredibly fast f\/2 focal ratio gathers so much light so quickly that even modest amounts of sky glow at a dark sky site can brighten the sky background and reduce the contrast in your images. In light-polluted city and suburban locations, the RASA Light Pollution Reduction (LPR) Imaging Filter is a must.\u003c\/p\u003e\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003ctable class=\"compatibility-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eCamera\u003c\/th\u003e\n\u003cth\u003eCompatible with RASA 8?\u003c\/th\u003e\n\u003cth\u003eAdapter required\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAstronomical CMOS\/CCD camera with C-mount\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eC-mount adapter (included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAstronomical CMOS\/CCD camera with M42-thread mount\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eM42 adapter (included) with M42 extension tubes (not included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAstronomical CMOS\/CCD camera with other mount\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eCustom camera adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCanon mirrorless with APS-C sensor\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-of-canon-mirrorless-cameras.html\" target=\"_blank\"\u003eCanon mirrorless adapter\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e(sold separately)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSony mirrorless with APS-C sensor\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-for-sony-mirrorless-camera.html\" target=\"_blank\"\u003eSony mirrorless adapter\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e(sold separately)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCanon mirrorless with full frame (42mm) sensor\u003c\/td\u003e\n\u003ctd\u003eYes, but not optimized across the full sensor\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-of-canon-mirrorless-cameras.html\" target=\"_blank\"\u003eCanon mirrorless adapter\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e(sold separately)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSony mirrorless with full frame (42mm) sensor\u003c\/td\u003e\n\u003ctd\u003eYes, but not optimized across the full sensor\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-for-sony-mirrorless-camera.html\" target=\"_blank\"\u003eSony mirrorless adapter\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-for-sony-mirrorless-camera.html\" target=\"_blank\"\u003e(sold separately)\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDSLR\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003ctd\u003e--\u003cbr\u003e\u003cbr\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eThe CGX mount head contains dual-axis slewing\/tracking motors on each axis for go-to computer control. This is where the real upgrades start.The mount uses spring-loaded worm gears with belt drives. The belt drives offer smooth, quiet operation, with precision slewing and tracking. The motor armatures are skewed to minimize cogging for precise jitter-free low speed tracking. The motor drives and their wiring are all internal, keeping them snag-free and free from dust and debris.\u003c\/p\u003e\n\u003cp\u003eRedesigned electronics deliver constant regulated power to the motors, making them capable of driving the telescope even when the mount is not perfectly balanced. This allows the CGX to have the payload capacity of much larger mounts without sacrificing smooth tracking motion and pointing accuracy across the entire sky. For cutting edge mount control, the CGX supports Celestron's optional SkyPortal WiFi that lets you control the CGX from your smart devices. For automatic sky alignment, you can add Celestron's optional StarSense AutoAlign.\u003c\/p\u003e\n\u003cp\u003eThe mount requires a minimum 3.5 amp 12 VDC power supply to operate. The maximum 3.5 amp power draw happens only briefly when accelerating to the high speed slewing mode from a standing start, or decelerating from the high speed mode when approaching a computer-chosen object. Normal power draw with a well-balanced payload is generally less than half the maximum draw.\u003c\/p\u003e\n\u003cp\u003eThe mount comes with a car battery cord to operate from the cigarette lighter plug of your car or from a rechargeable 12V battery pack. The 17 amp hour capacity Celestron Power Tank #4517V is recommended and will operate the mount all night long without danger of running out of power. An optional Celestron #2338PRO 5 amp AC adapter will let you power the CGX all night long from household AC.\u003c\/p\u003e\n\u003cp\u003eTo make a casual polar alignment for visual use quick and easy, there's a latitude scale with large ergonomically-friendly altitude and azimuth adjustment knobs. No polar alignment finderscope is available to aid in the precise polar alignment required for long exposure astrophotography, nor is any needed.\u003c\/p\u003e\n\u003cp\u003eA unique Celestron All-Star Polar Alignment program built into the NexStar hand control helps you do a very precise computerized polar alignment in mere minutes, using any bright star, even when Polaris is hidden by trees or buildings. It works in both northern and southern hemispheres. This technology basically gets rid of the need for a polar alignment scope.\u003c\/p\u003e\n\u003cp\u003eThe supplied 17 pound counterweight is locked in place with a single hand-tighten knob, making it easy to rebalance a scope if you add heavy photographic accessories. If needed, optional counterweights are available to balance very heavy loads.\u003c\/p\u003e\n\u003cp\u003eFor observing or imaging objects near the meridian (the imaginary line passing directly overhead from North to South), the CGX is designed to track 20° past the meridian for uninterrupted imaging through the most ideal part of the sky.\u003c\/p\u003e\n\u003cp\u003eThere are nine motor drive speeds: 0.5x and 1x sidereal for guiding; 4x, 8x, 16x, and 64x for centering; and 1°, 2°, and a fast 5° per second for slewing. Preset tracking rates include sidereal, solar, and lunar. Equatorial tracking modes are available for both northern and southern hemispheres.\u003c\/p\u003e\n\u003cp\u003eNew for the CGX mount is a telescope control software that has been developed in conjunction with Planewave Instruments. Planewave Instruments produces some of the most sophisticated imaging systems on the planet. The features of the included software are extremely robust. They include multi-point go-to modeling, focusing, and plate solving. ou will no longer need a third party advanced PC control software as this has it all.\u003c\/p\u003e\n\u003cp\u003eThe supplied NexStar computer hand control has a built-in database of more than 40,000 stars and objects. These include the complete RNGC, Messier, Caldwell, IC, and Abell catalogs; selected SAO stars; the planets, the Moon, and others. The custom database lists of all the most famous deep-sky objects by name and catalog number; the most beautiful double, triple and quadruple stars; selected variable stars; non-planetary solar system objects; and asterisms.\u003c\/p\u003e\n\u003cp\u003eYou can also store and edit the right ascension and declination of 100 additional user-defined objects of your own choosing, such as the comet and asteroid coordinates published monthly in Astronomy and Sky \u0026amp; Telescope magazines. The computer control can find any of those objects with only a few keystrokes, and track them with high accuracy for visual or photographic applications. There is enhanced information on over 200 of the most note-worthy objects.\u003c\/p\u003e\n\u003cp\u003eThe NexStar hand control provides a constant digital r. a. and dec readout of the scope's position on the sky. This provides much greater accuracy than conventional manual setting circles for star-hopping or locating objects by their celestial coordinates alone, should you want to observe the old-fashioned way without using the computer to find objects for you.\u003c\/p\u003e\n\u003cp\u003eThe software built into the NexStar hand control includes mount calibration, database filter limits, hibernate, five alignment procedures, user-defined slew limits, a new \"All-Star\" polar alignment routine that uses any bright star for a quick and accurate polar alignment, and more. Built-in adjustable backlash compensation permits precise corrections during astrophotography and when observing visually at high powers. A high precision pointing subroutine in the computer lets you point accurately at objects that you want to photograph that are too dim to be seen though the scope.\u003c\/p\u003e\n\u003cp\u003eThe software includes permanent programmable periodic error correction (PEC) to correct for the minor periodic tracking errors inherent to all worm drives that might otherwise mar your long exposure photographs. The CGX mount retains the PEC recordings when it is powered down. The hand control and motor control software is flash-upgradeable to allow you to download the latest product updates over the Internet to keep your CGX mount always at the cutting edge of technology.\u003c\/p\u003e\n\u003cp\u003eAn autoguider port is located on the electronic pier for long exposure astrophotography. The autoguider port can use a six-pin RJ-12 modular jack ST-4 compatible CCD autoguider to automatically control the drive motors during long exposure astrophotography.\u003c\/p\u003e\n\u003cp\u003eFive different alignment methods are built into the Celestron mount's NexStar computer: 2-star align, quick align, 1-star align, last alignment, and solar system align. This allows you to choose a level of computer accuracy in automatically finding objects with which you are comfortable. Alignment is easily accomplished in only a few short minutes. You can be observing in less than 15 minutes after you first take your CGX-mounted scope outdoors.\u003c\/p\u003e\n\u003cp\u003eIn addition, the NexStar computer hand control is GPS-compatible (using an optional inexpensive SkySync GPS module) for full GPS (Global Positioning System) accuracy. Adding GPS to the computer is something no competitively-priced mount can do. Once the scope is approximately polar aligned, the 16-channel SkySync GPS system uses signals from government satellites to calculate the scope's location on earth with an accuracy measured in meters. The system also calculates the current time based on the split second accuracy of the GPS time signals.\u003c\/p\u003e\n\u003cp\u003eAfter the SkySync quickly completes these calculations, and enters the information into the computer control for you automatically, the computer then orients the scope with the sky, slews to a pair of guide stars, asks you to confirm that the stars are in the center of the field (and center them if they're not precisely aligned), and then starts finding and tracking over 40,000 objects for you at your command. With the Celestron CGX go-to mount and the SkySync, orienting your scope in time and space on earth and aligning it on the sky becomes almost as easy a task as simply turning the mount on.\u003c\/p\u003e\n\u003cp\u003eThe new, 2\" diameter adjustable height tripod has graduated markings on the legs to help with quick leveling.The center leg brace is drilled to form a convenient accessory tray that holds 1.25\" and 2\" eyepieces to keep them up out of the dew-soaked grass.\u003c\/p\u003e\n\u003cp\u003eOptical tubes are installed on the CGX mount using a Dual-Slot on the mount head that accepts either a Celestron CGE-style or Losmandy D-plate dovetail slide bar or the narrower Vixen-Style dovetail. This allows the optical tube to be quickly and precisely balanced fore and aft on the mount, eliminating the need for an extra counterweight to balance a camera or other accessories. Setup and takedown times are exceptionally fast, as a single large hand-tighten knob holds the optical tube in place. A second lock knob prevents the tube from sliding off the mount should the hand-tighten knob loosen.\u003c\/p\u003e\n\u003ch2\u003eTech Details: \u003c\/h2\u003e\n\u003ctable class=\"table\" id=\"product-attribute-specs-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e400mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/2.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e44 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMotorized Controls\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eComputerized GoTo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e124.2 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical Coatings\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eStarbright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSupplied Eyepiece\u003c\/th\u003e\n\u003ctd class=\"data\"\u003en\/a\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eSchmidt-Cassegrain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40481986216009,"sku":"CGXRASA8","price":4299.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/12058_cgx_800_rowe-ackermann_schmidt_astrograph_01_570x380_2x_8c5a84ad-f4dc-4ccd-b557-34cadd378464.jpg?v=1675379726"},{"product_id":"celestron-cgem-ii-800-rasa-8-telescope","title":"Celestron CGEM II 800 RASA 8\" Telescope","description":"\u003cul\u003e\n\u003cli\u003eFlat field free of optical aberrations like field curvature, coma, astigmatism and chromatic aberration across an entire APS-C sensor.\u003c\/li\u003e\n\u003cli\u003eUnlike the larger RASAs that work with DSLR and large CCD cameras, the 8” model was designed with color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras in mind. The telescope does not work with standard DSLR cameras.\u003c\/li\u003e\n\u003cli\u003eNEW Ultra-Stable Focus System – six precision sealed ball bearings virtually eliminate image shift.\u003c\/li\u003e\n\u003cli\u003eInternal filter mount – seamlessly accommodates a Light Pollution Imaging Filter into the optical path.\u003c\/li\u003e\n\u003cli\u003ePerforms over a wider spectral range than most telescopes, from 390 - 800 nm, so more of the light passing through the astrograph is in sharp focus.\u003c\/li\u003e\n\u003cli\u003eThe CGEM II, with its 40 lbs load capacity, is the latest update to the venerable CGEM mount and provides a sturdy and rigid platform for the fully-loaded RASA 8.\u003c\/li\u003e\n\u003cli\u003eThe drive system, consisting of low cog DC Servo motors with integrated optical encoders, steel worm gears supported by precision sealed bearings, and brass worm wheels, ensures smooth and accurate slewing and tracking.\u003c\/li\u003e\n\u003cli\u003eProven NexStar+ computerized telescope control technology supports functions to address imagers’ needs, such as All-Star Polar Alignment, Permanent Periodic Error Correction (PPEC), and adjustable tracking through meridian.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eThis Celestron 8\" f\/2 Rowe-Ackermann Schmidt Astrograph (RASA) optical tube has:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eVery fast 8\" f\/2 Rowe-Ackermann Schmidt optics \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eStarBright XLT optical multicoatings for the highest possible light transmission\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMagLev DC cooling fan and cooling vents \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBuilt-in corrector lens\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMirror locks\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e42mm T-thread and C Thread camera adapters\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCGE (Losmandy-style \"D-plate\") dovetails \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e2-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\"I don't get it. What do you look through?\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis might be the most common question people ask when you unpack your new Celestron Rowe-Ackermann Schmidt Astrograph (RASA). It's not only missing something that comes with virtually every telescope ever produced . . . an eyepiece . . . it doesn't even have a place to put an eyepiece. That's because the 400mm focal length f\/2 Celestron 8\" RASA is strictly a deep space imaging scope and cannot be used visually.\u003c\/p\u003e\n\u003cp\u003eBut what an imaging scope! It has a 22mm image circle that can handle CMOS cameras, smaller CCD cameras, and mirrorless cameras.  The telescope does not work with standard DSLR cameras. It provides a proven Schmidt corrector optical system with a built-in corrector lens that keeps the images free of coma, field curvature, and false color. The optical quality and spot size across the entire image circle are unprecedented for an astrograph in this price range - or even that of a much more expensive instrument.\u003cbr\u003e\u003cbr\u003eIts fast, wide field, f\/2 optics give you two huge advantages over traditional f\/10 catadioptric imaging scopes (even those using an optional f\/6.3 or f\/7 focal reducer). Those advantages? Better apparent tracking due to the image scale, plus shorter exposure times due to the speed of the optics. That means you can create better-looking deep space images in a fraction of the time it used to take, even without using an autoguider.\u003c\/p\u003e\n\u003cp\u003eThe Celestron RASA concept was to modernize the Celestron Schmidt camera, an instrument that had a loyal following, as its very fast focal ratio allowed amateur astrophotographers to produce wide field deep space images in the 1970s. Schmidt cameras could produce great images, but they wre and imaging scope only a really hard-core astrophotographer could love.\u003c\/p\u003e\n\u003cp\u003eThose Schmidt cameras used a single frame of 35mm film, cut from a roll of film. You flexed the chip of film in total darkness (being careful not to touch the emulsion side) to fit snugly into a curved holder that matched the camera's curved focal plane, then loaded it into the camera by feel inside a black cloth bag to avoid image-spoiling stray light. You manually guided your scope during the entire exposure, keeping your eye glued to the crosshairs of an illuminated reticle eyepiece so your stars wouldn't turn into elongated squiggles. Finally, after a sometimes multiple hour single exposure, you tediously processed the small chip of film in your own darkroom before you could even begin to see if you had captured a usable image.\u003c\/p\u003e\n\u003cp\u003eNo more. Telescope mount drive accuracy has improved tremendously, electronic eyeballs have taken over guiding, and fast digital photography has taken the place of slow 35mm film.\u003c\/p\u003e\n\u003cp\u003eToday's CCD camera can have sensors as large, if not larger, than film. To compensate for the new large sensors Celestron had to push the boundaries of the Schmidt camera design and make an entirely new type of instrument. The Celestron Rowe-Ackermann Schmidt Astrograph has provided that advance in the performance of deep space imaging scopes. With it, today's amateur astrophotographers can produce results rivaling that of the best professional observatory photos of only a few short years ago.\u003c\/p\u003e\n\u003cp\u003eAs with most advances in optics, the Celestron Rowe-Ackermann Schmidt Astrograph was designed not by committee, but by two dedicated optical experts who believed things could be done better - Dave Rowe and Mark Ackermann.\u003c\/p\u003e\n\u003cp\u003eDave Rowe - amateur astronomer, telescope maker, and optical designer - studied astronomy and astrophysics at Caltech, has published more than 50 papers, and holds 15 patents. Rowe has designed and fabricated many telescopes for Celestron and PlaneWave Instruments, including PlaneWave's corrected Dall-Kirkham and CDK700 telescope. He also worked closely with Celestron engineers in the development of the unique StarSense technology.\u003c\/p\u003e\n\u003cp\u003eMark Ackermann - amateur astronomer and experienced optical designer - earned a BS in mathematics and physics from the United States Air Force Academy, an MS in solid state physics, and a PhD in nonlinear optics from the University of New Mexico. He has published dozens of papers on optical telescope design and holds six US patents related to optical systems.\u003c\/p\u003e\n\u003cp\u003eEngineered as a complete astroimaging system, every component of the Celestron Rowe-Ackermann Schmidt Astrograph is optimized for peak performance with CMOS, smaller CCD camers, and mirrorless cameras. Every component of the system has been designed to work together seamlessly, right down to the thickness of the glass used in the scope's fully-multicoated optical window.\u003c\/p\u003e\n\u003cp\u003eSome of the advanced features of the Celestron 8\" RASA includes mirror locks hold your precise focus. A quiet high-output 12V internal MagLev fan on the rear cell reduces cooldown time and provides optimal airflow through the dust filtered 24.7\" long optical tube. Naturally, industry leading StarBright XLT optical multicoatings are standard equipment for the highest possible light throughput. A Losmandy-style \"D-plate\" dovetail is standard. The back focus with the included camera adapters is 25mm.\u003c\/p\u003e\n\u003cp\u003eThe Celestron #93614 RASA LPR (Imaging Filter is highly recommended with the RASA. The scope's incredibly fast f\/2 focal ratio gathers so much light so quickly that even modest amounts of sky glow at a dark sky site can brighten the sky background and reduce the contrast in your images. In light-polluted city and suburban locations, the RASA Light Pollution Reduction (LPR) Imaging Filter is a must.\u003c\/p\u003e\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003ctable class=\"compatibility-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eCamera\u003c\/th\u003e\n\u003cth\u003eCompatible with RASA 8?\u003c\/th\u003e\n\u003cth\u003eAdapter required\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAstronomical CMOS\/CCD camera with C-mount\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eC-mount adapter (included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAstronomical CMOS\/CCD camera with M42-thread mount\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eM42 adapter (included) with M42 extension tubes (not included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAstronomical CMOS\/CCD camera with other mount\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eCustom camera adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCanon mirrorless with APS-C sensor\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-of-canon-mirrorless-cameras.html\" target=\"_blank\"\u003eCanon mirrorless adapter\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e(sold separately)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSony mirrorless with APS-C sensor\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-for-sony-mirrorless-camera.html\" target=\"_blank\"\u003eSony mirrorless adapter\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e(sold separately)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCanon mirrorless with full frame (42mm) sensor\u003c\/td\u003e\n\u003ctd\u003eYes, but not optimized across the full sensor\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-of-canon-mirrorless-cameras.html\" target=\"_blank\"\u003eCanon mirrorless adapter\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e(sold separately)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSony mirrorless with full frame (42mm) sensor\u003c\/td\u003e\n\u003ctd\u003eYes, but not optimized across the full sensor\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-for-sony-mirrorless-camera.html\" target=\"_blank\"\u003eSony mirrorless adapter\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-for-sony-mirrorless-camera.html\" target=\"_blank\"\u003e(sold separately)\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDSLR\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003ctd\u003e--\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe Celestron CGEM II is an upgraded heavy-duty computerized go-to German equatorial moun. The ergonomically-designed CGEM II has a fresh, attractive, bold appearance – and a 40 pound payload capacity. This allows it to carry Celestron SCT optical tubes up to 11\" in aperture, plus a full load of imaging accessories, as well as virtually any other optical tube and accessory payload less than 40 pounds in weight.\u003c\/p\u003e\n\u003cp\u003eThe CGEM II mount head contains dual-axis slewing\/tracking motors on each axis for go-to computer control. Steel worm gears and 90mm diameter brass worm wheels assure long-term reliability and high accuracy performance. The use of low cog DC Servo motors with integrated optical positioning encoders offers smooth, quiet operation and precision slewing and tracking. The motor armatures are skewed to minimize cogging for precise jitter-free low speed tracking. The motor drives and their wiring are all internal, keeping them snag-free and free from dust and debris.\u003c\/p\u003e\n\u003cp\u003eThe mount requires a minimum 1.5 amp 12 VDC power supply to operate. The maximum 1.5 amp power draw happens only briefly when accelerating to, or decelerating from, the high speed slewing mode from a standing start with a small payload (8\" SCT OTA or similar). Normal power draw with a well-balanced payload is generally less than half the maximum draw.\u003c\/p\u003e\n\u003cp\u003eThe mount comes with a car battery cord to operate from the cigarette lighter plug of your car or from a rechargeable 12V battery pack. The 17 amp hour capacity Celestron Power Tank #4517V is recommended and will operate the mount all night long without danger of running out of power. An optional Celestron #2338PRO 5 amp ac adapter is available to run the CGEM II all night from household AC in backyard or observatory.\u003c\/p\u003e\n\u003cp\u003eTo make a casual polar alignment for visual use quick and easy, there's a latitude scale with large ergonomically-friendly altitude and azimuth adjustment knobs. No polar alignment finderscope is available to aid in the precise polar alignment required for long exposure astrophotography, nor is any needed. A unique Celestron All-Star Polar Alignment program built into the NexStar hand control helps you do a very precise computerized polar alignment in mere minutes, using any bright star, even when Polaris is hidden by trees or buildings. It works in both northern and southern hemispheres.\u003c\/p\u003e\n\u003cp\u003eThe supplied 17 pound counterweight is locked in place on the steel counterweight shaft with a single hand-tighten knob, making it easy to rebalance a scope if you add heavy photographic accessories. If needed, optional counterweights are available to balance very heavy loads.\u003c\/p\u003e\n\u003cp\u003eFor observing or imaging objects near the meridian (the imaginary line passing directly overhead from North to South), the CGEM II is designed to track well past the meridian for uninterrupted imaging through the most ideal part of the sky.\u003c\/p\u003e\n\u003cp\u003eThere are nine motor drive speeds: 0.5x and 1x sidereal for guiding; 4x, 8x, 16x, and 64x for centering; and 1°, 2°, and a fast 5° per second for slewing. Preset tracking rates include sidereal, solar, and lunar. Equatorial tracking modes are available for both northern and southern hemispheres.\u003c\/p\u003e\n\u003cp\u003eThe supplied NexStar computer hand control has a built-in database of more than 40,000 stars and objects. These include the complete RNGC, Messier, Caldwell, IC, and Abell catalogs; selected SAO stars; the planets, the Moon, and others. The custom database lists of all the most famous deep-sky objects by name and catalog number; the most beautiful double, triple and quadruple stars; selected variable stars; non-planetary solar system objects; and asterisms.\u003c\/p\u003e\n\u003cp\u003eYou can also store and edit the right ascension and declination of 400 additional user-defined objects of your own choosing, such as the comet and asteroid coordinates published monthly in \u003cem\u003eAstronomy\u003c\/em\u003e and \u003cem\u003eSky \u0026amp; Telescope\u003c\/em\u003e magazines. The computer control can find any of those objects with only a few keystrokes, and track them with high accuracy for visual or photographic applications. There is enhanced information on over 200 of the most note-worthy objects.\u003c\/p\u003e\n\u003cp\u003eThe NexStar computer control of the smooth and precise CGEM II go-to mount makes finding over 40,000 stars and objects easy and automatic, so you can spend more time looking at them, rather than looking for them.\u003c\/p\u003e\n\u003cp\u003eNew for the CGEM II mount, a USB 2.0 communication port on the hand control allows you to operate the telescope via a personal computer using a USB cable and NexRemote software CD-ROM. The hand control and motor control software is flash-upgradeable to allow you to download the latest product updates over the Internet to keep your CGEM II mount always at the cutting edge of technology. An autoguider port is located on the electronic pier for guided, but unattended, long exposure astrophotography.\u003c\/p\u003e\n\u003cp\u003eThe NexStar hand control provides a constant digital r. a. and dec readout of the scope's position on the sky. This provides much greater accuracy than conventional manual setting circles for star-hopping or locating objects by their celestial coordinates alone, should you want to observe the old-fashioned way without using the computer to find objects for you.\u003c\/p\u003e\n\u003cp\u003eThe software built into the NexStar hand control includes mount calibration, database filter limits, hibernate, five alignment procedures, user-defined slew limits, a new \"All-Star\" polar alignment routine that uses any bright star for a quick and accurate polar alignment, and more. Built-in adjustable backlash compensation permits precise corrections during astrophotography and when observing visually at high powers. A high precision pointing subroutine in the computer lets you point accurately at objects that you want to photograph that are too dim to be seen though the scope.\u003c\/p\u003e\n\u003cp\u003eThe software includes permanent programmable periodic error correction (PEC) to correct for the minor periodic tracking errors inherent to all worm drives that might otherwise mar your long exposure photographs. The CGEM II mount retains the PEC recordings when it is powered down. The hand control and motor control software is flash-upgradeable to allow you to download the latest product updates over the Internet to keep your CGEM II mount always at the cutting edge of technology.\u003c\/p\u003e\n\u003cp\u003eAn autoguider port is located on the electronic pier for long exposure astrophotography. The autoguider port can use a six-pin RJ-12 modular jack ST-4 compatible CCD autoguider to automatically control the drive motors during long exposure astrophotography.\u003c\/p\u003e\n\u003cp\u003eFive different alignment methods are built into the NexStar computer - 2-star align, quick align, 1-star align, last alignment, and solar system align - allowing you to choose a level of computer accuracy in automatically finding objects with which you are comfortable. Alignment is easily accomplished in only a few short minutes. You can be observing in less than 15 minutes after you first take your CGEM II-mounted scope outdoors.\u003c\/p\u003e\n\u003cp\u003eIn addition, the NexStar computer hand control is GPS-compatible (using an optional inexpensive SkySync GPS module) for full GPS (Global Positioning System) satellite accuracy. Adding GPS to the computer is something no competitively-priced mount can do. Once the scope is approximately polar aligned, the 16-channel SkySync GPS system uses signals from government satellites to calculate the scope's location on earth with an accuracy measured in meters. The system also calculates the current time based on the split second accuracy of the GPS time signals.\u003c\/p\u003e\n\u003cp\u003eAfter the SkySync quickly completes these calculations and enters the information into the computer control for you automatically, the computer can then orient the scope with the sky, slew to a pair of guide stars, ask you to confirm that the stars are in the center of the field (and center them if they're not precisely aligned), and then start finding and tracking over 40,000 objects for you at your command. With the CGEM II go-to mount and the SkySync, orienting your scope in time and space on earth and aligning it on the sky becomes almost as easy a task as simply turning the mount on.\u003c\/p\u003e\n\u003cp\u003eThe adjustable height tripod has 2\" diameter stainless steel legs with a metal center leg brace for rigidity to provide excellent damping characteristics. The center leg brace is drilled to form a convenient accessory tray that holds 1.25\" and 2\" eyepiece to keep them up out of the dew-soaked grass.\u003c\/p\u003e\n\u003cp\u003eNew for the CGEM II mount is a dual saddle plate. The saddle plate will now accept both the CGE\/Losmandy wide dovetail plate as well as the AVX\/Vixen style dovetail plate. The dovetail slot on the top of the mount holds the long dovetail slide bar mounted under the optical tube. This allows you to slide the optical tube fore and aft in the dovetail slot to quickly and precisely balance the optical tube in declination when you add or subtract accessories, eliminating the need for an extra counterweight to balance a camera or other accessories. Setup and takedown times are exceptionally fast, as a single large hand-tighten knob holds the optical tube in place. A second lock knob prevents the tube from sliding off the mount should the hand-tighten knob loosen. The oversized dovetail mounting platform assures secure vibration-free tube attachment.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e400mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e40 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMotorized Controls\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eComputerized GoTo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e95 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical Coatings\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eStarbright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e.68 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSupplied Eyepiece\u003c\/th\u003e\n\u003ctd class=\"data\"\u003en\/a\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eSchmidt-Cassegrain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40481986248777,"sku":"CGEMIIRASA8","price":3599.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/12020_cgemii_800_rowe-ackermann_schmidt_astrograph_01_570x380_2x_feff482e-5c17-410a-b286-e150c8ec2205.jpg?v=1675379728"},{"product_id":"takahashi-epsilon-e-130d-astrograph","title":"Takahashi Epsilon E-130D Astrograph","description":"\u003cp\u003eWide-field imagers rejoice!  The Takahashi Epsilon E-130D telescope is an incredible wide-field imaging machine.\u003c\/p\u003e\n\u003cp\u003eThe Epsilon series of astrographs are specifically designed for exceptional astrophotography. Takahashi’s proprietary optical design features a hyperbolic, concave primary mirror with a 2 element ED corrector lens to eliminate spherical aberration and coma. Compared to the conventional Schmidt camera design, the chromatic aberration is reduced by half, even out to large viewing angles.\u003c\/p\u003e\n\u003cp\u003eThe new ε-130D is the same aperture as the original but now uses a digital corrector. This corrector produces improved sharpness and a 1\/3rd reduction in the size of the spot equaling the spot size of the E-180 at the edge producing a 44 mm diameter circle. The offset secondary insures better illumination of the image formed by the primary.\u003c\/p\u003e\n\u003cp\u003eThe ε-130D has a 5.9° field of view which is perfect for imaging wide field objects like comets and objects with extended nebulosity. With a speed of f\/3.3 and a focal length of 430mm the ε-130D will shorten exposure times, increase color saturation and will produce wide field high performance images.\u003c\/p\u003e\n\u003ch2\u003eTech Details: \u003c\/h2\u003e\n\u003ctable id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e130mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e430mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/3.3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e10.78 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e10.78 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":40481986674761,"sku":"TEK13010","price":2570.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/lg-epsilon.jpg?v=1675379756"},{"product_id":"takahashi-epsilon-e-180ed-astrograph","title":"Takahashi Epsilon E-180ED Astrograph","description":"\u003cp\u003eThe Takahashi Epsilon E-180ED is fast imaging system for the most discerning user.\u003c\/p\u003e\n\u003cp\u003eThe Epsilon series of astrographs are specifically designed for exceptional astrophotography. Takahashi’s proprietary optical design features a hyperbolic, concave primary mirror with a 2 element ED corrector lens to eliminate spherical aberration and coma. Compared to the conventional Schmidt camera design, the chromatic aberration is reduced by half, even out to large viewing angles.\u003c\/p\u003e\n\u003cp\u003eThe ε-180 was introduced by Takahashi as the first of the new Epsilon flat–field hyperbolic astrographs since the 1980’s. The ε-180 was designed to be a very fast f\/2.8 imaging system.\u003c\/p\u003e\n\u003cp\u003eThis fast field photo visual astrograph is perfect for digital SLR's and CCD cameras. The f\/2.8 speed will enable the imager to record faint nebulosity not visible in slower instruments. In addition, the appreciably shorter exposure times reduce tracking error and will produce pin point stars. The ε-180 will produce 10 micron stars across the entire 44 mm diagmer flat 5 degree field.\u003c\/p\u003e\n\u003cp\u003eThe focuser has been improved to allow more precise focusing. Each has a metal insert with a special non-cold flow material to allow for correct focus.\u003c\/p\u003e\n\u003ch2\u003eTech Details: \u003c\/h2\u003e\n\u003ctable id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e180mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e500mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/2.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e24 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e24 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":40481986707529,"sku":"TEK18010","price":5510.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/telescope-takahashi-epsilon-180-tube-seul_2.jpg?v=1675379757"},{"product_id":"celestron-advanced-vx-800-8-rasa-goto-astrograph","title":"Celestron Advanced VX 800 8\" RASA GoTo Astrograph","description":"\u003cp\u003ePossibly the best portable imaging platform available today.  Look no farther if imaging is in your heart.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Celestron 8\" f\/2 Rowe-Ackermann Schmidt Astrograph (RASA) optical tube has:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eVery fast 8\" f\/2 Rowe-Ackermann Schmidt optics \u003c\/li\u003e\n\u003cli\u003eStarBright XLT optical multicoatings for the highest possible light transmission\u003c\/li\u003e\n\u003cli\u003eMagLev DC cooling fan and cooling vents\u003c\/li\u003e\n\u003cli\u003eBuilt-in corrector lens\u003c\/li\u003e\n\u003cli\u003eMirror locks\u003c\/li\u003e\n\u003cli\u003e42mm T-thread and C Thread camera adapters\u003c\/li\u003e\n\u003cli\u003eCGE (Losmandy-style \"D-plate\") dovetails\u003c\/li\u003e\n\u003cli\u003e2-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\"I don't get it. What do you look through?\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis might be the most common question people ask when you unpack your new Celestron Rowe-Ackermann Schmidt Astrograph (RASA). It's not only missing something that comes with virtually every telescope ever produced . . . an eyepiece . . . it doesn't even have a place to put an eyepiece. That's because the 400mm focal length f\/2 Celestron 8\" RASA is strictly a deep space imaging scope and cannot be used visually.\u003c\/p\u003e\n\u003cp\u003eBut what an imaging scope! It has a 22mm image circle that can handle CMOS cameras, smaller CCD cameras, and mirrorless cameras.  The telescope does not work with standard DSLR cameras. It provides a proven Schmidt corrector optical system with a built-in corrector lens that keeps the images free of coma, field curvature, and false color. The optical quality and spot size across the entire image circle are unprecedented for an astrograph in this price range - or even that of a much more expensive instrument.\u003cbr\u003e\u003cbr\u003eIts fast, wide field, f\/2 optics give you two huge advantages over traditional f\/10 catadioptric imaging scopes (even those using an optional f\/6.3 or f\/7 focal reducer). Those advantages? Better apparent tracking due to the image scale, plus shorter exposure times due to the speed of the optics. That means you can create better-looking deep space images in a fraction of the time it used to take, even without using an autoguider.\u003c\/p\u003e\n\u003cp\u003eThe Celestron RASA concept was to modernize the Celestron Schmidt camera, an instrument that had a loyal following, as its very fast focal ratio allowed amateur astrophotographers to produce wide field deep space images in the 1970s. Schmidt cameras could produce great images, but they were an imaging scope only a really hard-core astrophotographer could love.