{"title":"OTA","description":"\u003cp\u003eThe optical tube is really the heart of your night time exploration.  Sizes range from 50mm to 20\" in diameter as well as f\/ratios from f\/2.2 to f\/15.  The optical designs range from simple doublet refractors to complex cassegrains with built-in field flatteners.  There is literally something for everyone here, you just have to decide what path you want to walk down.  We are always here to help with any questions you have.\u003c\/p\u003e","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":"toa-130s-5-1-f-7-7-ortho-apochromat-triplet-refractor-ota","title":"Takahashi TOA-130NS 5.1\" f\/7.7 Ortho-Apochromat Triplet Refractor OTA","description":"\u003cp\u003eThis performance of this Takahashi 5.1\" ED triplet refractor is too good to let it be called simply an apochromatic scope. Only the term ortho-apochromatic is accurate enough to describe its optical excellence.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Takahashi TOA-130 refractor optical tube has: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e • 130mm f\/7.7 Ortho-Apochromat triplet optics with dual ED elements \u003cbr\u003e• 2.7\" rack and pinion focuser with 1.25\" eyepiece adapter \u003cbr\u003e• retractable dew shield \u003cbr\u003e• 250mm of back focus for CCD and film imaging \u003cbr\u003e• state-of-the-art optical performance, exceeding even fluorite scopes\u003cbr\u003e• 5-year warranty \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e    The Takahashi TOA-130 refractor provides exceptionally high optical and mechanical quality for the serious observer who needs optics of reasonable portability. The TOA-130 is exceptional for observing and imaging within the solar system. Its images of subtle lunar and planetary details are sharp, with realistic and highly saturated color. They are free from chromatic aberration's violet haze of spurious color, thanks to the scope's ED triplet optics. The latest antireflection multicoatings and numerous knife-edge internal baffles assure the maximum image contrast possible. \u003c\/p\u003e\n\u003cp\u003eThis 5.1\" Takahashi has a large aperture and diffraction-free images that make it surprisingly good for much deep space observing, as well. Binary stars and globular star clusters are particularly well-resolved and vivid, with the contrasting colors of many binary systems showing nicely. The brighter nebulas and galaxies stand out against a very dark sky background. \u003c\/p\u003e\n\u003cp\u003eThe TOA-130's f\/7.7 focal ratio and 1000mm focal length is long enough, using a Takahashi 2.8mm ED eyepiece to provide 357x, for high magnification observations of the Moon and planets, yet it will also produce a huge 2.5° field at 20x, using a 2\" Takahashi 50mm eyepiece.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Telescope's Optical and Mechanical Systems . . . \u003c\/strong\u003e\u003c\/p\u003e\n\u003cblockquote\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eApochromatic triplet ED refractor optics:\u003c\/strong\u003e 130mm (5.1\") aperture, 1000mm focal length, f\/7.7 Ortho-Apochromatic triplet lens using two FPL-53 ED (Extra-low Dispersion) glass elements flanking a crown glass element for pinpoint stars and images that are free from spurious color (chromatic aberration).\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulticoated optics: \u003c\/strong\u003eFully coated on all surfaces with multiple layers of antireflection materials for high light transmission and good contrast.\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable dew shield: \u003c\/strong\u003eSlows the formation of dew on the lens to extend your undisturbed observing time. Also improves visual and photographic contrast by shielding the lens from off-axis ambient light (the neighbor's yard light, moonlight, etc.) For transport, the retractable lens shade keeps the overall length of the optical tube to a manageable 32\" when it is retracted and the visual extension tube removed.\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRack and pinion focuser: \u003c\/strong\u003e2.7\" focuser, with a 2\" eyepiece\/accessory holder that threads into the 2.7\" focuser drawtube. A 1.25\" compression ring eyepiece\/star diagonal holder is also supplied. The non-marring soft nylon compression ring of the 1.25\" eyepiece holder won't scratch the barrels of your accessories or star diagonal, as ordinary thumbscrews can. Dual focusing knobs provide precise image control with either hand. The large focus knobs are easy to operate, even while wearing gloves or mittens in cold weather. \u003cbr\u003eThe 2.7\" focuser yields a 40mm image circle for virtually unvignetted 35mm prime focus photography. For medium format camera use, the TOA-130 is also available in a 4\" focuser version (#TOA-131) that provides a 92mm image circle. A large thumbscrew locks the focuser tube in place without image shift at the correct photographic focus. \u003cbr\u003eA useful photographic accessory would be the Takahashi #CAA102 camera angle adjuster, shown below. This attaches to the 2.7\" focuser drawtube in place of the 2\" eyepiece holder. It allows the photographic accessory train to be rotated to the most appropriate angle to frame the object being photographed (a landscape format, portrait, or any angle in between) without having to loosen the camera adapter and perhaps lose the correct focus. Once the camera is oriented correctly, a large knob on the side of the adjuster can be tightened to hold the camera in place during the exposure.\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinderscope mounting point: \u003c\/strong\u003eNo finderscope is supplied, but a flat boss with two mounting bolt holes is provided on the top of the focuser body for mounting an optional finderscope. The Takahashi 7x50mm 6.2° field finder and bracket shown below are recommended.\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong back focus: \u003c\/strong\u003eBack focus is a very good 250mm, allowing the stacking of a wide variety of CCD cameras, color filter wheels, electric focusers, camera angle adjusters, and film cameras.\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptional photographic accessories: \u003c\/strong\u003eThree accessories are available to provide a variety of image scales and sky coverage: a field flattener, a focal reducer, and an extender. The field flattener reduces the focal ratio slightly (to f\/7.53) and gives pinpoint stars to the very edges of the 40mm (2.3°) image circle for virtually unvignetted 35mm images. The focal reducer effectively cuts the focal length to 750mm and the focal ratio to f\/5.76. The photographic field is now 3.8°, spread over a 50mm image circle for totally non-vignetted 35mm photography. A 1.6x extender (which can also be used visually) effectively increases the focal length to 1600mm and the focal ratio to f\/12.3. The photographic field is 1.4° with this extender in use. A variety of photographic coupling attachments and eyepiece projection photography adapters are also available.\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting rings: \u003c\/strong\u003eNo mounting rings are supplied for the 155mm diameter optical tube. Two options are available. One is the Takahashi tube holder (#130TH) shown below that is designed specifically for mounting the TOA-130 on a Takahashi EM-200 or larger equatorial mount. The second option is a pair of Parallax split mounting rings (#PFS152), also shown below, for mounting on a non-Takahashi mount, such as a Losmandy G-11.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/blockquote\u003e\n\u003cp\u003eThe image above shows the scope with an optional 7 x 50mm finderscope. The feature image below shows the rear cell of the scope as supplied, without the optional finderscope.\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\"\u003e5\"\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\"\u003e1000mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/7.7\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\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e278x\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\"\u003e22 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\"\u003e0.89 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e13.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e5 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":40221634592841,"sku":"TOA130","price":6000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/3696_1.jpg?v=1662966721"},{"product_id":"questar-7-astro-maksutov-cassegrain","title":"Questar 7\" Astro Maksutov-Cassegrain","description":"\u003cp\u003eObserve through a Questar Seven Astro, and you'll see detail and clarity in the skies that you have never seen through a lesser scope, or even through many larger scopes. I have compared my own Questar Seven to a 14\" Schmidt-Cassegrain on deep space objects such as the Sombrero galaxy, the Saturn Nebula, and Omega Centauri. While the 14\" scope was brighter on the fainter objects, the superior contrast and resolution of the Questar Seven was easily visible . . . even to the owner of the 14\" scope. The Crêpe Ring and Encke's Division in the rings of Saturn are routine with a Seven in good seeing, as are myriad whorls and festoons in Jupiter's belts and hundreds of sub-kilometer craters on the lunar surface.\u003c\/p\u003e\n\u003cp\u003eWhat is it about a Questar that lets it outperform larger scopes on a day in\/day out basis?\u003c\/p\u003e\n\u003cp\u003eSimply this: a fanatical devotion to hand-crafted accuracy.\u003c\/p\u003e\n\u003cp\u003eEach optical element in a Questar typically tests out at a truly outstanding 1\/50th wave accuracy (shaped to within four ten-millionths of an inch of perfection!) This produces guaranteed total system performance at the Cassegrain focus of 1\/8th wave or better. That's twice the accuracy needed to meet Lord Rayleigh's Criterion, which specifies the level of optical excellence required to yield visual performance that is indistinguishable from perfect optics.