\u003c\/p\u003e\n\u003cp\u003eThose Schmidt cameras used a single frame of 35mm film, cut from a roll of film. You flexed the chip of film in total darkness (being careful not to touch the emulsion side) to fit snugly into a curved holder that matched the camera's curved focal plane, then loaded it into the camera by feel inside a black cloth bag to avoid image-spoiling stray light. You manually guided your scope during the entire exposure, keeping your eye glued to the crosshairs of an illuminated reticle eyepiece so your stars wouldn't turn into elongated squiggles. Finally, after a sometimes multiple hour single exposure, you tediously processed the small chip of film in your own darkroom before you could even begin to see if you had captured a usable image.\u003c\/p\u003e\n\u003cp\u003eNo more. Telescope mount drive accuracy has improved tremendously, electronic eyeballs have taken over guiding, and fast digital photography has taken the place of slow 35mm film.\u003c\/p\u003e\n\u003cp\u003eToday's CCD camera can have sensors as large, if not larger, than film. To compensate for the new large sensors Celestron had to push the boundaries of the Schmidt camera design and make an entirely new type of instrument. The Celestron Rowe-Ackermann Schmidt Astrograph has provided that advance in the performance of deep space imaging scopes. With it, today's amateur astrophotographers can produce results rivaling that of the best professional observatory photos of only a few short years ago.\u003c\/p\u003e\n\u003cp\u003eAs with most advances in optics, the Celestron Rowe-Ackermann Schmidt Astrograph was designed not by committee, but by two dedicated optical experts who believed things could be done better - Dave Rowe and Mark Ackermann.\u003c\/p\u003e\n\u003cp\u003eDave Rowe - amateur astronomer, telescope maker, and optical designer - studied astronomy and astrophysics at Caltech, has published more than 50 papers, and holds 15 patents. Rowe has designed and fabricated many telescopes for Celestron and PlaneWave Instruments, including PlaneWave's corrected Dall-Kirkham and CDK700 telescope. He also worked closely with Celestron engineers in the development of the unique StarSense technology.\u003c\/p\u003e\n\u003cp\u003eMark Ackermann - amateur astronomer and experienced optical designer - earned a BS in mathematics and physics from the United States Air Force Academy, an MS in solid state physics, and a PhD in nonlinear optics from the University of New Mexico. He has published dozens of papers on optical telescope design and holds six US patents related to optical systems.\u003c\/p\u003e\n\u003cp\u003eEngineered as a complete astroimaging system, every component of the Celestron Rowe-Ackermann Schmidt Astrograph is optimized for peak performance with CMOS, smaller CCD camers, and mirrorless cameras. Every component of the system has been designed to work together seamlessly, right down to the thickness of the glass used in the scope's fully-multicoated optical window.\u003c\/p\u003e\n\u003cp\u003eSome of the advanced features of the Celestron 8\" RASA includes mirror locks hold your precise focus. A quiet high-output 12V internal MagLev fan on the rear cell reduces cooldown time and provides optimal airflow through the dust filtered 24.7\" long optical tube. Naturally, industry leading StarBright XLT optical multicoatings are standard equipment for the highest possible light throughput. A Losmandy-style \"D-plate\" dovetail is standard. The back focus with the included camera adapters is 25mm.\u003c\/p\u003e\n\u003cp\u003eThe Celestron #93614 RASA LPR (Imaging Filter is highly recommended with the RASA. The scope's incredibly fast f\/2 focal ratio gathers so much light so quickly that even modest amounts of sky glow at a dark sky site can brighten the sky background and reduce the contrast in your images. In light-polluted city and suburban locations, the RASA Light Pollution Reduction (LPR) Imaging Filter is a must.\u003c\/p\u003e\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003ctable class=\"compatibility-table\" style=\"width: 100.088%;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 33.5714%;\"\u003eCamera\u003c\/th\u003e\n\u003cth style=\"width: 39.386%;\"\u003eCompatible with RASA 8?\u003c\/th\u003e\n\u003cth style=\"width: 26.3282%;\"\u003eAdapter required\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 33.5714%;\"\u003eAstronomical CMOS\/CCD camera with C-mount\u003c\/td\u003e\n\u003ctd style=\"width: 39.386%;\"\u003eYes\u003c\/td\u003e\n\u003ctd style=\"width: 26.3282%;\"\u003eC-mount adapter (included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 33.5714%;\"\u003eAstronomical CMOS\/CCD camera with M42-thread mount\u003c\/td\u003e\n\u003ctd style=\"width: 39.386%;\"\u003eYes\u003c\/td\u003e\n\u003ctd style=\"width: 26.3282%;\"\u003eM42 adapter (included) with M42 extension tubes (not included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 33.5714%;\"\u003eAstronomical CMOS\/CCD camera with other mount\u003c\/td\u003e\n\u003ctd style=\"width: 39.386%;\"\u003eYes\u003c\/td\u003e\n\u003ctd style=\"width: 26.3282%;\"\u003eCustom camera adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 33.5714%;\"\u003eCanon mirrorless with APS-C sensor\u003c\/td\u003e\n\u003ctd style=\"width: 39.386%;\"\u003eYes\u003c\/td\u003e\n\u003ctd style=\"width: 26.3282%;\"\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-of-canon-mirrorless-cameras.html\" data-mce-href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-of-canon-mirrorless-cameras.html\" target=\"_blank\"\u003eCanon mirrorless adapter\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e(sold separately)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 33.5714%;\"\u003eSony mirrorless with APS-C sensor\u003c\/td\u003e\n\u003ctd style=\"width: 39.386%;\"\u003eYes\u003c\/td\u003e\n\u003ctd style=\"width: 26.3282%;\"\u003e\n\u003cp\u003eSony mirrorless adapter\u003c\/p\u003e\n\u003cp\u003e(sold separately)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 33.5714%;\"\u003eCanon mirrorless with full frame (42mm) sensor\u003c\/td\u003e\n\u003ctd style=\"width: 39.386%;\"\u003eYes, but not optimized across the full sensor\u003c\/td\u003e\n\u003ctd style=\"width: 26.3282%;\"\u003e\n\u003cp\u003eCanon mirrorless adapter\u003c\/p\u003e\n\u003cp\u003e(sold separately)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 33.5714%;\"\u003eSony mirrorless with full frame (42mm) sensor\u003c\/td\u003e\n\u003ctd style=\"width: 39.386%;\"\u003eYes, but not optimized across the full sensor\u003c\/td\u003e\n\u003ctd style=\"width: 26.3282%;\"\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-for-sony-mirrorless-camera.html\" data-mce-href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-for-sony-mirrorless-camera.html\" target=\"_blank\"\u003eSony mirrorless adapter\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-for-sony-mirrorless-camera.html\" data-mce-href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-for-sony-mirrorless-camera.html\" target=\"_blank\"\u003e(sold separately)\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 33.5714%;\"\u003eDSLR\u003c\/td\u003e\n\u003ctd style=\"width: 39.386%;\"\u003eNo\u003c\/td\u003e\n\u003ctd style=\"width: 26.3282%;\"\u003e--\u003cbr\u003e\u003cbr\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eThis kit combines the 8” Rowe-Ackermann Schmidt Astrograph (RASA) with the strong-yet-portable Advanced VX German equatorial mount. Simply add a mirrorless camera and this package offers everything you need to take spectacular images of wide-field deep sky objects.\u003c\/p\u003e\n\u003cp\u003eCapture spectacular wide-field deep sky images in seconds with Celestron’s new portable astrograph, the 8” Rowe-Ackermann Schmidt Astrograph (RASA). This incredibly fast f\/2.0 system is the perfect companion to today’s color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras. Thanks to its fast focal ratio and patented optical design, you can produce sharp, detailed images and, in many cases, skip the autoguider completely. Weighing in at just 17 pounds, it’s easy to transport your 8” RASA to the most remote dark sky locations.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRASA Performance Made for Everyone\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 8” RASA is an imaging telescope that delivers a flat field without optical aberrations for razor sharp stars across a wide field of view. It can capture stunning deep-sky astronomical images without the challenges typically presented by longer focal length instruments at a fraction of the cost of those systems.\u003c\/p\u003e\n\u003cp\u003eThe latest addition to the RASA family, this 8” version is a much more portable and affordable version of the heralded RASA 11, which was introduced to much acclaim in 2014. With the 8” RASA joining the lineup, a wider range of astroimagers can enjoy the benefits of the RASA design. It has many of the same thoughtfully designed features as its “big brother” RASA 11, including the integrated air-cooling system, internal filter mount, and sturdy CGE dovetail mounting bar.\u003c\/p\u003e\n\u003cp\u003ePurely designed for imaging, the 8” RASA cannot be used visually. The prime focus focal plane is located at the front of the optical system, so it cannot accommodate a traditional eyepiece.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShorter Exposure Times and Virtual “Real-Time” Observing\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSince it is an F\/2.0 optical system, imagers can use shorter exposure times to capture detail in faint objects. When combined with sensitive cameras and the proper “live stacking” software, the 8” RASA can provide an almost real-time observing experience. View images on a computer instantly that are brighter and more detailed than can be seen in much bigger telescopes with the naked eye.\u003c\/p\u003e\n\u003cp\u003eBecause shorter exposure times are possible, your equatorial mount won’t need to accurately track over extended periods. The 8” RASA’s relatively short 400mm focal length also lessens equatorial tracking demands. In many cases, autoguiding will not be required. Weighing only 17 lb, this optical tube pairs perfectly with a wide variety of mounts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eUltra-Stable Focus System\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWith the launch of the 8” RASA, Celestron is unveiling a new focuser design that mitigates lateral movement of the primary mirror when focusing, slewing, or tracking with the astrograph. Focusing is easier, more accurate, and more stable than ever. The key to the Ultra-Stable Focus System is two sets of precision bearings that are precisely aligned and tested during assembly to ensure optimal results.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAdvanced VX \u0026amp; Tripod\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Advanced VX mount is designed to provide superior performance for smaller telescopes while taking advantage of Celestron’s most advanced technologies: All-Star Polar Alignment, Celestron PWI telescope control software, SkyAlign, and permanently programmable periodic error correction (PPEC).\u003c\/p\u003e\n\u003cp\u003eIf you’re an experienced imager, you’ll love taking this portable mount to a dark sky site and enjoying all the conveniences of a larger observatory mount. Or, if you’re new to imaging, Advanced VX will help you get started with the hobby and keep up with your needs for years to come.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eComputerized German equatorial moun\u003c\/strong\u003et\u003c\/p\u003e\n\u003cp\u003eThe Advanced VX is the smallest of Celestron’s German equatorial mounts. The computerized GoTo capability automatically tracks objects as they move across the night sky. The Advanced VX mount includes ports for a hand control, an autoguider, and 2 AUX ports for optional accessories. The NexStar+ hand control gives you instant access to all the functions your mount has to offer. With automatic slewing and menu descriptions, astronomers of all skill levels can master this mount in just a few observing sessions. The Advanced VX also has an impressive tripod for its class with 2”-diameter steel tripod legs, providing an extra-wide stance for improved stability.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePayload capacity\u003c\/strong\u003e\u003cbr\u003eThe payload capacity for the Advanced VX is 30 lb. It offers a sturdy platform for the 8” Rowe-Ackermann Schmidt Astrograph optical tube, even when paired with optional accessories like StarSense AutoAlign, Focus Motor, a finderscope, and a camera. Celestron's payload capacity does not include the weight of the counterweights.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDual saddle plate\u003c\/strong\u003e\u003cbr\u003eAs of early 2019, Advanced VX mounts now include a new dual saddle plate that accommodates both CG-5 and CGE-style dovetails. Switching between the two saddle plates is as simple as moving the hand knobs into a separate set of holes. Now you can use your Advanced VX mount not only with the 8” RASA, but virtually any optical tube within Advanced VX’s weight limit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSoftware\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCelestron PWI Telescope Control Software\u003cbr\u003eYour Ultimate Astronomy Software Suite\u003c\/p\u003e\n\u003cp\u003eAll current Celestron computerized telescopes include Celestron PWI (CPWI), the most advanced astronomy software suite provided with any consumer-grade telescope. Celestron’s experts co-developed CPWI with the engineers at PlaneWave Instruments. The result is an all-in-one solution offering you many of the same features used on PlaneWave’s observatory-class telescopes.\u003c\/p\u003e\n\u003cp\u003eGraphical planetarium interface with PointXP advanced mount modelling allows you to add 100+ points to your alignment model for the most accurate pointing and tracking possible\u003cbr\u003eIdeal for remote observatory setups: save and re-load your alignment and park your scope\u003cbr\u003eProvides a complete ASCOM telescope interface to allow control of the telescope from third party software applications\u003cbr\u003eFor more information on CPWI and to see the user interface, click here.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStarry Night Software\u003c\/strong\u003e\u003cbr\u003eAlso included with your purchase is a free download of Celestron’s Starry Night Special Edition Software. This advanced software by Simulation Curriculum offers detailed information about celestial objects and helps you plan your next observing or imaging session. The Special Edition software also includes telescope control via your PC.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAccessories Included\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Advanced VX RASA 8 comes complete with a M42 camera adapter, C-thread camera adapter, and fan battery pack.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e8\" (203mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e400mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/2.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e18 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMotorized Controls\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eComputerized GoTo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e64 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical Coatings\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eStarBright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eSupplied Accessories: \u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe Advanced VX RASA 8 comes complete with a M42 camera adapter, C-thread camera adapter, and fan battery pack.\u003c\/span\u003e\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40481987133513,"sku":"AVX8R","price":2899.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/12035_avx_800_rowe-ackermann_schmidt_astrograph_02_570x380_2x_590eac15-921f-478c-b30b-f7aaee8de6ba.jpg?v=1675379778"},{"product_id":"celestron-11-f-2-2-rowe-ackermann-schmidt-astrograph-rasa-on-cgx-l-mount-12078","title":"Celestron 11\" f\/2.2 Rowe-Ackermann Schmidt Astrograph (RASA) Version 2 On CGX-L Mount 12074","description":"\u003cp\u003eCombine the exceptional wide-field imaging optics of the Celestron 11\" f\/2.22 Rowe-Ackermann Schmidt Astrograph (RASA) Version 2 with the proven excellence of the heavy-duty Celestron CGX-L go-to equatorial mount and you have an imaging scope that is equally at home in your backyard, in your observatory, or in the field at a dark sky site.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Celestron 11\" f\/2.2 Rowe-Ackermann Schmidt Astrograph (RASA) CGE Pro mount combination has:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eVery fast 11\" f\/2.2 Rowe-Ackermann Schmidt optics and New Ultra-Stable Focus System (USFS)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eStarBright XLT optical multicoatings for the highest possible light transmission \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMagLev DC cooling fan and cooling vents \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBuilt-in four-element rare earth corrector lens \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e42mm T-thread and 48mm camera adapters \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCGX-L go-to German equatorial mount \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e2-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eDetails on the Celestron 11\" RASA Version 2 optical tube . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Celestron Rowe-Ackermann Schmidt Astrograph (RASA) Version 2 updates and improves the Celestron Schmidt camera, a premium wide-field imaging instrument of the 1970s that had a loyal following, but a difficult instrument to use that only a really hard-core 35mm film astrophotographer could love.\u003c\/p\u003e\n\u003cp\u003eToday, fast DSLR and CCD electronic imaging has taken the place of slow 35mm film. Home computers can manipulate and improve DSLR and CCD images in ways that 35mm imagers could only dream of. DSLRs and CCD cameras can have sensors as large as (and in some cases larger than) 35mm film.\u003c\/p\u003e\n\u003cp\u003eTo compensate for these new large sensors Celestron had to push the boundaries of the Schmidt camera design and make an entirely new type of instrument, the RASA. The Celestron RASA provides an advance in the performance of deep space imaging scopes that lets today's amateur astrophotographers produce wide field results rivaling those of the best professional observatory photos of only a few short years ago.\u003c\/p\u003e\n\u003cp\u003eThe 11\" 620mm focal length f\/2.22 Celestron Rowe-Ackermann Schmidt Astrograph is an imaging-only optical tube. It has a huge 70mm image circle that can handle full frame DSLRs and the largest sensor size CCD cameras with minimal or no vignetting. The RASA combines a proven Schmidt corrector optical system with a built-in 4-element rare earth corrector lens that keeps the images free of coma, field curvature, and false color. The optical quality and spot size across the entire image circle are unprecedented for an astrograph in this price range - or even that of much more expensive instruments.\u003c\/p\u003e\n\u003cp\u003eIts fast, wide field, f\/2.22 optics give you two huge advantages over traditional f\/10 catadioptric imaging scopes (even those using an optional f\/6.3 or f\/7 focal reducer). You get better apparent tracking due to the image scale, plus shorter exposure times due to the speed of the optics. That means you can create better-looking deep space images and mosaics in a fraction of the time it used to take, even without using an autoguider.\u003c\/p\u003e\n\u003cp\u003eThe Celestron 11\" RASA has a Rayleigh Limit (photographic resolution) of 0.50 arc seconds. It is capable of revealing much finer deep space detail than a similar focal length 4\" apo refractor (a scope type often used for wide field imaging), which has a Rayleigh Limit of 1.36 arc seconds. And the RASA will record those more detailed images in a fraction the time of that 4\" apo.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eRASA 11 V2 utilizes the new Ultra-Stable Focus System (USFS). At the heart of this system is a precision linear ball bearing. The bearing serves to minimize focus shift (unwanted lateral motion of the primary mirror during focusing which causes shifting of the image) and mirror flop (movement of the primary mirror when the telescope is pointing to different positions in the sky). The USFS is also compatible with the optional Celestron Focus Motor (#94155-A). The integrated 12V DC MagLev fan reduces cooldown time and provides optimal airflow through the dust filtered optical tube.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eNaturally, industry leading StarBright XLT optical multicoatings are standard for the highest possible light throughput. 42mm T-thread DSLR and 48mm CCD camera adapters are standard equipment. Two Losmandy-style \"D-plate\" dovetails are standard, one on the bottom of the RASA for installing it on the CGX-L mount, and one on top for installing accessories (such as on optional photoguide scope). The back focus from the included camera adapters is 55mm.\u003c\/p\u003e\n\u003cp\u003eAn astrograph as good as the Celestron 11\" RASA demands a mount that is on its level. The Celestron CGX-L is that mount.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDetails on the Celestron CGX-L go-to German equatorial mount . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe German equatorial mount has long been the favored choice of astronomy buffs and astrophotographers because of its stability and portability. It is more stable because the center of gravity is directly over the center of its base, and more portable because it can be broken down into smaller component parts than a fork-mount telescope for easy storage and transportation.\u003c\/p\u003e\n\u003cp\u003eFor astrophotography, the German equatorial mount offers easier balancing; unlimited space at the rear of the telescope tube to mount a long camera equipment train that can't bump into the drive base, as is the case with many fork-mounted scopes; and whole sky access that many fork-mounted scopes can't achieve.\u003c\/p\u003e\n\u003cp\u003eCelestron has looked to update the way that people interact with their equipment. This quest has brought out a new EQ Mount Series, the CGX. This particular model in the series is the CGX-L and boasts a 75 pound payload capacity.\u003c\/p\u003e\n\u003cp\u003eHeavy duty mount head: The Celestron CGX-L is a newly-designed high payload capacity\/high precision go-to German equatorial mount that epitomizes all of these German equatorial mount virtues. With its full 75 pound payload capacity it will carry Celestron SCT\/HD optical tubes up to 14\" in aperture, as well as virtually any other optical tube and accessory payload weighing up to 75 pounds.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNew features are everywhere in the mount head:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e1. Ergonomic handles help you move the 47 pound head with ease. That's right; the head weighs 47 pounds and will carry 75. It is an incredible load to weight ratio.\u003c\/p\u003e\n\u003cp\u003e2. Additional accessory ports built into the dovetail saddle plate of the equatorial head. There are two auxillary ports as well as an autoguider port. The internal cabling of the CGX-L mount works hand in hand with these new ports on the saddle helping the imager in all of us manage our cables.\u003c\/p\u003e\n\u003cp\u003e3. The dovetail saddle plate is longer for added stability and will also accept both Vixen\/AVX and Losmandy\/Celestron D Style dovetails.\u003c\/p\u003e\n\u003cp\u003e4. There are built in home and limit sensors. The home sensor will take the scope back to its home position at any time and the limit sensor will prevent the mount from slewing past a certain point.\u003c\/p\u003e\n\u003cp\u003e5. There are also built-in mechanical hard stops to prevent an instrument from damage should you forget to lock the mount.\u003c\/p\u003e\n\u003cp\u003eMount drive system: The CGX-L mount head contains 144mm worm wheels in both Right Ascension and Declination. The improved drive system uses a belt-driven worm gear that is spring loaded. The significance of this is it allows the drive to maintain optimum gear mesh for smoother tracking and less backlash.\u003c\/p\u003e\n\u003cp\u003eThe mount requires 2.5 amp 12 VDC power to operate. The maximum 2.5 amp power draw happens only briefly when accelerating to the high speed slewing mode from a standing start. Normal power draw with a well-balanced payload is generally considerably less than half the maximum draw. The mount comes with a car battery cord to operate from the cigarette lighter plug of your car or from a rechargeable 12VDC battery pack. The 17 amp hour capacity Celestron Power Tank #4517V is recommended and will operate the mount all night long without danger of running out of power.\u003c\/p\u003e\n\u003cp\u003eSpecially designed power management electronics deliver constant regulated power to the motor so that it is capable of driving the mount even when your scope not perfectly balanced. This allows the CGX-L to have the payload capacity of that of much larger (and expensive) mounts without sacrificing smooth tracking motion and pointing accuracy across the entire sky.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePolar alignment:\u003c\/strong\u003e To make a casual no-tool polar alignment for visual use quick and easy, there's a latitude scale with large ergonomically-friendly altitude and azimuth adjustment knobs. If serious long exposure astrophotography is in your plans, the special All-Star Polar Alignment software described below allows you to choose any bright alignment star for a software-assisted alignment of the mount's polar axis, even if you can't see the North Star. The mount also has upgraded adjustments for Latitude and Azimuth. Large one hand knobs make moving a full loaded mount head a dream with a simple twist of the wrist.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCounterweights:\u003c\/strong\u003e The CGX-L mount comes with two 22 pound counterweights. The counterweights lock in place on the 5 pound steel counterweight shaft with a single hand-tighten knob, making it easy to rebalance your scope in right ascension if you add heavy photographic accessories. If needed, optional counterweights are available to balance very heavy loads.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHeavy duty tripod:\u003c\/strong\u003e The CGX-L mount's adjustable height Super HD tripod has 2.75\" diameter stainless steel legs. The height adjustment leg locks are on the inside of the tripod legs to keep them from snagging on clothing in the dark. The tripod uses a dual leg support for maximum rigidity, with an upper leg brace to provide an outward preload and a lower leg brace providing inward tension. The upper leg brace forms a convenient tray that holds eyepieces and accessories, as well as a slot to hold your smart phone or tablet, to keep them up out of the dew-soaked grass. This tray is a new design that will allow you to keep it attached while you fold the legs up.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMounting an optical tube:\u003c\/strong\u003e Optical tubes are installed on the CGX-L mount using a slot on the mount head that accepts a Celestron CGE-style\/Losmandy D-plate dovetail or a Celestron AVX\/CG5\/Vixen slide bar. This allows the optical tube to be quickly and precisely balanced fore and aft on the mount in declination, eliminating the need for an extra counterweight to balance a camera or other accessories. Setup and takedown times are exceptionally fast, with large hand-tighten knobs holding the optical tube in place.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMount weight:\u003c\/strong\u003e The CGE Pro mount weighs in at 121 pounds. The equatorial head is 47 pounds. The tripod weighs 47 pounds. The supplied counterweight weighs 22 pounds, while the thread-in counterweight shaft weighs 5 pounds. The new ergonomic handles makes it much easier for a single person to move and break down the mount in the field with ease.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNexStar computer hand control:\u003c\/strong\u003e The NexStar computer hand control of the CGX-L mount has a built-in database of more than 40,000 stars, deep space objects, and solar system objects it can locate for you. These include the complete RNGC, Messier, Caldwell, IC, and Abell catalogs; selected SAO stars; the planets, the Moon, and others. The custom database lists of all the most famous deep-sky objects by name and catalog number; the most beautiful double, triple and quadruple stars; variable stars; non-planetary solar system objects; and asterisms. It contains enough fascinating objects to keep you busy observing for the rest of your life.\u003c\/p\u003e\n\u003cp\u003eYou can also store and edit the right ascension and declination of 100 objects of your own choosing, such as the comet and asteroid coordinates published monthly in Astronomy and Sky \u0026amp; Telescope magazines. The computer control can quickly find any of those objects at your command, and track them with high accuracy for visual observing or astrophotography.\u003c\/p\u003e\n\u003cp\u003eAll of the database and scope operation information is displayed on a double line, 16-character, liquid crystal display on the hand control. This display leads you through the steps necessary to line up the scope on the sky, locate objects, control scope functions like the brightness of the hand control display, and much more. It shows you basic information about the object being viewed (such as the object's name, catalog designation, type, magnitude, and so forth). In addition to this basic information, there is enhanced information on over 200 of the most note-worthy objects. The display can also show you the right ascension and declination coordinates at which the scope is aimed.\u003c\/p\u003e\n\u003cp\u003eAlignment on the sky and go-to accuracy: No polar alignment finderscope is available for the CGX-L mount, nor is any needed. A unique Celestron All-Star Polar Alignment program built into the NexStar hand control helps you do a very precise polar alignment in mere minutes for long exposure astrophotography. It works in both northern and southern hemispheres.\u003c\/p\u003e\n\u003cp\u003eTo accurately polar align your scope, first do a reasonably-accurate mechanical alignment of the mount on the celestial pole by eye. To make this initial alignment quick and easy, there's a latitude scale and fine adjustment controls in both altitude and azimuth. Next, use the mount's standard two-star alignment method to align your scope on the sky. Select a suitable bright star from the NexStar hand control's data base and slew your telescope to the star. A star near the meridian and close to the celestial equator will give the most accurate alignment results. Then, press the Align button on the hand control and select Polar Align: Align Mount from the hand control menu. Your telescope will re-slew to the alignment star and ask you to center it in the eyepiece in order to \"Sync\" on the star. After you sync on the star, your telescope will automatically slew to the position that the star should be at if your mount was accurately polar aligned. Use the mount's altitude and azimuth adjustment knobs to place the star in the center of the eyepiece and press the Align button. That's all there is to it! Your CGE Pro mount is now accurately aligned on the celestial pole.\u003c\/p\u003e\n\u003cp\u003eAlthough the telescope's tracking may be very good after alignment, pointing accuracy may need to be improved (particularly if you are trying to located small objects on a CCD chip), depending on how close your initial mechanical alignment was on the pole, and by much the mount had to be moved during polar alignment. If that's the case, you can easily update your telescope's star alignment in a minute or two if necessary.\u003c\/p\u003e\n\u003cp\u003eOnce polar aligned, several different sky alignment methods are built into the NexStar computer to line up the scope on the celestial sphere, allowing you to choose a level of computer accuracy in automatically finding objects with which you are comfortable. These include 2-Star Align, Solar System Align, Last Alignment, Quick Align, and 1-Star Align,\u003c\/p\u003e\n\u003cp\u003eWith just a standard hand control alignment, the CGE Pro computer has the ability to center a star in your telescope's eyepiece or on a CCD chip to within 5 arc minutes. Using the NexStar computer's advanced pointing features (such as Calibration Stars, Sync, and Precise Go-To) further improves the pointing accuracy to as low as 1 arc minute in the desired region of the sky. The high precision pointing subroutine (Precise Go-To) in the computer lets you point accurately at objects that you want to photograph that are too dim to be seen though the scope. Other software features include: database filter limits, a mount hibernate mode, and user-defined slew limits.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGPS compatible:\u003c\/strong\u003e In addition, the NexStar computer hand control is GPS-compatible (using an optional inexpensive CN16 GPS module) for full GPS (Global Positioning System) satellite accuracy. Once the scope is approximately polar aligned, the 16-channel CN16 GPS system uses signals from government satellites to calculate the scope's location on earth with an accuracy measured in meters. The system also calculates the current time based on the split second accuracy of the GPS time signals. After the CN16 quickly completes these calculations and enters the information into the computer control for you automatically, the computer then orients the scope with the sky, slews to a pair of guide stars, asks you to confirm that the stars are in the center of the field (and center them if they're not precisely aligned), and then starts finding and tracking over 40,000 objects for you at your command. With the CGX-L go-to mount and the CN16, orienting the scope in time and space on earth and aligning your telescope on the sky becomes almost as easy a task as simply turning on your CGX-L mount.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTwo-year warranty:\u003c\/strong\u003e All Celestron go-to telescopes have a two-year warranty, double that of competitive go-to scopes.\u003c\/p\u003e\n\u003cp\u003eThe complete RASA\/CGX-L mount combination weighs 169 pounds (85.9 kg). The tripod\/electronics pier is the heaviest component, at 47 pounds (23.6 kg). The equatorial head weighs 47 pounds (34.1 kg). The supplied counterweight weighs 22 pounds (10 kg) each, and the counterweight shaft 5 pounds (2.3 kg). The 11\" RASA optical tube weighs 35 pounds (15.9 kg). The image shown above includes an optional CCD camera mounted on the RASA OTA.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable style=\"max-width: 500px;\" id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e11\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e620mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/2.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e75 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e189 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.50 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eSupplied Accessories:\u003c\/h2\u003e\n\u003cdiv id=\"product_tabs_accessories_contents\" class=\"product-tabs-content\"\u003e\n\u003cdiv class=\"product-tabs-content-inner clearfix\"\u003e\n\u003cdiv class=\"box-collateral box-desc\"\u003e\n\u003cdiv class=\"std\"\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 11.2px;\"\u003eDust covers\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e42mm T-thread and 48mm camera adapters\u003c\/li\u003e\n\u003cli\u003eDC (car battery) power cord\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40481990312009,"sku":"CGXL11R2","price":7499.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/20306_1.jpg?v=1675379952"},{"product_id":"celestron-11-f-2-2-rowe-ackermann-schmidt-astrograph-rasa-version-2-optical-tube","title":"Celestron 11\" f\/2.2 Rowe-Ackermann Schmidt Astrograph (RASA) Version 2 Optical Tube","description":"\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eThe 11\" f\/2.2 Rowe-Ackermann Schmidt Astrograph (RASA) - the next advance in deep space imaging - is available now for the serious astrophotographer.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThis Celestron 11\" f\/2.2 Rowe-Ackermann Schmidt Astrograph (RASA) Version2 optical tube has:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eVery fast 11\" f\/2.2 Rowe-Ackermann Schmidt optics with Mirror Locks\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eStarBright XLT optical multicoatings for the highest possible light transmission\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eMagLev DC cooling fan and cooling vents \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eBuilt-in four-element rare earth corrector lens\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eNew Ultra-Stable Focus System (USFS) minimizes focus shift and mirror flop\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003e42mm T-thread and 48mm camera adapters\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eTwo CGE (Losmandy-style \"D-plate\") dovetails \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003e2-year warranty\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e\"I don't get it. What do you look through?\"\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis might be the most common question people ask when you unpack your new Celestron Rowe-Ackermann Schmidt Astrograph (RASA) Version 2. It's not only missing something that comes with virtually every telescope ever produced . . . an eyepiece . . . it doesn't even have a place to put an eyepiece. That's because the 620mm focal length f\/2.22 Celestron 11\" RASA is strictly a deep space imaging scope and cannot be used visually.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBut what an imaging scope! It has a huge 70mm image circle that can handle full frame DSLRs and the largest sensor size CCD cameras with minimal vignetting. It provides a proven Schmidt corrector optical system with a built-in 4-element rare earth corrector lens that keeps the images free of coma, field curvature, and false color. The optical quality and spot size across the entire image circle are unprecedented for an astrograph in this price range - or even that of a much more expensive instrument.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eIts fast, wide field, f\/2.22 optics give you two huge advantages over traditional f\/10 catadioptric imaging scopes (even those using an optional f\/6.3 or f\/7 focal reducer). Those advantages? Better apparent tracking due to the image scale, plus shorter exposure times due to the speed of the optics. That means you can create better-looking deep space images in a fraction of the time it used to take, even without using an autoguider.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Celestron RASA concept was to modernize the Celestron Schmidt camera, an instrument that had a loyal following, as its very fast focal ratio allowed amateur astrophotographers to produce wide field deep space images in the 1970s. Schmidt cameras could produce great images, but they wre and imaging scope only a really hard-core astrophotographer could love.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThose Schmidt cameras used a single frame of 35mm film, cut from a roll of film. You flexed the chip of film in total darkness (being careful not to touch the emulsion side) to fit snugly into a curved holder that matched the camera's curved focal plane, then loaded it into the camera by feel inside a black cloth bag to avoid image-spoiling stray light. You manually guided your scope during the entire exposure, keeping your eye glued to the crosshairs of an illuminated reticle eyepiece so your stars wouldn't turn into elongated squiggles. Finally, after a sometimes multiple hour single exposure, you tediously processed the small chip of film in your own darkroom before you could even begin to see if you had captured a usable image.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNo more. Telescope mount drive accuracy has improved tremendously, electronic eyeballs have taken over guiding, and fast digital photography has taken the place of slow 35mm film.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eToday's CCD camera can have sensors as large, if not larger, than film. To compensate for the new large sensors Celestron had to push the boundaries of the Schmidt camera design and make an entirely new type of instrument. The Celestron Rowe-Ackermann Schmidt Astrograph has provided that advance in the performance of deep space imaging scopes. With it, today's amateur astrophotographers can produce results rivaling that of the best professional observatory photos of only a few short years ago.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAs with most advances in optics, the Celestron Rowe-Ackermann Schmidt Astrograph was designed not by committee, but by two dedicated optical experts who believed things could be done better - Dave Rowe and Mark Ackermann.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDave Rowe - amateur astronomer, telescope maker, and optical designer - studied astronomy and astrophysics at Caltech, has published more than 50 papers, and holds 15 patents. Rowe has designed and fabricated many telescopes for Celestron and PlaneWave Instruments, including PlaneWave's corrected Dall-Kirkham and CDK700 telescope. He also worked closely with Celestron engineers in the development of the unique StarSense technology.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMark Ackermann - amateur astronomer and experienced optical designer - earned a BS in mathematics and physics from the United States Air Force Academy, an MS in solid state physics, and a PhD in nonlinear optics from the University of New Mexico. He has published dozens of papers on optical telescope design and holds six US patents related to optical systems.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEngineered as a complete astroimaging system, every component of the Celestron Rowe-Ackermann Schmidt Astrograph is optimized for peak performance with DSLR and astronomical CCD cameras. Every component of the system has been designed to work together seamlessly, right down to the thickness of the glass used in the scope's fully-multicoated optical window. With a Rayleigh Limit (photographic resolution) of 0.50 arc seconds, the Celestron 11\" RASA is capable of revealing much finer deep space detail than a similar focal length 4\" apo refractor (a scope type often used for wide-field imaging), which has a Rayleigh Limit of 1.36 arc seconds. And the RASA will record those more detailed images in a fraction the time of that 4\" apo.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eRASA 11 V2 utilizes the new Ultra-Stable Focus System (USFS). At the heart of this system is a precision linear ball bearing. The bearing serves to minimize focus shift (unwanted lateral motion of the primary mirror during focusing which causes shifting of the image) and mirror flop (movement of the primary mirror when the telescope is pointing to different positions in the sky). The USFS is also compatible with the optional Celestron Focus Motor (#94155-A). The integrated 12V DC MagLev fan reduces cooldown time and provides optimal airflow through the dust filtered 33\" long optical tube. Naturally, industry leading StarBright XLT optical multicoatings are standard equipment for the highest possible light throughput. 42mm T-thread DSLR and 48mm CCD camera adapters are supplied as standard equipment with the 35 pound optical tube. Two Losmandy-style \"D-plate\" dovetails are standard, one on the bottom of the tube for installing it on your equatorial mount, and one on top for installing accessories (such as a photoguide scope). The back focus from the included camera adapters is 55mm.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eYou can see some examples of the RASA's imaging capabilities in the images above, which are just portions of the 2136 x 1752 pixel original. Taken at the 2014 Texas Star Party, the original image of Markarian's Chain of galaxies is the result of 58 x 90 second shots with the Celestron RASA 11\" on the Celestron CGEM DX mount, using a QHY11 color camera. The imagers were working on 90 second subs and getting 17th magnitude detail, as the camera would oversaturate at two minutes, due to the RASA's very fast f\/2.2 focal ratio. Comparable subs with a refractor would probably take 12 to 15 minutes. Star party participants had trouble believing that the subs were only 90 seconds long . . . until the photographers took a 90 second exposure and showed them the results immediately.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eJohn Davis took the tri-color RASA image of the Propeller Nebula (DWB-111), an emission nebula in Cygnus, with a QSI 583 monochrome camera from his Bucksnort Observatory in Texas. This first RASA image of the Propeller is scheduled to appear in the issue of August Sky \u0026amp; Telescope magazine. Total exposure time was 1.3 hours, consisting of 40 minutes H-alpha; 21 minutes luminance; and six minutes each of red, blue, and green. The image is a portion of the 1600 x 1153 pixel original.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Celestron #93617 RASA LPR (Imaging Filter is highly recommended with the RASA. The scope's incredibly fast f\/2.2 focal ratio gathers so much light so quickly that even modest amounts of sky glow at a dark sky site can brighten the sky background and reduce the contrast in your images. In light-polluted city and suburban locations, the RASA Light Pollution Reduction (LPR) Imaging Filter is a must.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e11\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e620mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/2.22\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e35 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.50 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eSupplied Accessories: \u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eDust covers\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eMagLev cooling fan\u003c\/p\u003e\n\u003cdiv\u003eTwo Losmandy-style \"D-plate\" dovetails\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003cdiv\u003e42mm T-thread and 48mm camera adapters\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40559408414793,"sku":"RASA11V2","price":4499.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/20206_1.jpg?v=1689243010"},{"product_id":"celestron-8-rowe-ackermann-schmidt-astrograph-rasa-8-imaging-kit","title":"Celestron 8” Rowe-Ackermann Schmidt Astrograph (RASA 8) Imaging Kit","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFlat field free of optical aberrations like field curvature, coma, astigmatism and chromatic aberration across an entire APS-C sensor.\u003c\/li\u003e\n\u003cli\u003eUnlike the larger RASAs that work with DSLR and large CCD cameras, the 8” model was designed with color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras in mind. The telescope does not work with standard DSLR cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eNEW\u003c\/span\u003e Ultra-Stable Focus System – six precision sealed ball bearings virtually eliminate image shift.\u003c\/li\u003e\n\u003cli\u003eIntegrated air cooling system –12V DC MagLev fan reduces cooldown time and provides optimal air flow while filtering out dust.\u003c\/li\u003e\n\u003cli\u003eInternal filter mount – seamlessly accommodates a Light Pollution Imaging Filter into the optical path.\u003c\/li\u003e\n\u003cli\u003eCGE dovetail mounting rail.\u003c\/li\u003e\n\u003cli\u003ePerforms over a wider spectral range than most telescopes, from 390-800 nm, so more of the light passing through the astrograph is in sharp focus.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eThis special kit also includes the Celestron Light Pollution Imaging Filter and the Celestron H-Alpha, H-Beta, and OIII imaging filter.  \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Celestron 8\" f\/2 Rowe-Ackermann Schmidt Astrograph (RASA) optical tube has:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eVery fast 8\" f\/2 Rowe-Ackermann Schmidt optics \u003cbr\u003eStarBright XLT optical multicoatings for the highest possible light transmission\u003cbr\u003eMagLev DC cooling fan and cooling vents \u003cbr\u003eBuilt-in corrector lens\u003cbr\u003eMirror locks\u003cbr\u003e42mm T-thread and C Thread camera adapters\u003cbr\u003eCGE (Losmandy-style \"D-plate\") dovetails \u003cbr\u003e2-year warranty\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\"I don't get it. What do you look through?\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis might be the most common question people ask when you unpack your new Celestron Rowe-Ackermann Schmidt Astrograph (RASA). It's not only missing something that comes with virtually every telescope ever produced . . . an eyepiece . . . it doesn't even have a place to put an eyepiece. That's because the 400mm focal length f\/2 Celestron 8\" RASA is strictly a deep space imaging scope and cannot be used visually.\u003c\/p\u003e\n\u003cp\u003eBut what an imaging scope! It has a 22mm image circle that can handle CMOS cameras, smaller CCD cameras, and mirrorless cameras.  The telescope does not work with standard DSLR cameras. It provides a proven Schmidt corrector optical system with a built-in corrector lens that keeps the images free of coma, field curvature, and false color. The optical quality and spot size across the entire image circle are unprecedented for an astrograph in this price range - or even that of a much more expensive instrument.\u003cbr\u003e\u003cbr\u003eIts fast, wide field, f\/2 optics give you two huge advantages over traditional f\/10 catadioptric imaging scopes (even those using an optional f\/6.3 or f\/7 focal reducer). Those advantages? Better apparent tracking due to the image scale, plus shorter exposure times due to the speed of the optics. That means you can create better-looking deep space images in a fraction of the time it used to take, even without using an autoguider.\u003c\/p\u003e\n\u003cp\u003eThe Celestron RASA concept was to modernize the Celestron Schmidt camera, an instrument that had a loyal following, as its very fast focal ratio allowed amateur astrophotographers to produce wide field deep space images in the 1970s. Schmidt cameras could produce great images, but they wre and imaging scope only a really hard-core astrophotographer could love.\u003c\/p\u003e\n\u003cp\u003eThose Schmidt cameras used a single frame of 35mm film, cut from a roll of film. You flexed the chip of film in total darkness (being careful not to touch the emulsion side) to fit snugly into a curved holder that matched the camera's curved focal plane, then loaded it into the camera by feel inside a black cloth bag to avoid image-spoiling stray light. You manually guided your scope during the entire exposure, keeping your eye glued to the crosshairs of an illuminated reticle eyepiece so your stars wouldn't turn into elongated squiggles. Finally, after a sometimes multiple hour single exposure, you tediously processed the small chip of film in your own darkroom before you could even begin to see if you had captured a usable image.\u003c\/p\u003e\n\u003cp\u003eNo more. Telescope mount drive accuracy has improved tremendously, electronic eyeballs have taken over guiding, and fast digital photography has taken the place of slow 35mm film.\u003c\/p\u003e\n\u003cp\u003eToday's CCD camera can have sensors as large, if not larger, than film. To compensate for the new large sensors Celestron had to push the boundaries of the Schmidt camera design and make an entirely new type of instrument. The Celestron Rowe-Ackermann Schmidt Astrograph has provided that advance in the performance of deep space imaging scopes. With it, today's amateur astrophotographers can produce results rivaling that of the best professional observatory photos of only a few short years ago.\u003c\/p\u003e\n\u003cp\u003eAs with most advances in optics, the Celestron Rowe-Ackermann Schmidt Astrograph was designed not by committee, but by two dedicated optical experts who believed things could be done better - Dave Rowe and Mark Ackermann.\u003c\/p\u003e\n\u003cp\u003eDave Rowe - amateur astronomer, telescope maker, and optical designer - studied astronomy and astrophysics at Caltech, has published more than 50 papers, and holds 15 patents. Rowe has designed and fabricated many telescopes for Celestron and PlaneWave Instruments, including PlaneWave's corrected Dall-Kirkham and CDK700 telescope. He also worked closely with Celestron engineers in the development of the unique StarSense technology.\u003c\/p\u003e\n\u003cp\u003eMark Ackermann - amateur astronomer and experienced optical designer - earned a BS in mathematics and physics from the United States Air Force Academy, an MS in solid state physics, and a PhD in nonlinear optics from the University of New Mexico. He has published dozens of papers on optical telescope design and holds six US patents related to optical systems.\u003c\/p\u003e\n\u003cp\u003eEngineered as a complete astroimaging system, every component of the Celestron Rowe-Ackermann Schmidt Astrograph is optimized for peak performance with CMOS, smaller CCD camers, and mirrorless cameras. Every component of the system has been designed to work together seamlessly, right down to the thickness of the glass used in the scope's fully-multicoated optical window.\u003c\/p\u003e\n\u003cp\u003eSome of the advanced features of the Celestron 8\" RASA includes mirror locks hold your precise focus. A quiet high-output 12V internal MagLev fan on the rear cell reduces cooldown time and provides optimal airflow through the dust filtered 24.7\" long optical tube. Naturally, industry leading StarBright XLT optical multicoatings are standard equipment for the highest possible light throughput. A Losmandy-style \"D-plate\" dovetail is standard. The back focus with the included camera adapters is 25mm.\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eIncludes Two Must-have RASA 8\" Imaging Filters\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eAlong with the RASA 8\" optical tube, this kit also includes the\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.celestron.com\/products\/h-alpha-h-beta-oiii-imaging-filter-rowe-ackermann-schmidt-astrograph-rasa-8?_pos=2\u0026amp;_sid=1a99e2029\u0026amp;_ss=r\"\u003eH-alpha H-beta OIII Imaging Filter\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003eand the\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.celestron.com\/products\/light-pollution-imaging-filter-rowe-ackermann-schmidt-astrograph-rasa-8?_pos=3\u0026amp;_sid=1a99e2029\u0026amp;_ss=r\"\u003eLight Pollution Imaging Filter\u003c\/a\u003e. This kit maximizes your RASA 8\" telescope's potential to capture stunning images under any sky conditions, ensuring precise targeting of specific celestial objects and optimal light transmission.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLight Pollution Imaging Filter\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e- This broadband filter effectively blocks specific wavelengths of artificial light while allowing the desired wavelengths of light emitted by celestial objects to pass through. When you add this filter to your RASA, you'll see vibrant, detailed celestial objects that \"pop\" against a dark sky background with excellent overall contrast. This filter blocks light from some of the most common sources of artificial and natural light pollution between 400 and 700 nm (i.e., the visible spectrum), including high- and low-pressure sodium-vapor streetlights, mercury-vapor streetlights, and natural airglow caused by oxygen in the atmosphere.\u003cbr\u003e\u003cbr\u003eUnlike some light pollution filters, Celestron's filter blocks only specific areas of the spectrum instead of wide regions. This helps to maintain image brightness and color balance. In addition, particular wavelengths associated with emission nebulae, such as H-α (656nm), H-β (486nm), OIII (496nm and 501nm), and SII (672nm), are highly transmitted, ensuring minimal loss of image brightness for those objects.\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cimg alt=\"Light Pollution Filter, RASA 8\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1935\/4371\/files\/91079_RASA_8_Imaging_Kit_09_480x480.jpg?v=1709168591\"\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eH-alpha H-beta OIII (Hα-Hβ-OIII) Imaging Filter –\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eThe specialized Hα-Hβ-OIII Imaging Filter, also known as the Nebula Filter, is a narrowband filter that allows very high transmission of select wavelengths of light from emission nebulae while blocking the rest of the spectrum. You'll immediately notice much higher contrast in your images, even from your light-polluted backyard! And since the transmission at the critical wavelengths is so high, the nebulae are not dimmed—only the background is made blacker.\u003c\/p\u003e\n\u003cp\u003eThe Hα-Hβ-OIII Imaging Filter is perfect for imaging emission nebulae like the North America Nebula (NGC 7000), Lagoon Nebula (M8), Orion Nebula (M42), and the Carina Nebula (NGC 3372). The transmission spectrum for the Hα-Hβ-OIII Imaging Filter is 85% or greater at key wavelengths (486nm, 496nm\/501nm, 656nm) and less than 0.5% transmission elsewhere. And while other nebula filters can't keep up with RASA's fast optics and end up blocking some of the the wrong wavelengths, this filter is engineered to pair perfectly with this ultra-fast f\/2 system.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"H-Alpha, H-Beta, OIII Imaging Filter\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1935\/4371\/files\/91079_RASA_8_Imaging_Kit_10_480x480.jpg?v=1709168594\"\u003e\u003c\/p\u003e\n\u003cp\u003eBoth the Light Pollution Filter and the Hα-Hβ-OIII Imaging Filter are custom-engineered to work with RASA 8, so they won't block any of the \"good\" wavelengths, specifically targeting light pollution and other undesired wavelengths. The filters fit directly into the internal filter mount in RASA 8's front lens cell, where the optical window normally mounts. To use a filter, you first remove and replace the clear window with the desired filter. Since you are not introducing new layers of glass into the system when you swap out the window with the filter, you maintain RASA's exacting performance.\u003c\/p\u003e\n\u003cp\u003eEach filter has a plastic storage case to safely store the filter or the optical window that came with your RASA when not in use. You will also receive a spectral transmission graph unique to each individual filter, verifying its performance.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable class=\"compatibility-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eCamera\u003c\/th\u003e\n\u003cth\u003eCompatible with RASA 8?\u003c\/th\u003e\n\u003cth\u003eAdapter required\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAstronomical CMOS\/CCD camera with C-mount\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eC-mount adapter (included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAstronomical CMOS\/CCD camera with M42-thread mount\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eM42 adapter (included) with M42 extension tubes (not included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAstronomical CMOS\/CCD camera with other mount\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eCustom camera adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCanon mirrorless with APS-C sensor\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-of-canon-mirrorless-cameras.html\" target=\"_blank\"\u003eCanon mirrorless adapter\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e(sold separately)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSony mirrorless with APS-C sensor\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-for-sony-mirrorless-camera.html\" target=\"_blank\"\u003eSony mirrorless adapter\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e(sold separately)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCanon mirrorless with full frame (42mm) sensor\u003c\/td\u003e\n\u003ctd\u003eYes, but not optimized across the full sensor\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-of-canon-mirrorless-cameras.html\" target=\"_blank\"\u003eCanon mirrorless adapter\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e(sold separately)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSony mirrorless with full frame (42mm) sensor\u003c\/td\u003e\n\u003ctd\u003eYes, but not optimized across the full sensor\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-for-sony-mirrorless-camera.html\" target=\"_blank\"\u003eSony mirrorless adapter\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomics.com\/rasa-8-camera-adapter-for-sony-mirrorless-camera.html\" target=\"_blank\"\u003e(sold separately)\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDSLR\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003ctd\u003e--\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003ch2\u003eTech Details: \u003c\/h2\u003e\n\u003ctable id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAperture\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e400mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e17 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMotorized Controls\u003c\/th\u003e\n\u003ctd class=\"data\"\u003en\/a\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e17 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical Coatings\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eStarbright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e.68 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSupplied Eyepiece\u003c\/th\u003e\n\u003ctd class=\"data\"\u003en\/a\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eSchmidt-Cassegrain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBack Focus\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSupplied Accessories: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eM42 camera adapter, C-thread camera adapter, fan battery pack\u003c\/span\u003e\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":41455321972809,"sku":"91079","price":2599.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/image_86dcc69a-532a-422f-812c-ffa7e1f75127.jpg?v=1717052507"},{"product_id":"sky-watcher-quattro-150p-imaging-newtonian","title":"Sky-Watcher Quattro 150P Imaging Newtonian S11205","description":"\u003cp data-start=\"237\" data-end=\"293\" class=\"\"\u003e\u003cstrong data-start=\"237\" data-end=\"293\"\u003eSky-Watcher Quattro 150P Imaging Newtonian Reflector\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"295\" data-end=\"811\" class=\"\"\u003eThe Sky-Watcher Quattro 150P is a fast, precision-engineered Newtonian reflector designed from the ground up for astrophotography. With its f\/4 optical system, premium Crayford focuser, and included coma corrector, the Quattro 150P delivers wide-field, high-contrast images with pinpoint stars—right out of the box. Whether you’re stepping into deep-sky imaging for the first time or adding a lightweight, fast OTA to your imaging toolkit, this 6\" astrograph offers a compelling combination of performance and value.\u003c\/p\u003e\n\u003chr data-start=\"813\" data-end=\"816\" class=\"\"\u003e\n\u003ch3 data-start=\"818\" data-end=\"863\" class=\"\"\u003ef\/4 Parabolic Optics for Deep-Sky Imaging\u003c\/h3\u003e\n\u003cp data-start=\"865\" data-end=\"1164\" class=\"\"\u003eAt the heart of the Quattro 150P is a 150mm parabolic primary mirror, delivering a fast 600mm focal length at f\/4. This speed is ideal for capturing faint nebulae, distant galaxies, and rich star fields with shorter exposures—perfect for maximizing clear skies and minimizing total integration time.\u003c\/p\u003e\n\u003cp data-start=\"1166\" data-end=\"1474\" class=\"\"\u003eUnlike spherical mirrors found in budget reflectors, the Quattro’s parabolic primary eliminates spherical aberration for sharp, focused stars across the field. Enhanced aluminum coatings improve light throughput and contrast, helping faint structures stand out with clarity, especially in narrowband imaging.\u003c\/p\u003e\n\u003cp data-start=\"1476\" data-end=\"1741\" class=\"\"\u003eComa, inherent in fast Newtonians, is corrected by the included Sky-Watcher Quattro coma corrector\/reducer. This optical accessory flattens the field and eliminates edge distortions, giving you sharp stars from corner to corner even on APS-C and full-frame sensors.\u003c\/p\u003e\n\u003chr data-start=\"1743\" data-end=\"1746\" class=\"\"\u003e\n\u003ch3 data-start=\"1748\" data-end=\"1803\" class=\"\"\u003eDurable Aluminum Tube with Premium Crayford Focuser\u003c\/h3\u003e\n\u003cp data-start=\"1805\" data-end=\"2188\" class=\"\"\u003eThe optical tube is built from rolled aluminum and finished in Sky-Watcher’s signature high-gloss black diamond livery. Weighing approximately 12.6 pounds (5.7 kg), the Quattro 150P is light enough for most medium-duty mounts like the HEQ5, EQ6-R, or similar class equatorials. Its compact form factor makes it ideal for portable rigs and field setups without compromising stability.\u003c\/p\u003e\n\u003cp data-start=\"2190\" data-end=\"2535\" class=\"\"\u003eFocusing is handled by an 11:1 dual-speed 2\" Crayford-style focuser. This rack-free design ensures smooth, backlash-free motion—essential for critical focus in imaging applications. The 11:1 micro-focus knob provides ultra-fine control for nailing focus with high-resolution sensors or using tools like a Bahtinov mask or electronic focus motor.\u003c\/p\u003e\n\u003cp data-start=\"2537\" data-end=\"2695\" class=\"\"\u003eCompression ring adapters for both 2\" and 1.25\" accessories are included, allowing secure and scratch-free mounting of your camera, filter wheel, or diagonal.\u003c\/p\u003e\n\u003chr data-start=\"2697\" data-end=\"2700\" class=\"\"\u003e\n\u003ch3 data-start=\"2702\" data-end=\"2734\" class=\"\"\u003eImaging-Ready Out of the Box\u003c\/h3\u003e\n\u003cp data-start=\"2736\" data-end=\"3112\" class=\"\"\u003eUnlike many astrographs that require additional investment in optical correctors, the Quattro 150P comes standard with Sky-Watcher’s dedicated \u003cstrong data-start=\"2879\" data-end=\"2905\"\u003ecoma corrector\/reducer\u003c\/strong\u003e. This corrector not only flattens the image field but also acts as a reducer, improving your light-gathering efficiency and expanding the field of view—perfect for large nebulae and mosaic-friendly targets.\u003c\/p\u003e\n\u003cp data-start=\"3114\" data-end=\"3351\" class=\"\"\u003eThe scope offers generous back focus for a wide variety of imaging configurations, including filter wheels, off-axis guiders, and cooled CMOS cameras. With proper spacing, achieving flat, coma-free images is straightforward and reliable.\u003c\/p\u003e\n\u003chr data-start=\"3353\" data-end=\"3356\" class=\"\"\u003e\n\u003ch3 data-start=\"3358\" data-end=\"3382\" class=\"\"\u003eIncluded Accessories\u003c\/h3\u003e\n\u003cp data-start=\"3384\" data-end=\"3491\" class=\"\"\u003eSky-Watcher has thoughtfully equipped the Quattro 150P with a suite of accessories to help you get started:\u003c\/p\u003e\n\u003cul data-start=\"3493\" data-end=\"3977\"\u003e\n\u003cli data-start=\"3493\" data-end=\"3578\" class=\"\"\u003e\n\u003cp data-start=\"3495\" data-end=\"3578\" class=\"\"\u003e\u003cstrong data-start=\"3495\" data-end=\"3540\"\u003e11:1 dual-speed 2\" Crayford-style focuser\u003c\/strong\u003e for precise, backlash-free focusing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3579\" data-end=\"3655\" class=\"\"\u003e\n\u003cp data-start=\"3581\" data-end=\"3655\" class=\"\"\u003e\u003cstrong data-start=\"3581\" data-end=\"3607\"\u003eComa corrector\/reducer\u003c\/strong\u003e for flat, sharp stars across the entire field\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3656\" data-end=\"3736\" class=\"\"\u003e\n\u003cp data-start=\"3658\" data-end=\"3736\" class=\"\"\u003e\u003cstrong data-start=\"3658\" data-end=\"3690\"\u003e22mm Ultra Wide 70° eyepiece\u003c\/strong\u003e for immersive visual observing when desired\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3737\" data-end=\"3798\" class=\"\"\u003e\n\u003cp data-start=\"3739\" data-end=\"3798\" class=\"\"\u003e\u003cstrong data-start=\"3739\" data-end=\"3773\"\u003e1.25\" and 2\" eyepiece adapters\u003c\/strong\u003e with compression rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3799\" data-end=\"3892\" class=\"\"\u003e\n\u003cp data-start=\"3801\" data-end=\"3892\" class=\"\"\u003e\u003cstrong data-start=\"3801\" data-end=\"3846\"\u003e6x30 straight-through optical finderscope\u003c\/strong\u003e for easy star-hopping and initial alignment\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3893\" data-end=\"3977\" class=\"\"\u003e\n\u003cp data-start=\"3895\" data-end=\"3977\" class=\"\"\u003e\u003cstrong data-start=\"3895\" data-end=\"3937\"\u003eTube rings with V-style dovetail plate\u003c\/strong\u003e, compatible with most standard mounts\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3979\" data-end=\"4228\" class=\"\"\u003eAlthough this scope is primarily engineered for imaging, the included 22mm 70° eyepiece offers wide-field views for visual use. With the correct extension tube or diagonal, the Quattro 150P doubles as a capable visual telescope for casual observing.\u003c\/p\u003e\n\u003chr data-start=\"4230\" data-end=\"4233\" class=\"\"\u003e\n\u003ch3 data-start=\"4235\" data-end=\"4248\" class=\"\"\u003eIdeal For\u003c\/h3\u003e\n\u003cp data-start=\"4250\" data-end=\"4298\" class=\"\"\u003eThe Sky-Watcher Quattro 150P is best suited for:\u003c\/p\u003e\n\u003cul data-start=\"4300\" data-end=\"4600\"\u003e\n\u003cli data-start=\"4300\" data-end=\"4350\" class=\"\"\u003e\n\u003cp data-start=\"4302\" data-end=\"4350\" class=\"\"\u003eEntry-level to intermediate astrophotographers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4351\" data-end=\"4428\" class=\"\"\u003e\n\u003cp data-start=\"4353\" data-end=\"4428\" class=\"\"\u003eWide-field deep-sky imaging of nebulae, galaxies, and large star clusters\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4429\" data-end=\"4468\" class=\"\"\u003e\n\u003cp data-start=\"4431\" data-end=\"4468\" class=\"\"\u003eDSLR and cooled CMOS imaging setups\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4469\" data-end=\"4529\" class=\"\"\u003e\n\u003cp data-start=\"4471\" data-end=\"4529\" class=\"\"\u003eLightweight and portable rigs for travel or backyard use\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4530\" data-end=\"4600\" class=\"\"\u003e\n\u003cp data-start=\"4532\" data-end=\"4600\" class=\"\"\u003eUsers seeking a complete imaging OTA with coma correction included\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4602\" data-end=\"4605\" class=\"\"\u003e\n\u003ch3 data-start=\"4607\" data-end=\"4625\" class=\"\"\u003eFinal Thoughts\u003c\/h3\u003e\n\u003cp data-start=\"4627\" data-end=\"4968\" class=\"\"\u003eWith a fast f\/4 optical system, parabolic mirrors, and a coma corrector included right in the box, the Sky-Watcher Quattro 150P Imaging Newtonian offers exceptional value and versatility for astrophotographers. Its sharp optics, premium focuser, and generous accessory package make it one of the best turnkey imaging reflectors in its class.\u003c\/p\u003e\n\u003cp data-start=\"4970\" data-end=\"5183\" class=\"\"\u003eIf you're looking for an efficient, well-built, and thoroughly capable imaging OTA that doesn’t require a laundry list of upgrades to perform, the Quattro 150P deserves a spot in your observatory or imaging setup.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eS11205\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e050234112055\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical Info\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eNewtonian\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Coatings\u003c\/td\u003e\n\u003ctd\u003eProtected Aluminum coatings with 94% reflectivity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eBorosilicate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e150mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eF\/Ratio\u003c\/td\u003e\n\u003ctd\u003e3.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length (mm)\u003c\/td\u003e\n\u003ctd\u003e600\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Diameter\u003c\/td\u003e\n\u003ctd\u003e64mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Obstruction (by diameter)\u003c\/td\u003e\n\u003ctd\u003e42%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Obstruction by Area\u003c\/td\u003e\n\u003ctd\u003e18%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eObservational Info\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDawes Limit\u003c\/td\u003e\n\u003ctd\u003e0.77\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRayleigh Limit\u003c\/td\u003e\n\u003ctd\u003e0.93\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Mag.\u003c\/td\u003e\n\u003ctd\u003e13.36\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Magnification\u003c\/td\u003e\n\u003ctd\u003e21x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Magnification\u003c\/td\u003e\n\u003ctd\u003e295x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering (compared to next size down)\u003c\/td\u003e\n\u003ctd\u003e40% (compared to 5\" telescope)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eGeneral Info\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2\" Dual Speed Crayford\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Length (Retract\/Ext.)\u003c\/td\u003e\n\u003ctd\u003e22\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e7.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight (with accessories)\u003c\/td\u003e\n\u003ctd\u003e12.6 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eAccessories\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Finder\u003c\/td\u003e\n\u003ctd\u003e6x30 Finder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Diagonal\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Accessories\u003c\/td\u003e\n\u003ctd\u003eMounting Rings\/Dovetail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Eyepieces\u003c\/td\u003e\n\u003ctd\u003e22mm 70 degree 1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Case\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrector\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!----\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":41586845777993,"sku":"S11205","price":665.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/Quattro150_Main_1800x1800_76ca6d0e-445f-4f0e-aa30-2cb6b733e63d.webp?v=1720203248"},{"product_id":"astro-tech-at86edq-f-7-quad-refractor","title":"Astro-Tech AT86EDQ f\/7 Quad Refractor","description":"\u003cp\u003eAlan Dyer reviewed the AT86EDQ for \u003cem\u003eSky \u0026amp; Telescope\u003c\/em\u003e (July 2025) and called it one of his picks for a desert-island telescope — the one scope he'd take if he could only take one. That's a statement worth unpacking, because this is an 86mm refractor. It's not trying to be the biggest aperture on the field. What it's trying to be is the most versatile small refractor you can buy, and it gets there by doing something most small refractors don't: delivering a flat, corrected field straight from the focuser, with no external flattener required.\u003c\/p\u003e\n\n\u003cp\u003eThe AT86EDQ is a four-element, two-group quadruplet. The front group is an apochromatic triplet with one ED element for color correction. Behind it, a separate internal group containing a second ED element flattens the field. The result is a 44mm corrected image circle — flat, round stars from the center to the corners of a full-frame sensor — with nothing between the focuser and your camera but the included photographic extension tube. No separate field flattener to buy. No spacing to calculate. No wondering whether a generic corrector is well-matched to your scope's optical system. It's done.\u003c\/p\u003e\n\n\u003cp\u003eAt 86mm of aperture, 602mm f\/7, and 18.2 inches retracted, the AT86EDQ is genuinely grab-and-go. It fits on lightweight mounts. It fits in overhead airline compartments. It sets up in minutes and delivers images and views that belie its compact size.\u003c\/p\u003e\n\n\u003ch3\u003eS\u0026amp;T Tested\u003c\/h3\u003e\n\n\u003cp\u003eAlan Dyer's \u003cem\u003eSky \u0026amp; Telescope\u003c\/em\u003e review (July 2025) put the AT86EDQ through rigorous visual and photographic testing. His star test at 200× on Capella showed a well-defined central Airy disc with a clean first diffraction ring — he noted the optics passed the star test by a margin that matched or exceeded any telescope he'd reviewed in recent years. Visually, he found no blue or magenta halo from chromatic aberration — the optics were clean on planets, bright stars, and wide-field deep-sky targets alike. At f\/7 on a Canon R5 (full-frame, 45 megapixels), the internal flattener delivered sharp stars to the corners of the frame with no astigmatism or color flaring. The quad design also proved forgiving of backfocus spacing — within a couple of millimeters either direction, Dyer saw no significant degradation.\u003c\/p\u003e\n\n\u003ch3\u003eThe Quad Optical Design\u003c\/h3\u003e\n\n\u003cp\u003eThe AT86EDQ uses a four-lens, two-group optical system. The front group is an apochromatic triplet with one ED element — this handles color correction and primary image formation. Behind it, a separate group containing a second ED element flattens the focal plane. All lens surfaces carry fully multicoated antireflection coatings matched to their specific glass types. The blackened tube interior has five knife-edge baffles, and the focuser includes additional ribs for stray-light suppression.\u003c\/p\u003e\n\n\u003cp\u003eThe two groups are designed as a matched system: the triplet delivers a sharp, color-free image, and the flattener ensures that image lands flat across sensors up to full frame. This is not a triplet with a generic corrector bolted on — the field-flattening group is integral to the optical design, which is why the correction is as clean as it is.\u003c\/p\u003e\n\n\u003ch3\u003eBuilt-In Flat Field — No Flattener Required\u003c\/h3\u003e\n\n\u003cp\u003eThis is the defining advantage of the EDQ design. With a conventional triplet or doublet, the focal plane curves. Stars in the center are sharp, but stars toward the edges elongate as the curved focal surface diverges from the flat sensor. An external field flattener corrects this — but it's a separate purchase, a separate connection, and a separate spacing calculation.\u003c\/p\u003e\n\n\u003cp\u003eThe AT86EDQ eliminates that step. The 44mm corrected image circle covers full-frame sensors (36×24mm) with round stars from center to corners. Alan Dyer's imaging tests on a Canon R5 confirmed excellent field illumination at f\/7 — only gradual, minimal vignetting across the frame. Bolt the camera to the extension tube and shoot.\u003c\/p\u003e\n\n\u003cp\u003eIf you want a faster system, the dedicated ATEDQR 0.8× reducer (sold separately) drops the AT86EDQ from 602mm f\/7 to approximately 482mm f\/5.6 — almost a full stop faster, shorter exposures, and a wider field. The reducer attaches directly to the focuser's M69 threads (the step-down ring is removed first). Dyer's tests showed the reducer preserved the flat field well, with only minor elongation visible at the extreme corners at pixel-peeping magnification.\u003c\/p\u003e\n\n\u003ch3\u003eUnder the Night Sky\u003c\/h3\u003e\n\n\u003cp\u003e86mm of aperture in a well-corrected refractor is more capable than many people expect. The resolution limit is 1.35 arc seconds, and the clean optics deliver high-contrast views that punch above their aperture class.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMoon:\u003c\/strong\u003e The AT86EDQ shows crisp lunar detail — crater walls, central peaks, and the larger rilles are well-defined. At 86× (7mm eyepiece), you're seeing the full disc with sharp detail across the field. Push to 150× with a 4mm eyepiece and the terminator comes alive — Copernicus shows terraced walls, Plato's floor shows texture, and the Straight Wall is a clean, sharp shadow line.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003ePlanets:\u003c\/strong\u003e At 150× with an Astro-Tech 4mm 82° UWA, Dyer reported Mars showing the North Polar Cap and Syrtis Major clearly during the January 2025 planetary alignment. Jupiter's dark belts showed hints of fine structure, and the Galilean moons were tight points of light. Venus presented a clean white crescent phase with no false color — none of the blue or magenta halo that lesser optics produce. Saturn's Cassini Division is visible at moderate power under steady seeing, and the planet's disc shows subtle banding.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDouble stars:\u003c\/strong\u003e With a 1.35 arc second Dawes limit, the AT86EDQ splits the classic visual doubles. Epsilon Lyrae (the Double Double) resolves at 150×. Albireo is a striking color-contrast pair at low power. Castor separates cleanly. Dyer noted that Rigel showed its 7th-magnitude companion 9.4 arc seconds from the brilliant primary — a test of contrast as much as resolution — and that Castor split cleanly into its slightly unequal components at 5.6 arc seconds.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDeep sky:\u003c\/strong\u003e The flat field is a visual advantage as well as a photographic one. Stars are sharp to the edge of the eyepiece field, which makes open clusters and Milky Way sweeping noticeably better than through a conventional refractor. Dyer paired the AT86EDQ with an Astro-Tech 20mm 100° XWA and reported sharp stars to the edges of the field across wide Milky Way vistas. M42 framed beautifully in the 3.3° field with surrounding nebulosity and clusters. The Messier open clusters — M35, M36, M37, M38, the Double Cluster — are spectacular subjects for this scope, with pinpoint stars across the field.