\u003c\/p\u003e\n\u003cp\u003eMost commercial telescopes claim to be \"diffraction-limited\" (which is generally assumed to mean 1\/4th wave accuracy). However, they do not specify whether that is for individual components or the system as a whole. In either case, it's a far cry from the 1\/8th wave \u003cem\u003etotal system accuracy \u003c\/em\u003eat the eyepiece of a Questar.\u003c\/p\u003e\n\u003cp\u003eThis significant difference in total system accuracy is one reason why a 7\" Questar can routinely outresolve a 14\" Schmidt-Cassegrain (or virtually any other larger aperture catadioptric or reflector scope) on globular clusters, binary stars, and lunar and planetary details - with the Questar invariably exceeding Dawes' limit for the best resolution available from an optical system of its aperture.\u003c\/p\u003e\n\u003cp\u003eA second reason is the turbulent Earth atmosphere all telescopes must look through. In essence, when observing, you are usually looking through bubbles of disturbed air - microcells typically 4\" in diameter in the layer of the atmosphere nearest the surface of the Earth. The larger the aperture of the scope, the greater the image-blurring effect of these microcells, as the larger scopes simply have to look through more of these turbulent cells than a smaller scope.\u003c\/p\u003e\n\u003cp\u003eFinally, there is the matter of contrast. The small secondary mirror of a Questar Seven Maksutov (only 1.87\" in diameter) scatters far less light than a 14\" Schmidt-Cassegrain's much larger 4.5\" secondary. The same holds true with any other larger reflector or catadioptric telescope you care to name. They all have larger light-scattering secondary or diagonal mirror obstructions than a 7\" Questar Astro. In addition, a Questar's central baffle tube is not merely black plastic or painted black to reduce reflections, as with lesser scopes, but is a centerless ground stainless steel tube, anodized matte black and containing a wire helix with 19 internal knife-edge baffles to eliminate low-angle reflections that no paint alone can stop. The result is that a Questar scatters less light from the bright areas of an image into the dark - crisply defining high contrast planetary and lunar details that a larger scope can wash out in a haze of scattered light.\u003c\/p\u003e\n\u003cp\u003eA large aperture scope does have greater light-gathering than a 7\" Questar to capture additional faint deep space objects from a dark sky site. However, the higher contrast of a Questar lets the multitude of galaxies and nebulas within its grasp stand out more distinctly against a darker sky background, particularly from light-polluted suburban or city sites where a larger scope's greater light-gathering capacity submerges subtle low-contrast deep space details in a fog of city light.\u003c\/p\u003e\n\u003cp\u003eAs a Rolls-Royce is to automobiles, so is a Questar to telescopes - the very finest hand-crafted optical performance that money can buy.\u003c\/p\u003e\n\u003cp\u003eThe Questar Astro is precision-fabricated of lightened aluminum and titanium components, black and blue anodized for long life. It has a 1\" diameter knurled anodized aluminum focusing knob on the rear cell. The knob focuses the scope by turning a spring-loaded 32-pitch stainless steel focus rod that acts directly on the mirror thimble to move the primary mirror within the optical tube. A precision linear rotor bearing, integrated with the mirror mounting, is matched to central tube thimble to minimize mirror shift when focusing.\u003c\/p\u003e\n\u003cp\u003eThe Seven Astro uses a 7\" diameter meniscus corrector lens of Grade A BK7 optical glass, with magnesium fluoride anti-reflection coatings for high light transmission and minimal reflected light loss. The 7.6\" diameter primary mirror is Pyrex, aluminized, with a silicon monoxide (quartz) overcoating for long life.\u003c\/p\u003e\n\u003cp\u003eThe Questar Astro comes with a 2\" mirror star diagonal (with a 1.25\" eyepiece adapter for Questar Brandon eyepieces) that threads onto the rear cell. A swivel coupling allows the eyepiece\/diagonal combination to be tilted from side to side to the most comfortable observing position. A 1.25\" Questar Brandon eyepiece is supplied with the scope to get you started observing. It provides a magnification of 100x and a 0.53° field of view that's a little larger in diameter than the full Moon. A dust cap and thread-on lens shade are standard, as is a hard carrying case. The Questar Seven Astro optical tube uses the well-known TeleVue Starbeam red dot unity-power illuminated finder that makes pointing a telescope as easy as pointing your finger.\u003c\/p\u003e\n\u003cp\u003eThe Questar Astro weighs 19 pounds (with diagonal and eyepiece in place, 21 pounds if you add the thread-on dew shield). It measures 17.6\" long (21.9\" with the star diagonal in place). The low profile mounting adapter block on the underside of the Astro has both 1\/4\"-20 and 3\/8\"-16 mounting holes to allow to be installed on the Questar Equatorial Fork Mount (our part #20004) and Questar Large Astro Pier (our part #29338) for astronomical use. It is well-balanced and relatively light, allowing it to be mounted on any suitably sturdy tripod for terrestrial operation. It can also be adapted to your own equatorial mount with minimal effort.\u003c\/p\u003e\n\u003cp\u003eA useful upgrade to consider would be to substitute a broadband coatings package on the optics in lieu of the standard magnesium fluoride coatings. This optional dielectric multicoatings package includes ultra-high transmission\/low reflectivity broadband dielectric multicoatings on both sides of its objective lens for a light loss of less than 1\/10th of 1% per surface for the brightest possible images. This compares with a light loss of 1% per surface with standard magnesium fluoride antireflection coatings. This multicoatings package also includes high reflectivity silver mirror coatings with a protective overcoating of thorium fluoride instead of standard aluminum coatings with a silicon monoxide overcoat. The broadband coatings package gives you a full 22% overall gain in light transmission and contrast that's very useful for photography and when viewing faint deep space objects.\u003c\/p\u003e\n\u003cp\u003eThis broadband coatings package is not recommended if you live full time on ocean-front property, or spend much of the year at the seaside. Constant exposure to salt air can adversely affect the silver mirror coatings. Occasional visits to the shore are not a problem, only extended stays (particularly if the scope is not packed away in its case when not in use). Adding a few packets of desiccant (silica gel or similar, available at most camera stores) to the case to absorb moisture when near large bodies of salt water would be a helpful preventative measure in any event.\u003c\/p\u003e\n\u003cp\u003eA thermally stable Zerodur ceramic mirror is also available as an option in place of the standard Pyrex mirror. As with any Pyrex mirror telescope, if the difference in temperature between indoors and outdoors is 30 degrees or more when a Questar is taken outside, minor refocusing will be required as its mirror contracts while cooling down to the outdoor air temperature. Some people find the need for even an occasional refocusing to be annoying. Since a Zerodur mirror exhibits virtually no expansion or contraction as temperatures change, this option eliminates this need for refocusing. This option is well worth considering due to the large thermal mass of the 7\" mirror and its consequently longer cool-down time than a smaller scope. I have both broadband coatings and a Zerodur mirror on my Questar Seven and can recommend them without reservation.\u003c\/p\u003e\n\u003cp\u003eThe Questar Seven Astro comes in a high impact ABS plastic sealed carrying case. A basic 35mm camera coupling set is also included (needs a Questar T-ring to connect to your camera).\u003c\/p\u003e\n\u003cp\u003eThis Questar is protected by a ten-year Questar warranty (two-year warranty on the focuser mechanism).\u003c\/p\u003e\n\u003cp\u003eAbsolutely pinpoint resolution, total freedom from spurious color and distortion, with an image clarity and contrast in a class all its own - a Questar is truly the Rolls-Royce of telescopes. For those individuals who appreciate the very finest that life has to offer, a Questar Seven Astro will prove to be an absolutely eye-opening revelation.\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\"\u003e7\"\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\"\u003e2400mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/13.4\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\"\u003e17 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e362x\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\"\u003e19 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePlanetary Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.65 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e13.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e10 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Questar","offers":[{"title":"Default Title","offer_id":40221638131785,"sku":"Q7A","price":11895.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/3985_1.jpg?v=1662966844"},{"product_id":"fs-60cb-2-4-f-5-9-fluorite-doublet-apo","title":"Takahashi FS-60CB 2.4\" f\/5.9 Fluorite Doublet APO Refractor","description":"\u003cp\u003eThis compact Takahashi refractor optical tube makes an ideal eclipse scope and a super travel and backyard scope for spur-of-the-moment observing. It uses a 60mm f\/5.9 fast focal ratio air-spaced doublet optical system. The front element is a laboratory-grown calcium fluorite crystal lens with hard multicoatings for maximum light transmission. The rear element is hard multicoated low dispersion flint glass. The combination of fluorite crystal and low dispersion glass provide absolutely superb apochromatic color correction that is visibly better than any ED glass doublet scope. Color correction is on a par with far more costly triplet systems, but the light transmission is higher than any triplet apochromatic system, due to the smaller number of optical elements to scatter and absorb light. This Takahashi optical tube uses a series of internal knife-edge baffles to block stray off-axis light for the highest possible image contrast. \u003c\/p\u003e\n\u003cp\u003eExperienced observers sometimes report that the scope's high contrast\/diffraction-limited optics can be used at magnifications of over 100x per inch of aperture on suitably bright objects (the Moon and planets) on nights of exceptional seeing. Of course, we can't guarantee you'll be able to reach this kind of magnification level with any sort of regularity with this Takahashi (it would take the equivalent of a 1.5mm eyepiece and would produce a very dim 0.25mm exit pupil), but the possibility of very high magnification is there.\u003c\/p\u003e\n\u003cp\u003eThe smooth Takahashi rack and pinion focuser has large ribbed focusing knobs that are easy to grip and operate in cold weather, even when wearing gloves. The optical tube has a flat boss above the focusing knobs, with two mounting bolts to hold an optional finderscope, such as the straight-through Takahashi 5 x 25mm with its very wide 9° field. The supplied 1.25\" eyepiece holder uses a non-marring nylon split compression ring system to hold your star diagonal or eyepiece in place. This system won't scratch the barrel of your eyepiece or star diagonal, as an ordinary brass or steel thumbscrew can. A simple twist of the ribbed ring at the end of the focuser drawtube tightens the internal compression ring to hold your diagonal firmly in place; while a twist in the opposite direction lets you remove it with ease.\u003c\/p\u003e\n\u003cp\u003eThe Takahashi optical tube itself weighs less than three lbs. It measures only 17\" long with dew shield in place. The optical tube is 80mm in diameter and an optional tube holder is available to fit the scope on a Takahashi mount (such as the altazimuth #TGS01 or the very compact #TGUL Teegul Sky Patrol equatorial).\u003c\/p\u003e\n\u003cp\u003eThe 60mm Takahashi FS-60C. Expensive for a 60mm optical tube? Yes. Worth it? Emphatically yes.\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\"\u003e2.4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e355mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/5.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2.9 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e118x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2.9 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1.95 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e10.7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e5 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":40221639999561,"sku":"FS60","price":810.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/4192_1.jpg?v=1662966898"},{"product_id":"questar-7-classic-titanium-maksutov-cassegrain-broadband-coatings","title":"Questar 7\" Classic Titanium Maksutov-Cassegrain, Broadband Coatings","description":"\u003cp\u003eThere are mere mortal telescopes and then there is the Questar Seven Classic Titanium with broadband coatings, which inhabits a higher plane of astronomical excellence than an ordinary telescope . . .\u003c\/p\u003e\n\u003cp\u003eObserve through a Questar Seven Classic Titanium optical tube with broadband optical coatings, and you'll see detail and clarity in the skies that you have never seen through a lesser scope, or even through many larger scopes. I have compared my own Questar Seven to a 14\" Schmidt-Cassegrain on deep space objects such as the Sombrero galaxy, the Saturn Nebula, and Omega Centauri. While the 14\" scope was brighter on the fainter objects, the superior contrast and resolution of the Questar Seven was easily visible . . . even to the owner of the 14\" scope. The Crêpe Ring and Encke's Division in the rings of Saturn are routine with a Seven Classic in good seeing, as are myriad whorls and festoons in Jupiter's belts and hundreds of sub-kilometer craters on the lunar surface.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWhat is it about a Questar that lets it outperform larger scopes on a day in\/day out basis?\u003c\/p\u003e\n\u003cp\u003eSimply this: a fanatical devotion to hand-crafted accuracy.\u003c\/p\u003e\n\u003cp\u003eEach optical element in a Questar typically tests out at a truly outstanding 1\/50th wave accuracy (shaped to within four ten-millionths of an inch of perfection!) This produces guaranteed total system performance at the Cassegrain focus of 1\/8th wave or better. That's twice the accuracy needed to meet Lord Rayleigh's Criterion, which specifies the level of optical excellence required to yield visual performance that is indistinguishable from perfect optics.\u003c\/p\u003e\n\u003cp\u003eMost commercial telescopes claim to be \"diffraction-limited\" (which is generally assumed to mean 1\/4th wave accuracy). However, they do not specify whether that is for individual components or the system as a whole. In either case, it's a far cry from the 1\/8th wave \u003cem\u003etotal system accuracy \u003c\/em\u003eentering the eyepiece of a Questar.\u003c\/p\u003e\n\u003cp\u003eThis significant difference in total system accuracy is one reason why a 7\" Questar can routinely outresolve a 14\" Schmidt-Cassegrain (or virtually any other larger aperture catadioptric or reflector scope) on globular clusters, binary stars, and lunar and planetary details - with the Questar invariably exceeding Dawes' limit for the best resolution available from an optical system of its aperture.\u003c\/p\u003e\n\u003cp\u003eA second reason is the turbulent Earth atmosphere all telescopes must look through. In essence, when observing, you are usually looking through bubbles of disturbed air - microcells typically 4\" in diameter in the layer of the atmosphere nearest the surface of the Earth. The larger the aperture of the scope, the greater the image-blurring effect of these microcells, as the larger scopes simply have to look through more of these turbulent cells than a smaller scope.\u003c\/p\u003e\n\u003cp\u003eFinally, there is the matter of contrast. The small secondary mirror of a Questar Seven Maksutov (only 1.87\" in diameter) scatters far less light than a 14\" Schmidt-Cassegrain's much larger 4.5\" secondary. The same holds true with any other larger reflector or catadioptric telescope you care to name. They all have larger light-scattering secondary or diagonal mirror obstructions than a 7\" Questar Classic Titanium. In addition, a Questar's central baffle tube is not merely black plastic or painted black to reduce reflections, as with lesser scopes, but is a centerless ground stainless steel tube, anodized matte black and containing a wire helix with 19 internal knife-edge baffles to eliminate low-angle reflections that no paint alone can stop. The result is that a Questar scatters less light from the bright areas of an image into the dark - crisply defining high contrast planetary and lunar details that a larger scope can wash out in a haze of scattered light.\u003c\/p\u003e\n\u003cp\u003eA large aperture scope does have greater light-gathering than a 7\" Questar to capture additional faint deep space objects from a dark sky site. However, the higher contrast of a Questar lets the multitude of galaxies and nebulas within its grasp stand out more distinctly against a darker sky background, particularly from light-polluted suburban or city sites where a larger scope's greater light-gathering capacity submerges subtle low-contrast deep space details in a fog of city light.\u003c\/p\u003e\n\u003cp\u003eAs a Rolls-Royce is to automobiles, so is a Questar to telescopes - the very finest hand-crafted optical performance that money can buy.\u003c\/p\u003e\n\u003cp\u003eThe Questar Classic Titanium is precision-fabricated of specially lightened aluminum and titanium, with a black and blue anodized finish for long life. Questar engaged in an extensive heat transfer analysis to refine the shaping and milling of the internal components to dissipate heat and rapidly bring the optics down to ambient temperature quickly. This was done to avoid having to resort to the use of powered fans to cool the optics as others do (which can suck image-degrading dust into the optical path).\u003c\/p\u003e\n\u003cp\u003eAll internal components (such as the main tube mounting plate, mirror thimble, and central light baffle tube) are titanium, with milled surfaces to increase heat transfer and lighten weight. The optical tube is extruded and stress-relieved aluminum. The control box is machined cast aluminum, with milled internal surfaces to increase heat transfer and lighten weight. It is externally painted with special aluminum paint and clear overcoated for durability. The interior is finished in anti-reflective matte black paint.\u003c\/p\u003e\n\u003cp\u003eThe control knobs on the rear cell are turret lathe-turned anodized aluminum, with sharts and control levers of stainless steel. The focus knob focuses the scope by turning a spring-loaded 1\/4\"-32 thread stainless steel focus rod that acts directly on the titanium mirror thimble to move the primary mirror along the titanium central baffle tube within the optical tube. A precision linear ball-type bearing, integrated with the mirror mounting, is matched to central tube thimble to minimize mirror shift when focusing.\u003c\/p\u003e\n\u003cp\u003eThe optical tube barrel of the Questar Seven Classic Titanium is wrapped with an accurate full-color silk-screened star chart. The thread-on dewcap is wrapped with a useful silk-screened map of the Moon.