\u003c\/p\u003e\n\n\u003ch3\u003eFor the Imager\u003c\/h3\u003e\n\n\u003cp\u003eThe AT86EDQ was designed around imaging, and the S\u0026amp;T review confirmed it delivers. At 602mm f\/7 on a Canon R5 (full-frame, 4.4-micron pixels), Dyer found no astigmatism or color flaring in the corners of the frame. The internal flattener was doing its job — flat field, round stars, clean correction.\u003c\/p\u003e\n\n\u003cp\u003eAt this focal length, the field of view on a full-frame sensor is roughly 3.4° × 2.3° — wide enough for the Orion Nebula complex, the Rosette, large open clusters, and widefield Milky Way shots. Add the 0.8× reducer and the field opens to approximately 4.2° × 2.8° at f\/5.6 — nearly a full stop faster with a significantly wider framing.\u003c\/p\u003e\n\n\u003cp\u003eThe scope includes a photographic extension tube that threads into the camera angle adjuster when you're ready to image. The extension tube provides M63, M54, and M48 thread options for connecting cameras and accessories. A set of camera adapter rings (M54 and M48 sizes) is also included, along with 0.5mm and 1mm backfocus shims for fine-tuning sensor spacing. The recommended backfocus is forgiving — Dyer tested ±2mm from the nominal spacing and saw no significant degradation at either f\/7 or f\/5.6.\u003c\/p\u003e\n\n\u003cp\u003eThe camera angle adjuster rotates a full 360° and locks with a large knob — frame your target in landscape, portrait, or any angle between without disassembling the imaging train. The focuser is compatible with electronic focusers like the ZWO EAF for remote, software-controlled focusing.\u003c\/p\u003e\n\n\u003ch3\u003eGrab-and-Go\u003c\/h3\u003e\n\n\u003cp\u003eAt 18.2 inches retracted, 22 inches with the dew shield extended, and approximately 11 pounds with rings and dovetail, the AT86EDQ is the smallest and lightest scope in the EDQ line. It rides comfortably on a ZWO AM3 or AM5, an iOptron GEM28, or any equatorial mount in that class. For visual use, a sturdy alt-az mount or a light equatorial handles it easily.\u003c\/p\u003e\n\n\u003cp\u003eThe scope fits in airline overhead compartments — not all refractors can say that. If you travel to dark sky sites or want a scope that sets up in minutes for a quick session from the backyard, the AT86EDQ's size and weight are a genuine advantage. The included cordura carry case protects it in transit.\u003c\/p\u003e\n\n\u003ch3\u003eThe Focuser\u003c\/h3\u003e\n\n\u003cp\u003eThe AT86EDQ's 3.2\" (81mm) rack-and-pinion focuser has 85mm of travel — enough for most eyepiece and camera configurations. The right focus knob has a concentric 10:1 fine-focus knob for precise control. The focuser locks solidly with no image shift when tightened, and Dyer noted it didn't slide out of focus or slip when aimed straight up while carrying a heavy eyepiece and diagonal.\u003c\/p\u003e\n\n\u003cp\u003eThe focuser drawtube terminates in a built-in camera angle adjuster — standard equipment, not an extra-cost accessory. The drawtube has a scale marked in 1mm increments for recording focus positions. Thread options include M63, M54, and M48 via the included adapter set.\u003c\/p\u003e\n\n\u003cp\u003eThe 2\" and 1.25\" accessory holders use non-marring brass compression rings. The existing Astro-Tech 1.25\" dielectric diagonal is a good pairing for visual use — the product page recommends it specifically.\u003c\/p\u003e\n\n\u003ch3\u003eBuild and Mechanical\u003c\/h3\u003e\n\n\u003cp\u003eThe AT86EDQ is finished in matte black anodize with red-anodized focuser and camera angle adjuster appointments. Five knife-edge baffles inside the tube control stray light, and the focuser adds additional suppression ribs. The retractable dew shield slides forward 95mm for dew protection and stray-light control.\u003c\/p\u003e\n\n\u003cp\u003eFelt-lined hinged split mounting rings with M6×1 thread mounting holes come standard, along with a Vixen-style dovetail and a handle with a mini Vixen saddle plate. The rings accept a Losmandy-style D-plate dovetail (sold separately) for heavier mounts. A single Synta-standard finderscope shoe is included on the focuser housing.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eAT86EDQ optical tube assembly\u003c\/li\u003e\n  \u003cli\u003eFelt-lined hinged split mounting rings (pair) with M6×1 mounting holes\u003c\/li\u003e\n  \u003cli\u003eCarrying handle with mini Vixen saddle plate\u003c\/li\u003e\n  \u003cli\u003eVixen-style dovetail plate (24cm)\u003c\/li\u003e\n  \u003cli\u003ePhotographic extension tube (M63, M54, M48 threads)\u003c\/li\u003e\n  \u003cli\u003eCamera adapter ring set (M54 and M48 sizes)\u003c\/li\u003e\n  \u003cli\u003eBackfocus shims (0.5mm and 1mm)\u003c\/li\u003e\n  \u003cli\u003e2\" accessory holder with brass compression ring\u003c\/li\u003e\n  \u003cli\u003e1.25\" accessory adapter with brass compression ring\u003c\/li\u003e\n  \u003cli\u003eRetractable dew shield\u003c\/li\u003e\n  \u003cli\u003eFinderscope mounting shoe (Synta-standard)\u003c\/li\u003e\n  \u003cli\u003eSlip-on metal dust cap\u003c\/li\u003e\n  \u003cli\u003eCordura nylon carry case\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCommunity Says\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003e\"Build quality is excellent. Baffling of both the OTA and focuser assembly is well executed. Quite impressive actually. The focuser is beefy and...\"\u003c\/strong\u003e\u003cbr\u003e\n— \u003ca href=\"https:\/\/www.cloudynights.com\/forums\/topic\/958297-at86edq-f7-quad\/?do=findComment\u0026amp;comment=14032147\"\u003eCloudy Nights AT86EDQ discussion\u003c\/a\u003e. This owner logged over 80 hours behind the AT86EDQ for visual observing and found it impressive on solar, Venus, and planets.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e\"On open clusters, it delivered pinpoint stars edge to edge.\"\u003c\/strong\u003e\u003cbr\u003e\n— \u003ca href=\"https:\/\/www.cloudynights.com\/forums\/topic\/973250-astro-tech-at86edq-quad-f7-owners-thread\/?do=findComment\u0026amp;comment=14282175\"\u003eCloudy Nights AT86EDQ Owners Thread\u003c\/a\u003e. This owner used the scope visually on Scorpius and Sagittarius summer targets and also noted: \"I cannot see that it gives up anything to my FCD-100 or FPL-53 triplets.\"\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e\"I have used this scope quite a bit and have found it to be excellent. The build quality is outstanding and the optics are quite good. With and without the reducer, the stars are sharp all the way to the edge of an aps-c sized sensor.\"\u003c\/strong\u003e\u003cbr\u003e\n— \u003ca href=\"https:\/\/www.cloudynights.com\/forums\/topic\/958297-at86edq-f7-quad\/?do=findComment\u0026amp;comment=14032103\"\u003eCloudy Nights AT86EDQ discussion\u003c\/a\u003e. This owner tested the AT86EDQ both visually and photographically.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e\"Sharp and clean and I could see faint bandings on the disc of Saturn, something I'm not sure I've noticed on the 14-inch dob.\"\u003c\/strong\u003e\u003cbr\u003e\n— \u003ca href=\"https:\/\/www.cloudynights.com\/forums\/topic\/973250-astro-tech-at86edq-quad-f7-owners-thread\/?do=findComment\u0026amp;comment=14289986\"\u003eCloudy Nights AT86EDQ Owners Thread\u003c\/a\u003e. This owner came to the AT86EDQ from a 14\" Dobsonian and was struck by the refractor's planetary contrast.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuadruplet optical system with two ED elements.\u003c\/strong\u003e Four-lens, two-group design: an apochromatic ED triplet objective plus a separate internal ED field-flattening group. Color correction and flat field are built into the optical system. S\u0026amp;T star test: at least ¼-wave, with no false color on planets or bright stars.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-in flat field to full frame — no external flattener required.\u003c\/strong\u003e The internal ED field-flattening group delivers a 44mm corrected image circle. Round stars from center to corners on full-frame sensors, confirmed by S\u0026amp;T testing on a Canon R5.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e86mm aperture at 602mm f\/7 — grab-and-go size.\u003c\/strong\u003e 18.2\" retracted, ~11 lbs with rings. Fits on lightweight mounts and in airline overhead compartments. Sets up in minutes.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eS\u0026amp;T reviewed (July 2025).\u003c\/strong\u003e Alan Dyer: \"one of my picks for a desert-island telescope.\" Passed the star test by a margin matching or exceeding any scope recently reviewed.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eForgiving backfocus spacing.\u003c\/strong\u003e S\u0026amp;T testing showed ±2mm from nominal had no significant effect on image quality at either f\/7 or f\/5.6. Less fiddling on setup night.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible with the ATEDQR 0.8× reducer.\u003c\/strong\u003e Add the dedicated reducer (sold separately) to drop from 602mm f\/7 to ~482mm f\/5.6 — almost a full stop faster, wider field, shorter exposures.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3.2\" dual-speed rack-and-pinion focuser with 10:1 fine focus.\u003c\/strong\u003e 85mm of travel, solid lock with no image shift, mm-scale drawtube markings. EAF compatible.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-in camera angle adjuster.\u003c\/strong\u003e 360° rotation standard — frame targets in any orientation without disassembling the imaging train.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePhotographic extension tube and adapter set included.\u003c\/strong\u003e M63, M54, and M48 thread options. Camera adapter rings and backfocus shims included in the box — not sold separately.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFive knife-edge baffles plus focuser suppression ribs.\u003c\/strong\u003e Thorough internal stray-light control for high contrast on planets and deep sky.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eObserving Tip\u003c\/h3\u003e\n\n\u003cp\u003eThe AT86EDQ at 602mm f\/7 with a wide-field eyepiece is one of the best open-cluster scopes you can own. Drop in a 20mm 100° eyepiece (30×, 3.3° true field) and sweep through the Milky Way from Cygnus to Sagittarius. The flat field means every star in that 3.3° field is a point — not a smear — from center to edge. Open clusters pop against the background in a way that scopes with curved fields don't quite match. For M35, M36, M37, M38, and the Double Cluster, this is hard to beat at any price.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eDo I need a separate field flattener?\u003c\/strong\u003e\u003cbr\u003e\nNo. The AT86EDQ has a built-in ED field-flattening group that delivers a flat, corrected field across full-frame sensors. No external flattener needed — this is one of the primary advantages of the quad design. The only optional optic is the ATEDQR 0.8× reducer if you want a faster focal ratio and wider field.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat mount do I need?\u003c\/strong\u003e\u003cbr\u003e\nAt ~11 lbs with rings and dovetail, the AT86EDQ is light enough for mounts like the ZWO AM3 or AM5, iOptron GEM28, or a Sky-Watcher HEQ5. For visual use, a sturdy alt-az mount handles it well. This is a genuinely portable scope — it doesn't demand a heavy mount.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow does this compare to the AT90EDX or AT90CFT?\u003c\/strong\u003e\u003cbr\u003e\nDifferent designs for different priorities. The AT90EDX\/CFT is a 90mm f\/6 FCD-100 triplet with a guaranteed .95 Strehl ratio — premium optics with the highest-grade glass. But it needs a separate field flattener for imaging. The AT86EDQ is a quad with a built-in flat field — you give up 4mm of aperture and the Strehl guarantee, but you gain a simpler imaging train and no external flattener. Both are excellent visual scopes. CN users who own both report comparable visual performance on planets and double stars.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I use this just for visual observing?\u003c\/strong\u003e\u003cbr\u003e\nAbsolutely. Multiple CN owners use the AT86EDQ exclusively for visual and report excellent results on planets, double stars, open clusters, and deep sky. The flat field is a visual advantage too — stars are sharp to the edge of wide-field eyepieces, which makes sweeping and cluster observing noticeably better.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow does the AT86EDQ compare to the AT106EDQ and AT126EDQ?\u003c\/strong\u003e\u003cbr\u003e\nSame optical design in three aperture sizes, all f\/7. The AT86EDQ (86mm, 602mm, ~11 lbs) is the grab-and-go — lightest, shortest, airline-capable. The AT106EDQ (106mm, 742mm, ~14 lbs) is the mid-size option with 52% more light grasp. The AT126EDQ (126mm, 882mm, ~17.7 lbs) is the big one — most aperture and resolution, heaviest mount requirements. All share the ATEDQR 0.8× reducer and the built-in flat field.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat did S\u0026amp;T note as drawbacks?\u003c\/strong\u003e\u003cbr\u003e\nAlan Dyer noted three things: the focuser tube itself doesn't rotate (the camera angle adjuster handles rotation instead, but lacks index markings for repeatable positioning), and threading 48mm filters into the adapter ring was difficult. These are minor mechanical issues — the optics and optical performance drew no complaints.\u003c\/p\u003e\n\n\u003ch3\u003eAccessories\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eATEDQR 0.8× Reducer (sold separately):\u003c\/strong\u003e Drops the AT86EDQ from 602mm f\/7 to ~482mm f\/5.6. Almost a full stop faster, wider field, full-frame coverage. Threads directly to the focuser's M69 threads (remove the step-down ring first).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eT-ring for your camera mount:\u003c\/strong\u003e Required for connecting DSLR and mirrorless cameras. Dedicated CMOS\/CCD astronomy cameras typically have 48mm T-threads built in and connect directly via the included adapter rings.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAstro-Tech 1.25\" Dielectric Diagonal (AT1D):\u003c\/strong\u003e Recommended on the product page for visual use. High-reflectivity dielectric coating.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinder or guide scope:\u003c\/strong\u003e The AT86EDQ ships with one finderscope shoe. Add a red-dot finder for visual use or a guide scope for autoguided imaging. Consider a second shoe if you want both.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eZWO EAF electronic focuser:\u003c\/strong\u003e Compatible with the AT86EDQ's focuser for motorized, software-controlled focusing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFinal Thoughts\u003c\/h3\u003e\n\n\u003cp\u003eThe AT86EDQ is the smallest flat-field quad in the Astro-Tech line — 86mm of aperture at 602mm f\/7 with a built-in ED field flattener that delivers round stars across full-frame sensors without an external corrector. Alan Dyer put it through a full S\u0026amp;T review and found optics that matched or exceeded anything he'd tested recently, with a star test that was textbook-clean and imaging performance that held up on a 45-megapixel full-frame camera. The CN community calls it excellent for visual, excellent for imaging, and built like it means business. At 18.2 inches retracted and roughly 11 pounds, it goes where you go — backyard, dark sky site, or the overhead bin of a 737. If you want one refractor that does visual and imaging without compromise and without needing a separate flattener, and you want to actually carry it out to the backyard on a weeknight, this is the scope that earns that job.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eAstro-Tech AT86EDQ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eOptical Design\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eQuadruplet (4 lens \/ 2 group) with built-in ED field flattener\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eAperture\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e86mm (3.38\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eFocal Length\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e602mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eED Elements\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e2 (one in triplet objective, one in field flattener group)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eCorrected Image Circle\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e44mm (full frame and smaller)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eCoatings\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eFully multicoated on all air-to-glass surfaces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eInternal Baffling\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e5 knife-edge baffles plus focuser suppression ribs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eResolution (Dawes Limit)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e1.35 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eVisual Limiting Magnitude\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e12.37\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eHighest Useful Magnification\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e169×\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eFocuser\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e3.2\" (81mm) dual-speed rack-and-pinion, 10:1 fine focus ratio\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eFocuser Travel\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eFocuser Threads\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eM69 (camera rotator), M63, M54, M48 (via extension tube and adapters)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eCamera Angle Adjuster\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eBuilt-in, 360° rotation with locking knob\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eAccessory Holders\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e2\" and 1.25\" with non-marring brass compression rings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eDew Shield\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eRetractable (self-storing), extends 95mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eOTA Length (retracted)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e18.2\" (46cm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eOTA Length (extended)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e22\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eWeight (with rings, dovetail, handle)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e11.2 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eHeaviest Single Component\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e9.5 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eTube Finish\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eMatte black anodize with red-anodized focuser and appointments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eMounting Rings\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eFelt-lined hinged split rings with M6×1 mounting holes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eDovetail\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eVixen-style, 24cm (Losmandy D-plate compatible via mounting holes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eCompatible Reducer\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eATEDQR 0.8× (602mm f\/7 → ~482mm f\/5.6)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eCarry Case\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eCordura nylon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eWarranty\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":41598307500105,"sku":"AT86EDQ","price":1399.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/AT86EDQ_1-9488.jpg?v=1731697669"},{"product_id":"astro-tech-at106edq-f-7-quad-refractor","title":"Astro-Tech AT106EDQ f\/7 Quad Refractor","description":"\u003cp\u003eYou buy a refractor for imaging, and the first thing you learn is that you need a field flattener. Then you learn that the flattener has to match your scope's focal length and field curvature, and the spacing from flattener to sensor has to be precise, and the whole assembly adds weight and length and one more potential source of tilt. It works — but it's a workaround for a problem that the optical system itself created.\u003c\/p\u003e\n\u003cp\u003eThe AT106EDQ builds the correction into the optical system. Four elements in two groups: an apochromatic ED triplet objective handles color correction and image formation, and a separate internal ED field-flattening group flattens the field. The result is a 44mm corrected image circle — flat, sharp, round stars from center to the corners of a full-frame sensor — with nothing between the focuser and your camera but air. No external flattener. No spacing guesswork. No adapter stack.\u003c\/p\u003e\n\u003cp\u003eAt 106mm of aperture and 742mm f\/7, the AT106EDQ sits in the middle of the EDQ line — more aperture and reach than the AT86EDQ, more portable and mount-friendly than the AT126EDQ. It's the size where you start seeing real deep-sky structure in your images and at the eyepiece, without needing a pier-mounted equatorial to carry it.\u003c\/p\u003e\n\u003ch3\u003eThe Quad Optical Design\u003c\/h3\u003e\n\u003cp\u003eThe AT106EDQ uses a four-lens, two-group optical system. The front group is an apochromatic triplet with one ED element — this controls chromatic aberration and forms the primary image. Behind it, a separate group containing a second ED element flattens the focal plane. The two groups are designed as a matched system: the triplet delivers a sharp, color-corrected image, and the flattener ensures that image lands flat across sensors up to 36×24mm.\u003c\/p\u003e\n\u003cp\u003eAll lens surfaces carry fully multicoated antireflection coatings matched to their specific glass types. The result is high light transmission, excellent contrast, and images free of the faint color halos that show up around bright stars in less-corrected optics. At f\/7, chromatic aberration is tightly controlled — bright stars are clean, the lunar limb is crisp, and planetary discs show color fidelity that does justice to what's actually there.\u003c\/p\u003e\n\u003ch3\u003eBuilt-In Flat Field — No Flattener Required\u003c\/h3\u003e\n\u003cp\u003eThis is the core advantage of the EDQ design. With a standard triplet or doublet refractor, the focal plane curves. Stars are sharp in the center but stretch toward the edges as the curved focal surface diverges from the flat chip. You add a field flattener to fix it — an extra piece of glass, an extra connection, extra spacing to get right.\u003c\/p\u003e\n\u003cp\u003eThe AT106EDQ eliminates that step. The internal ED field-flattening group is optically matched to the objective because it was designed as part of the same system — not added after the fact by a third-party manufacturer. The 44mm corrected image circle covers full-frame sensors with round stars from center to corners. Bolt the camera to the focuser and shoot.\u003c\/p\u003e\n\u003cp\u003eIf you want a faster system, the dedicated ATEDQR 0.8× reducer drops the AT106EDQ from 742mm f\/7 to approximately 594mm f\/5.6 — a 56% increase in light per pixel, shorter exposures, and a wider field. Because the field is already flat at the native focal length, the reducer's job is straightforward focal reduction rather than trying to correct and reduce simultaneously.\u003c\/p\u003e\n\u003ch3\u003eUnder the Night Sky\u003c\/h3\u003e\n\u003cp\u003e106mm of aperture in a well-corrected refractor puts you in a productive range for both visual observing and imaging. The resolution limit is 1.3 arc seconds — enough to split moderately tight doubles and resolve fine structure on the Moon and planets.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMoon:\u003c\/strong\u003e The AT106EDQ shows the Moon in impressive detail. Plato's craterlets begin to emerge under steady seeing. The Straight Wall is a clean, sharp feature at any power. Copernicus shows terraced walls and the central peak cluster. The Alpine Valley is resolved as a distinct channel, and the smaller rilles across the maria show up under good conditions at 150× and above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlanets:\u003c\/strong\u003e Jupiter shows the two main equatorial belts with internal detail — festoons, barges, and the Great Red Spot with visible structure on the best nights. Shadow transits are clean black dots. Saturn's Cassini Division is a crisp, dark gap at moderate power, and the planet's belted disc shows subtle banding. Mars at opposition shows dark surface markings and the polar cap with the clean color rendition that a well-corrected refractor delivers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDouble stars:\u003c\/strong\u003e With a 1.3 arc second Dawes limit, the AT106EDQ splits the classic doubles cleanly. Epsilon Lyrae (the Double Double) separates at 150×. Albireo is a dramatic color-contrast pair at low power. Castor splits easily. Tighter pairs like Zeta Herculis (1.4\") are within reach under steady seeing. The clean Airy discs and high contrast of a good refractor make doubles one of its best visual subjects.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDeep sky:\u003c\/strong\u003e 106mm gathers enough light to show real structure in the brighter Messier objects. M13 shows individual stars resolving across its face at 100× and above. M42 delivers the four Trapezium stars crisply with nebulosity streaming outward. M57 (the Ring Nebula) shows its annular shape clearly. Open clusters like the Double Cluster, M35, and M37 are spectacular — and the flat field means stars at the edge of the eyepiece are as sharp as those in the center. That flat field is a visual advantage too, not just an imaging one.\u003c\/p\u003e\n\u003ch3\u003eFor the Imager\u003c\/h3\u003e\n\u003cp\u003eThe AT106EDQ was designed with imaging in mind. At 742mm f\/7 with a flat field to full frame, it frames deep-sky targets at a versatile image scale — enough focal length that mid-size targets like the Crab Nebula, the Leo Triplet, and the Veil Nebula East or West arcs fill an APS-C frame with detail, and enough field of view on full frame that larger targets like the Rosette or the North America Nebula fit comfortably.\u003c\/p\u003e\n\u003cp\u003eAdd the ATEDQR 0.8× reducer and the system drops to approximately 594mm f\/5.6. The wider field frames bigger targets — M31 with both companions, the Heart and Soul complex, wide Milky Way fields — and the faster focal ratio cuts exposure times. The 56% increase in light per pixel means shorter subs or deeper signal in the same integration time.\u003c\/p\u003e\n\u003cp\u003eThe camera angle adjuster is standard equipment — rotate the camera to frame your target in landscape, portrait, or any angle in between. The focuser drawtube has a millimeter scale for recording focus positions, and the focus lock prevents shift during long exposures. The focuser is compatible with electronic focusers like the ZWO EAF for remote focusing.\u003c\/p\u003e\n\u003ch3\u003eThe Mid-Size Sweet Spot\u003c\/h3\u003e\n\u003cp\u003eThe EDQ line spans three apertures: 86mm, 106mm, and 126mm. The AT86EDQ is the grab-and-go — light, compact, airline-friendly. The AT126EDQ is the heavyweight — maximum aperture and resolution, but 17.67 pounds on the mount. The AT106EDQ sits between them, and that middle position is its strength.\u003c\/p\u003e\n\u003cp\u003eAt 14.33 pounds with rings and dovetail, the AT106EDQ rides comfortably on a ZWO AM5, an iOptron GEM28, or an HEQ5-class equatorial mount — the mounts most amateur imagers actually own. It doesn't demand a pier-mounted EQ6 or a permanent setup. At 23.6 inches retracted, it's manageable to carry out to the backyard in one trip. And 106mm of aperture gathers 52% more light than the 86mm version — enough to make a visible difference in exposure times and the faintness of structure you can reach.\u003c\/p\u003e\n\u003cp\u003eIf you're looking for a refractor that images flat out of the box, works on a mid-weight mount, and gives you enough aperture to do serious work without the weight and cost of the 126mm, this is the one that threads that needle.\u003c\/p\u003e\n\u003ch3\u003eThe Focuser\u003c\/h3\u003e\n\u003cp\u003eThe AT106EDQ's 3.2\" rack-and-pinion focuser is built for imaging loads. The right focus knob has a concentric 10:1 fine-focus knob for precise control during critical focusing. The focuser drawtube terminates in a built-in camera angle adjuster that rotates a full 360° and locks at any position — standard equipment, not an extra-cost accessory.\u003c\/p\u003e\n\u003cp\u003eThread options include M63, M54, and M48 — connecting reducers, filter wheels, and cameras without stacking adapters. The 2\" accessory holder uses non-marring brass compression rings, and a 1.25\" adapter is included for smaller eyepieces.\u003c\/p\u003e\n\u003cp\u003eThe drawtube has a millimeter scale for recording focus positions. A lock knob under the focuser secures focus during imaging. The focuser is compatible with electronic focusers like the ZWO EAF for motorized, software-controlled focusing.\u003c\/p\u003e\n\u003ch3\u003eBuild and Mechanical\u003c\/h3\u003e\n\u003cp\u003eThe AT106EDQ is finished in matte black anodize with black-anodized focuser and red accent appointments. The retractable dew shield slides forward from 23.6\" retracted to 29.3\" extended — functional for dew prevention and stray light control, and self-storing so there's nothing extra to track.\u003c\/p\u003e\n\u003cp\u003eThe scope ships with felt-lined hinged split mounting rings with M6×1 thread mounting holes in the top and bottom of each ring. A Vixen-style dovetail and a handle with a mini Vixen saddle plate are included. For heavier equatorial mounts, the rings accept a Losmandy-style D-plate dovetail (sold separately). A dovetail shoe on the upper focuser accepts optional finders or guide scopes.\u003c\/p\u003e\n\u003cp\u003eAt 14.33 pounds with rings, dovetail, and handle (heaviest single component 12.6 pounds), the AT106EDQ is manageable for one-person setup on mid-weight mounts.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAT106EDQ optical tube assembly\u003c\/li\u003e\n\u003cli\u003eFelt-lined hinged split mounting rings (pair) with M6×1 mounting holes\u003c\/li\u003e\n\u003cli\u003eCarrying handle with mini Vixen saddle plate\u003c\/li\u003e\n\u003cli\u003eVixen-style dovetail plate\u003c\/li\u003e\n\u003cli\u003e2\" accessory holder with brass compression ring\u003c\/li\u003e\n\u003cli\u003e1.25\" accessory adapter with brass compression ring\u003c\/li\u003e\n\u003cli\u003eRetractable dew shield\u003c\/li\u003e\n\u003cli\u003eFinderscope mounting shoe\u003c\/li\u003e\n\u003cli\u003eSlip-on metal dust cap\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuadruplet optical system with two ED elements.\u003c\/strong\u003e Four-lens, two-group design: an apochromatic ED triplet objective plus a separate internal ED field-flattening group. Color correction and flat field are built into the optical system — not bolted on as an afterthought.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in flat field to full frame — no external flattener required.\u003c\/strong\u003e The internal ED field-flattening group delivers a 44mm corrected image circle. Stars are round from center to corners across full-frame (36×24mm) sensors. No separate flattener to buy, no spacing to calculate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e106mm aperture at 742mm f\/7.\u003c\/strong\u003e The mid-size EDQ — enough aperture for serious deep-sky imaging and visual observing, at a weight and size that works on mid-range equatorial mounts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully multicoated optics.\u003c\/strong\u003e All air-to-glass surfaces carry antireflection multicoatings matched to their glass types. High light transmission, excellent contrast, and clean images free of color fringing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible with the ATEDQR 0.8× reducer.\u003c\/strong\u003e Add the dedicated reducer (sold separately) to drop from 742mm f\/7 to ~594mm f\/5.6 — 56% more light per pixel, shorter exposures, wider field — while preserving the flat field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.2\" dual-speed rack-and-pinion focuser with 10:1 fine focus.\u003c\/strong\u003e Precise, imaging-capable, with ribbed knobs operable in gloves. Focus lock, mm-scale drawtube markings, and EAF compatibility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in camera angle adjuster.\u003c\/strong\u003e 360° rotation standard — not an extra-cost accessory. Frame targets in any orientation without disassembling the imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM63, M54, and M48 focuser threads.\u003c\/strong\u003e Multiple thread options for connecting reducers, filter wheels, and cameras without adapter stacks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-marring brass compression rings.\u003c\/strong\u003e Both 2\" and 1.25\" accessory holders grip without scratching your eyepiece or accessory barrels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable dew shield.\u003c\/strong\u003e Self-storing — slides forward for use, retracts for transport. Controls dew and stray light.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eObserving Tip\u003c\/h3\u003e\n\u003cp\u003eThe AT106EDQ's flat field makes it a natural for visual sweeping of star-rich Milky Way fields and open clusters. Drop in a wide-field 2\" eyepiece — a 30mm or 35mm — and sweep through Cygnus, Sagittarius, or the Perseus arm. Stars are sharp to the edge of the field, not just in the center. That's the visual payoff of the built-in flattener: you see stars as points everywhere in the field of view, which makes rich star fields and open clusters noticeably more satisfying than through a conventional refractor where the edge stars stretch.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need a separate field flattener with this scope?\u003c\/strong\u003e\u003cbr\u003eNo. The AT106EDQ has a built-in ED field-flattening group that delivers a flat, corrected field across full-frame sensors. No external flattener needed. The only optional optic is the ATEDQR 0.8× reducer if you want a faster focal ratio and wider field.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does this compare to the AT86EDQ and AT126EDQ?\u003c\/strong\u003e\u003cbr\u003eSame optical design in three apertures. The AT86EDQ (86mm, 602mm f\/7, ~11 lbs) is the grab-and-go — lightest, shortest, airline-capable. The AT126EDQ (126mm, 882mm f\/7, ~17.7 lbs) has the most aperture and resolution but needs a heavier mount. The AT106EDQ (106mm, 742mm f\/7, ~14.3 lbs) is the middle ground — 52% more light than the 86, manageable on mounts like the AM5 or HEQ5, and $700 less than the 126. If you want one EDQ that balances aperture, portability, and mount compatibility, this is it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat mount do I need?\u003c\/strong\u003e\u003cbr\u003eAt 14.33 lbs with rings and dovetail, the AT106EDQ works well on a ZWO AM5, iOptron GEM28, or HEQ5-class equatorial for imaging. For visual use, a solid alt-az mount or lighter equatorial will handle it. This is manageable for backyard one-person setup — no permanent pier required.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this visually, or is it imaging-only?\u003c\/strong\u003e\u003cbr\u003eThe AT106EDQ works beautifully for visual observing. 106mm of well-corrected aperture delivers excellent planetary, double star, and deep-sky views. The flat field is a visual advantage too — stars are sharp to the edge of wide-field eyepieces, which makes open clusters and Milky Way sweeping particularly rewarding.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this come with a finder?\u003c\/strong\u003e\u003cbr\u003eA finderscope mounting shoe is included on the focuser housing, but you'll need to add your own finder or guide scope. This lets you choose the setup that matches your use — a red-dot finder for visual, or a guide scope for autoguided imaging.\u003c\/p\u003e\n\u003ch3\u003eAccessories\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eATEDQR 0.8× Reducer:\u003c\/strong\u003e Drops the AT106EDQ from 742mm f\/7 to ~594mm f\/5.6. Faster exposures, wider field, full-frame coverage. Designed specifically for the EDQ series.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eT-ring for your camera mount:\u003c\/strong\u003e Required for connecting DSLR and mirrorless cameras. Dedicated CMOS\/CCD astronomy cameras typically have 48mm T-threads built in and connect directly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinder or guide scope:\u003c\/strong\u003e The AT106EDQ ships with a finderscope shoe but no finder. Add a red-dot finder for visual use or a guide scope for autoguided imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZWO EAF electronic focuser:\u003c\/strong\u003e Compatible with the AT106EDQ's focuser for motorized, software-controlled focusing during remote imaging sessions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eATDUP13 Losmandy D-Plate ($79.95):\u003c\/strong\u003e Upgrade from the included Vixen dovetail for heavier equatorial mounts with Losmandy saddles.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFinal Thoughts\u003c\/h3\u003e\n\u003cp\u003eThe AT106EDQ is the mid-size quad in the Astro-Tech EDQ line — 106mm of aperture at 742mm f\/7 with a built-in ED field flattener that delivers round stars across full-frame sensors without an external corrector. For imagers, it means a shorter, simpler optical train and one less thing to get wrong on setup night. For visual observers, it means 106mm of clean refractor aperture with a flat field that makes wide-field sweeping and open clusters look the way they should. At 14.33 pounds, it rides comfortably on the mounts most amateur imagers already own. Add the 0.8× reducer and you have two focal lengths in one scope — f\/7 for image scale, f\/5.6 for speed. If you want a refractor that images flat out of the box, doesn't demand a heavy mount, and sits at a price point between the compact AT86EDQ and the full-aperture AT126EDQ, the AT106EDQ is the one that balances all three.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eAstro-Tech AT106EDQ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eOptical Design\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eQuadruplet (4 lens \/ 2 group) with built-in ED field flattener\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eAperture\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e106mm (4.17\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eFocal Length\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e742mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eED Elements\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e2 (one in triplet objective, one in field flattener group)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eCorrected Image Circle\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e44mm (full frame and smaller)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eCoatings\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eFully multicoated on all air-to-glass surfaces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eResolution (Dawes Limit)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e1.3 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eVisual Limiting Magnitude\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e12.83\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eHighest Useful Magnification\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e169×\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eFocuser\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e3.2\" dual-speed rack-and-pinion, 10:1 fine focus ratio\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eFocuser Threads\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eM63, M54, M48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eCamera Angle Adjuster\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eBuilt-in, 360° rotation with locking knob\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eAccessory Holders\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e2\" and 1.25\" with non-marring brass compression rings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eDew Shield\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eRetractable (self-storing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eOTA Length (retracted)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e23.6\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eOTA Length (extended)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e29.3\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eWeight (with rings, dovetail, handle)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e14.33 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eHeaviest Single Component\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e12.6 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eTube Finish\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eMatte black anodize with black and red appointments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eMounting Rings\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eFelt-lined hinged split rings with M6×1 mounting holes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eDovetail\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eVixen-style (Losmandy D-plate compatible via mounting holes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eCompatible Reducer\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eATEDQR 0.8× (742mm f\/7 → ~594mm f\/5.6)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eWarranty\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":41598429265993,"sku":"AT106EDQ","price":1999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/106B.png?v=1756397415"},{"product_id":"astro-tech-at126edq-f-7-quad-refractor","title":"Astro-Tech AT126EDQ f\/7 Quad Refractor","description":"\u003cp\u003eMost refractors need a separate field flattener to image properly. You buy the scope, then you buy the flattener, then you figure out the spacing, then you hope the correction matches the optical system well enough to deliver round stars in the corners. It works — we sell a lot of flatteners — but it's an extra piece of glass, an extra connection, and one more thing to get right.