\u003c\/p\u003e\n\u003cp\u003eThe Seven Classic Titanium uses a 7\" diameter meniscus corrector lens of Grade A BK7 optical glass, with magnesium fluoride anti-reflection coatings for high light transmission and minimal reflected light loss. The 7.6\" diameter primary mirror is Pyrex, aluminized, with a silicon monoxide (quartz) overcoating for long life.\u003c\/p\u003e\n\u003cp\u003eInsert the Questar's premium 24mm 1.25\" Questar Brandon eyepiece into the eyepiece holder on the top of the control box at the rear of the scope. Look in and you're looking into a 7.6x finder with a wide 7° field. A finger touch on a convenient lever at the rear of the scope changes the finder into a 106x telescope for observing the Moon, nebulas, galaxies, and star clusters. Touch a second lever and a built-in 2x Dakin Barlow instantly increases that eyepiece power to 212x for closer observing. Exchange the 24mm eyepiece for the supplied 16mm 1.25\" Questar Brandon eyepiece and you extend the power range still further, to an 11.5x finder with a 4.6° field and a 159x and 318x telescope. You never have to worry about the telescope and finderscope getting out of alignment with each other, because the finderscope in an integral part of the telescope body itself. Optional higher and lower power 1.25\" Questar Brandon eyepieces are available, for magnifications as low as 63.5x and as high as 635x.\u003c\/p\u003e\n\u003cp\u003eIn addition, the Questar Classic Titanium can be equipped with an optional 2\" mirror star diagonal that threads onto the rear cell. This lets you use longer focal length 2\" Brandon and third party eyepieces to lower the magnification to as little as 45x.\u003c\/p\u003e\n\u003cp\u003eThe Questar Classic Titanium weighs 19 pounds, 21 pounds if you add the thread-on dew shield). It measures 22.6\" long. The low profile mounting adapter block on the underside of the Classic Titanium has both 1\/4\"-20 and 3\/8\"-16 mounting holes to allow to be installed on the Questar Equatorial Fork Mount (our part #20004) and Questar Large Classic Titanium Pier (our part #29338) for astronomical use. It is well-balanced and relatively light, allowing it to be mounted on any suitably sturdy tripod for terrestrial operation. It can also be adapted to your own equatorial mount with minimal effort.\u003c\/p\u003e\n\u003cp\u003eThis Questar Seven Classic Titanium has a broadband dielectric multicoatings package that includes ultra-high transmission\/low reflectivity broadband dielectric multicoatings on both sides of its objective lens for a light loss of less than 1\/10th of 1% per surface for the brightest possible images. This compares with a light loss of 1% per surface with standard magnesium fluoride antireflection coatings. This multicoatings package also includes high reflectivity silver mirror coatings with a protective overcoating of thorium fluoride instead of standard aluminum coatings with a silicon monoxide overcoat. The broadband coatings package gives you a full 22% overall gain in light transmission and contrast that's very useful for photography and when viewing faint deep space objects.\u003c\/p\u003e\n\u003cp\u003eThis broadband coatings package is not recommended if you live full time on ocean-front property, or spend much of the year at the seaside. Constant exposure to salt air can adversely affect the silver mirror coatings. Occasional visits to the shore are not a problem, only extended stays (particularly if the scope is not packed away in its case when not in use). Adding a few packets of desiccant (silica gel or similar, available at most camera stores) to the case to absorb moisture when near large bodies of salt water would be a helpful preventative measure in any event.\u003c\/p\u003e\n\u003cp\u003eA thermally stable Zerodur ceramic mirror is also available as an option in place of the standard Pyrex mirror. As with any Pyrex mirror telescope, if the difference in temperature between indoors and outdoors is 30 degrees or more when a Questar is taken outside, minor refocusing will be required as its mirror contracts while cooling down to the outdoor air temperature. Some people find the need for even an occasional refocusing to be annoying. Since a Zerodur mirror exhibits virtually no expansion or contraction as temperatures change, this option eliminates this need for refocusing. This option is well worth considering due to the large thermal mass of the 7\" mirror and its consequently longer cool-down time than a smaller scope. I have both broadband coatings and a Zerodur mirror on my Questar Seven and can recommend them without reservation.\u003c\/p\u003e\n\u003cp\u003eThe Questar Seven Classic Titanium comes in a high impact ABS plastic sealed carrying case with wheels and transport handle. A basic 35mm camera coupling set is also included (needs a Questar T-ring to connect to your camera).\u003c\/p\u003e\n\u003cp\u003eThis Questar is protected by a ten-year Questar warranty (two-year warranty on the focuser mechanism and five years on the broadband coatings).\u003c\/p\u003e\n\u003cp\u003eAbsolutely pinpoint resolution, total freedom from spurious color and distortion, with an image clarity and contrast in a class all its own - a Questar is truly the Rolls-Royce of telescopes. For those individuals who appreciate the very finest that life has to offer, a Questar Seven Classic Titanium with broadband optical coatings will prove to be an absolutely eye-opening astronomical revelation.\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\"\u003e7\"\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\"\u003e2425mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/13.6\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\"\u003e19 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e423x\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\"\u003e19 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePlanetary Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.65 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e13.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e10 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Questar","offers":[{"title":"Default Title","offer_id":40221647077449,"sku":"Q7CBT","price":12795.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/5514_1.jpg?v=1662967132"},{"product_id":"questar-7-classic-titanium-maksutov-cassegrain-broadband-coatings-quartz-mirror","title":"Questar 7\" Classic Titanium Maksutov-Cassegrain, Magnesium Fluoride AR and Silver Reflecting Coatings, Quartz Mirror","description":"\u003cp\u003eThis Questar Seven Classic Titanium uses the same quartz mirror and coatings combination as the renowned 50th Anniversary 3.5\" Questar, perhaps the ultimate small telescope. Is this Questar the ultimate mid-sized telescope? . . .\u003c\/p\u003e\n\u003cp\u003eLook through a Questar Seven Classic Titanium optical tube with a zero thermal expansion quartz mirror, and you're looking through an absolutely superb example of the telescope maker's art. You'll see detail and clarity in the skies that you have never seen through any lesser scope, or even through many larger scopes. I have compared my own Questar Seven to a 14\" Schmidt-Cassegrain on deep space objects such as the Sombrero galaxy, the Saturn Nebula, and Omega Centauri. While the 14\" scope was brighter on the fainter objects, the superior contrast and resolution of the Questar Seven was easily visible . . . even to the owner of the 14\" scope. The Crêpe Ring and Encke's Division in the rings of Saturn are routine with a Seven Classic in good seeing, as are myriad whorls and festoons in Jupiter's belts and hundreds of sub-kilometer craters on the lunar surface.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWhat is it about a Questar that lets it outperform larger scopes on a day in\/day out basis?\u003c\/p\u003e\n\u003cp\u003eSimply this: a fanatical devotion to hand-crafted accuracy.\u003c\/p\u003e\n\u003cp\u003eEach optical element in a Questar typically tests out at a truly outstanding 1\/50th wave accuracy (shaped to within four ten-millionths of an inch of perfection!) This produces guaranteed total system performance at the Cassegrain focus of 1\/8th wave or better. That's twice the accuracy needed to meet Lord Rayleigh's Criterion, which specifies the level of optical excellence required to yield visual performance that is indistinguishable from perfect optics.\u003c\/p\u003e\n\u003cp\u003eMost commercial telescopes claim to be \"diffraction-limited\" (which is generally assumed to mean 1\/4th wave accuracy). However, they do not specify whether that is for individual components or the system as a whole. In either case, it's a far cry from the 1\/8th wave \u003cem\u003etotal system accuracy \u003c\/em\u003eentering the eyepiece of a Questar.\u003c\/p\u003e\n\u003cp\u003eThis significant difference in total system accuracy is one reason why a 7\" Questar can routinely outresolve a 14\" Schmidt-Cassegrain (or virtually any other larger aperture catadioptric or reflector scope) on globular clusters, binary stars, and lunar and planetary details - with the Questar invariably exceeding Dawes' limit for the best resolution available from an optical system of its aperture.\u003c\/p\u003e\n\u003cp\u003eA second reason is the turbulent Earth atmosphere all telescopes must look through. In essence, when observing, you are usually looking through bubbles of disturbed air - microcells typically 4\" in diameter in the layer of the atmosphere nearest the surface of the Earth. The larger the aperture of the scope, the greater the image-blurring effect of these microcells, as the larger scopes simply have to look through more of these turbulent cells than a smaller scope.\u003c\/p\u003e\n\u003cp\u003eFinally, there is the matter of contrast. The small secondary mirror of a Questar Seven Maksutov (only 1.87\" in diameter) scatters far less light than a 14\" Schmidt-Cassegrain's much larger 4.5\" secondary. The same holds true with any other larger reflector or catadioptric telescope you care to name. They all have larger light-scattering secondary or diagonal mirror obstructions than a 7\" Questar Classic Titanium. In addition, a Questar's central baffle tube is not merely black plastic or painted black to reduce reflections, as with lesser scopes, but is a centerless ground stainless steel tube, anodized matte black and containing a wire helix with 19 internal knife-edge baffles to eliminate low-angle reflections that no paint alone can stop. The result is that a Questar scatters less light from the bright areas of an image into the dark - crisply defining high contrast planetary and lunar details that a larger scope can wash out in a haze of scattered light.\u003c\/p\u003e\n\u003cp\u003eA large aperture scope does have greater light-gathering than a 7\" Questar to capture additional faint deep space objects from a dark sky site. However, the higher contrast of a Questar lets the multitude of galaxies and nebulas within its grasp stand out more distinctly against a darker sky background, particularly from light-polluted suburban or city sites where a larger scope's greater light-gathering capacity submerges subtle low-contrast deep space details in a fog of city light.\u003c\/p\u003e\n\u003cp\u003eAs a Rolls-Royce is to automobiles, so is a Questar to telescopes - the very finest hand-crafted optical performance that money can buy.\u003c\/p\u003e\n\u003cp\u003eThe Questar Classic Titanium is precision-fabricated of specially lightened aluminum and titanium, with a black and blue anodized finish for long life. Questar engaged in an extensive heat transfer analysis to refine the shaping and milling of the internal components to dissipate heat and rapidly bring the optics down to ambient temperature quickly. This was done to avoid having to resort to the use of powered fans to cool the optics as others do (which can suck image-degrading dust into the optical path).\u003c\/p\u003e\n\u003cp\u003eAll internal components (such as the main tube mounting plate, mirror thimble, and central light baffle tube) are titanium, with milled surfaces to increase heat transfer and lighten weight. The optical tube is extruded and stress-relieved aluminum. The control box is machined cast aluminum, with milled internal surfaces to increase heat transfer and lighten weight. It is externally painted with special aluminum paint and clear overcoated for durability. The interior is finished in anti-reflective matte black paint.\u003c\/p\u003e\n\u003cp\u003eThe control knobs on the rear cell are turret lathe-turned anodized aluminum, with sharts and control levers of stainless steel. The focus knob focuses the scope by turning a spring-loaded 1\/4\"-32 thread stainless steel focus rod that acts directly on the titanium mirror thimble to move the primary mirror along the titanium central baffle tube within the optical tube. A precision linear ball-type bearing, integrated with the mirror mounting, is matched to central tube thimble to minimize mirror shift when focusing.\u003c\/p\u003e\n\u003cp\u003eThe optical tube barrel of the Questar Seven Classic Titanium is wrapped with an accurate full-color silk-screened star chart. The thread-on dewcap is wrapped with a useful silk-screened map of the Moon.\u003c\/p\u003e\n\u003cp\u003eInsert the Questar's premium 24mm 1.25\" Questar Brandon eyepiece into the eyepiece holder on the top of the control box at the rear of the scope. Look in and you're looking into a 7.6x finder with a wide 7° field. A finger touch on a convenient lever at the rear of the scope changes the finder into a 106x telescope for observing the Moon, nebulas, galaxies, and star clusters. Touch a second lever and a built-in 2x Dakin Barlow instantly increases that eyepiece power to 212x for closer observing. Exchange the 24mm eyepiece for the supplied 16mm 1.25\" Questar Brandon eyepiece and you extend the power range still further, to an 11.5x finder with a 4.6° field and a 159x and 318x telescope. You never have to worry about the telescope and finderscope getting out of alignment with each other, because the finderscope in an integral part of the telescope body itself. Optional higher and lower power 1.25\" Questar Brandon eyepieces are available, for magnifications as low as 63.5x and as high as 635x.\u003c\/p\u003e\n\u003cp\u003eIn addition, the Questar Classic Titanium can be equipped with an optional 2\" mirror star diagonal that threads onto the rear cell. This lets you use longer focal length 2\" Brandon and third party eyepieces to lower the magnification to as little as 45x.\u003c\/p\u003e\n\u003cp\u003eThe Questar Classic Titanium weighs 19 pounds, 21 pounds if you add the thread-on dew shield). It measures 22.6\" long. The low profile mounting adapter block on the underside of the Classic Titanium has both 1\/4\"-20 and 3\/8\"-16 mounting holes to allow to be installed on the Questar Equatorial Fork Mount (our part #20004) and Questar Large Classic Titanium Pier (our part #29338) for astronomical use. It is well-balanced and relatively light, allowing it to be mounted on any suitably sturdy tripod for terrestrial operation. It can also be adapted to your own equatorial mount with minimal effort.\u003c\/p\u003e\n\u003cp\u003eThis Questar Seven Classic Titanium uses the same optical materials and coatings combination as the renowned 50th Anniversary 3.5\" Questar, perhaps the ultimate small telescope. The Seven Classic's zero thermal expansion quartz mirror eliminates the need to refocus the scope as it cools to ambient temperature in situations involving large temperature swings. With a conventional Pyrex mirror telescope, if the difference in temperature between indoors and outdoors is 30 degrees or more Fahrenheit when the scope is taken outside, minor refocusing will be required as its mirror contracts while cooling down to the outdoor air temperature. This is particularly true with a relatively large aperture scope like this Seven Classic, which has an oversize 7.6\" primary mirror. Some people find the need for even an occasional refocusing to be annoying. Since a quartz mirror exhibits no expansion or contraction as temperatures change, the quartz mirror in this Questar Seven Classic Titanium eliminates any need for even minor refocusing. You can take it out into the coldest night or hottest day and use it instantly, without any need for it to acclimate to the ambient temperature.\u003c\/p\u003e\n\u003cp\u003eThis Questar Seven Classic Titanium uses high reflectivity silver mirror coatings with a protective overcoating of thorium fluoride instead of a standard Questar's aluminum coatings with a silicon monoxide overcoat. The two silver mirrors provide a 10% light gain per surface, compared with aluminized mirrors. Magnesium fluoride antireflection coatings are used on the Grade A BK7 optical glass meniscus corrector lens on this scope, as mag fluoride coatings are optimally matched to the reflectivity response of the quartz\/silver\/thorium-coated mirrors.\u003c\/p\u003e\n\u003cp\u003eThis broadband coatings package is not recommended if you live full time on ocean-front property, or spend much of the year at the seaside. Constant exposure to salt air can adversely affect the silver mirror coatings. Occasional visits to the shore are not a problem, only extended stays (particularly if the scope is not packed away in its case when not in use). Adding a few packets of desiccant (silica gel or similar, available at most camera stores) to the case to absorb moisture when near large bodies of salt water would be a helpful preventative measure in any event.\u003c\/p\u003e\n\u003cp\u003eThe Questar Seven Classic Titanium comes in a high impact ABS plastic sealed carrying case with wheels and transport handle. A basic 35mm camera coupling set is also included (needs a Questar T-ring to connect to your camera).\u003c\/p\u003e\n\u003cp\u003eThis Questar is protected by a ten-year Questar warranty (two-year warranty on the focuser mechanism and five years on the broadband coatings).\u003c\/p\u003e\n\u003cp\u003eAbsolutely pinpoint resolution, total freedom from spurious color and distortion, with an image clarity and contrast in a class all its own - a Questar is truly the Rolls-Royce of telescopes. For those individuals who appreciate the very finest that life has to offer, a Questar Seven Classic Titanium with broadband optical coatings and a quartz mirror will prove to be an absolutely eye-opening astronomical revelation. It is a telescope you can live with comfortably for the rest of your life.\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\"\u003e7\"\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\"\u003e2425mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/13.6\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\"\u003e19 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e423x\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\"\u003e19 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePlanetary Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.65 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e13.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e10 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Questar","offers":[{"title":"Default Title","offer_id":40221647175753,"sku":"Q7CQT","price":14695.