\u003c\/p\u003e\n\u003cp\u003eThe AT126EDQ takes a different approach. The field correction is built in. The four-element, two-group optical system uses an ED element in the apochromatic triplet objective and a second ED element in a separate internal field-flattening group. The result is a flat, corrected field straight from the focuser — no external flattener required. Stars are round from center to edge across sensors up to full frame, with a 44mm corrected image circle. You bolt the camera to the focuser and shoot.\u003c\/p\u003e\n\u003cp\u003eAt 126mm of aperture and 882mm f\/7, this is the largest scope in the EDQ line. More aperture means more light, more resolution, and more reach into faint structure. The AT86EDQ and AT106EDQ are excellent instruments for their size, but 126mm puts you into a different class of target — fainter galaxies, tighter nebula detail, smaller planetary nebulae that need the extra resolution to show their structure. And you get all of that with the flat field that defines the EDQ design.\u003c\/p\u003e\n\u003ch3\u003eThe Quad Optical Design\u003c\/h3\u003e\n\u003cp\u003eThe AT126EDQ is a four-lens, two-group system. The front group is an apochromatic triplet with one ED element — this handles the heavy lifting of color correction and primary image formation. Behind it, a separate group containing a second ED element flattens the field. The two groups work together as a system: the triplet delivers a sharp, color-free image, and the flattener ensures that image lands flat across a sensor up to 36×24mm.\u003c\/p\u003e\n\u003cp\u003eAll lens surfaces are fully multicoated with antireflection coatings matched to their specific glass types. The result is high light transmission, excellent contrast, and clean images free of the faint color halos that plague lesser optical designs. At f\/7, the AT126EDQ controls chromatic aberration exceptionally well — bright stars show no color fringing, and high-contrast targets like the lunar limb and planetary discs are clean.\u003c\/p\u003e\n\u003ch3\u003eBuilt-In Flat Field — No Flattener Required\u003c\/h3\u003e\n\u003cp\u003eThis is the defining advantage of the EDQ design. With a conventional triplet or doublet refractor, the focal plane curves. Stars in the center are sharp, but stars at the edges elongate as the curved focal surface diverges from the flat sensor. An external field flattener corrects this — but you have to buy it separately, get the back focus spacing right, and hope the correction is well-matched to the scope.\u003c\/p\u003e\n\u003cp\u003eThe AT126EDQ eliminates all of that. The internal ED field-flattening group is optically matched to the objective lens because it was designed as part of the same system. The 44mm corrected image circle covers full-frame sensors with flat, round stars from center to corners. No external flattener to buy, no spacing to calculate, no wondering whether a generic flattener will work with your specific scope. It's done.\u003c\/p\u003e\n\u003cp\u003eIf you want to go faster, we sell a dedicated 0.8× reducer that drops the AT126EDQ from 882mm f\/7 to 706mm f\/5.6 — a 56% increase in light per pixel, shorter exposures, and a wider field. Because the field is already flat, the reducer's only job is focal reduction. It preserves the flat field the scope was designed to deliver.\u003c\/p\u003e\n\u003ch3\u003eUnder the Night Sky\u003c\/h3\u003e\n\u003cp\u003e126mm of aperture in a refractor is serious glass. The resolution limit is 1.1 arc seconds — enough to split tight doubles and resolve fine planetary detail that smaller scopes can't touch.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMoon:\u003c\/strong\u003e At 126mm, the Moon is deeply detailed. The Alpine Valley rille is visible under good seeing. Craterlets on the floor of Plato resolve as individual pits rather than a general roughness. The terraced walls of Copernicus show their full complexity, and the Straight Wall casts a razor-sharp shadow at the right phase. At 200× to 248×, you're seeing structure that disappears in an 80mm or 90mm scope.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlanets:\u003c\/strong\u003e Jupiter shows the major equatorial belts with internal festoon structure, the Great Red Spot with visible texture, and shadow transits as sharp black dots. Saturn's Cassini Division is a clean, dark line at moderate power, and the crepe ring is visible against the planet's disc with careful observation. Mars at opposition shows dark surface markings — Syrtis Major, the polar cap, and limb clouds — with the color fidelity that only a well-corrected refractor delivers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDouble stars:\u003c\/strong\u003e With a 1.1 arc second Dawes limit, the AT126EDQ splits doubles that challenge smaller scopes. Epsilon Lyrae (the Double Double) is cleanly resolved at 150×. Zeta Herculis at 1.4\" splits with dark space between the components. Porrima (Gamma Virginis) and Castor are textbook pairs. The clean, high-contrast Airy discs that a good refractor produces make doubles one of its strongest visual subjects.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDeep sky:\u003c\/strong\u003e 126mm gathers enough light to show real structure in the brighter Messier objects. M13 begins to resolve individual stars across its face at 150×. M42 shows the Trapezium as four clean stars with nebulosity streaming away from them. M57 (the Ring Nebula) shows its annular shape clearly with a hint of the central star under excellent conditions. The Veil Nebula complex responds well to an O-III filter. Galaxy hunters will see the dust lane in M82, the spiral hints in M51 with averted vision, and the bright cores of dozens of galaxies in Virgo and Coma — and the flat field means stars at the edge of your eyepiece field are as sharp as those in the center.\u003c\/p\u003e\n\u003ch3\u003eFor the Imager\u003c\/h3\u003e\n\u003cp\u003eThe AT126EDQ was designed with imaging in mind. At 882mm f\/7 with a flat field to full frame, it frames mid-size deep-sky targets with excellent image scale and sharp stars from center to corners without any additional corrective optics. The Rosette Nebula, the Crab Nebula, galaxy groups like the Leo Triplet, the Veil complex — these targets fill an APS-C frame beautifully at 882mm, and full-frame shooters get even more field to work with.\u003c\/p\u003e\n\u003cp\u003eAdd the optional ATEDQR 0.8× reducer and the system drops to 706mm f\/5.6. The wider field opens up larger targets — the North America Nebula, M31 with companions, the Heart and Soul pair — and the faster focal ratio cuts exposure times. The 56% increase in light per pixel means you can either shoot shorter subs or reach fainter structure in the same integration time.\u003c\/p\u003e\n\u003cp\u003eThe camera angle adjuster is standard equipment — rotate the camera to frame your target in landscape, portrait, or any angle in between without disassembling the imaging train. The focuser drawtube has a millimeter scale for noting focus positions, and the focus lock prevents shift during long exposures. The focuser is also compatible with electronic focusers like the ZWO EAF for remote focusing during imaging sessions.\u003c\/p\u003e\n\u003ch3\u003eThe Focuser\u003c\/h3\u003e\n\u003cp\u003eThe AT126EDQ's 3.2\" rack-and-pinion focuser is built for imaging loads. The right focus knob has a concentric 10:1 fine-focus knob for precise control — critical when you're dialing in focus on a camera sensor. The focuser drawtube terminates in a built-in camera angle adjuster that rotates a full 360° and locks at any position. This is standard equipment, not an extra-cost accessory.\u003c\/p\u003e\n\u003cp\u003eThe focuser provides multiple thread options: M63, M54, and M48. This gives you flexibility to connect reducers, filter wheels, and cameras without stacking adapters. The 2\" accessory holder uses non-marring brass compression rings — no thumbscrew gouges on your eyepiece barrels. A 1.25\" adapter is included for smaller eyepieces and accessories.\u003c\/p\u003e\n\u003cp\u003eThe drawtube has a scale marked in 1mm increments so you can record focus positions for different accessories. A lock knob under the focuser secures focus during imaging runs. The combination of smooth coarse motion, precise fine focusing, and a solid lock makes this focuser practical for both visual and photographic use without compromise.\u003c\/p\u003e\n\u003ch3\u003eBuild and Mechanical\u003c\/h3\u003e\n\u003cp\u003eThe AT126EDQ is finished in matte black anodize with black-anodized focuser and red accent appointments. The retractable dew shield slides forward from 28.6\" retracted to 34.7\" extended — functional for dew prevention and stray light control, and self-storing so there's nothing to lose or leave at home.\u003c\/p\u003e\n\u003cp\u003eThe scope ships with felt-lined hinged split mounting rings with M6×1 thread mounting holes in the top and bottom of each ring. A Vixen-style dovetail and a handle with a mini Vixen saddle plate are included. For heavier equatorial mounts, the rings accept a Losmandy-style D-plate dovetail (sold separately). A dovetail shoe on the upper focuser accepts optional finders or guide scopes.\u003c\/p\u003e\n\u003cp\u003eAt 17.67 pounds with rings, dovetail, and handle, the AT126EDQ needs a solid mount — an HEQ5-class equatorial or a ZWO AM5 will handle it for imaging. The heaviest single component is 15.6 pounds. The scope ships in a cordura nylon carry case with cutouts for accessories.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAT126EDQ optical tube assembly\u003c\/li\u003e\n\u003cli\u003eFelt-lined hinged split mounting rings (pair) with M6×1 mounting holes\u003c\/li\u003e\n\u003cli\u003eCarrying handle with mini Vixen saddle plate\u003c\/li\u003e\n\u003cli\u003eVixen-style dovetail plate\u003c\/li\u003e\n\u003cli\u003e2\" accessory holder with brass compression ring\u003c\/li\u003e\n\u003cli\u003e1.25\" accessory adapter with brass compression ring\u003c\/li\u003e\n\u003cli\u003eRetractable dew shield\u003c\/li\u003e\n\u003cli\u003eFinderscope mounting shoe\u003c\/li\u003e\n\u003cli\u003eSlip-on metal dust cap\u003c\/li\u003e\n\u003cli\u003eCordura nylon carry case\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuadruplet optical system with two ED elements.\u003c\/strong\u003e Four-lens, two-group design: an apochromatic ED triplet objective plus a separate internal ED field-flattening group. Clean color correction and a flat field are built into the optical system — not added as an afterthought.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in flat field to full frame — no external flattener required.\u003c\/strong\u003e The internal ED field-flattening group delivers a 44mm corrected image circle. Stars are round from center to edge across full-frame (36×24mm) sensors. Skip the separate flattener and the spacing guesswork.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e126mm aperture at 882mm f\/7.\u003c\/strong\u003e The largest scope in the EDQ line. Enough aperture and focal length for detailed imaging of mid-size deep-sky targets and serious visual observing — planetary detail, double stars, and deep-sky structure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully multicoated optics.\u003c\/strong\u003e All air-to-glass surfaces carry antireflection multicoatings matched to their glass types. High light transmission, excellent contrast, and clean images free of color fringing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible with the ATEDQR 0.8× reducer.\u003c\/strong\u003e Add the dedicated reducer (sold separately) to drop from 882mm f\/7 to 706mm f\/5.6 — 56% more light per pixel, shorter exposures, and a wider field — while preserving the flat field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.2\" dual-speed rack-and-pinion focuser with 10:1 fine focus.\u003c\/strong\u003e Beefy, precise, and imaging-capable. Coarse and fine focusing with ribbed knobs operable in gloves. Focus lock and mm-scale drawtube markings. EAF compatible.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in camera angle adjuster.\u003c\/strong\u003e 360° rotation standard — not an extra-cost accessory. Frame targets in any orientation without disassembling the imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM63, M54, and M48 focuser threads.\u003c\/strong\u003e Multiple thread options for connecting reducers, filter wheels, and cameras without stacking adapters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-marring brass compression rings.\u003c\/strong\u003e Both 2\" and 1.25\" accessory holders use soft brass compression rings that grip without scratching your eyepiece or accessory barrels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable dew shield.\u003c\/strong\u003e Self-storing — slides forward for use, retracts for transport. Controls dew and stray light without a separate accessory to track.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eObserving Tip\u003c\/h3\u003e\n\u003cp\u003eIf you're imaging with the AT126EDQ at its native f\/7 and you find yourself wanting a wider field or shorter exposures for larger targets, the ATEDQR 0.8× reducer drops you to 706mm f\/5.6. But don't overlook what f\/7 gives you visually while your camera is cooling down or while you're waiting for your target to clear the trees. At 882mm, a 10mm eyepiece delivers 88× in a wide field — plug in an O-III or UHC filter and sweep through Cygnus. The flat field means the stars at the edge of your eyepiece are as sharp as those in the center, which makes visual sweeping noticeably more pleasant than with a conventional refractor.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need a separate field flattener with this scope?\u003c\/strong\u003e\u003cbr\u003eNo. The AT126EDQ has a built-in ED field-flattening group that delivers a flat, corrected field across full-frame sensors. You don't need an external flattener — it's one of the primary advantages of the quad design. The only accessory optic you might add is the optional 0.8× reducer if you want a faster focal ratio and wider field.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat mount do I need?\u003c\/strong\u003e\u003cbr\u003eAt 17.67 lbs with rings and dovetail, the AT126EDQ needs a mount rated for at least 30 lbs for imaging — an HEQ5 or EQ6-class equatorial, or a ZWO AM5. For visual use, the mount requirements are less demanding. A solid alt-az mount or a lighter equatorial will work, but this is not a grab-and-go scope.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between the AT86EDQ, AT106EDQ, and AT126EDQ?\u003c\/strong\u003e\u003cbr\u003eSame optical design philosophy in three aperture sizes. The AT86EDQ (86mm, 602mm f\/7) is the grab-and-go option — light, compact, airline-friendly. The AT106EDQ (106mm, 742mm f\/7) is the mid-size sweet spot. The AT126EDQ (126mm, 882mm f\/7) is the largest — most aperture, most focal length, most resolving power, but also the heaviest and most demanding on a mount. All three share the quad design with built-in flat field and are compatible with the same ATEDQR 0.8× reducer.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this visually, or is it imaging-only?\u003c\/strong\u003e\u003cbr\u003eThe AT126EDQ works beautifully for visual observing. The quad design was built around imaging, but 126mm of clean, well-corrected aperture delivers excellent planetary, double star, and deep-sky views. The flat field is an advantage visually too — stars are sharp to the edge of the eyepiece field, which makes sweeping star fields and open clusters particularly satisfying.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this come with a finder?\u003c\/strong\u003e\u003cbr\u003eNo — a finderscope mounting shoe is included on the focuser housing, but you'll need to add your own finder or guide scope. This lets you choose the finder that matches your setup — a red-dot finder for visual, or a guide scope for imaging.\u003c\/p\u003e\n\u003ch3\u003eAccessories\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eATEDQR 0.8× Reducer:\u003c\/strong\u003e Drops the AT126EDQ from 882mm f\/7 to 706mm f\/5.6. Faster exposures, wider field, full-frame coverage. Designed specifically for the EDQ series.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eT-ring for your camera mount:\u003c\/strong\u003e Required for connecting DSLR and mirrorless cameras to the focuser's 48mm T-threads. Dedicated CMOS\/CCD astronomy cameras typically have 48mm T-threads built in and connect directly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinder or guide scope:\u003c\/strong\u003e The AT126EDQ ships with a finderscope shoe but no finder. Add a red-dot finder for visual use or a guide scope for autoguided imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZWO EAF electronic focuser:\u003c\/strong\u003e Compatible with the AT126EDQ's focuser. Provides motorized, software-controlled focusing for remote imaging sessions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFinal Thoughts\u003c\/h3\u003e\n\u003cp\u003eThe AT126EDQ is the largest flat-field quad refractor in the Astro-Tech line — 126mm of aperture at 882mm f\/7 with a built-in ED field flattener that delivers round stars across full-frame sensors without an external corrector. For imagers, that means one less piece of glass in the train, one less spacing calculation, and one less thing to go wrong. For visual observers, it means 126mm of clean, well-corrected aperture with pinpoint stars to the edge of the field. Add the 0.8× reducer and you have two imaging systems in one scope — f\/7 for image scale on smaller targets, f\/5.6 for speed and field on larger ones. If you want a refractor that images flat out of the box and gives up nothing visually, and you have the mount to carry it, the AT126EDQ is the scope that does both without compromise.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eAstro-Tech AT126EDQ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eOptical Design\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eQuadruplet (4 lens \/ 2 group) with built-in ED field flattener\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eAperture\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e126mm (4.96\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eFocal Length\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e882mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eED Elements\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e2 (one in triplet objective, one in field flattener group)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eCorrected Image Circle\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e44mm (full frame and smaller)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eCoatings\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eFully multicoated on all air-to-glass surfaces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eResolution (Dawes Limit)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e1.1 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eVisual Limiting Magnitude\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e13.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eHighest Useful Magnification\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e248×\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eFocuser\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e3.2\" dual-speed rack-and-pinion, 10:1 fine focus ratio\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eFocuser Threads\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eM63, M54, M48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eCamera Angle Adjuster\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eBuilt-in, 360° rotation with locking knob\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eAccessory Holders\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e2\" and 1.25\" with non-marring brass compression rings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eDew Shield\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eRetractable (self-storing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eOTA Length (retracted)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e28.6\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eOTA Length (extended)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e34.7\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eWeight (with rings, dovetail, handle)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e17.67 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eHeaviest Single Component\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e15.6 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eTube Finish\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eMatte black anodize with black and red appointments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eMounting Rings\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eFelt-lined hinged split rings with M6×1 mounting holes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eDovetail\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eVixen-style (Losmandy D-plate compatible via mounting holes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eCompatible Reducer\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eATEDQR 0.8× (882mm f\/7 → 706mm f\/5.6)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eCarry Case\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eCordura nylon with accessory cutouts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eWarranty\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":41598481399881,"sku":"AT126EDQ","price":2699.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/126A.png?v=1756397309"},{"product_id":"ioptron-photron™-6-inch-ritchey-chretien-telescope-rc6-ieaf-compatible","title":"iOptron Photron™ 6-inch Ritchey-Chretien Telescope (RC6) - iEAF compatible","description":"\u003cp data-start=\"431\" data-end=\"833\" class=\"\"\u003eThe iOptron Photron™ RC6 offers a compact and affordable entry into true Ritchey-Chrétien optics, making it an excellent choice for astrophotographers and visual observers seeking high-contrast, coma-free performance. With a \u003cstrong data-start=\"656\" data-end=\"679\"\u003e6\" (150mm) aperture\u003c\/strong\u003e, low-expansion quartz mirrors, and a solid steel tube featuring knife-edge baffles, the RC6 delivers sharp, aberration-free images in a portable package.\u003c\/p\u003e\n\u003chr data-start=\"835\" data-end=\"838\" class=\"\"\u003e\n\u003ch3 data-start=\"840\" data-end=\"885\" class=\"\"\u003ePrecision Optics for High-Quality Imaging\u003c\/h3\u003e\n\u003cp data-start=\"887\" data-end=\"1310\" class=\"\"\u003eAt the heart of the RC6 is a true Ritchey-Chrétien optical system utilizing \u003cstrong data-start=\"963\" data-end=\"1007\"\u003ehyperbolic primary and secondary mirrors\u003c\/strong\u003e made from low thermal expansion quartz. These mirrors are coated with high-reflectivity dielectric coatings, ensuring excellent contrast and brightness. The \u003cstrong data-start=\"1165\" data-end=\"1198\"\u003efixed-position primary mirror\u003c\/strong\u003e eliminates image shift during focusing, providing consistent performance for both imaging and visual observing.\u003c\/p\u003e\n\u003cp data-start=\"1312\" data-end=\"1490\" class=\"\"\u003eWith a focal length of \u003cstrong data-start=\"1335\" data-end=\"1352\"\u003e1370mm at f\/9\u003c\/strong\u003e, the RC6 offers a versatile balance between magnification and field of view, making it suitable for a wide range of astronomical targets.\u003c\/p\u003e\n\u003chr data-start=\"1492\" data-end=\"1495\" class=\"\"\u003e\n\u003ch3 data-start=\"1497\" data-end=\"1541\" class=\"\"\u003eSolid Steel Tube with Knife-Edge Baffles\u003c\/h3\u003e\n\u003cp data-start=\"1543\" data-end=\"1929\" class=\"\"\u003eThe RC6's \u003cstrong data-start=\"1553\" data-end=\"1584\"\u003esteel optical tube assembly\u003c\/strong\u003e is designed for rigidity and durability. Internally, the tube features \u003cstrong data-start=\"1656\" data-end=\"1687\"\u003emultiple knife-edge baffles\u003c\/strong\u003e that effectively suppress stray light, enhancing contrast and improving image quality. This design ensures that the telescope performs optimally in various observing conditions, whether in a backyard observatory or at a remote dark-sky site.\u003c\/p\u003e\n\u003chr data-start=\"1931\" data-end=\"1934\" class=\"\"\u003e\n\u003ch3 data-start=\"1936\" data-end=\"1990\" class=\"\"\u003eDual-Speed Crayford Focuser and iEAF Compatibility\u003c\/h3\u003e\n\u003cp data-start=\"1992\" data-end=\"2347\" class=\"\"\u003eEquipped with a \u003cstrong data-start=\"2008\" data-end=\"2042\"\u003e2\" dual-speed Crayford focuser\u003c\/strong\u003e, the RC6 allows for smooth and precise focusing, essential for high-resolution imaging. The focuser supports \u003cstrong data-start=\"2152\" data-end=\"2208\"\u003eiOptron's optional iEAF electronic automatic focuser\u003c\/strong\u003e (sold separately), enabling automated focusing through ASCOM-compatible software—a valuable feature for remote or automated observatories.\u003c\/p\u003e\n\u003cp data-start=\"2349\" data-end=\"2551\" class=\"\"\u003eTo accommodate different imaging setups, the telescope includes \u003cstrong data-start=\"2413\" data-end=\"2447\"\u003ethree threaded extension rings\u003c\/strong\u003e (two 1\" and one 2\"), allowing users to achieve the necessary back focus without compromising stability.\u003c\/p\u003e\n\u003chr data-start=\"2553\" data-end=\"2556\" class=\"\"\u003e\n\u003ch3 data-start=\"2558\" data-end=\"2576\" class=\"\"\u003eSpecifications\u003c\/h3\u003e\n\u003cul data-start=\"2578\" data-end=\"3196\"\u003e\n\u003cli data-start=\"2578\" data-end=\"2604\" class=\"\"\u003e\n\u003cp data-start=\"2580\" data-end=\"2604\" class=\"\"\u003e\u003cstrong data-start=\"2580\" data-end=\"2593\"\u003eAperture:\u003c\/strong\u003e 6\" (150mm)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2605\" data-end=\"2631\" class=\"\"\u003e\n\u003cp data-start=\"2607\" data-end=\"2631\" class=\"\"\u003e\u003cstrong data-start=\"2607\" data-end=\"2624\"\u003eFocal Length:\u003c\/strong\u003e 1370mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2632\" data-end=\"2654\" class=\"\"\u003e\n\u003cp data-start=\"2634\" data-end=\"2654\" class=\"\"\u003e\u003cstrong data-start=\"2634\" data-end=\"2650\"\u003eFocal Ratio:\u003c\/strong\u003e f\/9\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2655\" data-end=\"2703\" class=\"\"\u003e\n\u003cp data-start=\"2657\" data-end=\"2703\" class=\"\"\u003e\u003cstrong data-start=\"2657\" data-end=\"2676\"\u003eOptical Design:\u003c\/strong\u003e Ritchey-Chrétien (true RC)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2704\" data-end=\"2772\" class=\"\"\u003e\n\u003cp data-start=\"2706\" data-end=\"2772\" class=\"\"\u003e\u003cstrong data-start=\"2706\" data-end=\"2726\"\u003eMirror Material:\u003c\/strong\u003e Low-expansion quartz with dielectric coatings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2773\" data-end=\"2832\" class=\"\"\u003e\n\u003cp data-start=\"2775\" data-end=\"2832\" class=\"\"\u003e\u003cstrong data-start=\"2775\" data-end=\"2793\"\u003eTube Material:\u003c\/strong\u003e Steel with multiple knife-edge baffles\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2833\" data-end=\"2870\" class=\"\"\u003e\n\u003cp data-start=\"2835\" data-end=\"2870\" class=\"\"\u003e\u003cstrong data-start=\"2835\" data-end=\"2847\"\u003eFocuser:\u003c\/strong\u003e 2\" dual-speed Crayford\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2871\" data-end=\"2941\" class=\"\"\u003e\n\u003cp data-start=\"2873\" data-end=\"2941\" class=\"\"\u003e\u003cstrong data-start=\"2873\" data-end=\"2899\"\u003eFocuser Compatibility:\u003c\/strong\u003e iEAF electronic focuser (sold separately)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2942\" data-end=\"3000\" class=\"\"\u003e\n\u003cp data-start=\"2944\" data-end=\"3000\" class=\"\"\u003e\u003cstrong data-start=\"2944\" data-end=\"2973\"\u003eExtension Rings Included:\u003c\/strong\u003e 2x 1\" (25mm), 1x 2\" (50mm)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3001\" data-end=\"3032\" class=\"\"\u003e\n\u003cp data-start=\"3003\" data-end=\"3032\" class=\"\"\u003e\u003cstrong data-start=\"3003\" data-end=\"3020\"\u003eDovetail Bar:\u003c\/strong\u003e Vixen-style\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3033\" data-end=\"3060\" class=\"\"\u003e\n\u003cp data-start=\"3035\" data-end=\"3060\" class=\"\"\u003e\u003cstrong data-start=\"3035\" data-end=\"3056\"\u003eFinderscope Base:\u003c\/strong\u003e Yes\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3061\" data-end=\"3093\" class=\"\"\u003e\n\u003cp data-start=\"3063\" data-end=\"3093\" class=\"\"\u003e\u003cstrong data-start=\"3063\" data-end=\"3079\"\u003eTube Length:\u003c\/strong\u003e 19.1\" (485mm)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3094\" data-end=\"3127\" class=\"\"\u003e\n\u003cp data-start=\"3096\" data-end=\"3127\" class=\"\"\u003e\u003cstrong data-start=\"3096\" data-end=\"3111\"\u003eOTA Weight:\u003c\/strong\u003e 12 lbs (5.4 kg)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3128\" data-end=\"3163\" class=\"\"\u003e\n\u003cp data-start=\"3130\" data-end=\"3163\" class=\"\"\u003e\u003cstrong data-start=\"3130\" data-end=\"3147\"\u003eGross Weight:\u003c\/strong\u003e 18 lbs (8.2 kg)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3164\" data-end=\"3196\" class=\"\"\u003e\n\u003cp data-start=\"3166\" data-end=\"3196\" class=\"\"\u003e\u003cstrong data-start=\"3166\" data-end=\"3179\"\u003eWarranty:\u003c\/strong\u003e One-year limited\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3198\" data-end=\"3201\" class=\"\"\u003e\n\u003ch3 data-start=\"3203\" data-end=\"3227\" class=\"\"\u003eIncluded Accessories\u003c\/h3\u003e\n\u003cul data-start=\"3229\" data-end=\"3402\"\u003e\n\u003cli data-start=\"3229\" data-end=\"3274\" class=\"\"\u003e\n\u003cp data-start=\"3231\" data-end=\"3274\" class=\"\"\u003eRC6 OTA with 2\" dual-speed Crayford focuser\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3275\" data-end=\"3317\" class=\"\"\u003e\n\u003cp data-start=\"3277\" data-end=\"3317\" class=\"\"\u003e2x 1\" and 1x 2\" threaded extension rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3318\" data-end=\"3356\" class=\"\"\u003e\n\u003cp data-start=\"3320\" data-end=\"3356\" class=\"\"\u003e2\" to 1.25\" compression ring adapter\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3357\" data-end=\"3383\" class=\"\"\u003e\n\u003cp data-start=\"3359\" data-end=\"3383\" class=\"\"\u003eVixen-style dovetail bar\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3384\" data-end=\"3402\" class=\"\"\u003e\n\u003cp data-start=\"3386\" data-end=\"3402\" class=\"\"\u003eFinderscope base\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3404\" data-end=\"3407\" class=\"\"\u003e\n\u003ch3 data-start=\"3409\" data-end=\"3426\" class=\"\"\u003eObserving Tip\u003c\/h3\u003e\n\u003cp data-start=\"3428\" data-end=\"3747\" class=\"\"\u003eThe RC6's compact size and lightweight design make it an excellent match for mid-class mounts like the iOptron CEM26 or GEM28. Its high-quality optics and solid construction provide a reliable platform for both visual observing and astrophotography, especially when paired with the optional iEAF for automated focusing.\u003c\/p\u003e\n\u003chr data-start=\"3749\" data-end=\"3752\" class=\"\"\u003e\n\u003ch3 data-start=\"3754\" data-end=\"3775\" class=\"\"\u003eSolar Use Warning\u003c\/h3\u003e\n\u003cp data-start=\"3777\" data-end=\"4003\" class=\"\"\u003e\u003cstrong data-start=\"3777\" data-end=\"4003\"\u003eNever look at the Sun through this telescope—or any telescope—without the proper solar filter installed. Permanent eye damage or blindness will result. Always use approved filters designed specifically for solar observing.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e(The finder, diagonal, and eyepiece in the photo are not included with the scope.)\u003cbr\u003e\u003cbr\u003e\u003cb\u003e\u003c\/b\u003e\u003cb\u003ePackage includes\u003cbr\u003e#6111\u003cspan\u003e 6\" RC OTA only\u003c\/span\u003e\u003cbr\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOTA w\/2\" dual speed Crayford focuser\u003c\/li\u003e\n\u003cli\u003e2X25mm, 1X 50mm focus extension\u003c\/li\u003e\n\u003cli\u003e1.25\" accessory adapter\u003c\/li\u003e\n\u003cli\u003eVixen dovetail bar\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable class=\"colors_descriptionbox\" cellpadding=\"0\" cellspacing=\"0\" border=\"0\" width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\" width=\"100%\"\u003e\n\u003ctable border=\"0\" cellspacing=\"0\" cellpadding=\"0\" width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv id=\"ProductDetail_TechSpecs_div\"\u003e\n\u003ctable cellpadding=\"0\" cellspacing=\"0\" border=\"1\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\" width=\"206\"\u003eOptical Design\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"396\"\u003eRitchey-Chretien\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eClear Aperture\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e150mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eFocal Length\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e1370mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd align=\"center\"\u003ef\/9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eResolving Power\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e0.76 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eLimiting Magnitude\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e13.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eHighest Useful Magnification\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e180X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eSecondary Mirror Size\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e67mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eFocuser\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e10:1 Crayford dual-speed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eFocuser size\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e2”\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eDovetail Bar\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eVixen-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eFinderscope Base\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eFinder scope\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eOptional\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eTube material\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eSteel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eTube Length\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e19.1”\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eTube Weight\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e12 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eOther Accessories\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e2” to 1.25” compression ring adapter;\u003cbr\u003e1\" long extension tube X2\u003cbr\u003e2\" long extension tube X1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eGross Weight\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e18 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eWarranty\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eOne year limited\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"iOptron","offers":[{"title":"Default Title","offer_id":41698323759177,"sku":"6111","price":558.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/6111-2T.jpg?v=1724966633"},{"product_id":"ioptron-photron™-8-inch-ritchey-chretien-telescope-rc8-ieaf-compatible","title":"iOptron Photron™ 8-inch Ritchey-Chrétien Telescope (RC8) - iEAF compatible","description":"\u003cp data-start=\"388\" data-end=\"845\" class=\"\"\u003eThe iOptron Photron™ RC8 is the perfect entry point into true Ritchey-Chrétien imaging. Compact, lightweight, and optically refined, this \u003cstrong data-start=\"526\" data-end=\"564\"\u003e8\" (203mm) solid-tube RC telescope\u003c\/strong\u003e offers coma-free, wide-field performance that’s well-suited for everything from galaxies and globulars to lunar and planetary detail. With \u003cstrong data-start=\"704\" data-end=\"721\"\u003equartz optics\u003c\/strong\u003e, internal light baffles, and a rock-solid steel OTA, the RC8 punches well above its weight for visual and photographic use.\u003c\/p\u003e\n\u003cp data-start=\"847\" data-end=\"1055\" class=\"\"\u003eWhether you're upgrading from a beginner scope or looking for a high-resolution astrograph that doesn’t dominate your mount’s payload capacity, the RC8 delivers sharp performance in a travel-friendly package.\u003c\/p\u003e\n\u003chr data-start=\"1057\" data-end=\"1060\" class=\"\"\u003e\n\u003ch3 data-start=\"1062\" data-end=\"1098\" class=\"\"\u003eQuartz Optics and True RC Design\u003c\/h3\u003e\n\u003cp data-start=\"1100\" data-end=\"1470\" class=\"\"\u003eThe RC8 uses a \u003cstrong data-start=\"1115\" data-end=\"1155\"\u003etrue Ritchey-Chrétien optical system\u003c\/strong\u003e, with \u003cstrong data-start=\"1162\" data-end=\"1206\"\u003ehyperbolic primary and secondary mirrors\u003c\/strong\u003e crafted from low-expansion quartz. These mirrors are finished with high-reflectivity dielectric coatings for maximum contrast and light throughput. The result is a flat, coma-free field across full-frame sensors—without needing any correctors or field flatteners.\u003c\/p\u003e\n\u003cp data-start=\"1472\" data-end=\"1625\" class=\"\"\u003eBecause the \u003cstrong data-start=\"1484\" data-end=\"1511\"\u003eprimary mirror is fixed\u003c\/strong\u003e, there’s no image shift when focusing—so your target stays centered and sharp, even with long exposure sequences.\u003c\/p\u003e\n\u003cp data-start=\"1627\" data-end=\"1766\" class=\"\"\u003eWith a \u003cstrong data-start=\"1634\" data-end=\"1667\"\u003efocal length of 1624mm at f\/8\u003c\/strong\u003e, the RC8 is fast enough for deep-sky imaging but still provides tight resolution on small targets.\u003c\/p\u003e\n\u003chr data-start=\"1768\" data-end=\"1771\" class=\"\"\u003e\n\u003ch3 data-start=\"1773\" data-end=\"1809\" class=\"\"\u003eSteel Tube with Internal Baffles\u003c\/h3\u003e\n\u003cp data-start=\"1811\" data-end=\"2091\" class=\"\"\u003eThe \u003cstrong data-start=\"1815\" data-end=\"1828\"\u003esteel OTA\u003c\/strong\u003e is built for durability and thermal consistency. Inside, \u003cstrong data-start=\"1886\" data-end=\"1914\"\u003eeight knife-edge baffles\u003c\/strong\u003e are spaced along the optical path to absorb stray light and suppress internal reflections. This improves contrast and makes the RC8 a great performer even under suburban skies.\u003c\/p\u003e\n\u003cp data-start=\"2093\" data-end=\"2266\" class=\"\"\u003eThe solid-tube construction offers a more closed system than a truss tube, making it better suited to environments where dew, dust, or wind might interfere with performance.\u003c\/p\u003e\n\u003chr data-start=\"2268\" data-end=\"2271\" class=\"\"\u003e\n\u003ch3 data-start=\"2273\" data-end=\"2310\" class=\"\"\u003eCrayford Focuser with iEAF Option\u003c\/h3\u003e\n\u003cp data-start=\"2312\" data-end=\"2668\" class=\"\"\u003eThe RC8 includes a \u003cstrong data-start=\"2331\" data-end=\"2365\"\u003e2\" dual-speed Crayford focuser\u003c\/strong\u003e, offering fine control for both visual use and astrophotography. For those looking to automate focus routines, the focuser is \u003cstrong data-start=\"2492\" data-end=\"2555\"\u003ecompatible with iOptron’s iEAF electronic automatic focuser\u003c\/strong\u003e (sold separately), which integrates easily with ASCOM-compliant software for remote and robotic imaging control.\u003c\/p\u003e\n\u003cp data-start=\"2670\" data-end=\"2813\" class=\"\"\u003eThree threaded extension rings (2x 1\", 1x 2\") are included to help you achieve the correct back focus spacing for your camera or imaging train.\u003c\/p\u003e\n\u003chr data-start=\"2815\" data-end=\"2818\" class=\"\"\u003e\n\u003ch3 data-start=\"2820\" data-end=\"2843\" class=\"\"\u003eActive Cooling Fans\u003c\/h3\u003e\n\u003cp data-start=\"2845\" data-end=\"3110\" class=\"\"\u003eThree \u003cstrong data-start=\"2851\" data-end=\"2880\"\u003erear-mounted cooling fans\u003c\/strong\u003e are built into the back of the primary mirror cell to speed thermal equalization. A \u003cstrong data-start=\"2965\" data-end=\"2981\"\u003ebattery pack\u003c\/strong\u003e is included to power the fans in the field, helping you get imaging or observing faster on nights with large temperature swings.