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/5516_1.jpg?v=1662967137"},{"product_id":"6-f-8-achromatic-doublet-refractor-optical-tube-cg5-avx-dovetail","title":"Celestron 6\" f\/8 Achromatic Doublet Refractor Optical Tube, CG5\/AVX Dovetail","description":"\u003cp\u003eHere's a sensational value - a big 6\" (150mm) achromatic refractor optical tube that's priced like other manufacturers' 80mm scopes. \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Celestron optical tube has: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ebig 6\" aperture fully multicoated achromatic refractor optics\u003c\/li\u003e\n\u003cli\u003ecollimatable objective lens cell for fine-tuning the images\u003c\/li\u003e\n\u003cli\u003ebig 9 x 50mm finderscope\u003c\/li\u003e\n\u003cli\u003e20mm Plössl eyepiece (60x)\u003c\/li\u003e\n\u003cli\u003ebright high contrast deep space views, plus excellent performance inside the solar system\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis 6\" achromatic refractor optical tube is a sensational value! It's the same optical tube that's used on Celestron's best selling Advanced Series go-to refractor. It has a 150mm (6\") diameter multicoated doublet objective lens (1200mm focal length f\/8). That's the equivalent of a 7\" reflector in terms of the amount of light that reaches your eyepiece. With 459 times the light-gathering capacity of the human eye, the optics are sharp and well suited to serious deep space observing of binary stars, star clusters, and the brighter nebulas and galaxies, in addition to excellent high contrast planetary and lunar images. The objective lens cell is fully collimatable, using push\/pull collimation screws, so you can optimize your image quality.\u003c\/p\u003e\n\u003cp\u003eSome chromatic aberration is visible on stars and objects of 2nd or 3rd magnitude and brighter, as you would expect in an achromatic refractor of such large aperture and fast focal ratio. However, the spurious color is well controlled and not unreasonable, thanks to careful optical design, and has little effect on deep space observing. Most observers feel the relatively limited amount of chromatic aberration visible is a small price to pay for the scope's many other virtues of sharpness, contrast, and optical clarity.\u003c\/p\u003e\n\u003cp\u003eFor peak performance, some observers have found that upgrading the supplied star diagonal to a premium version, such as the Astronomy Technologies #AT1D dielectric diagonal, pays visible dividends in sharpness and contrast during high magnification observing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDetails About This Optical Tube . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAchromatic refractor optics:\u003c\/strong\u003e 6\" (150mm) aperture, 1200mm focal length, f\/8 air-spaced crown and flint glass doublet lens. The objective lens cell is fully collimatable for peak optical performance, via a series of push\/pull collimating screws.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMulticoated optics:\u003c\/strong\u003e Fully coated on all surfaces with multiple layers of antireflection materials for high light transmission and good contrast.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDew shield:\u003c\/strong\u003e Slows the formation of dew on the lens in cold weather to extend your undisturbed observing time. Also improves visual and photographic contrast by shielding the lens from off-axis ambient light (the neighbor's yard light, moonlight, etc.)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDust cover:\u003c\/strong\u003e The 6\" dust cover of the objective lens has a removable 4\" diameter cap in the center. During lunar and planetary observing, it is often beneficial to leave the 6\" dust cover in place, but with the 4\" center cap removed. This effectively reduces the aperture to 4\" and converts the telescope to an f\/12 focal ratio. At this longer focal ratio, chromatic aberration is reduced, with only a modest loss in resolution. The same optical trick can be used to improve lunar and planetary image quality during nights of sub-par seeing by reducing the amount of unsteady air the scope has to look through.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRack and pinion focuser:\u003c\/strong\u003e 2\" focuser, with 1.25\" eyepiece adapter. The 1.25\" adapter has external T-threads that let you connect a 35mm camera to the scope for prime focus photography using an optional T-ring with no other camera adapter required. Dual focusing knobs with rubber gripping surfaces for precise image control with either hand. The large focus knobs are easy to operate, even while wearing gloves or mittens in cold weather.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStar diagonal:\u003c\/strong\u003e 90° viewing angle prism-type 1.25\" star diagonal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEyepiece:\u003c\/strong\u003e Fully multicoated low power 1.25\" 20mm (60x) Plössl eyepiece with a 0.83° field of view (over one and a half times the diameter of the full Moon).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFinderscope:\u003c\/strong\u003e 9 x 50mm straight-through achromatic design, with a wide 5.8° field of view. Spring-loaded bracket for fast no-tool alignment with the main scope optical tube. Focuses by loosening the trim ring behind the objective lens cell, screwing the lens cell in or out to focus, and tightening the trim ring to lock in the correct focus.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDovetail tube mount:\u003c\/strong\u003e The optical tube comes with two split and hinged tube rings for installing the optical tube on your mount. The rings are connected to a dovetail mounting plate that slips into the standard dovetail groove on a Celestron Advanced VX Series go-to mount's equatorial head or any mount that has a Vixen Style Saddle Plate. \u003c\/p\u003e\n\u003ch2\u003eSupplied Accessories: \u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e9 x 50mm straight-through finder\u003c\/li\u003e\n\u003cli\u003e20mm 1.25\" Plössl eyepiece (60x)\u003c\/li\u003e\n\u003cli\u003e2x 1.25\" Barlow with built-in photo adapter\u003c\/li\u003e\n\u003cli\u003e2\" rack and pinion focuser with 1.25\" adapter\u003c\/li\u003e\n\u003cli\u003e1.25\" prism-type 90° star diagonal\u003c\/li\u003e\n\u003cli\u003eMulticoated 150mm aperture 1200mm focal length f\/8 achromatic optics\u003c\/li\u003e\n\u003cli\u003eLens shade\u003c\/li\u003e\n\u003cli\u003eDust covers\u003c\/li\u003e\n\u003cli\u003eTube rings with dovetail\u003c\/li\u003e\n\u003c\/ul\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\"\u003e6\"\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\/8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e19 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e300x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e18 lbs.\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\"\u003e13.5\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\u003cul\u003e\n\u003cli\u003e9 x 50mm straight-through finder\u003c\/li\u003e\n\u003cli\u003e20mm 1.25\" Plössl eyepiece (60x)\u003c\/li\u003e\n\u003cli\u003e2x 1.25\" Barlow with built-in photo adapter\u003c\/li\u003e\n\u003cli\u003e2\" rack and pinion focuser with 1.25\" adapter\u003c\/li\u003e\n\u003cli\u003e1.25\" prism-type 90° star diagonal\u003c\/li\u003e\n\u003cli\u003eMulticoated 150mm aperture 1200mm focal length f\/8 achromatic optics\u003c\/li\u003e\n\u003cli\u003eLens shade\u003c\/li\u003e\n\u003cli\u003eDust covers\u003c\/li\u003e\n\u003cli\u003eTube rings with dovetail\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40221652516937,"sku":"C6ROTA","price":999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/11923_1.jpg?v=1662967316"},{"product_id":"toa-130nfb-5-1-ortho-apochromat-triplet-refractor-ota","title":"Takahashi TOA-130NFB 5.1\" Ortho-Apochromat Triplet Refractor OTA","description":"\u003cp\u003eThis performance of this 4\" focuser Takahashi 5.1\" ED triplet refractor is too good to let it be called simply an apochromatic scope. Only the term ortho-apochromatic is accurate enough to describe its optical excellence, both visually and for medium format and 35mm\/large format CCD imaging.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Takahashi refractor optical tube has: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e • 130mm f\/7.7 Ortho-Apochromat ED triplet optics \u003cbr\u003e• 4\" rack and pinion focuser with 2\" and 1.25\" eyepiece adapters \u003cbr\u003e• retractable dew shield \u003cbr\u003e• camera angle adjuster \u003cbr\u003e• 250mm of back focus for CCD and medium format film imaging \u003cbr\u003e• state-of-the-art optical performance, exceeding even fluorite scopes\u003cbr\u003e• 5-year warranty \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e    The Takahashi TOA-130NFB refractor provides exceptionally high optical and mechanical quality for the serious visual and photographic observer who needs optics of reasonable portability. The TOA-130 is exceptional for observing and imaging within the solar system. Its images of subtle lunar and planetary details are sharp, with realistic and highly saturated color. They are free from chromatic aberration's violet haze of spurious color, thanks to the scope's ED triplet optics. The latest antireflection multicoatings and numerous knife-edge internal baffles assure the maximum image contrast possible. \u003cbr\u003eThis 5.1\" Takahashi has a large aperture and diffraction-free images that make it surprisingly good for much deep space observing, as well. Binary stars and globular star clusters are particularly well-resolved and vivid, with the contrasting colors of many binary systems showing nicely. The brighter nebulas and galaxies stand out against a very dark sky background. Its 4\" focuser permits medium format imaging of a huge 5.3° swath of the sky with pinpoint images when using an optional focal reducer. \u003cbr\u003eThe TOA-130's f\/7.7 focal ratio and 1000mm focal length is long enough, using a Takahashi 2.8mm ED eyepiece to provide 357x, for high magnification observations of the Moon and planets, yet it will also produce a huge 2.5° field at 20x, using a 2\" Takahashi 50mm eyepiece.\u003cstrong\u003e\u003c\/strong\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Telescope's Optical and Mechanical Systems . . . \u003c\/strong\u003e\u003c\/p\u003e\n\u003cblockquote\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eApochromatic triplet ED refractor optics: \u003c\/strong\u003e.1\" (130mm) aperture, 1000mm focal length, f\/7.7 Ortho-Apochromatic triplet lens using an FPL-53 ED (Extra-low Dispersion) glass element between two crown glass elements for images that are free from spurious color (chromatic aberration). \u003cspan style=\"font-family: verdana;\"\u003eFor more details, click on the \"Takahashi triplet lens\" icon above.