\u003c\/p\u003e\n\u003chr data-start=\"3112\" data-end=\"3115\" class=\"\"\u003e\n\u003ch3 data-start=\"3117\" data-end=\"3135\" class=\"\"\u003eSpecifications\u003c\/h3\u003e\n\u003cul data-start=\"3137\" data-end=\"3765\"\u003e\n\u003cli data-start=\"3137\" data-end=\"3165\" class=\"\"\u003e\n\u003cp data-start=\"3139\" data-end=\"3165\" class=\"\"\u003e\u003cstrong data-start=\"3139\" data-end=\"3152\"\u003eAperture:\u003c\/strong\u003e 8\" (203mm)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3166\" data-end=\"3194\" class=\"\"\u003e\n\u003cp data-start=\"3168\" data-end=\"3194\" class=\"\"\u003e\u003cstrong data-start=\"3168\" data-end=\"3185\"\u003eFocal Length:\u003c\/strong\u003e 1624mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3195\" data-end=\"3219\" class=\"\"\u003e\n\u003cp data-start=\"3197\" data-end=\"3219\" class=\"\"\u003e\u003cstrong data-start=\"3197\" data-end=\"3213\"\u003eFocal Ratio:\u003c\/strong\u003e f\/8\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3220\" data-end=\"3265\" class=\"\"\u003e\n\u003cp data-start=\"3222\" data-end=\"3265\" class=\"\"\u003e\u003cstrong data-start=\"3222\" data-end=\"3241\"\u003eOptical Design:\u003c\/strong\u003e True Ritchey-Chrétien\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3266\" data-end=\"3322\" class=\"\"\u003e\n\u003cp data-start=\"3268\" data-end=\"3322\" class=\"\"\u003e\u003cstrong data-start=\"3268\" data-end=\"3288\"\u003eMirror Material:\u003c\/strong\u003e Quartz with dielectric coatings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3323\" data-end=\"3395\" class=\"\"\u003e\n\u003cp data-start=\"3325\" data-end=\"3395\" class=\"\"\u003e\u003cstrong data-start=\"3325\" data-end=\"3347\"\u003eTube Construction:\u003c\/strong\u003e Steel tube with 8 internal knife-edge baffles\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3396\" data-end=\"3435\" class=\"\"\u003e\n\u003cp data-start=\"3398\" data-end=\"3435\" class=\"\"\u003e\u003cstrong data-start=\"3398\" data-end=\"3410\"\u003eFocuser:\u003c\/strong\u003e 2\" dual-speed Crayford\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3436\" data-end=\"3489\" class=\"\"\u003e\n\u003cp data-start=\"3438\" data-end=\"3489\" class=\"\"\u003e\u003cstrong data-start=\"3438\" data-end=\"3464\"\u003eFocuser Compatibility:\u003c\/strong\u003e iEAF (sold separately)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3490\" data-end=\"3550\" class=\"\"\u003e\n\u003cp data-start=\"3492\" data-end=\"3550\" class=\"\"\u003e\u003cstrong data-start=\"3492\" data-end=\"3512\"\u003eExtension Rings:\u003c\/strong\u003e 2x 1\" (25mm), 1x 2\" (50mm) threaded\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3551\" data-end=\"3623\" class=\"\"\u003e\n\u003cp data-start=\"3553\" data-end=\"3623\" class=\"\"\u003e\u003cstrong data-start=\"3553\" data-end=\"3570\"\u003eCooling Fans:\u003c\/strong\u003e 3 rear-mounted, powered by included battery holder\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3624\" data-end=\"3658\" class=\"\"\u003e\n\u003cp data-start=\"3626\" data-end=\"3658\" class=\"\"\u003e\u003cstrong data-start=\"3626\" data-end=\"3642\"\u003eTube Length:\u003c\/strong\u003e 22.5\" (570mm)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3659\" data-end=\"3696\" class=\"\"\u003e\n\u003cp data-start=\"3661\" data-end=\"3696\" class=\"\"\u003e\u003cstrong data-start=\"3661\" data-end=\"3676\"\u003eOTA Weight:\u003c\/strong\u003e 18.7 lbs (8.5 kg)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3697\" data-end=\"3765\" class=\"\"\u003e\n\u003cp data-start=\"3699\" data-end=\"3765\" class=\"\"\u003e\u003cstrong data-start=\"3699\" data-end=\"3712\"\u003eMounting:\u003c\/strong\u003e Dual Losmandy-style dovetail plates (top and bottom)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3767\" data-end=\"3770\" class=\"\"\u003e\n\u003ch3 data-start=\"3772\" data-end=\"3796\" class=\"\"\u003eIncluded Accessories\u003c\/h3\u003e\n\u003cul data-start=\"3798\" data-end=\"4014\"\u003e\n\u003cli data-start=\"3798\" data-end=\"3834\" class=\"\"\u003e\n\u003cp data-start=\"3800\" data-end=\"3834\" class=\"\"\u003eRC8 OTA with 2\" Crayford focuser\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3835\" data-end=\"3879\" class=\"\"\u003e\n\u003cp data-start=\"3837\" data-end=\"3879\" class=\"\"\u003e2x 1\" and 1x 2\" threaded extension rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3880\" data-end=\"3903\" class=\"\"\u003e\n\u003cp data-start=\"3882\" data-end=\"3903\" class=\"\"\u003e2\" to 1.25\" adapter\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3904\" data-end=\"3932\" class=\"\"\u003e\n\u003cp data-start=\"3906\" data-end=\"3932\" class=\"\"\u003eCooling fan battery pack\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3933\" data-end=\"3972\" class=\"\"\u003e\n\u003cp data-start=\"3935\" data-end=\"3972\" class=\"\"\u003ePrimary and secondary mirror covers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3973\" data-end=\"4014\" class=\"\"\u003e\n\u003cp data-start=\"3975\" data-end=\"4014\" class=\"\"\u003eTop and bottom Losmandy dovetail plates\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4016\" data-end=\"4019\" class=\"\"\u003e\n\u003ch3 data-start=\"4021\" data-end=\"4038\" class=\"\"\u003eObserving Tip\u003c\/h3\u003e\n\u003cp data-start=\"4040\" data-end=\"4327\" class=\"\"\u003eThe RC8 is an excellent match for mid-class mounts like the GEM45 or CEM40, offering excellent imaging capability without overtaxing your gear. Its low weight, fast cooldown, and sharp optics make it a portable powerhouse—especially when paired with the iEAF for fully automated imaging.\u003c\/p\u003e\n\u003chr data-start=\"4329\" data-end=\"4332\" class=\"\"\u003e\n\u003ch3 data-start=\"4334\" data-end=\"4355\" class=\"\"\u003eSolar Use Warning\u003c\/h3\u003e\n\u003cp data-start=\"4357\" data-end=\"4583\" class=\"\"\u003e\u003cstrong data-start=\"4357\" data-end=\"4583\"\u003eNever look at the Sun through this telescope—or any telescope—without the proper solar filter installed. Permanent eye damage or blindness will result. Always use approved filters designed specifically for solar observing.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003ePictured finderscope, diagonal and eyepiece not included\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e\u003c\/b\u003e\u003cb\u003ePackage includes\u003cbr\u003e#6112\u003cspan\u003e 8\" RC OTA only\u003c\/span\u003e\u003cbr\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOTA w\/2\" dual-speed Crayford focuser\u003c\/li\u003e\n\u003cli\u003e2X25mm, 1X 50mm focus extension\u003c\/li\u003e\n\u003cli\u003e1.25\" accessory adapter\u003c\/li\u003e\n\u003cli\u003eTop Vixen-style mounting bar and bottom Losmandy-style dovetail bar\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable class=\"colors_descriptionbox\" cellpadding=\"0\" cellspacing=\"0\" border=\"0\" width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\" width=\"100%\"\u003e\n\u003ctable border=\"0\" cellspacing=\"0\" cellpadding=\"0\" width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv id=\"ProductDetail_TechSpecs_div\"\u003e\n\u003ctable cellpadding=\"0\" cellspacing=\"0\" border=\"1\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\" width=\"206\"\u003eOptical Design\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"396\"\u003eRitchey-Chretien\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eClear Aperture\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e200mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eFocal Length\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e1624mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd align=\"center\"\u003ef\/8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eResolving Power\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e0.58 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eLimiting Magnitude\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e14.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eHighest Useful Magnification\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e236X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eSecondary Mirror Size\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e95mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eFocuser\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e10:1 Crayford dual-speed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eFocuser size\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e2”\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eDovetail Bar\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eLosmandy-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eMounting Bar (Top)\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eVixen-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eFinderscope Base\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eFinder scope\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eOptional\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eTube material\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eSteel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eTube Length\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e22.0”\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eTube Weight\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e18 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eOther Accessories\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e2” to 1.25” compression ring adapter;\u003cbr\u003e1\" long extension tube X2\u003cbr\u003e2\" long extension tube X1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eGross Weight\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e25 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eWarranty\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eOne year limited\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"iOptron","offers":[{"title":"Default Title","offer_id":41698327920713,"sku":"6112","price":1178.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/6112-2T.jpg?v=1724967007"},{"product_id":"ioptron-photron™-10-inch-ritchey-chretien-telescope-rc10-w-optional-ieaf-compatibility","title":"iOptron Photron™ 10-inch Ritchey-Chrétien Telescope (RC10) w\/ optional iEAF compatibility","description":"\u003cp data-start=\"457\" data-end=\"882\" class=\"\"\u003eThe iOptron Photron™ RC10 is a precision-engineered astrograph designed for serious astrophotographers and advanced visual observers. Featuring a \u003cstrong data-start=\"603\" data-end=\"627\"\u003e10\" (250mm) aperture\u003c\/strong\u003e, low-expansion quartz optics, and a robust steel tube with knife-edge baffles, this solid-tube Ritchey-Chrétien telescope delivers sharp, coma-free images across the entire field—ideal for capturing detailed views of galaxies, nebulae, and star clusters.\u003c\/p\u003e\n\u003chr data-start=\"884\" data-end=\"887\" class=\"\"\u003e\n\u003ch3 data-start=\"889\" data-end=\"916\" class=\"\"\u003eHigh-Performance Optics\u003c\/h3\u003e\n\u003cp data-start=\"918\" data-end=\"1350\" class=\"\"\u003eAt the heart of the RC10 is a true Ritchey-Chrétien optical system with \u003cstrong data-start=\"990\" data-end=\"1034\"\u003ehyperbolic primary and secondary mirrors\u003c\/strong\u003e, both constructed from low thermal expansion quartz. These mirrors are coated with high-reflectivity dielectric coatings, ensuring excellent contrast and brightness. The \u003cstrong data-start=\"1205\" data-end=\"1238\"\u003efixed-position primary mirror\u003c\/strong\u003e eliminates image shift during focusing, providing consistent performance for both imaging and visual observing.\u003c\/p\u003e\n\u003cp data-start=\"1352\" data-end=\"1531\" class=\"\"\u003eWith a focal length of \u003cstrong data-start=\"1375\" data-end=\"1392\"\u003e2000mm at f\/8\u003c\/strong\u003e, the RC10 offers a versatile balance between magnification and field of view, making it suitable for a wide range of astronomical targets.\u003c\/p\u003e\n\u003chr data-start=\"1533\" data-end=\"1536\" class=\"\"\u003e\n\u003ch3 data-start=\"1538\" data-end=\"1582\" class=\"\"\u003eSolid Steel Tube with Knife-Edge Baffles\u003c\/h3\u003e\n\u003cp data-start=\"1584\" data-end=\"1965\" class=\"\"\u003eThe RC10's \u003cstrong data-start=\"1595\" data-end=\"1626\"\u003esteel optical tube assembly\u003c\/strong\u003e is designed for rigidity and durability. Internally, the tube features \u003cstrong data-start=\"1698\" data-end=\"1723\"\u003e10 knife-edge baffles\u003c\/strong\u003e that effectively suppress stray light, enhancing contrast and improving image quality. This design ensures that the telescope performs optimally in various observing conditions, whether in a backyard observatory or at a remote dark-sky site.\u003c\/p\u003e\n\u003chr data-start=\"1967\" data-end=\"1970\" class=\"\"\u003e\n\u003ch3 data-start=\"1972\" data-end=\"2016\" class=\"\"\u003ePrecision Focuser and iEAF Compatibility\u003c\/h3\u003e\n\u003cp data-start=\"2018\" data-end=\"2376\" class=\"\"\u003eEquipped with a \u003cstrong data-start=\"2034\" data-end=\"2070\"\u003e3.3\" dual-speed Crayford focuser\u003c\/strong\u003e, the RC10 allows for smooth and precise focusing, essential for high-resolution imaging. The focuser supports \u003cstrong data-start=\"2181\" data-end=\"2237\"\u003eiOptron's optional iEAF electronic automatic focuser\u003c\/strong\u003e (sold separately), enabling automated focusing through ASCOM-compatible software—a valuable feature for remote or automated observatories.\u003c\/p\u003e\n\u003cp data-start=\"2378\" data-end=\"2580\" class=\"\"\u003eTo accommodate different imaging setups, the telescope includes \u003cstrong data-start=\"2442\" data-end=\"2476\"\u003ethree threaded extension rings\u003c\/strong\u003e (two 1\" and one 2\"), allowing users to achieve the necessary back focus without compromising stability.\u003c\/p\u003e\n\u003chr data-start=\"2582\" data-end=\"2585\" class=\"\"\u003e\n\u003ch3 data-start=\"2587\" data-end=\"2616\" class=\"\"\u003eIntegrated Cooling System\u003c\/h3\u003e\n\u003cp data-start=\"2618\" data-end=\"2947\" class=\"\"\u003eTo facilitate rapid thermal equilibrium, the RC10 is equipped with \u003cstrong data-start=\"2685\" data-end=\"2720\"\u003ethree rear-mounted cooling fans\u003c\/strong\u003e that circulate air across the primary mirror. This system reduces cooldown time, ensuring that the telescope is ready for imaging or observing sessions more quickly. A battery holder is included to power the fans in the field.\u003c\/p\u003e\n\u003chr data-start=\"2949\" data-end=\"2952\" class=\"\"\u003e\n\u003ch3 data-start=\"2954\" data-end=\"2972\" class=\"\"\u003eSpecifications\u003c\/h3\u003e\n\u003cul data-start=\"2974\" data-end=\"3589\"\u003e\n\u003cli data-start=\"2974\" data-end=\"3001\" class=\"\"\u003e\n\u003cp data-start=\"2976\" data-end=\"3001\" class=\"\"\u003e\u003cstrong data-start=\"2976\" data-end=\"2989\"\u003eAperture:\u003c\/strong\u003e 10\" (250mm)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3002\" data-end=\"3028\" class=\"\"\u003e\n\u003cp data-start=\"3004\" data-end=\"3028\" class=\"\"\u003e\u003cstrong data-start=\"3004\" data-end=\"3021\"\u003eFocal Length:\u003c\/strong\u003e 2000mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3029\" data-end=\"3051\" class=\"\"\u003e\n\u003cp data-start=\"3031\" data-end=\"3051\" class=\"\"\u003e\u003cstrong data-start=\"3031\" data-end=\"3047\"\u003eFocal Ratio:\u003c\/strong\u003e f\/8\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3052\" data-end=\"3100\" class=\"\"\u003e\n\u003cp data-start=\"3054\" data-end=\"3100\" class=\"\"\u003e\u003cstrong data-start=\"3054\" data-end=\"3073\"\u003eOptical Design:\u003c\/strong\u003e Ritchey-Chrétien (true RC)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3101\" data-end=\"3169\" class=\"\"\u003e\n\u003cp data-start=\"3103\" data-end=\"3169\" class=\"\"\u003e\u003cstrong data-start=\"3103\" data-end=\"3123\"\u003eMirror Material:\u003c\/strong\u003e Low-expansion quartz with dielectric coatings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3170\" data-end=\"3232\" class=\"\"\u003e\n\u003cp data-start=\"3172\" data-end=\"3232\" class=\"\"\u003e\u003cstrong data-start=\"3172\" data-end=\"3190\"\u003eTube Material:\u003c\/strong\u003e Steel with 10 internal knife-edge baffles\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3233\" data-end=\"3272\" class=\"\"\u003e\n\u003cp data-start=\"3235\" data-end=\"3272\" class=\"\"\u003e\u003cstrong data-start=\"3235\" data-end=\"3247\"\u003eFocuser:\u003c\/strong\u003e 3.3\" dual-speed Crayford\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3273\" data-end=\"3343\" class=\"\"\u003e\n\u003cp data-start=\"3275\" data-end=\"3343\" class=\"\"\u003e\u003cstrong data-start=\"3275\" data-end=\"3301\"\u003eFocuser Compatibility:\u003c\/strong\u003e iEAF electronic focuser (sold separately)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3344\" data-end=\"3402\" class=\"\"\u003e\n\u003cp data-start=\"3346\" data-end=\"3402\" class=\"\"\u003e\u003cstrong data-start=\"3346\" data-end=\"3375\"\u003eExtension Rings Included:\u003c\/strong\u003e 2x 1\" (25mm), 1x 2\" (50mm)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3403\" data-end=\"3454\" class=\"\"\u003e\n\u003cp data-start=\"3405\" data-end=\"3454\" class=\"\"\u003e\u003cstrong data-start=\"3405\" data-end=\"3422\"\u003eCooling Fans:\u003c\/strong\u003e 3 rear-mounted, battery-powered\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3455\" data-end=\"3487\" class=\"\"\u003e\n\u003cp data-start=\"3457\" data-end=\"3487\" class=\"\"\u003e\u003cstrong data-start=\"3457\" data-end=\"3473\"\u003eTube Length:\u003c\/strong\u003e 28.4\" (721mm)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3488\" data-end=\"3522\" class=\"\"\u003e\n\u003cp data-start=\"3490\" data-end=\"3522\" class=\"\"\u003e\u003cstrong data-start=\"3490\" data-end=\"3505\"\u003eOTA Weight:\u003c\/strong\u003e 35 lbs (15.9 kg)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3523\" data-end=\"3589\" class=\"\"\u003e\n\u003cp data-start=\"3525\" data-end=\"3589\" class=\"\"\u003e\u003cstrong data-start=\"3525\" data-end=\"3538\"\u003eMounting:\u003c\/strong\u003e Dual Losmandy-style dovetail bars (top and bottom)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3591\" data-end=\"3594\" class=\"\"\u003e\n\u003ch3 data-start=\"3596\" data-end=\"3620\" class=\"\"\u003eIncluded Accessories\u003c\/h3\u003e\n\u003cul data-start=\"3622\" data-end=\"3865\"\u003e\n\u003cli data-start=\"3622\" data-end=\"3670\" class=\"\"\u003e\n\u003cp data-start=\"3624\" data-end=\"3670\" class=\"\"\u003eRC10 OTA with 3.3\" dual-speed Crayford focuser\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3671\" data-end=\"3713\" class=\"\"\u003e\n\u003cp data-start=\"3673\" data-end=\"3713\" class=\"\"\u003e2x 1\" and 1x 2\" threaded extension rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3714\" data-end=\"3752\" class=\"\"\u003e\n\u003cp data-start=\"3716\" data-end=\"3752\" class=\"\"\u003e2\" to 1.25\" compression ring adapter\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3753\" data-end=\"3781\" class=\"\"\u003e\n\u003cp data-start=\"3755\" data-end=\"3781\" class=\"\"\u003eCooling fan battery holder\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3782\" data-end=\"3819\" class=\"\"\u003e\n\u003cp data-start=\"3784\" data-end=\"3819\" class=\"\"\u003ePrimary and secondary mirror covers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3820\" data-end=\"3865\" class=\"\"\u003e\n\u003cp data-start=\"3822\" data-end=\"3865\" class=\"\"\u003eTop and bottom Losmandy-style dovetail bars\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3867\" data-end=\"3870\" class=\"\"\u003e\n\u003ch3 data-start=\"3872\" data-end=\"3889\" class=\"\"\u003eObserving Tip\u003c\/h3\u003e\n\u003cp data-start=\"3891\" data-end=\"4240\" class=\"\"\u003eThe RC10's solid-tube design offers excellent thermal stability and stray light suppression, making it a reliable choice for astrophotographers seeking consistent performance. Pairing this telescope with a robust equatorial mount, such as the iOptron CEM70, will provide the stability and tracking accuracy needed for long-exposure imaging sessions.\u003c\/p\u003e\n\u003chr data-start=\"4242\" data-end=\"4245\" class=\"\"\u003e\n\u003ch3 data-start=\"4247\" data-end=\"4268\" class=\"\"\u003eSolar Use Warning\u003c\/h3\u003e\n\u003cp data-start=\"4270\" data-end=\"4496\" class=\"\"\u003e\u003cstrong data-start=\"4270\" data-end=\"4496\"\u003eNever look at the Sun through this telescope—or any telescope—without the proper solar filter installed. Permanent eye damage or blindness will result. Always use approved filters designed specifically for solar observing.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003cb\u003ePackage includes\u003c\/b\u003e\u003cbr\u003e\u003cb\u003e#6113\u003c\/b\u003e 10\" RC OTA only\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOTA w\/3\" dual-speed Crayford focuser\u003c\/li\u003e\n\u003cli\u003e2X25mm, 1X 50mm focus extension\u003c\/li\u003e\n\u003cli\u003e1.25\" accessory adapter\u003c\/li\u003e\n\u003cli\u003eTop and bottom Losmandy dovetail bars\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable border=\"0\" cellspacing=\"0\" cellpadding=\"0\" width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv id=\"ProductDetail_TechSpecs_div\"\u003e\n\u003ctable cellpadding=\"0\" cellspacing=\"0\" border=\"1\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\" width=\"206\"\u003eOptical Design\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"396\"\u003eRitchey-Chretien\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eClear Aperture\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e250mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eFocal Length\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e2000mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd align=\"center\"\u003ef\/8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eResolving Power\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e0.46 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eLimiting Magnitude\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e14.7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eHighest Useful Magnification\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e295X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eSecondary Mirror Size\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e110mm in diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eFocuser\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e10:1 Crayford dual-speed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eFocuser size\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e3.3”\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eDovetail Bar\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eLosmandy-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eMounting Bar (Top)\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eLosmandy-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eFinderscope Base\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eFinder scope\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eOptional\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eTube material\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eSteel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eTube Length\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e28.4”\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eTube Weight\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e35 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eOTA Primary Mirror Cooling Fan\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eYes (three built-in fan, with battery holder)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eOther Accessories\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e2” to 1.25” compression ring adapter;\u003cbr\u003e1\" long extension tube X2\u003cbr\u003e2\" long extension tube X1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eGross Weight\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e48 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"right\"\u003eWarranty\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eOne year limited\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cimg alt=\"\" height=\"1\" width=\"1\" src=\"https:\/\/www.ioptron.com\/v\/vspfiles\/templates\/backup1\/images\/clear1x1.gif\"\u003e\u003cimg alt=\"\" src=\"https:\/\/www.ioptron.com\/v\/vspfiles\/templates\/backup1\/images\/DBox_Border_Left_Bottom.gif\"\u003e\u003cimg alt=\"\" height=\"1\" width=\"1\" src=\"https:\/\/www.ioptron.com\/v\/vspfiles\/templates\/backup1\/images\/clear1x1.gif\"\u003e\u003cimg alt=\"\" src=\"https:\/\/www.ioptron.com\/v\/vspfiles\/templates\/backup1\/images\/DBox_Border_Right_Bottom.gif\"\u003e\u003c\/p\u003e","brand":"iOptron","offers":[{"title":"Default Title","offer_id":41698332704841,"sku":"6113","price":2888.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/6113-2T.jpg?v=1724967321"},{"product_id":"ioptron-6-inch-f-4-imaging-newtonian-ieaf-compatible","title":"iOptron  6-inch F\/4 Imaging Newtonian iEAF compatible","description":"\u003cp data-start=\"392\" data-end=\"798\" class=\"\"\u003eSmall but mighty, the \u003cstrong data-start=\"414\" data-end=\"468\"\u003eiOptron 6\" f\/4 Imaging Newtonian Reflector (#6311)\u003c\/strong\u003e delivers impressive wide-field performance in a compact, lightweight package. With its fast focal ratio, large aperture for its size, and iEAF-compatible dual-speed focuser, this telescope is a smart choice for astrophotographers on the move or beginners looking to dip a toe into deep-sky imaging without overcommitting on gear.\u003c\/p\u003e\n\u003cp data-start=\"800\" data-end=\"1149\" class=\"\"\u003eDon’t let the \"imaging\" label fool you—this scope also makes for a highly capable visual instrument, especially under dark skies. Its bright optics, wide field, and easy collimation make it a terrific all-around performer for those who want both \u003cstrong data-start=\"1046\" data-end=\"1073\"\u003ereal visual versatility\u003c\/strong\u003e and \u003cstrong data-start=\"1078\" data-end=\"1124\"\u003efast, efficient astrophotography potential\u003c\/strong\u003e—without the back strain.\u003c\/p\u003e\n\u003ch4 data-start=\"1151\" data-end=\"1200\" class=\"\"\u003eA Portable Astrograph with a Wide, Fast View\u003c\/h4\u003e\n\u003cp data-start=\"1202\" data-end=\"1692\" class=\"\"\u003eThe 150mm aperture gathers plenty of light to bring out nebulae, galaxies, and clusters in both eyepieces and camera sensors. The \u003cstrong data-start=\"1332\" data-end=\"1351\"\u003ef\/4 focal ratio\u003c\/strong\u003e offers fast exposures, generous true fields, and more forgiving guiding, making this scope a great match for lightweight mounts and portable setups. At \u003cstrong data-start=\"1504\" data-end=\"1526\"\u003e600mm focal length\u003c\/strong\u003e, you can frame extended targets like the Rosette Nebula, North America Nebula, or the Andromeda Galaxy with ease—especially when paired with an APS-C or 4\/3\" sensor.\u003c\/p\u003e\n\u003cp data-start=\"1694\" data-end=\"1870\" class=\"\"\u003eThis is the kind of scope that works well for outreach, imaging under dark skies, or a compact travel rig you can take to star parties or remote dark sites with minimal effort.\u003c\/p\u003e\n\u003ch4 data-start=\"1872\" data-end=\"1917\" class=\"\"\u003eDual-Speed Crayford Focuser – iEAF Ready\u003c\/h4\u003e\n\u003cp data-start=\"1919\" data-end=\"2289\" class=\"\"\u003eDespite its small size, the 6\" Imaging Newtonian features a \u003cstrong data-start=\"1979\" data-end=\"2019\"\u003e2\" dual-speed Crayford-style focuser\u003c\/strong\u003e with a 10:1 fine adjustment knob for critical focusing at fast focal ratios. The focuser is \u003cstrong data-start=\"2112\" data-end=\"2167\"\u003epre-drilled for the iOptron iEAF electronic focuser\u003c\/strong\u003e (sold separately), allowing you to step into hands-free focusing whenever you're ready to automate your imaging workflow.\u003c\/p\u003e\n\u003cp data-start=\"2291\" data-end=\"2433\" class=\"\"\u003eA \u003cstrong data-start=\"2293\" data-end=\"2316\"\u003e2\" to 1.25\" adapter\u003c\/strong\u003e with compression ring is included so you can use a wide variety of eyepieces or attach your preferred imaging train.\u003c\/p\u003e\n\u003ch4 data-start=\"2435\" data-end=\"2471\" class=\"\"\u003eMount-Ready and Built to Travel\u003c\/h4\u003e\n\u003cp data-start=\"2473\" data-end=\"2876\" class=\"\"\u003eThis OTA is supported by a set of \u003cstrong data-start=\"2507\" data-end=\"2543\"\u003eCNC-machined aluminum tube rings\u003c\/strong\u003e and a \u003cstrong data-start=\"2550\" data-end=\"2579\"\u003eVixen-style dovetail rail\u003c\/strong\u003e, making it ready to mount on any lightweight equatorial or hybrid system like the iOptron \u003cstrong data-start=\"2670\" data-end=\"2679\"\u003eCEM26\u003c\/strong\u003e, \u003cstrong data-start=\"2681\" data-end=\"2690\"\u003eHEM27\u003c\/strong\u003e, \u003cstrong data-start=\"2692\" data-end=\"2701\"\u003eGEM28\u003c\/strong\u003e, or even the \u003cstrong data-start=\"2715\" data-end=\"2735\"\u003eSky-Watcher HEQ5\u003c\/strong\u003e. Its compact dimensions and \u003cstrong data-start=\"2764\" data-end=\"2791\"\u003eOTA weight under 14 lbs\u003c\/strong\u003e make it extremely friendly to travel mounts, portable piers, and grab-and-go setups.\u003c\/p\u003e\n\u003cp data-start=\"2878\" data-end=\"3034\" class=\"\"\u003eAn \u003cstrong data-start=\"2881\" data-end=\"2919\"\u003e8x50 straight-through finder scope\u003c\/strong\u003e is included to make initial alignment easy—whether you’re hopping between visual targets or lining up guide stars.\u003c\/p\u003e\n\u003ch4 data-start=\"3036\" data-end=\"3066\" class=\"\"\u003eVisual Use That Surprises\u003c\/h4\u003e\n\u003cp data-start=\"3068\" data-end=\"3506\" class=\"\"\u003eEven though it's branded as an “imaging” telescope, this 6\" Newtonian can pull double duty at the eyepiece. You'll enjoy expansive views of open clusters, star fields, and bright nebulae, especially when paired with a wide-field 2\" eyepiece. With its short focal length, it's particularly enjoyable for casual sweeping of the Milky Way and other large targets. Add a coma corrector and the image sharpness extends to the field edges, too.\u003c\/p\u003e\n\u003chr data-start=\"3508\" data-end=\"3511\" class=\"\"\u003e\n\u003ch3 data-start=\"3513\" data-end=\"3535\" class=\"\"\u003eWhat’s in the Box:\u003c\/h3\u003e\n\u003cul data-start=\"3537\" data-end=\"3797\"\u003e\n\u003cli data-start=\"3537\" data-end=\"3585\" class=\"\"\u003e\n\u003cp data-start=\"3539\" data-end=\"3585\" class=\"\"\u003e6\" f\/4 Newtonian Optical Tube Assembly (OTA)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3586\" data-end=\"3639\" class=\"\"\u003e\n\u003cp data-start=\"3588\" data-end=\"3639\" class=\"\"\u003eDual-speed 2\" Crayford-style focuser (iEAF-ready)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3640\" data-end=\"3691\" class=\"\"\u003e\n\u003cp data-start=\"3642\" data-end=\"3691\" class=\"\"\u003e2\" to 1.25\" adapter with brass compression ring\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3692\" data-end=\"3719\" class=\"\"\u003e\n\u003cp data-start=\"3694\" data-end=\"3719\" class=\"\"\u003eCNC-machined tube rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3720\" data-end=\"3753\" class=\"\"\u003e\n\u003cp data-start=\"3722\" data-end=\"3753\" class=\"\"\u003eVixen-style mounting dovetail\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3754\" data-end=\"3797\" class=\"\"\u003e\n\u003cp data-start=\"3756\" data-end=\"3797\" class=\"\"\u003e8x50 straight-through finder with bracket\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3799\" data-end=\"3802\" class=\"\"\u003e\n\u003ch3 data-start=\"3804\" data-end=\"3833\" class=\"\"\u003eTechnical Specifications:\u003c\/h3\u003e\n\u003cul data-start=\"3835\" data-end=\"4235\"\u003e\n\u003cli data-start=\"3835\" data-end=\"3878\" class=\"\"\u003e\n\u003cp data-start=\"3837\" data-end=\"3878\" class=\"\"\u003e\u003cstrong data-start=\"3837\" data-end=\"3855\"\u003eOptical Design\u003c\/strong\u003e: Newtonian reflector\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3879\" data-end=\"3907\" class=\"\"\u003e\n\u003cp data-start=\"3881\" data-end=\"3907\" class=\"\"\u003e\u003cstrong data-start=\"3881\" data-end=\"3893\"\u003eAperture\u003c\/strong\u003e: 150mm (6\")\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3908\" data-end=\"3935\" class=\"\"\u003e\n\u003cp data-start=\"3910\" data-end=\"3935\" class=\"\"\u003e\u003cstrong data-start=\"3910\" data-end=\"3926\"\u003eFocal Length\u003c\/strong\u003e: 600mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3936\" data-end=\"3960\" class=\"\"\u003e\n\u003cp data-start=\"3938\" data-end=\"3960\" class=\"\"\u003e\u003cstrong data-start=\"3938\" data-end=\"3953\"\u003eFocal Ratio\u003c\/strong\u003e: f\/4\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3961\" data-end=\"4030\" class=\"\"\u003e\n\u003cp data-start=\"3963\" data-end=\"4030\" class=\"\"\u003e\u003cstrong data-start=\"3963\" data-end=\"3974\"\u003eFocuser\u003c\/strong\u003e: 2\" dual-speed Crayford, pre-drilled for iOptron iEAF\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4031\" data-end=\"4075\" class=\"\"\u003e\n\u003cp data-start=\"4033\" data-end=\"4075\" class=\"\"\u003e\u003cstrong data-start=\"4033\" data-end=\"4059\"\u003eEyepiece Compatibility\u003c\/strong\u003e: 2\" and 1.25\"\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4076\" data-end=\"4118\" class=\"\"\u003e\n\u003cp data-start=\"4078\" data-end=\"4118\" class=\"\"\u003e\u003cstrong data-start=\"4078\" data-end=\"4093\"\u003eTube Length\u003c\/strong\u003e: Approx. 22.8\" (580mm)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4119\" data-end=\"4164\" class=\"\"\u003e\n\u003cp data-start=\"4121\" data-end=\"4164\" class=\"\"\u003e\u003cstrong data-start=\"4121\" data-end=\"4135\"\u003eOTA Weight\u003c\/strong\u003e: Approx. 13.6 lbs (6.2 kg)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4165\" data-end=\"4211\" class=\"\"\u003e\n\u003cp data-start=\"4167\" data-end=\"4211\" class=\"\"\u003e\u003cstrong data-start=\"4167\" data-end=\"4186\"\u003eIncluded Finder\u003c\/strong\u003e: 8x50 straight-through\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4212\" data-end=\"4235\" class=\"\"\u003e\n\u003cp data-start=\"4214\" data-end=\"4235\" class=\"\"\u003e\u003cstrong data-start=\"4214\" data-end=\"4229\"\u003ePart Number\u003c\/strong\u003e: 6311\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4237\" data-end=\"4240\" class=\"\"\u003e\n\u003ch3 data-start=\"4242\" data-end=\"4260\" class=\"\"\u003eObserving Tip:\u003c\/h3\u003e\n\u003cp data-start=\"4261\" data-end=\"4577\" class=\"\"\u003eIf you’re using this scope visually, pairing it with a 24mm or 30mm wide-angle eyepiece gives you a big, immersive true field perfect for open clusters like the Pleiades, the Double Cluster, or even the entire Veil Nebula with a narrowband filter. Just add a coma corrector for sharp star points from center to edge.\u003c\/p\u003e\n\u003chr data-start=\"4579\" data-end=\"4582\" class=\"\"\u003e\n\u003ch3 data-start=\"4584\" data-end=\"4600\" class=\"\"\u003eImaging Tip:\u003c\/h3\u003e\n\u003cp data-start=\"4601\" data-end=\"4928\" class=\"\"\u003eThis OTA is tailor-made for fast, efficient astrophotography. Pair it with a \u003cstrong data-start=\"4678\" data-end=\"4696\"\u003ecoma corrector\u003c\/strong\u003e and a lightweight equatorial mount for a travel-friendly imaging rig capable of tackling large targets like IC 1396, M31, or the Heart and Soul Nebulae. Add an iEAF focuser for hands-off focusing and your automation is ready to go.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable cellpadding=\"0\" cellspacing=\"0\" border=\"1\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"210\"\u003eOptical Design\u003c\/td\u003e\n\u003ctd width=\"400\"\u003eNewtonian\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e150mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e600mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003eDual speed Crayford-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Length\u003c\/td\u003e\n\u003ctd\u003e22 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutside diameter\u003c\/td\u003e\n\u003ctd\u003e7 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA weight\u003c\/td\u003e\n\u003ctd\u003e9lb. 10oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExtension tube\u003c\/td\u003e\n\u003ctd\u003e2\" diameter 35mm L\u003cbr\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eOne year limited\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"iOptron","offers":[{"title":"Default Title","offer_id":41733577277513,"sku":"6311","price":458.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/6311-2T.jpg?v=1725992459"},{"product_id":"ioptron-8-inch-f-4-imaging-newtonian-ieaf-compatible","title":"iOptron 8-inch F\/4 Imaging Newtonian iEAF compatible","description":"\u003cp data-start=\"507\" data-end=\"1013\" class=\"\"\u003eIf you're ready to step up your astrophotography game—or simply want a big aperture telescope that won’t weigh down your mount or your budget—the \u003cstrong data-start=\"653\" data-end=\"707\"\u003eiOptron 8\" f\/4 Imaging Newtonian Reflector (#6312)\u003c\/strong\u003e is a smart, capable, and highly versatile OTA. Designed for fast, wide-field imaging, this scope brings a lot to the table: a full 203mm of aperture, an impressively short focal length of 800mm, and a finely-machined Crayford-style focuser that’s \u003cstrong data-start=\"955\" data-end=\"1012\"\u003epre-drilled for iOptron’s iEAF electronic autofocuser\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"1015\" data-end=\"1358\" class=\"\"\u003eWhile it’s marketed as an “imaging” Newtonian, don’t let the label fool you—it performs beautifully at the eyepiece, too. Whether you’re photographing distant galaxies or visually scanning star clusters in real time, this 8\" Newtonian serves up bright, sharp views with the kind of performance that outpaces most refractors in its price range.\u003c\/p\u003e\n\u003ch4 data-start=\"1360\" data-end=\"1397\" class=\"\"\u003eFast Optics for Deep Sky Imaging\u003c\/h4\u003e\n\u003cp data-start=\"1399\" data-end=\"1857\" class=\"\"\u003eWith an \u003cstrong data-start=\"1407\" data-end=\"1426\"\u003ef\/4 focal ratio\u003c\/strong\u003e, this OTA is built to deliver quick exposures and a wide field of view—ideal for framing large nebulae, emission regions, and broad galaxy fields. The relatively short 800mm focal length helps minimize guiding demands while still giving enough reach for smaller targets. For imagers using APS-C or full-frame sensors, it hits a sweet spot between field width and detail—especially when paired with a coma corrector (not included).\u003c\/p\u003e\n\u003cp data-start=\"1859\" data-end=\"2040\" class=\"\"\u003eThanks to its fast light cone and generous 203mm aperture, it also excels under less-than-perfect skies, pulling in faint objects quickly before sky glow or moonlight wash them out.\u003c\/p\u003e\n\u003ch4 data-start=\"2042\" data-end=\"2080\" class=\"\"\u003eVisual Performance That Surprises\u003c\/h4\u003e\n\u003cp data-start=\"2082\" data-end=\"2498\" class=\"\"\u003eWhile the optics and layout clearly favor astrophotography, the scope is also a \u003cstrong data-start=\"2162\" data-end=\"2197\"\u003every competent visual performer\u003c\/strong\u003e. Its low f\/ratio gives wide-field eyepieces room to breathe, delivering immersive views of the Milky Way, open clusters, and large deep-sky objects. A well-collimated f\/4 Newtonian can also handle planetary viewing with excellent contrast when paired with quality eyepieces and a good coma corrector.\u003c\/p\u003e\n\u003cp data-start=\"2500\" data-end=\"2687\" class=\"\"\u003eAt just under 21 lbs, the 8\" OTA is mount-friendly and manageable for most mid-size equatorial systems. It offers big aperture performance without the handling challenges of larger tubes.\u003c\/p\u003e\n\u003ch4 data-start=\"2689\" data-end=\"2729\" class=\"\"\u003eiEAF-Compatible 2\" Crayford Focuser\u003c\/h4\u003e\n\u003cp data-start=\"2731\" data-end=\"3202\" class=\"\"\u003eThe dual-speed \u003cstrong data-start=\"2746\" data-end=\"2775\"\u003e2\" Crayford-style focuser\u003c\/strong\u003e is designed for precision and stability. It includes a 10:1 microfocus knob for critical focusing—especially important at fast focal ratios. The focuser is \u003cstrong data-start=\"2932\" data-end=\"2986\"\u003epre-drilled for the iOptron iEAF motorized focuser\u003c\/strong\u003e, allowing you to easily upgrade to automated, software-controlled focusing when you're ready to automate your imaging workflow. The included \u003cstrong data-start=\"3128\" data-end=\"3151\"\u003e2\" to 1.25\" adapter\u003c\/strong\u003e accepts any standard eyepiece or camera accessory.\u003c\/p\u003e\n\u003ch4 data-start=\"3204\" data-end=\"3236\" class=\"\"\u003eRigid, Mount-Ready Hardware\u003c\/h4\u003e\n\u003cp data-start=\"3238\" data-end=\"3571\" class=\"\"\u003eThe tube is cradled by \u003cstrong data-start=\"3261\" data-end=\"3283\"\u003eCNC-machined rings\u003c\/strong\u003e with tapped holes for accessories and a \u003cstrong data-start=\"3324\" data-end=\"3353\"\u003eVixen-style dovetail rail\u003c\/strong\u003e for compatibility with popular mounts like the iOptron \u003cstrong data-start=\"3409\" data-end=\"3418\"\u003eGEM28\u003c\/strong\u003e, \u003cstrong data-start=\"3420\" data-end=\"3429\"\u003eCEM26\u003c\/strong\u003e, and \u003cstrong data-start=\"3435\" data-end=\"3444\"\u003eHEM27\u003c\/strong\u003e. An \u003cstrong data-start=\"3449\" data-end=\"3489\"\u003e8x50 straight-through optical finder\u003c\/strong\u003e is included, providing a wide field for initial alignment and target acquisition.\u003c\/p\u003e\n\u003ch4 data-start=\"3573\" data-end=\"3611\" class=\"\"\u003eFully Collimatable Optical System\u003c\/h4\u003e\n\u003cp data-start=\"3613\" data-end=\"3876\" class=\"\"\u003eAs with any fast Newtonian, alignment is critical for top-tier performance. Both the \u003cstrong data-start=\"3698\" data-end=\"3746\"\u003eprimary and secondary mirrors are adjustable\u003c\/strong\u003e, and the tube maintains collimation well once dialed in. A laser or Cheshire collimator is recommended for setup and maintenance.\u003c\/p\u003e\n\u003chr data-start=\"3878\" data-end=\"3881\" class=\"\"\u003e\n\u003ch3 data-start=\"3883\" data-end=\"3905\" class=\"\"\u003eWhat's in the Box:\u003c\/h3\u003e\n\u003cul data-start=\"3907\" data-end=\"4161\"\u003e\n\u003cli data-start=\"3907\" data-end=\"3955\" class=\"\"\u003e\n\u003cp data-start=\"3909\" data-end=\"3955\" class=\"\"\u003e8\" f\/4 Newtonian Optical Tube Assembly (OTA)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3956\" data-end=\"4009\" class=\"\"\u003e\n\u003cp data-start=\"3958\" data-end=\"4009\" class=\"\"\u003eDual-speed 2\" Crayford-style focuser (iEAF-ready)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4010\" data-end=\"4055\" class=\"\"\u003e\n\u003cp data-start=\"4012\" data-end=\"4055\" class=\"\"\u003e2\" to 1.25\" adapter with compression ring\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4056\" data-end=\"4083\" class=\"\"\u003e\n\u003cp data-start=\"4058\" data-end=\"4083\" class=\"\"\u003eCNC-machined tube rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4084\" data-end=\"4117\" class=\"\"\u003e\n\u003cp data-start=\"4086\" data-end=\"4117\" class=\"\"\u003eVixen-style mounting dovetail\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4118\" data-end=\"4161\" class=\"\"\u003e\n\u003cp data-start=\"4120\" data-end=\"4161\" class=\"\"\u003e8x50 straight-through finder with bracket\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4163\" data-end=\"4166\" class=\"\"\u003e\n\u003ch3 data-start=\"4168\" data-end=\"4197\" class=\"\"\u003eTechnical Specifications:\u003c\/h3\u003e\n\u003cul data-start=\"4199\" data-end=\"4602\"\u003e\n\u003cli data-start=\"4199\" data-end=\"4242\" class=\"\"\u003e\n\u003cp data-start=\"4201\" data-end=\"4242\" class=\"\"\u003e\u003cstrong data-start=\"4201\" data-end=\"4219\"\u003eOptical Design\u003c\/strong\u003e: Newtonian reflector\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4243\" data-end=\"4271\" class=\"\"\u003e\n\u003cp data-start=\"4245\" data-end=\"4271\" class=\"\"\u003e\u003cstrong data-start=\"4245\" data-end=\"4257\"\u003eAperture\u003c\/strong\u003e: 203mm (8\")\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4272\" data-end=\"4299\" class=\"\"\u003e\n\u003cp data-start=\"4274\" data-end=\"4299\" class=\"\"\u003e\u003cstrong data-start=\"4274\" data-end=\"4290\"\u003eFocal Length\u003c\/strong\u003e: 800mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4300\" data-end=\"4324\" class=\"\"\u003e\n\u003cp data-start=\"4302\" data-end=\"4324\" class=\"\"\u003e\u003cstrong data-start=\"4302\" data-end=\"4317\"\u003eFocal Ratio\u003c\/strong\u003e: f\/4\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4325\" data-end=\"4397\" class=\"\"\u003e\n\u003cp data-start=\"4327\" data-end=\"4397\" class=\"\"\u003e\u003cstrong data-start=\"4327\" data-end=\"4338\"\u003eFocuser\u003c\/strong\u003e: 2\" dual-speed Crayford, iEAF mounting holes pre-drilled\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4398\" data-end=\"4442\" class=\"\"\u003e\n\u003cp data-start=\"4400\" data-end=\"4442\" class=\"\"\u003e\u003cstrong data-start=\"4400\" data-end=\"4426\"\u003eEyepiece Compatibility\u003c\/strong\u003e: 1.25\" and 2\"\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4443\" data-end=\"4485\" class=\"\"\u003e\n\u003cp data-start=\"4445\" data-end=\"4485\" class=\"\"\u003e\u003cstrong data-start=\"4445\" data-end=\"4460\"\u003eTube Length\u003c\/strong\u003e: Approx. 28.3\" (720mm)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4486\" data-end=\"4531\" class=\"\"\u003e\n\u003cp data-start=\"4488\" data-end=\"4531\" class=\"\"\u003e\u003cstrong data-start=\"4488\" data-end=\"4502\"\u003eOTA Weight\u003c\/strong\u003e: Approx. 20.9 lbs (9.5 kg)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4532\" data-end=\"4578\" class=\"\"\u003e\n\u003cp data-start=\"4534\" data-end=\"4578\" class=\"\"\u003e\u003cstrong data-start=\"4534\" data-end=\"4553\"\u003eIncluded Finder\u003c\/strong\u003e: 8x50 straight-through\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4579\" data-end=\"4602\" class=\"\"\u003e\n\u003cp data-start=\"4581\" data-end=\"4602\" class=\"\"\u003e\u003cstrong data-start=\"4581\" data-end=\"4596\"\u003ePart Number\u003c\/strong\u003e: 6312\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4604\" data-end=\"4607\" class=\"\"\u003e\n\u003ch3 data-start=\"4609\" data-end=\"4634\" class=\"\"\u003eVisual Observing Tip:\u003c\/h3\u003e\n\u003cp data-start=\"4635\" data-end=\"4939\" class=\"\"\u003eWith a 24mm–30mm wide-field eyepiece, this scope becomes a fantastic visual instrument. The fast focal ratio yields rich-field views that rival much more expensive setups—particularly in dark skies. Add a coma corrector and you’ll enjoy crisp stars edge-to-edge, even with long focal length 2\" eyepieces.\u003c\/p\u003e\n\u003chr data-start=\"4941\" data-end=\"4944\" class=\"\"\u003e\n\u003ch3 data-start=\"4946\" data-end=\"4962\" class=\"\"\u003eImaging Tip:\u003c\/h3\u003e\n\u003cp data-start=\"4963\" data-end=\"5326\" class=\"\"\u003ePair this OTA with a \u003cstrong data-start=\"4984\" data-end=\"5002\"\u003ecoma corrector\u003c\/strong\u003e for sharp imaging across the full field, especially with APS-C and full-frame sensors. Add the \u003cstrong data-start=\"5098\" data-end=\"5133\"\u003eiOptron iEAF electronic focuser\u003c\/strong\u003e and you’re ready for fully automated focusing sessions in NINA, SGP, or Ekos. With a capable mount and guidescope, this 8\" reflector will easily pull in deep sky targets with beautiful detail.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable width=\"100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\" class=\"colors_descriptionbox\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"100%\" valign=\"top\"\u003e\n\u003ctable width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" border=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv id=\"ProductDetail_TechSpecs_div\"\u003e\n\u003cbr\u003e\n\u003ctable border=\"1\" cellspacing=\"0\" cellpadding=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"210\"\u003eOptical Design\u003c\/td\u003e\n\u003ctd width=\"400\"\u003eNewtonian\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e200mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e800mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003eDual speed Crayford-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Length\u003c\/td\u003e\n\u003ctd\u003e27.75 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutside diameter\u003c\/td\u003e\n\u003ctd\u003e9.5 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA weight\u003c\/td\u003e\n\u003ctd\u003e20lb. 6oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExtension tube\u003c\/td\u003e\n\u003ctd\u003e2\" diameter 35mm\u003cbr\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eOne year limited\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"iOptron","offers":[{"title":"Default Title","offer_id":41733626757193,"sku":"6312","price":628.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/6312-2T.jpg?v=1725994807"},{"product_id":"ioptron-10-inch-f-4-imaging-newtonian-ieaf-compatible","title":"iOptron 10-inch F\/4 Imaging Newtonian iEAF compatible","description":"\u003cp data-start=\"522\" data-end=\"1120\" class=\"\"\u003eIf you're looking for a large-aperture reflector that can handle serious astrophotography while still delivering stunning visual views, the \u003cstrong data-start=\"662\" data-end=\"717\"\u003eiOptron 10\" f\/4 Imaging Newtonian Reflector (#6313)\u003c\/strong\u003e deserves a place on your shortlist. With a generous \u003cstrong data-start=\"770\" data-end=\"794\"\u003e254mm (10\") aperture\u003c\/strong\u003e and a fast \u003cstrong data-start=\"806\" data-end=\"825\"\u003ef\/4 focal ratio\u003c\/strong\u003e, this scope is built to gather light quickly, cover wide swaths of sky, and reveal faint deep-sky targets with sharp contrast and clarity. And thanks to its \u003cstrong data-start=\"983\" data-end=\"1023\"\u003edual-speed 2\" Crayford-style focuser\u003c\/strong\u003e, it's equally capable of high-quality visual observing with your favorite 1.25\" or 2\" eyepieces.\u003c\/p\u003e\n\u003cp data-start=\"1122\" data-end=\"1511\" class=\"\"\u003eDesigned with astrophotographers in mind, this Newtonian comes \u003cstrong data-start=\"1185\" data-end=\"1248\"\u003epre-drilled for iOptron’s iEAF electronic automatic focuser\u003c\/strong\u003e (sold separately), giving you an easy upgrade path to motorized focusing and software-controlled automation. But even without the iEAF, its mechanical construction is solid and thoughtfully executed, with features you'd expect to find in scopes costing far more.\u003c\/p\u003e\n\u003ch4 data-start=\"1513\" data-end=\"1554\" class=\"\"\u003eFast, Bright, and Wide-Field Capable\u003c\/h4\u003e\n\u003cp data-start=\"1556\" data-end=\"1986\" class=\"\"\u003eThe 10\" aperture gathers over \u003cstrong data-start=\"1586\" data-end=\"1632\"\u003e1200 times more light than the unaided eye\u003c\/strong\u003e, making it ideal for pulling in galaxies, emission nebulae, planetary nebulae, globular clusters, and even fainter reflection and dark nebulae under darker skies. The \u003cstrong data-start=\"1800\" data-end=\"1819\"\u003ef\/4 focal ratio\u003c\/strong\u003e makes it an astrograph by design—producing a flat, wide field that’s well-suited for APS-C and full-frame sensors when paired with a coma corrector (sold separately).\u003c\/p\u003e\n\u003cp data-start=\"1988\" data-end=\"2319\" class=\"\"\u003eFor imaging, this means faster exposures, less demand on guiding accuracy, and an ideal balance between resolution and field of view. For visual use, it means bright, bold views—particularly on extended objects like the Veil Nebula, Andromeda Galaxy, or Orion Nebula, where a wide true field and fast optics make a real difference.\u003c\/p\u003e\n\u003ch4 data-start=\"2321\" data-end=\"2356\" class=\"\"\u003ePrecision Focuser – iEAF Ready\u003c\/h4\u003e\n\u003cp data-start=\"2358\" data-end=\"2825\" class=\"\"\u003eThe \u003cstrong data-start=\"2362\" data-end=\"2402\"\u003edual-speed 2\" Crayford-style focuser\u003c\/strong\u003e provides smooth, backlash-free focusing that holds heavy loads with ease. Fine focus control is essential at f\/4, and the 10:1 microfocusing knob lets you make razor-sharp adjustments—whether by hand or with an \u003cstrong data-start=\"2614\" data-end=\"2636\"\u003eiOptron iEAF motor\u003c\/strong\u003e, which can be added using the pre-drilled mounting holes. A \u003cstrong data-start=\"2697\" data-end=\"2720\"\u003e2\" to 1.25\" adapter\u003c\/strong\u003e with brass compression ring is included, allowing you to use any standard eyepiece or imaging accessory.\u003c\/p\u003e\n\u003ch4 data-start=\"2827\" data-end=\"2871\" class=\"\"\u003eSturdy Rings, Finder, and Mounting Rail\u003c\/h4\u003e\n\u003cp data-start=\"2873\" data-end=\"3236\" class=\"\"\u003eThe optical tube is supported by a pair of \u003cstrong data-start=\"2916\" data-end=\"2943\"\u003eCNC-machined tube rings\u003c\/strong\u003e, each with top mounting points for adding guidescopes or accessories. A \u003cstrong data-start=\"3016\" data-end=\"3045\"\u003eVixen-style dovetail rail\u003c\/strong\u003e is attached to the bottom of the rings, making it easy to mount to a wide variety of equatorial systems, including the iOptron GEM45, CEM40, HEM44, and others in the ~30–45 lb payload class.\u003c\/p\u003e\n\u003cp data-start=\"3238\" data-end=\"3414\" class=\"\"\u003eThe included \u003cstrong data-start=\"3251\" data-end=\"3291\"\u003e8x50 straight-through optical finder\u003c\/strong\u003e gives a bright, wide field that makes alignment and object acquisition easy, whether you're imaging or observing visually.\u003c\/p\u003e\n\u003ch4 data-start=\"3416\" data-end=\"3454\" class=\"\"\u003eFully Collimatable, Fully Capable\u003c\/h4\u003e\n\u003cp data-start=\"3456\" data-end=\"3821\" class=\"\"\u003eAs with all fast Newtonians, collimation is key to performance—and this OTA is up to the task. The \u003cstrong data-start=\"3555\" data-end=\"3609\"\u003eprimary and secondary mirrors are fully adjustable\u003c\/strong\u003e, and the structure is stiff enough to hold collimation well across sessions. We do recommend using a laser or Cheshire-style collimator to dial things in, especially if you'll be imaging at full frame or beyond.\u003c\/p\u003e\n\u003chr data-start=\"3823\" data-end=\"3826\" class=\"\"\u003e\n\u003ch3 data-start=\"3828\" data-end=\"3850\" class=\"\"\u003eWhat's in the Box:\u003c\/h3\u003e\n\u003cul data-start=\"3852\" data-end=\"4116\"\u003e\n\u003cli data-start=\"3852\" data-end=\"3901\" class=\"\"\u003e\n\u003cp data-start=\"3854\" data-end=\"3901\" class=\"\"\u003e10\" f\/4 Newtonian Optical Tube Assembly (OTA)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3902\" data-end=\"3960\" class=\"\"\u003e\n\u003cp data-start=\"3904\" data-end=\"3960\" class=\"\"\u003eDual-speed 2\" Crayford-style focuser (iEAF compatible)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3961\" data-end=\"4006\" class=\"\"\u003e\n\u003cp data-start=\"3963\" data-end=\"4006\" class=\"\"\u003e2\" to 1.25\" adapter with compression ring\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4007\" data-end=\"4034\" class=\"\"\u003e\n\u003cp data-start=\"4009\" data-end=\"4034\" class=\"\"\u003eCNC-machined tube rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4035\" data-end=\"4064\" class=\"\"\u003e\n\u003cp data-start=\"4037\" data-end=\"4064\" class=\"\"\u003eVixen-style dovetail rail\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4065\" data-end=\"4116\" class=\"\"\u003e\n\u003cp data-start=\"4067\" data-end=\"4116\" class=\"\"\u003e8x50 straight-through optical finder with bracket\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4118\" data-end=\"4121\" class=\"\"\u003e\n\u003ch3 data-start=\"4123\" data-end=\"4152\" class=\"\"\u003eTechnical Specifications:\u003c\/h3\u003e\n\u003cul data-start=\"4154\" data-end=\"4589\"\u003e\n\u003cli data-start=\"4154\" data-end=\"4197\" class=\"\"\u003e\n\u003cp data-start=\"4156\" data-end=\"4197\" class=\"\"\u003e\u003cstrong data-start=\"4156\" data-end=\"4174\"\u003eOptical Design\u003c\/strong\u003e: Newtonian reflector\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4198\" data-end=\"4227\" class=\"\"\u003e\n\u003cp data-start=\"4200\" data-end=\"4227\" class=\"\"\u003e\u003cstrong data-start=\"4200\" data-end=\"4212\"\u003eAperture\u003c\/strong\u003e: 254mm (10\")\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4228\" data-end=\"4256\" class=\"\"\u003e\n\u003cp data-start=\"4230\" data-end=\"4256\" class=\"\"\u003e\u003cstrong data-start=\"4230\" data-end=\"4246\"\u003eFocal Length\u003c\/strong\u003e: 1000mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4257\" data-end=\"4281\" class=\"\"\u003e\n\u003cp data-start=\"4259\" data-end=\"4281\" class=\"\"\u003e\u003cstrong data-start=\"4259\" data-end=\"4274\"\u003eFocal Ratio\u003c\/strong\u003e: f\/4\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4282\" data-end=\"4354\" class=\"\"\u003e\n\u003cp data-start=\"4284\" data-end=\"4354\" class=\"\"\u003e\u003cstrong data-start=\"4284\" data-end=\"4295\"\u003eFocuser\u003c\/strong\u003e: 2\" dual-speed Crayford, iEAF mounting holes pre-drilled\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4355\" data-end=\"4418\" class=\"\"\u003e\n\u003cp data-start=\"4357\" data-end=\"4418\" class=\"\"\u003e\u003cstrong data-start=\"4357\" data-end=\"4383\"\u003eEyepiece Compatibility\u003c\/strong\u003e: 2\" and 1.25\" (adapter included)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4419\" data-end=\"4463\" class=\"\"\u003e\n\u003cp data-start=\"4421\" data-end=\"4463\" class=\"\"\u003e\u003cstrong data-start=\"4421\" data-end=\"4433\"\u003eMounting\u003c\/strong\u003e: Vixen-style dovetail plate\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4464\" data-end=\"4510\" class=\"\"\u003e\n\u003cp data-start=\"4466\" data-end=\"4510\" class=\"\"\u003e\u003cstrong data-start=\"4466\" data-end=\"4485\"\u003eIncluded Finder\u003c\/strong\u003e: 8x50 straight-through\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4511\" data-end=\"4557\" class=\"\"\u003e\n\u003cp data-start=\"4513\" data-end=\"4557\" class=\"\"\u003e\u003cstrong data-start=\"4513\" data-end=\"4527\"\u003eOTA Weight\u003c\/strong\u003e: Approx. 25.4 lbs (11.5 kg)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4558\" data-end=\"4589\" class=\"\"\u003e\n\u003cp data-start=\"4560\" data-end=\"4589\" class=\"\"\u003e\u003cstrong data-start=\"4560\" data-end=\"4583\"\u003eiOptron Part Number\u003c\/strong\u003e: 6313\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4591\" data-end=\"4594\" class=\"\"\u003e\n\u003ch3 data-start=\"4596\" data-end=\"4621\" class=\"\"\u003eVisual Observing Tip:\u003c\/h3\u003e\n\u003cp data-start=\"4622\" data-end=\"4982\" class=\"\"\u003eWhile this scope shines in the imaging world, it’s also an outstanding visual performer. With a low-power 30–35mm wide-field eyepiece, you’ll enjoy immersive views of star fields, bright nebulae, and larger galaxies. Add a high-quality coma corrector and you’ll be surprised how crisp the views stay from center to edge—especially with 2\" wide-angle eyepieces.\u003c\/p\u003e\n\u003chr data-start=\"4984\" data-end=\"4987\" class=\"\"\u003e\n\u003ch3 data-start=\"4989\" data-end=\"5005\" class=\"\"\u003eImaging Tip:\u003c\/h3\u003e\n\u003cp data-start=\"5006\" data-end=\"5327\" class=\"\"\u003eFast f\/4 reflectors benefit significantly from a \u003cstrong data-start=\"5055\" data-end=\"5073\"\u003ecoma corrector\u003c\/strong\u003e to deliver pinpoint stars across the entire sensor. Add an iOptron iEAF or other motorized focuser for automatic focusing routines in NINA, SGP, or Ekos, and you’ll have a deep-sky workhorse capable of producing sharp, repeatable results all night long.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable class=\"colors_descriptionbox\" cellpadding=\"0\" cellspacing=\"0\" border=\"0\" width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\" width=\"100%\"\u003e\n\u003ctable border=\"0\" cellspacing=\"0\" cellpadding=\"0\" width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv id=\"ProductDetail_TechSpecs_div\"\u003e\n\u003cbr\u003e\n\u003ctable cellpadding=\"0\" cellspacing=\"0\" border=\"1\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"210\"\u003eOptical Design\u003c\/td\u003e\n\u003ctd width=\"400\"\u003eNewtonian\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e250mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e1000mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003eDual speed Crayford-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Length\u003c\/td\u003e\n\u003ctd\u003einches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutside diameter\u003c\/td\u003e\n\u003ctd\u003e12 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA weight\u003c\/td\u003e\n\u003ctd\u003e34lb. 1oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExtension tube\u003c\/td\u003e\n\u003ctd\u003e2\" diameter 35mm L\u003cbr\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eOne year limited\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"iOptron","offers":[{"title":"Default Title","offer_id":41733639503945,"sku":"6313","price":799.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/6313-2T.jpg?v=1725995120"},{"product_id":"celestron-6-rowe-ackermann-schmidt-astrograph-rasa-6-optical-tube-assembly-cg-5-dovetail","title":"Celestron 6” Rowe-Ackermann Schmidt Astrograph (RASA 6) Optical Tube Assembly (CG-5 Dovetail)","description":"\u003ch3 class=\"\" data-end=\"360\" data-start=\"261\"\u003eCelestron RASA 6 Rowe-Ackermann Schmidt Astrograph – f\/2.2 Imaging Power in a Compact Package\u003c\/h3\u003e\n\u003cp class=\"\" data-end=\"699\" data-start=\"362\"\u003eCelestron’s RASA 6 brings the blazing speed and razor-sharp resolution of Rowe-Ackermann Schmidt Astrograph optics to a compact, ultra-portable format. Weighing just 8.4 pounds and sporting a fast f\/2.2 focal ratio, this 6\" astrograph is a deep-sky imaging powerhouse designed for on-the-go astrophotographers and backyard imagers alike.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"1052\" data-start=\"701\"\u003eWith its proven RASA optical design, the 6\" model delivers professional-grade performance in a package small enough to travel with. Whether you're capturing wispy nebulae from a dark-sky site or building a wide-field imaging setup in your backyard, the RASA 6 makes it faster and easier to produce stunning results—no matter where the night takes you.\u003c\/p\u003e\n\u003chr class=\"\" data-end=\"1057\" data-start=\"1054\"\u003e\n\u003ch3 class=\"\" data-end=\"1115\" data-start=\"1059\"\u003eUltra-Fast f\/2.2 Optics for Rapid Deep Sky Imaging\u003c\/h3\u003e\n\u003cp class=\"\" data-end=\"1496\" data-start=\"1117\"\u003eAt the heart of the RASA 6 is Celestron’s proprietary f\/2.2 optical system, engineered to dramatically reduce exposure times. Compared to conventional telescopes, this blazing-fast design allows you to collect more light in less time, making it easier to image faint deep-sky targets like emission nebulae, galaxies, and globular clusters—even under less-than-ideal conditions.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"1883\" data-start=\"1498\"\u003eShorter sub-exposures also mean you can often ditch the autoguider altogether. With a capable equatorial mount, the RASA 6 allows you to achieve crisp, detailed results with minimal fuss. Live-stacking software can turn your setup into a near real-time imaging machine—perfect for public outreach, EAA (Electronically Assisted Astronomy), or simply enjoying your data as it's captured.\u003c\/p\u003e\n\u003chr class=\"\" data-end=\"1888\" data-start=\"1885\"\u003e\n\u003ch3 class=\"\" data-end=\"1941\" data-start=\"1890\"\u003eAdvanced Optics with Sub-Arcsecond Resolution\u003c\/h3\u003e\n\u003cp class=\"\" data-end=\"2380\" data-start=\"1943\"\u003eDespite its modest aperture, the RASA 6 delivers performance that rivals—and often exceeds—much larger and more expensive refractors. A key feature is its ability to produce sub-arcsecond star images across a flat, well-corrected field. When paired with a high-resolution CMOS camera and good sky conditions, the RASA 6 can reveal intricate structures within galaxies and diffuse nebulae, offering a level of detail that belies its size.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"2726\" data-start=\"2382\"\u003eThe optical design accommodates sensors up to 22mm diagonal, making it an ideal match for most popular one-shot-color and mono astro cameras. The result is a generous 3.8° field of view—perfect for framing large targets like the North America Nebula, the California Nebula, the Heart and Soul, or even sprawling star fields along the Milky Way.\u003c\/p\u003e\n\u003chr class=\"\" data-end=\"2731\" data-start=\"2728\"\u003e\n\u003ch3 class=\"\" data-end=\"2776\" data-start=\"2733\"\u003eTrusted by the Pros—Now in Your Hands\u003c\/h3\u003e\n\u003cp class=\"\" data-end=\"3140\" data-start=\"2778\"\u003eOriginally introduced in 2014, the Rowe-Ackermann Schmidt Astrograph line has become a go-to tool for satellite tracking, near-Earth object detection, and advanced astroimaging by professionals and government agencies alike. The RASA 6 continues this legacy by offering the same optical excellence in a format and price point accessible to amateur astronomers.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"3311\" data-start=\"3142\"\u003eThis isn’t just a fast telescope—it’s a serious scientific instrument capable of producing observatory-quality results, whether you're imaging for art, science, or both.\u003c\/p\u003e\n\u003chr class=\"\" data-end=\"3316\" data-start=\"3313\"\u003e\n\u003ch3 class=\"\" data-end=\"3363\" data-start=\"3318\"\u003ePrecision Engineering, Premium Coatings\u003c\/h3\u003e\n\u003cp class=\"\" data-end=\"3609\" data-start=\"3365\"\u003eThe RASA 6 employs a sophisticated optical layout including a Schmidt corrector plate, high-precision spherical primary mirror, and a rare-earth glass three-element lens group—all optimized for pinpoint star images and flat-field performance.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"3919\" data-start=\"3611\"\u003eCelestron's StarBright XLT coatings are applied to all optical surfaces, maximizing light throughput and enhancing image contrast. These coatings ensure you capture the most light possible across the visual and near-infrared spectrum, preserving subtle structures and delicate gradients in your final images.\u003c\/p\u003e\n\u003chr class=\"\" data-end=\"3924\" data-start=\"3921\"\u003e\n\u003ch3 class=\"\" data-end=\"3971\" data-start=\"3926\"\u003eBuilt-In Flexibility and Smart Features\u003c\/h3\u003e\n\u003cp class=\"\" data-end=\"4150\" data-start=\"3973\"\u003eCelestron didn’t just design a telescope—they engineered a complete imaging platform. The RASA 6 comes loaded with features that make imaging easier, cleaner, and more reliable.\u003c\/p\u003e\n\u003cul data-end=\"4785\" data-start=\"4152\"\u003e\n\u003cli class=\"\" data-end=\"4339\" data-start=\"4152\"\u003e\n\u003cp class=\"\" data-end=\"4339\" data-start=\"4154\"\u003e\u003cstrong data-end=\"4179\" data-start=\"4154\"\u003eFilter Drawer System:\u003c\/strong\u003e Accepts 1.25\" and 2\" filters and includes a removable 2\" clear optical window. Easily swap filters without disrupting your setup or adding optical path errors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"\" data-end=\"4508\" data-start=\"4340\"\u003e\n\u003cp class=\"\" data-end=\"4508\" data-start=\"4342\"\u003e\u003cstrong data-end=\"4358\" data-start=\"4342\"\u003eCooling Fan:\u003c\/strong\u003e A quiet 12V MagLev fan brings the system down to ambient temperature quickly while minimizing dust intake—ideal for night-to-night thermal stability.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"\" data-end=\"4644\" data-start=\"4509\"\u003e\n\u003cp class=\"\" data-end=\"4644\" data-start=\"4511\"\u003e\u003cstrong data-end=\"4539\" data-start=\"4511\"\u003eCamera Adapter Included:\u003c\/strong\u003e The M42-threaded adapter offers broad compatibility with many popular astronomy cameras and accessories.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"\" data-end=\"4785\" data-start=\"4645\"\u003e\n\u003cp class=\"\" data-end=\"4785\" data-start=\"4647\"\u003e\u003cstrong data-end=\"4669\" data-start=\"4647\"\u003eCG-5 Dovetail Bar:\u003c\/strong\u003e Mounts easily to any standard Vixen-style saddle, ensuring compatibility with most equatorial mounts on the market.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"\" data-end=\"4790\" data-start=\"4787\"\u003e\n\u003ch3 class=\"\" data-end=\"4821\" data-start=\"4792\"\u003eRecommended Accessories\u003c\/h3\u003e\n\u003cp class=\"\" data-end=\"4930\" data-start=\"4823\"\u003eTo get the most out of your RASA 6, consider pairing it with these Celestron accessories (sold separately):\u003c\/p\u003e\n\u003cul data-end=\"5259\" data-start=\"4932\"\u003e\n\u003cli class=\"\" data-end=\"5030\" data-start=\"4932\"\u003e\n\u003cp class=\"\" data-end=\"5030\" data-start=\"4934\"\u003e\u003cstrong data-end=\"4960\" data-start=\"4934\"\u003eCelestron Focus Motor:\u003c\/strong\u003e Enables remote, computer-controlled focusing with pinpoint precision.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"\" data-end=\"5143\" data-start=\"5031\"\u003e\n\u003cp class=\"\" data-end=\"5143\" data-start=\"5033\"\u003e\u003cstrong data-end=\"5063\" data-start=\"5033\"\u003e6” Dew Shield or Dew Ring:\u003c\/strong\u003e Prevents moisture build-up on the corrector plate during long imaging sessions.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"\" data-end=\"5259\" data-start=\"5144\"\u003e\n\u003cp class=\"\" data-end=\"5259\" data-start=\"5146\"\u003e\u003cstrong data-end=\"5174\" data-start=\"5146\"\u003eRASA 6 Padded Carry Bag:\u003c\/strong\u003e A dedicated, form-fitting soft case to protect your scope during travel and storage.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"\" data-end=\"5264\" data-start=\"5261\"\u003e\n\u003ch3 class=\"\" data-end=\"5308\" data-start=\"5266\"\u003ePerformance That Outpaces Refractors\u003c\/h3\u003e\n\u003cp class=\"\" data-end=\"5636\" data-start=\"5310\"\u003eIn terms of light grasp, focal speed, and resolution per dollar, the RASA 6 is in a class of its own. Compared to similarly priced refractors—many of which top out at f\/5 to f\/7 and require expensive flatteners—the RASA 6 offers greater sensitivity, faster results, and superior imaging potential for wide-field deep-sky work.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"5874\" data-start=\"5638\"\u003eIf you're looking for a second scope to complement your long focal length rig, or if you're ready to jump into astrophotography with a system that delivers breathtaking results from day one, the RASA 6 should be at the top of your list.\u003c\/p\u003e\n\u003chr class=\"\" data-end=\"5879\" data-start=\"5876\"\u003e\n\u003ch3 class=\"\" data-end=\"5897\" data-start=\"5881\"\u003eIn Summary\u003c\/h3\u003e\n\u003cp class=\"\" data-end=\"6222\" data-start=\"5899\"\u003eThe \u003cstrong data-end=\"5957\" data-start=\"5903\"\u003eCelestron RASA 6 Rowe-Ackermann Schmidt Astrograph\u003c\/strong\u003e is the ideal fusion of speed, performance, and portability. Its ultra-fast f\/2.2 optics make deep-sky imaging faster and more accessible, while its compact footprint and smart design features make it easy to transport, set up, and adapt to your imaging workflow.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"6454\" data-start=\"6224\"\u003eWhether you're a seasoned astrophotographer looking for a wide-field solution or a beginner ready to capture stunning deep-space images without long hours of tracking, the RASA 6 opens the door to a universe of creative potential.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable class=\"table-open\" id=\"product-specs-list\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical Tube Info:\u003c\/th\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design:\u003c\/td\u003e\n\u003ctd\u003eRowe-Ackermann Schmidt Astrograph\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture:\u003c\/td\u003e\n\u003ctd\u003e152mm (5.98\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length:\u003c\/td\u003e\n\u003ctd\u003e335mm (13.18\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio:\u003c\/td\u003e\n\u003ctd\u003ef\/2.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCentral obstruction diameter:\u003c\/td\u003e\n\u003ctd\u003e77mm (3.03\") (46% of aperture diameter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering Power (Compared to human eye):\u003c\/td\u003e\n\u003ctd\u003e472x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Rayleigh):\u003c\/td\u003e\n\u003ctd\u003e0.91 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Dawes):\u003c\/td\u003e\n\u003ctd\u003e0.76 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle:\u003c\/td\u003e\n\u003ctd\u003e16mm (0.63\") Ø, 2.74°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUseable field:\u003c\/td\u003e\n\u003ctd\u003e22mm (0.86\") Ø, 3.76°, only minimal performance loss at edge of FOV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength range:\u003c\/td\u003e\n\u003ctd\u003e400 - 700 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpot size:\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 1.5 μm RMS across image circle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings:\u003c\/td\u003e\n\u003ctd\u003eStarBright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOff-axis Illumination:\u003c\/td\u003e\n\u003ctd\u003e91% at 8mm (0.31\") off-axis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack focus with included camera adapter:\u003c\/td\u003e\n\u003ctd\u003e17.5mm (0.69\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube:\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Length:\u003c\/td\u003e\n\u003ctd\u003e609.6mm (24\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Diameter:\u003c\/td\u003e\n\u003ctd\u003e177.8mm (7\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser:\u003c\/td\u003e\n\u003ctd\u003eStandard Schmidt-Cassegrain focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinderscope:\u003c\/td\u003e\n\u003ctd\u003eNot included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Weight:\u003c\/td\u003e\n\u003ctd\u003e8.4 lbs (3.8 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOther Features:\u003c\/td\u003e\n\u003ctd\u003eAir-cooling system, integrated filter mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded items:\u003c\/td\u003e\n\u003ctd\u003e42mm (1.65\") T-thread camera adapter\u003cbr\u003eFan battery pack\u003cbr\u003eFilter drawer with 2\" clear filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail:\u003c\/td\u003e\n\u003ctd\u003eCG-5 Dovetail Bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Drawer:\u003c\/td\u003e\n\u003ctd\u003eAccept 2\" format filters, includes 1.25\" filter adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Filter:\u003c\/td\u003e\n\u003ctd\u003e2\" filter, removable, AR coatings, 2mm glass thickness\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCooling Fan:\u003c\/td\u003e\n\u003ctd\u003e12V DC, MagLev\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Mounting Threads:\u003c\/td\u003e\n\u003ctd\u003eM42\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSolar Warning\u003c\/td\u003e\n\u003ctd class=\"solar-warning\"\u003e\n\u003cul class=\"solar-warning-text\"\u003e\n\u003cli\u003eNever look directly at the Sun with the naked eye or with an optic (unless you have the proper solar filter). Permanent and irreversible eye damage may result.\u003c\/li\u003e\n\u003cli\u003eNever use your optic to project an image of the Sun onto any surface. Internal heat build-up can damage the optic and any accessories attached to it.\u003c\/li\u003e\n\u003cli\u003eNever leave your optic unsupervised. Make sure an adult who is familiar with the correct operating procedures is with your optic at all times, especially when children are present.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":54335965200457,"sku":"91071","price":1699.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/91071_6in_Rowe-Ackermann_Schmidt_Astrograph_01_570x380_2x_78df67cc-314d-47db-baae-91654c6015b9.webp?v=1743085197"},{"product_id":"celestron-advanced-vx-600-6-rasa-goto-astrograph","title":"Celestron Advanced VX 6\" RASA GoTo Astrograph","description":"\u003ch3 data-start=\"261\" data-end=\"360\" class=\"\"\u003eCelestron RASA 6 Rowe-Ackermann Schmidt Astrograph – f\/2.2 Imaging Power in a Compact Package\u003c\/h3\u003e\n\u003cp data-start=\"362\" data-end=\"699\" class=\"\"\u003eCelestron’s RASA 6 brings the blazing speed and razor-sharp resolution of Rowe-Ackermann Schmidt Astrograph optics to a compact, ultra-portable format. Weighing just 8.4 pounds and sporting a fast f\/2.2 focal ratio, this 6\" astrograph is a deep-sky imaging powerhouse designed for on-the-go astrophotographers and backyard imagers alike.\u003c\/p\u003e\n\u003cp data-start=\"701\" data-end=\"1052\" class=\"\"\u003eWith its proven RASA optical design, the 6\" model delivers professional-grade performance in a package small enough to travel with. Whether you're capturing wispy nebulae from a dark-sky site or building a wide-field imaging setup in your backyard, the RASA 6 makes it faster and easier to produce stunning results—no matter where the night takes you.\u003c\/p\u003e\n\u003chr data-start=\"1054\" data-end=\"1057\" class=\"\"\u003e\n\u003ch3 data-start=\"1059\" data-end=\"1115\" class=\"\"\u003eUltra-Fast f\/2.2 Optics for Rapid Deep Sky Imaging\u003c\/h3\u003e\n\u003cp data-start=\"1117\" data-end=\"1496\" class=\"\"\u003eAt the heart of the RASA 6 is Celestron’s proprietary f\/2.2 optical system, engineered to dramatically reduce exposure times. Compared to conventional telescopes, this blazing-fast design allows you to collect more light in less time, making it easier to image faint deep-sky targets like emission nebulae, galaxies, and globular clusters—even under less-than-ideal conditions.\u003c\/p\u003e\n\u003cp data-start=\"1498\" data-end=\"1883\" class=\"\"\u003eShorter sub-exposures also mean you can often ditch the autoguider altogether. With a capable equatorial mount, the RASA 6 allows you to achieve crisp, detailed results with minimal fuss. Live-stacking software can turn your setup into a near real-time imaging machine—perfect for public outreach, EAA (Electronically Assisted Astronomy), or simply enjoying your data as it's captured.\u003c\/p\u003e\n\u003chr data-start=\"1885\" data-end=\"1888\" class=\"\"\u003e\n\u003ch3 data-start=\"1890\" data-end=\"1941\" class=\"\"\u003eAdvanced Optics with Sub-Arcsecond Resolution\u003c\/h3\u003e\n\u003cp data-start=\"1943\" data-end=\"2380\" class=\"\"\u003eDespite its modest aperture, the RASA 6 delivers performance that rivals—and often exceeds—much larger and more expensive refractors. A key feature is its ability to produce sub-arcsecond star images across a flat, well-corrected field. When paired with a high-resolution CMOS camera and good sky conditions, the RASA 6 can reveal intricate structures within galaxies and diffuse nebulae, offering a level of detail that belies its size.\u003c\/p\u003e\n\u003cp data-start=\"2382\" data-end=\"2726\" class=\"\"\u003eThe optical design accommodates sensors up to 22mm diagonal, making it an ideal match for most popular one-shot-color and mono astro cameras. The result is a generous 3.8° field of view—perfect for framing large targets like the North America Nebula, the California Nebula, the Heart and Soul, or even sprawling star fields along the Milky Way.\u003c\/p\u003e\n\u003chr data-start=\"2728\" data-end=\"2731\" class=\"\"\u003e\n\u003ch3 data-start=\"2733\" data-end=\"2776\" class=\"\"\u003eTrusted by the Pros—Now in Your Hands\u003c\/h3\u003e\n\u003cp data-start=\"2778\" data-end=\"3140\" class=\"\"\u003eOriginally introduced in 2014, the Rowe-Ackermann Schmidt Astrograph line has become a go-to tool for satellite tracking, near-Earth object detection, and advanced astroimaging by professionals and government agencies alike. The RASA 6 continues this legacy by offering the same optical excellence in a format and price point accessible to amateur astronomers.\u003c\/p\u003e\n\u003cp data-start=\"3142\" data-end=\"3311\" class=\"\"\u003eThis isn’t just a fast telescope—it’s a serious scientific instrument capable of producing observatory-quality results, whether you're imaging for art, science, or both.\u003c\/p\u003e\n\u003chr data-start=\"3313\" data-end=\"3316\" class=\"\"\u003e\n\u003ch3 data-start=\"3318\" data-end=\"3363\" class=\"\"\u003ePrecision Engineering, Premium Coatings\u003c\/h3\u003e\n\u003cp data-start=\"3365\" data-end=\"3609\" class=\"\"\u003eThe RASA 6 employs a sophisticated optical layout including a Schmidt corrector plate, high-precision spherical primary mirror, and a rare-earth glass three-element lens group—all optimized for pinpoint star images and flat-field performance.\u003c\/p\u003e\n\u003cp data-start=\"3611\" data-end=\"3919\" class=\"\"\u003eCelestron's StarBright XLT coatings are applied to all optical surfaces, maximizing light throughput and enhancing image contrast. These coatings ensure you capture the most light possible across the visual and near-infrared spectrum, preserving subtle structures and delicate gradients in your final images.\u003c\/p\u003e\n\u003chr data-start=\"3921\" data-end=\"3924\" class=\"\"\u003e\n\u003ch3 data-start=\"3926\" data-end=\"3971\" class=\"\"\u003eBuilt-In Flexibility and Smart Features\u003c\/h3\u003e\n\u003cp data-start=\"3973\" data-end=\"4150\" class=\"\"\u003eCelestron didn’t just design a telescope—they engineered a complete imaging platform. The RASA 6 comes loaded with features that make imaging easier, cleaner, and more reliable.