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulticoated optics: \u003c\/strong\u003eFully coated on all surfaces with multiple layers of antireflection materials for high light transmission and good contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable dew shield: \u003c\/strong\u003eSlows the formation of dew on the lens to extend your undisturbed observing time. Also improves visual and photographic contrast by shielding the lens from off-axis ambient light (the neighbor's yard light, moonlight, etc.) For transport, the retractable lens shade keeps the overall length of the optical tube to a manageable 32\" when it is retracted and the visual extension tube removed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRack and pinion focuser: \u003c\/strong\u003e4\" focuser, with a 2\" eyepiece\/accessory holder that threads into the camera angle adjuster attached to the focuser drawtube. A 1.25\" compression ring eyepiece\/star diagonal holder is also supplied. The non-marring soft nylon compression ring of the 1.25\" eyepiece holder won't scratch the barrels of your accessories or star diagonal, as ordinary thumbscrews can. Dual focusing knobs provide precise image control with either hand. The large focus knobs are easy to operate, even while wearing gloves or mittens in cold weather. \u003cbr\u003eThe 4\" focuser yields a 92mm image circle for medium format prime focus photography with a Mamiya 645 or Pentax 6x7 camera. Needless to say, the 92mm image circle also allows absolutely unvignetted imaging with 35mm film cameras and the new 35mm-size and larger CCD chips. A large thumbscrew locks the focuser tube in place without image shift at the correct photographic focus. \u003cbr\u003eThe built-in camera angle adjuster allows the photographic accessory train to be rotated to the most appropriate angle to frame the object being photographed (a landscape format, portrait, or any angle in between) without having to loosen the camera adapter and perhaps lose the correct focus. Once the camera is oriented correctly, a large knob on the side of the adjuster can be tightened to hold the camera in place during the exposure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinderscope mounting point: \u003c\/strong\u003eNo finderscope is supplied, but a flat boss with two mounting bolt holes is provided on the top of the focuser body for mounting an optional finderscope. The Takahashi 7x50mm 6.2° field finder and bracket shown below are recommended.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong back focus: \u003c\/strong\u003eBack focus is a very good 250mm, allowing the stacking of a wide variety of CCD cameras, color filter wheels, electric focusers, and film cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptional photographic accessories: \u003c\/strong\u003eThree accessories are available to provide a variety of image scales and sky coverage: a field flattener, a focal reducer, and an extender. The field flattener reduces the focal ratio slightly (to f\/7.68) and gives pinpoint stars to the very edges of the 92mm (5.3° field) image circle for unvignetted medium format (6x7cm) and 35mm images. The central 70mm of the field is fully illuminated, with a gradual falloff to 85% illumination at the edges of the field. The focal reducer effectively cuts the focal length to 750mm and the focal ratio to f\/5.76. The photographic field is now 3.8°, spread over a 50mm image circle for totally non-vignetted 35mm photography. A 1.6x extender (which can also be used visually) effectively increases the focal length to 1600mm and the focal ratio to f\/12.3. The photographic field is 1.4° with this extender in use. A variety of photographic coupling attachments and eyepiece projection photography adapters are also available.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting rings: \u003c\/strong\u003eNo mounting rings are supplied for the 155mm diameter optical tube. Two options are available. One is the Takahashi tube holder (#130TH) shown below that is designed specifically for mounting the TOA-130 on a Takahashi EM-200 or larger equatorial mount. The second option is a pair of Parallax split mounting rings (#PFS152), also shown below, for mounting on a non-Takahashi mount, such as a Losmandy G-11.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/blockquote\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003eTech Details: \u003cbr\u003e\n\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\"\u003e5\"\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\"\u003e1000mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/7.7\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\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e278x\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\"\u003e22 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\"\u003e0.89 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e13.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e5 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":40221652582473,"sku":"TOA131","price":6760.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/12142_1.jpg?v=1662967319"},{"product_id":"toa-150b-5-9-f-7-33-ortho-apochromat-triplet-refractor-ota","title":"Takahashi TOA-150B 5.9\" F\/7.33 Ortho-Apochromat Triplet Refractor OTA","description":"\u003cp\u003eThis big Takahashi 5.9\" ED triplet refractor is optically too good to be called simply an apochromatic scope. Only the term ortho-apochromatic is good enough to describe its optical excellence.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Takahashi refractor optical tube has: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e • 150mm f\/7.33 Ortho-Apochromat triplet optics with dual ED elements \u003cbr\u003e• 4\" rack and pinion focuser with camera angle adjuster and 10:1 fine focus \u003cbr\u003e• retractable dew shield \u003cbr\u003e• state-of-the-art optical performance, exceeding even fluorite scopes\u003cbr\u003e• 5-year warranty \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e    The Takahashi TOA-150 refractor provides exceptionally high optical and mechanical quality for the serious visual observer and astrophotographer. The TOA-150 is exceptional for observing and imaging within the solar system. Its images of subtle lunar and planetary details are sharp, with realistic and highly saturated color. They are totally free from chromatic aberration's violet haze of spurious color, thanks to the scope's ED triplet optics. The latest antireflection multicoatings and numerous knife-edge internal baffles assure the maximum image contrast possible.\u003c\/p\u003e\n\u003cp\u003e  \u003cbr\u003eThe 5.9\" aperture of the TOA-150 provides a visual limiting magnitude of 13.4, and a photographic limiting magnitude of well over 15, making it excellent for deep space observing as well. The brighter nebulas and galaxies stand out crisply against a very dark sky background. Binary stars and globular star clusters are particularly well-resolved, thanks to its diffraction-free images, and its freedom from spurious color vividly shows the contrasting colors present in many binary systems.\u003c\/p\u003e\n\u003cp\u003e  \u003cbr\u003eThe TOA-150's f\/7.33 focal ratio and 1100mm focal length is long enough, using a 3mm eyepiece to provide 367x, for very high magnification observations of the Moon and planets. It is equally capable of producing a huge 2.27° field at 22x, with a bright 6.8mm exit pupil, using a 2\" Takahashi 50mm eyepiece.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Telescope's Optical System . . . \u003c\/strong\u003e\u003c\/p\u003e\n\u003cblockquote\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eapochromatic triplet ED refractor optics: \u003c\/strong\u003e5.9\" (150mm) aperture, 1100mm focal length, f\/7.33 Ortho-Apochromatic triplet lens using two FPL-53 ED (Extra-low Dispersion) glass element flanking a crown glass element for pinpoint stars and images that are free from spurious color (chromatic aberration).\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulticoated optics: \u003c\/strong\u003eFully coated on all surfaces with multiple layers of antireflection materials for high light transmission and good contrast.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/blockquote\u003e\n\u003cp\u003e\u003cstrong\u003eThis Telescope's Mechanical System . . . \u003c\/strong\u003e\u003c\/p\u003e\n\u003cblockquote\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable dew shield: \u003c\/strong\u003eSlows the formation of dew on the lens to extend your undisturbed observing time. Also improves visual and photographic contrast by shielding the lens from off-axis ambient light (the neighbor's yard light, moonlight, etc.) For transport, the retractable lens shade keeps the overall length of the optical tube to a manageable 38\" when it is retracted and the visual extension tube removed.\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarry handle: \u003c\/strong\u003eA carry handle at the rear of the tube, just before the focuser, allows easy transport of the optical tube.\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuick release for optional finderscope: \u003c\/strong\u003eA quick release bracket on the focuser body holds an optional 7x50mm Takahashi finder and mounting bracket, allowing easy removal of the finder for travel and storage.\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRack and pinion focuser: \u003c\/strong\u003e4\" focuser, with a 2\" eyepiece\/accessory holder that threads into the focuser drawtube. A 1.25\" compression ring eyepiece\/star diagonal holder is also supplied. The non-marring soft nylon compression rings of the 2\" and 1.25\" eyepiece holders won't scratch the barrels of your accessories or star diagonal, as ordinary thumbscrews can. Dual focusing knobs provide precise image control with either hand. The large focus knobs are easy to operate, even while wearing gloves or mittens in cold weather. There is a 10:1 ratio micro-fine focuser on one knob as standard equipment. This provides ultra-precise focusing for critical high magnification visual use and astrophotography. A large thumbscrew locks the focuser tube in place without image shift at the correct photographic focus.