\u003c\/p\u003e\n\u003cul data-start=\"4152\" data-end=\"4785\"\u003e\n\u003cli data-start=\"4152\" data-end=\"4339\" class=\"\"\u003e\n\u003cp data-start=\"4154\" data-end=\"4339\" class=\"\"\u003e\u003cstrong data-start=\"4154\" data-end=\"4179\"\u003eFilter Drawer System:\u003c\/strong\u003e Accepts 1.25\" and 2\" filters and includes a removable 2\" clear optical window. Easily swap filters without disrupting your setup or adding optical path errors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4340\" data-end=\"4508\" class=\"\"\u003e\n\u003cp data-start=\"4342\" data-end=\"4508\" class=\"\"\u003e\u003cstrong data-start=\"4342\" data-end=\"4358\"\u003eCooling Fan:\u003c\/strong\u003e A quiet 12V MagLev fan brings the system down to ambient temperature quickly while minimizing dust intake—ideal for night-to-night thermal stability.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4509\" data-end=\"4644\" class=\"\"\u003e\n\u003cp data-start=\"4511\" data-end=\"4644\" class=\"\"\u003e\u003cstrong data-start=\"4511\" data-end=\"4539\"\u003eCamera Adapter Included:\u003c\/strong\u003e The M42-threaded adapter offers broad compatibility with many popular astronomy cameras and accessories.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4645\" data-end=\"4785\" class=\"\"\u003e\n\u003cp data-start=\"4647\" data-end=\"4785\" class=\"\"\u003e\u003cstrong data-start=\"4647\" data-end=\"4669\"\u003eCG-5 Dovetail Bar:\u003c\/strong\u003e Mounts easily to any standard Vixen-style saddle, ensuring compatibility with most equatorial mounts on the market.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4787\" data-end=\"4790\" class=\"\"\u003e\n\u003ch3 data-start=\"4792\" data-end=\"4821\" class=\"\"\u003eRecommended Accessories\u003c\/h3\u003e\n\u003cp data-start=\"4823\" data-end=\"4930\" class=\"\"\u003eTo get the most out of your RASA 6, consider pairing it with these Celestron accessories (sold separately):\u003c\/p\u003e\n\u003cul data-start=\"4932\" data-end=\"5259\"\u003e\n\u003cli data-start=\"4932\" data-end=\"5030\" class=\"\"\u003e\n\u003cp data-start=\"4934\" data-end=\"5030\" class=\"\"\u003e\u003cstrong data-start=\"4934\" data-end=\"4960\"\u003eCelestron Focus Motor:\u003c\/strong\u003e Enables remote, computer-controlled focusing with pinpoint precision.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5031\" data-end=\"5143\" class=\"\"\u003e\n\u003cp data-start=\"5033\" data-end=\"5143\" class=\"\"\u003e\u003cstrong data-start=\"5033\" data-end=\"5063\"\u003e6” Dew Shield or Dew Ring:\u003c\/strong\u003e Prevents moisture build-up on the corrector plate during long imaging sessions.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5144\" data-end=\"5259\" class=\"\"\u003e\n\u003cp data-start=\"5146\" data-end=\"5259\" class=\"\"\u003e\u003cstrong data-start=\"5146\" data-end=\"5174\"\u003eRASA 6 Padded Carry Bag:\u003c\/strong\u003e A dedicated, form-fitting soft case to protect your scope during travel and storage.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"5261\" data-end=\"5264\" class=\"\"\u003e\n\u003ch3 data-start=\"5266\" data-end=\"5308\" class=\"\"\u003ePerformance That Outpaces Refractors\u003c\/h3\u003e\n\u003cp data-start=\"5310\" data-end=\"5636\" class=\"\"\u003eIn terms of light grasp, focal speed, and resolution per dollar, the RASA 6 is in a class of its own. Compared to similarly priced refractors—many of which top out at f\/5 to f\/7 and require expensive flatteners—the RASA 6 offers greater sensitivity, faster results, and superior imaging potential for wide-field deep-sky work.\u003c\/p\u003e\n\u003cp data-start=\"5638\" data-end=\"5874\" class=\"\"\u003eIf you're looking for a second scope to complement your long focal length rig, or if you're ready to jump into astrophotography with a system that delivers breathtaking results from day one, the RASA 6 should be at the top of your list.\u003c\/p\u003e\n\u003cp data-start=\"5899\" data-end=\"6222\" class=\"\"\u003eThe \u003cstrong data-start=\"5903\" data-end=\"5957\"\u003eCelestron RASA 6 Rowe-Ackermann Schmidt Astrograph\u003c\/strong\u003e is the ideal fusion of speed, performance, and portability. Its ultra-fast f\/2.2 optics make deep-sky imaging faster and more accessible, while its compact footprint and smart design features make it easy to transport, set up, and adapt to your imaging workflow.\u003c\/p\u003e\n\u003cp data-start=\"6224\" data-end=\"6454\" class=\"\"\u003eWhether you're a seasoned astrophotographer looking for a wide-field solution or a beginner ready to capture stunning deep-space images without long hours of tracking, the RASA 6 opens the door to a universe of creative potential.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAdvanced VX \u0026amp; Tripod\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Advanced VX mount is designed to provide superior performance for smaller telescopes while taking advantage of Celestron’s most advanced technologies: All-Star Polar Alignment, Celestron PWI telescope control software, SkyAlign, and permanently programmable periodic error correction (PPEC).\u003c\/p\u003e\n\u003cp\u003eIf you’re an experienced imager, you’ll love taking this portable mount to a dark sky site and enjoying all the conveniences of a larger observatory mount. Or, if you’re new to imaging, Advanced VX will help you get started with the hobby and keep up with your needs for years to come.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eComputerized German equatorial moun\u003c\/strong\u003et\u003c\/p\u003e\n\u003cp\u003eThe Advanced VX is the smallest of Celestron’s German equatorial mounts. The computerized GoTo capability automatically tracks objects as they move across the night sky. The Advanced VX mount includes ports for a hand control, an autoguider, and 2 AUX ports for optional accessories. The NexStar+ hand control gives you instant access to all the functions your mount has to offer. With automatic slewing and menu descriptions, astronomers of all skill levels can master this mount in just a few observing sessions. The Advanced VX also has an impressive tripod for its class with 2”-diameter steel tripod legs, providing an extra-wide stance for improved stability.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePayload capacity\u003c\/strong\u003e\u003cbr\u003eThe payload capacity for the Advanced VX is 30 lb. It offers a sturdy platform for the 8” Rowe-Ackermann Schmidt Astrograph optical tube, even when paired with optional accessories like StarSense AutoAlign, Focus Motor, a finderscope, and a camera. Celestron's payload capacity does not include the weight of the counterweights.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDual saddle plate\u003c\/strong\u003e\u003cbr\u003eAs of early 2019, Advanced VX mounts now include a new dual saddle plate that accommodates both CG-5 and CGE-style dovetails. Switching between the two saddle plates is as simple as moving the hand knobs into a separate set of holes. Now you can use your Advanced VX mount not only with the 8” RASA, but virtually any optical tube within Advanced VX’s weight limit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSoftware\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCelestron PWI Telescope Control Software\u003cbr\u003eYour Ultimate Astronomy Software Suite\u003c\/p\u003e\n\u003cp\u003eAll current Celestron computerized telescopes include Celestron PWI (CPWI), the most advanced astronomy software suite provided with any consumer-grade telescope. Celestron’s experts co-developed CPWI with the engineers at PlaneWave Instruments. The result is an all-in-one solution offering you many of the same features used on PlaneWave’s observatory-class telescopes.\u003c\/p\u003e\n\u003cp\u003eGraphical planetarium interface with PointXP advanced mount modelling allows you to add 100+ points to your alignment model for the most accurate pointing and tracking possible\u003cbr\u003eIdeal for remote observatory setups: save and re-load your alignment and park your scope\u003cbr\u003eProvides a complete ASCOM telescope interface to allow control of the telescope from third party software applications\u003cbr\u003eFor more information on CPWI and to see the user interface, click here.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStarry Night Software\u003c\/strong\u003e\u003cbr\u003eAlso included with your purchase is a free download of Celestron’s Starry Night Special Edition Software. This advanced software by Simulation Curriculum offers detailed information about celestial objects and helps you plan your next observing or imaging session. The Special Edition software also includes telescope control via your PC.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAccessories Included\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Advanced VX RASA 8 comes complete with a M42 camera adapter, C-thread camera adapter, and fan battery pack.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable class=\"table-open\" id=\"product-specs-list\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical Tube Info:\u003c\/th\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design:\u003c\/td\u003e\n\u003ctd\u003eRowe-Ackermann Schmidt Astrograph\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture:\u003c\/td\u003e\n\u003ctd\u003e152mm (5.98\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length:\u003c\/td\u003e\n\u003ctd\u003e335mm (13.18\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio:\u003c\/td\u003e\n\u003ctd\u003ef\/2.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCentral obstruction diameter:\u003c\/td\u003e\n\u003ctd\u003e77mm (3.03\") (46% of aperture diameter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering Power (Compared to human eye):\u003c\/td\u003e\n\u003ctd\u003e472x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Rayleigh):\u003c\/td\u003e\n\u003ctd\u003e0.91 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Dawes):\u003c\/td\u003e\n\u003ctd\u003e0.76 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle:\u003c\/td\u003e\n\u003ctd\u003e16mm (0.63\") Ø, 2.74°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUseable field:\u003c\/td\u003e\n\u003ctd\u003e22mm (0.86\") Ø, 3.76°, only minimal performance loss at edge of FOV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength range:\u003c\/td\u003e\n\u003ctd\u003e400 - 700 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpot size:\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 1.5 μm RMS across image circle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings:\u003c\/td\u003e\n\u003ctd\u003eStarBright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOff-axis Illumination:\u003c\/td\u003e\n\u003ctd\u003e91% at 8mm (0.31\") off-axis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack focus with included camera adapter:\u003c\/td\u003e\n\u003ctd\u003e17.5mm (0.69\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube:\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Length:\u003c\/td\u003e\n\u003ctd\u003e609.6mm (24\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Diameter:\u003c\/td\u003e\n\u003ctd\u003e177.8mm (7\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser:\u003c\/td\u003e\n\u003ctd\u003eStandard Schmidt-Cassegrain focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinderscope:\u003c\/td\u003e\n\u003ctd\u003eNot included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Weight:\u003c\/td\u003e\n\u003ctd\u003e8.4 lbs (3.8 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOther Features:\u003c\/td\u003e\n\u003ctd\u003eAir-cooling system, integrated filter mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded items:\u003c\/td\u003e\n\u003ctd\u003e42mm (1.65\") T-thread camera adapter\u003cbr\u003eFan battery pack\u003cbr\u003eFilter drawer with 2\" clear filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail:\u003c\/td\u003e\n\u003ctd\u003eCG-5 Dovetail Bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Drawer:\u003c\/td\u003e\n\u003ctd\u003eAccept 2\" format filters, includes 1.25\" filter adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Filter:\u003c\/td\u003e\n\u003ctd\u003e2\" filter, removable, AR coatings, 2mm glass thickness\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCooling Fan:\u003c\/td\u003e\n\u003ctd\u003e12V DC, MagLev\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Mounting Threads:\u003c\/td\u003e\n\u003ctd\u003eM42\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eMount Info:\u003c\/th\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount Type:\u003c\/td\u003e\n\u003ctd\u003eComputerized Equatorial\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstrument load capacity:\u003c\/td\u003e\n\u003ctd\u003e30 lbs (13.6 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight adjustment range (includes mount and tripod):\u003c\/td\u003e\n\u003ctd\u003e1118mm - 1626mm (44\" – 64\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTripod Leg Diameter:\u003c\/td\u003e\n\u003ctd\u003e50.8mm (2\") Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLatitude adjustment range:\u003c\/td\u003e\n\u003ctd\u003e7° - 77°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount Head Weight:\u003c\/td\u003e\n\u003ctd\u003e17 lbs (7.71 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory Tray:\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTripod Weight:\u003c\/td\u003e\n\u003ctd\u003e18 lbs (8.16 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight of Counterweights:\u003c\/td\u003e\n\u003ctd\u003e1 x 12 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSlew Speeds:\u003c\/td\u003e\n\u003ctd\u003e9 slew speeds - max speed 4°\/second\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTracking Rates:\u003c\/td\u003e\n\u003ctd\u003eSidereal, Solar and Lunar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTracking Modes:\u003c\/td\u003e\n\u003ctd\u003eEQ North and EQ South\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGPS:\u003c\/td\u003e\n\u003ctd\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail Compatibility:\u003c\/td\u003e\n\u003ctd\u003eDual saddle plates (CG-5 and CGE saddle)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Auxiliary Ports:\u003c\/td\u003e\n\u003ctd\u003e3 AUX Ports (1 hand control and 2 AUX Ports for optional accessories)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAutoguide Port:\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUSB Port:\u003c\/td\u003e\n\u003ctd\u003eYes, input on Hand Control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Requirements:\u003c\/td\u003e\n\u003ctd\u003e12V DC 3.5A (tip positive)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor Drive:\u003c\/td\u003e\n\u003ctd\u003eDC servo motors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAlignment Procedures:\u003c\/td\u003e\n\u003ctd\u003e2-Star Align, 1-Star Align, Solar System Align, Last Alignment, Quick Align\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeriodic Error Correction:\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eComputerized Hand Control:\u003c\/td\u003e\n\u003ctd\u003eNexStar+ hand control with LCD display, 19 fiber-optic backlit LED buttons\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNexStar+ Database:\u003c\/td\u003e\n\u003ctd\u003e40,000+ objects, 100 user defined programmable objects. Enhanced information on over 200 objects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSoftware:\u003c\/td\u003e\n\u003ctd\u003eCelestron Starry Night Special Edition Software, CPWI, and SkyPortal App\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Kit Weight:\u003c\/td\u003e\n\u003ctd\u003e55.4 lbs (25.13 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSolar Warning\u003c\/td\u003e\n\u003ctd class=\"solar-warning\"\u003e\n\u003cul class=\"solar-warning-text\"\u003e\n\u003cli\u003eNever look directly at the Sun with the naked eye or with an optic (unless you have the proper solar filter). Permanent and irreversible eye damage may result.\u003c\/li\u003e\n\u003cli\u003eNever use your optic to project an image of the Sun onto any surface. Internal heat build-up can damage the optic and any accessories attached to it.\u003c\/li\u003e\n\u003cli\u003eNever leave your optic unsupervised. Make sure an adult who is familiar with the correct operating procedures is with your optic at all times, especially when children are present.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eSupplied Accessories: \u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe Advanced VX RASA 8 comes complete with a M42 camera adapter, C-thread camera adapter, and fan battery pack.\u003c\/span\u003e\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":54335982567497,"sku":"12036","price":2399.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/12026_Advanced_VX_6in_Rowe-Ackermann_Schmidt_Astrograph_01_570x380_2x_394e96ba-35f8-42eb-9e62-677539c57887.webp?v=1743086884"},{"product_id":"sky-watcher-hac125dx-5-minigraph","title":"Sky-Watcher HAC125DX 5\" Minigraph","description":"\u003cp data-start=\"205\" data-end=\"293\" class=\"\"\u003e\u003cstrong data-start=\"205\" data-end=\"275\"\u003eSky-Watcher HAC125DX Monograph – Ultra-Compact f\/2 Mini Astrograph\u003c\/strong\u003e\u003cbr data-start=\"275\" data-end=\"278\"\u003e\u003cstrong data-start=\"278\" data-end=\"293\"\u003eSKU: S11250\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"295\" data-end=\"779\" class=\"\"\u003eThe Sky-Watcher HAC125DX Monograph is a revolutionary evolution in portable astrographs—delivering extraordinary speed, precision, and portability in an 8.4-pound optical tube that fits in the palm of your hand. Designed around the rare and elegant Honders Advanced Catadioptric (HAC) optical system, the HAC125DX combines cutting-edge hybrid optics with practical mechanical refinements for astrophotographers seeking high-quality images without the bulk or fuss of traditional gear.\u003c\/p\u003e\n\u003ch3 data-start=\"781\" data-end=\"810\" class=\"\"\u003eUltra-Fast, Ultra-Compact\u003c\/h3\u003e\n\u003cp data-start=\"812\" data-end=\"1256\" class=\"\"\u003eAt an incredible f\/2 focal ratio, the HAC125DX is one of the fastest production astrographs in existence. This 250mm focal length optic captures more photons per second than conventional small refractors or Ritchey-Chrétien systems, allowing you to achieve deep exposures in a fraction of the time. That translates to shorter imaging sessions, less stress on your tracking accuracy, and quicker setup-and-go when your observing window is short.\u003c\/p\u003e\n\u003cp data-start=\"1258\" data-end=\"1608\" class=\"\"\u003eWith a total length of just 15.7 inches and a lightweight aluminum tube, the HAC125DX is the ideal companion for portable equatorial mounts. Its 5-inch (125mm) aperture delivers impressive light-gathering power for its size—collecting 56% more light than a 100mm scope—while the compact build allows it to ride on modest tracking platforms with ease.\u003c\/p\u003e\n\u003ch3 data-start=\"1610\" data-end=\"1661\" class=\"\"\u003eHonders Optical Design: Pure Imaging Efficiency\u003c\/h3\u003e\n\u003cp data-start=\"1663\" data-end=\"2046\" class=\"\"\u003eThe Honders optical system is a rare breed in the telescope world—combining a Mangin mirror with carefully engineered refractive corrector elements to produce pinpoint stars and flat-field performance in an incredibly short tube. The result is a diffraction-limited system with minimal chromatic aberration and tight control of off-axis coma, perfect for wide-field astrophotography.\u003c\/p\u003e\n\u003cp data-start=\"1663\" data-end=\"2046\" class=\"\"\u003eThis redesigned DX version introduces rear primary mirror focusing—a welcome upgrade from the original HAC125—improving compatibility with a wide range of imaging setups and making precise focusing easier when the telescope is mounted.\u003c\/p\u003e\n\u003cp data-start=\"2421\" data-end=\"2682\" class=\"\"\u003eThe optical path features Sky-Watcher’s proprietary Radiant Aluminum Quartz (RAQ™) coatings, offering 94% reflectivity for optimal throughput. All corrector lenses are treated with High Transmission Multi-Coatings (HTMC™) to ensure maximum clarity and contrast.\u003c\/p\u003e\n\u003ch3 data-start=\"2684\" data-end=\"2734\" class=\"\"\u003eBuilt for Imaging, Engineered for Practicality\u003c\/h3\u003e\n\u003cp data-start=\"2736\" data-end=\"3112\" class=\"\"\u003eThe HAC125DX provides a 16mm image circle, making it an excellent match for popular imaging sensors like the IMX533 and IMX585. Whether you’re capturing nebulae, dense star fields, or sweeping wide-field mosaics, this astrograph delivers rich, sharp results across the field. Though the image circle is not full-frame, it's well suited for many current CMOS astronomy cameras.\u003c\/p\u003e\n\u003cp data-start=\"3114\" data-end=\"3534\" class=\"\"\u003eIts integrated clamshell ring assembly includes a Vixen-style dovetail for compatibility with a wide range of mounts and saddles. Dual finder scope brackets provide flexibility for mounting guide scopes, electronic focusers, or other accessories. Camera connectivity is streamlined thanks to the included 1.25\" adapter and M42x0.75 thread adapter, ensuring compatibility with many astronomy cameras right out of the box.\u003c\/p\u003e\n\u003cp data-start=\"3536\" data-end=\"3775\" class=\"\"\u003eDespite its performance-focused design, the HAC125DX doesn’t skip on durability or handling. The precision-machined optical tube and rugged finish make this a travel-friendly scope you won’t hesitate to bring on the road—or into the field.\u003c\/p\u003e\n\u003ch3 data-start=\"3777\" data-end=\"3801\" class=\"\"\u003eSummary of Features:\u003c\/h3\u003e\n\u003cul data-start=\"3803\" data-end=\"4482\"\u003e\n\u003cli data-start=\"3803\" data-end=\"3863\" class=\"\"\u003e\n\u003cp data-start=\"3805\" data-end=\"3863\" class=\"\"\u003e125mm aperture with f\/2 focal ratio (250mm focal length)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3864\" data-end=\"3931\" class=\"\"\u003e\n\u003cp data-start=\"3866\" data-end=\"3931\" class=\"\"\u003eHonders Advanced Catadioptric optical design with Mangin mirror\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3932\" data-end=\"4000\" class=\"\"\u003e\n\u003cp data-start=\"3934\" data-end=\"4000\" class=\"\"\u003eRadiant Aluminum Quartz (RAQ™) mirror coatings, 94% reflectivity\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4001\" data-end=\"4067\" class=\"\"\u003e\n\u003cp data-start=\"4003\" data-end=\"4067\" class=\"\"\u003eHigh Transmission Multi-Coatings (HTMC™) on corrector elements\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4068\" data-end=\"4146\" class=\"\"\u003e\n\u003cp data-start=\"4070\" data-end=\"4146\" class=\"\"\u003e16mm image circle optimized for modern CMOS sensors (e.g., IMX533, IMX585)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4147\" data-end=\"4198\" class=\"\"\u003e\n\u003cp data-start=\"4149\" data-end=\"4198\" class=\"\"\u003eLightweight 8.4 lbs tube, only 15.7 inches long\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4199\" data-end=\"4261\" class=\"\"\u003e\n\u003cp data-start=\"4201\" data-end=\"4261\" class=\"\"\u003eCollimatable primary mirror cell with rear focuser\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4262\" data-end=\"4328\" class=\"\"\u003e\n\u003cp data-start=\"4264\" data-end=\"4328\" class=\"\"\u003eClamshell rings with V-style dovetail and dual finder brackets\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4329\" data-end=\"4396\" class=\"\"\u003e\n\u003cp data-start=\"4331\" data-end=\"4396\" class=\"\"\u003eIncluded adapters: 1.25\" visual back and M42x0.75 camera thread\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4397\" data-end=\"4482\" class=\"\"\u003e\n\u003cp data-start=\"4399\" data-end=\"4482\" class=\"\"\u003eIdeal for wide-field imaging, travel astrophotography, and ultra-fast acquisition\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"4484\" data-end=\"4512\" class=\"\"\u003eThe Astrograph Redefined\u003c\/h3\u003e\n\u003cp data-start=\"4514\" data-end=\"4824\" class=\"\"\u003eThe Sky-Watcher HAC125DX is not just another small imaging scope—it’s a whole new category. It brings the performance of advanced astrographs into a form factor that fits your carry-on luggage. For the astrophotographer who values speed, quality, and true portability, the HAC125DX is a no-compromise solution.\u003c\/p\u003e\n\u003cp data-start=\"4826\" data-end=\"4968\" class=\"\"\u003eTake it under dark skies, pair it with your favorite camera, and discover just how far a 5-inch mini astrograph can take your imaging journey.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003csection class=\"product--container layout--three-col\" data-product-wrapper=\"\"\u003e\n\u003csection class=\"product-section-tabs\" data-product-tabs=\"\"\u003e\n\u003cdiv class=\"product-tabs-content\"\u003e\n\u003cdiv class=\"pdp-content-specs rte active\" data-pdp-tab-content=\"specs\"\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eS11250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e810098970648\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical Specifications\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eHonders Advanced Catadioptric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Coating\u003c\/td\u003e\n\u003ctd\u003eRadiant Aluminum Quartz (RAQ)™ Coatings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflectivity\u003c\/td\u003e\n\u003ctd\u003e0.94\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Type (Monolithic\/Conical\/Fused conical)\u003c\/td\u003e\n\u003ctd\u003eMangin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrector Coating\u003c\/td\u003e\n\u003ctd\u003eHTMC™\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eBorosilicate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e125\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eF\/Ratio\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length (mm)\u003c\/td\u003e\n\u003ctd\u003e250mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e16mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Obstruction by Diameter\u003c\/td\u003e\n\u003ctd\u003e53mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Obstruction by Area\u003c\/td\u003e\n\u003ctd\u003e0.425\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary cell supports (how many support points)\u003c\/td\u003e\n\u003ctd\u003eRear Support\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Quality\u003c\/td\u003e\n\u003ctd\u003eDiffraction limited (1\/4 wave)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCollimatable Cell\u003c\/td\u003e\n\u003ctd\u003ePrimary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eMechanical Specifications\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Type\u003c\/td\u003e\n\u003ctd\u003ePrimary focus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Size\u003c\/td\u003e\n\u003ctd\u003ePrimary Mirror Helical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser: Dual or Single Speed\u003c\/td\u003e\n\u003ctd\u003eSingle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompression Ring\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube length\u003c\/td\u003e\n\u003ctd\u003e15.7 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube diameter\u003c\/td\u003e\n\u003ctd\u003e6.3 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube weight\u003c\/td\u003e\n\u003ctd\u003e8.4 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eAccessories\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded finder\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Hardware\u003c\/td\u003e\n\u003ctd\u003eClamshell rings with V-style dovetail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdditional Accessories\u003c\/td\u003e\n\u003ctd\u003e1.25\" \u0026amp; M42x0.75 camera adapters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManual\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCase\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e10 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e19.3\"x10.6\"x11\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eObservational Info\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDawes Limit\u003c\/td\u003e\n\u003ctd\u003e0.93\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRayleigh Limit\u003c\/td\u003e\n\u003ctd\u003e1.12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Magnitude\u003c\/td\u003e\n\u003ctd\u003e12.96\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gather (compared to next size down)\u003c\/td\u003e\n\u003ctd\u003e56% (compared to 100mm telescope)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntended use\u003c\/td\u003e\n\u003ctd\u003eImaging\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/section\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":54342935150665,"sku":"S11250","price":995.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/S11250_HAC125DX_OTA_LeftFront_1800x1800_1503db36-8889-43ad-a1ae-7924debb1f67.webp?v=1743454934"},{"product_id":"astro-tech-at66edq-f-7-ed-quadruplet-apochromatic-refractor-ota","title":"Astro-Tech AT66EDQ f\/7 ED Quadruplet Apochromatic Refractor OTA","description":"\u003ch2\u003eAstro-Tech AT66EDQ f\/7 ED Quadruplet Apochromatic Refractor\u003c\/h2\u003e\n\u003cp\u003eWide-field astrophotography has one persistent problem: flat fields are hard. Most refractors—even very good ones—need an external field flattener to clean up the corners. Choose the wrong flattener, get the backfocus distance wrong, or grab the wrong extension tube, and you've spent $150 to $300 chasing a problem that shouldn't exist. The AT66EDQ solves this at the source. Its four-element quadruplet design produces a flat, sharp field across a full 43.2mm image circle without any additional accessories. No flattener math. No guesswork. The corners are sharp because the optics are designed that way.\u003c\/p\u003e\n\u003cp\u003eFour elements, two groups, air-spaced throughout—two of those elements are ED glass. One is FK-61, our long-established ED glass and the optical equivalent of Schott's FPL-51. The second is a proprietary glass we've kept confidential, for reasons we don't need to explain to anyone who's been in this hobby long enough. What we can tell you is that together they deliver genuine apochromatic correction across the full 43.2mm field at f\/7: sharp, color-free images without the fringing that follows most fast doublets. The 43.2mm image circle covers any 35mm full-frame sensor and most large-format CMOS imaging chips, which means this scope won't become the bottleneck if your imaging setup grows.\u003c\/p\u003e\n\u003cp\u003eAt 462mm and f\/7, the AT66EDQ is fast enough for broadband imaging without being reckless about focal ratio. Large emission nebulae, galaxy groups, and the sweeping star fields of the Milky Way all land at an agreeable scale. When you want to go wider—or when a faint extended nebula asks for shorter subs—the optional AT66EDQR 0.8× reducer (sold separately) brings the focal length to approximately 370mm at f\/5.6. That's roughly 36% faster, with the flat field intact.\u003c\/p\u003e\n\u003cp\u003eThe focuser doesn't ask you to compromise. A 2.8\" dual-speed rack-and-pinion gives you both the strength to handle a serious imaging train and the precision—via the 10:1 fine-focus knob—to land focus exactly where you need it. The drawtube is graduated in 1mm increments and terminates in a built-in 360° rotation adjuster, so framing changes happen at the focuser, not with a screwdriver at the ring interface. Threading options are extensive: M63, M54, and M48 male threads are all built in, along with a 2\" compression ring adapter with a non-marring brass ring. DSLR and mirrorless cameras connect via a T-ring for your specific mount (sold separately). Dedicated CMOS and CCD astronomy cameras—ZWO, QHY, Player One, and similar—typically have 48mm T-threads built in and connect directly, no T-ring needed. The focuser is also compatible with the ZWO EAF and similar electronic autofocusers.\u003c\/p\u003e\n\u003cp\u003eAt 3.6kg with rings and handle, this scope was sized for the instruments people actually own. It's at home on a harmonic drive like the ZWO AM5 or iOptron HEM27, on a portable platform like the Sky-Watcher Star Adventurer GTi, and in a carry-on bag. It makes a natural wide-field companion to a longer focal length setup—image with the AT66EDQ on one mount while you observe with the bigger scope beside it. The optics are optimized for imaging, but through a wide-field eyepiece and a good diagonal the views are genuinely sharp and color-free. This isn't a scope that makes excuses for its aperture.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eFour-element quadruplet design, air-spaced.\u003c\/strong\u003e Flat-field correction is built into the optics. The 43.2mm image circle is sharp from center to corner without any external accessories. That's the job of a quadruplet, and this one does it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTwo ED glass elements — FK-61 plus one we're not naming.\u003c\/strong\u003e FK-61 is our long-established ED glass (Schott FPL-51 equivalent). The second element is proprietary. Both are there for the same purpose: genuine apochromatic correction at f\/7, across the full field.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFull-frame 43.2mm image circle.\u003c\/strong\u003e Covers all 35mm full-frame sensors and most large-format CMOS chips. The field stays flat and sharp edge-to-edge—critical for wide-field mosaics and large single-frame captures alike.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e2.8\" dual-speed rack-and-pinion focuser, 10:1 fine-focus ratio.\u003c\/strong\u003e Drawtube graduated in 1mm increments. Strong enough for a heavy camera-and-filter-wheel train. Precise enough to nail focus on a pinpoint star at high image scale.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBuilt-in 360° rotation adjuster.\u003c\/strong\u003e Frame adjustment happens at the focuser—no separate rotation adapters needed. Locks securely once you've found your composition.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eM63, M54, and M48 male threads built in.\u003c\/strong\u003e Plus a 2\" compression ring adapter with a non-marring brass ring. DSLR and mirrorless cameras use a T-ring (sold separately); dedicated CMOS and CCD astronomy cameras attach directly via their built-in 48mm T-threads.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eElectronic autofocus ready.\u003c\/strong\u003e Compatible with ZWO EAF and similar motorized autofocuser systems. Supports automated focus sequences and unattended imaging sessions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOptional AT66EDQR 0.8× reducer available.\u003c\/strong\u003e Sold separately. Reduces focal length from 462mm to approximately 370mm and f\/ratio from f\/7 to f\/5.6—about 36% faster. Flat-field correction holds with the reducer in place.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePortable imaging system.\u003c\/strong\u003e 3.6kg total weight with rings and handle. 343mm retracted (13.5\"). Fits harmonic mounts, portable equatorial platforms, and most airline overhead bins.\u003c\/p\u003e\n\u003ch3\u003eUnder the Night Sky\u003c\/h3\u003e\n\u003cp\u003eAt 462mm and f\/7, the AT66EDQ frames the targets that demand a wide field. M42—the Orion Nebula and its surrounding complex—fits with room to include the faint outer nebulosity that narrower scopes cut off. M31 (Andromeda) shows both dust lanes and the extended halo in longer exposures. M45 (Pleiades) frames cleanly with the reflection nebulosity visible against the brighter stars. The North America Nebula (NGC 7000) and the Pelican Nebula (IC 5070) frame together at this focal length. The Heart and Soul Nebulae (IC 1805 and IC 1848) fit in a 2-panel mosaic at 462mm, or in a single full-format frame with the 0.8× reducer.\u003c\/p\u003e\n\u003cp\u003eOpen clusters benefit equally from the flat field. The Beehive (M44), Double Cluster in Perseus, and Pleiades all look right when the stars are sharp to the edge. Visually, through a 2\" wide-field eyepiece, the views are crisp and high-contrast. The aperture is modest. The quality of what it does with that aperture is not.\u003c\/p\u003e\n\u003ch3\u003eObserving Tip\u003c\/h3\u003e\n\u003cp\u003eAim the AT66EDQ at the North America Nebula (NGC 7000) and frame the Cygnus Wall region. At 462mm it covers the full complex on a full-frame sensor—Wall, Gulf, Atlantic together. A narrowband Ha filter and 5-minute subs will pull up the hydrogen-alpha structure in a dozen frames. Add the 0.8× reducer and the Pelican Nebula (IC 5070) drops into the same frame. It's a single target that makes the case for wide-field, flat-field imaging better than any spec sheet can.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the AT66EDQ need a field flattener?\u003c\/strong\u003e\u003cbr\u003eNo. The quadruplet design handles field correction internally. The 43.2mm image circle is flat and sharp across the entire field without any additional accessories. The flattener is built into the glass—that's the whole point of a quadruplet.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the second ED element?\u003c\/strong\u003e\u003cbr\u003eOne element is FK-61, the optical equivalent of Schott's FPL-51. The second is proprietary glass we're not disclosing. The combination delivers genuine apochromatic correction verified across the full 43.2mm image circle. If you want to evaluate it, look at the corners under the stars—that's the honest test.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat cameras does it work with?\u003c\/strong\u003e\u003cbr\u003eDSLR and mirrorless cameras (Canon, Nikon, Sony, Fuji, and others) connect via a T-ring for your specific lens mount, sold separately. Dedicated CMOS and CCD astronomy cameras (ZWO, QHY, Player One, and similar) typically have 48mm T-threads built in and connect directly to the M48 threads on the focuser drawtube—no T-ring needed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the optional reducer do?\u003c\/strong\u003e\u003cbr\u003eThe AT66EDQR 0.8× reducer (sold separately) reduces the focal length from 462mm to approximately 370mm and the f\/ratio from f\/7 to f\/5.6—roughly 36% faster. That's a meaningful gain for narrowband or emission nebula imaging where photon-gathering speed matters. The flat-field correction holds with the reducer attached.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this a visual scope or an imaging scope?\u003c\/strong\u003e\u003cbr\u003eIt's designed for imaging. The quadruplet flat-field correction, threaded drawtube, built-in rotator, and autofocuser compatibility are all imaging-oriented features. That said, the views through a quality 2\" wide-field eyepiece are excellent—sharp, color-free, and high contrast. It performs genuinely well for visual work, especially wide-field sweeping and star clusters. It just happens to excel at imaging.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat mounts work with it?\u003c\/strong\u003e\u003cbr\u003eAt 3.6kg with rings and handle, it fits comfortably on light-to-medium equatorial platforms. Harmonic drives—ZWO AM5, iOptron HEM27, Rainbow Astro RST-135—are ideal. The Sky-Watcher Star Adventurer GTi handles it without strain. Heavier mounts (HEQ5, EQ6-R) have no trouble either. It works with standard Vixen-style and Losmandy-style dovetail saddles via the included tube rings.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable style=\"width:100%; border-collapse: collapse;\"\u003e\u003ctbody\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eAperture\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e66mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eFocal Length\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e462mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eOptical Design\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eQuadruplet apochromatic refractor, air-spaced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eED Glass\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e2 elements (FK-61 + proprietary)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eImage Circle\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e43.2mm (full-frame)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eFocuser\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e2.8\" dual-speed rack-and-pinion, 10:1 fine focus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eFocuser Threading\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eM63, M54, M48 male; 2\" compression ring adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eFocuser Rotation\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e360° built-in angle adjuster\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eOTA Length (retracted)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e343mm (13.5\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eOTA Length (extended)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e420mm (16.5\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eWeight (with rings \u0026amp; handle)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e3.6kg (7.9 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":54541818855497,"sku":"AT66EDQ","price":849.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/66A.png?v=1750683292"}],"url":"https:\/\/astronomics.com\/collections\/astrographs.oembed?page=3","provider":"Astronomics","version":"1.0","type":"link"}