\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong back focus: \u003c\/strong\u003eBack focus is a very good 225mm, allowing the stacking of a wide variety of CCD cameras, color filter wheels, electric focusers, and film cameras.\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptional photographic accessories: \u003c\/strong\u003eThree accessories are available to provide a variety of image scales and sky coverage: two focal reducers and an extender. \u003cbr\u003eThe small focal reducer \u003ca href=\"\/takahashi-super-reducer-for-takahashi-toa130-with-4-inch-focuser_p5370.aspx\"\u003e(#TAK130RE)\u003c\/a\u003e effectively cuts the focal length to 860mm and the focal ratio to f\/5.73. The photographic field is now 3.33°, spread over a 50mm image circle for non-vignetted 35mm photography. \u003cbr\u003eThe large focal reducer \u003ca href=\"\/super-reducer-for-takahashi-toa-150-refractor_p13271.aspx\"\u003e(#TAK150RE)\u003c\/a\u003e is designed for medium format photography. It also effectively cuts the focal length to 860mm and the focal ratio to f\/5.73. The photographic field is now 6°, spread over a 90mm image circle for medium format (6x7) photography. \u003cbr\u003eA 1.6x extender \u003ca href=\"\/takahashi-2-inch-1-6x-extender-t_p5105.aspx\"\u003e(#XTND-T)\u003c\/a\u003e effectively increases the focal length to 1760mm and the focal ratio to f\/11.7. The photographic magnification (compared to a 50mm camera lens) is 35.2x with this extender in use and the field is 1.3°, making it excellent for lunar photography. The extender can also be used visually. \u003cbr\u003eA variety of photographic coupling attachments and eyepiece projection photography adapters are also available.\u003c\/li\u003e\n\u003c\/ul\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\"\u003e5.9\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBinary and Star Cluster Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eGreat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1100mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/7.33\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\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e367x\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\"\u003e32 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePlanetary Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eGreat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.77 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\"\u003e5 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/blockquote\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":40221653991497,"sku":"TOA150","price":13070.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/13266_1.jpg?v=1662967384"},{"product_id":"11-sct-optical-tube-cge-losmandy-dovetail","title":"Celestron 11\" SCT Optical Tube, CGE\/Losmandy Dovetail","description":"\u003cp\u003eThis 24\" long aluminum Celestron 11\" Schmidt Cassegrain optical tube weighs only 27.5 lbs., making it easy to transport. It has an 11\" aperture, a 2800mm focal length, and a focal ratio of f\/10. An optional focal reducer is available to bring the focal ratio down to f\/6.3 for CCD and 35mm photography. Optical performance is guaranteed to be diffraction-limited.\u003c\/p\u003e\n\u003cp\u003eAdvanced high transmission Starbright XLT optical multicoatings are standard equipment. This coatings package includes high reflectivity multilayer aluminum mirrors enhanced with titanium dioxide for high reflectivity, plus a unique combination of magnesium fluoride and hafnium dioxide antireflection coatings on both sides of the Schmidt corrector lens. The corrector lens itself is made of high transmission water white float glass instead of conventional soda lime glass (which has 3.5% lower transmission) used in other telescopes.\u003c\/p\u003e\n\u003cp\u003eStarbright XLT multicoatings visibly increase the contrast on subtle lunar, planetary, and nebula details when compared with a scope with standard multicoatings. They also give you higher light transmission for brighter deep space images and shorter exposure times during CCD and 35mm photography. Across the total visual\/photographic spectrum from 400nm to 750nm, independent laboratory tests show the new Starbright XLT coatings are 16% brighter overall than even the original industry-standard Starbright multicoatings.\u003c\/p\u003e\n\u003cp\u003eThe optical tube comes with a big 9 x 50mm straight-through achromatic finderscope and mounting bracket. The finder has a wide 5° field of view. It focuses by loosening the trim ring behind the objective lens cell, screwing the lens cell in or out to focus, and tightening the trim ring to lock in the correct focus. Also standard is a removable 1.25\" visual back that holds visual accessories such as a star diagonal, tele-extender, etc. A 1.25\" prism type star diagonal is also standard, as is a 1.25\" 40mm Plössl eyepiece. This eyepiece provides a magnification of 70x. Its field of view is 0.68° across, over a third wider than the full moon. Dust covers for the optics are also supplied.\u003c\/p\u003e\n\u003cp\u003eThe optical tube is equipped with a slide bar with a standard 75mm (3\") wide dovetail for mounting the tube on Losmandy Style saddles.\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\"\u003e2800mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e27.5 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e560x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e27.5 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\u003eTelescope Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eSchmidt-Cassegrain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e14.7\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\u003e\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e\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\u003eStarbright XLT multicoated optics\u003c\/li\u003e\n\u003cli\u003e40mm 1.25\" Plössl eyepiece (70x)\u003c\/li\u003e\n\u003cli\u003e1.25\" visual back\u003c\/li\u003e\n\u003cli\u003e1.25\" prism-type star diagonal\u003c\/li\u003e\n\u003cli\u003e9 x 50mm straight-through finderscope\u003c\/li\u003e\n\u003cli\u003eDust covers\u003c\/li\u003e\n\u003cli\u003eDovetail for mounting on Celestron CGE and Losmandy G-11 and HGM Titan mounts\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40221657825353,"sku":"C11OTAX","price":3299.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/91036-xlt_cge_pro_1100_3.jpg?v=1662967511"},{"product_id":"tv-60-60mm-f-6-apo-body","title":"TeleVue TV-60 60mm f\/6 APO Refractor Body","description":"\u003cp\u003eThis TeleVue TV-60 is a high performance 2.4\" apochromatic doublet scope that will surprise you as much with the magnitude of its performance as it does with the mini size of its compact \"go anywhere, any time\" body . . .\u003c\/p\u003e\n\u003cdiv class=\"heading\"\u003e\u003cstrong\u003eThis TeleVue refractor optical tube 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• 60mm f\/6 apochromatic SD doublet optics \u003cbr\u003e• two-stage focuser (drawtube, plus helical fine focus) \u003cbr\u003e• extreme portability (10\" long, and weighing only 3 lbs.) \u003cbr\u003e• 5-year warranty\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e\u003c\/div\u003e\n\u003cp\u003eThis TeleVue TV-60 refractor optical tube is an amazing little scope. A review of the TV-60 in the December 2004 Sky \u0026amp; Telescope magazine said, \"If you think that size matters and that bigger is always better when it comes to telescopes, think again . . .\u003c\/p\u003e\n\u003cp\u003e\"My first serious use of the TV-60 tested the 'Take Me Everywhere' portability touted by the manufacturer (on a trip to Italy to view Venus Transit of June 2004.) The transit made me realize that the TV-60 just might be the ultimate scope for eclipse chasers . . . As I have come to expect from observing with TeleVue's other short-focus apo refractors, the views with the TV-60 are essentially free of false color . . . Even at 120x, brilliant Vega, one of the most challenging stars for a refractor to image cleanly, appears as a blue-white Airy disk surrounded by several white diffraction rings and no perceptible color halo . . .\u003c\/p\u003e\n\u003cp\u003e\"After many nights of observing, I'm comfortable recommending an upper limit of 180x for the TV-60, which is 75x per inch of aperture. I achieved this magnification with the 2-mm setting on the TeleVue 2-to-4-mm Nagler Zoom eyepiece. It offered exceptional views of binary stars (especially the well-known Double-Double in Lyra) and the Moon . . .\u003c\/p\u003e\n\u003cp\u003e\"The pint-sized TV-60 could match the best high-power view I have ever seen in a quality 60-mm f\/15 refractor. And the TV-60 could do something those other scopes couldn't: offer a stunning wide-field experience . . . With just three eyepieces - the 24mm Panoptic and the 9- and 2.5-mm Naglers - I spent hours wandering the Milky Way from Sagittarius to Cassiopeia.\"\u003c\/p\u003e\n\u003cp\u003eThis Telescope's Optical and Mechanical Systems . . .\u003c\/p\u003e\n\u003cp\u003eApochromatic SD doublet optics: 2.4\" (60mm) aperture, 360mm focal length, f\/6 apochromatic doublet lens using an SD (Special Dispersion) glass element. Images are essentially free from spurious color (chromatic aberration), even at magnifications over the theoretical limit of 60x per inch of aperture (as noted in the review above.)\u003c\/p\u003e\n\u003cp\u003eMulticoated optics: Fully coated on all surfaces with multiple layers of antireflection materials for high light transmission and good contrast.\u003c\/p\u003e\n\u003cp\u003eDual-stage focuser: The 2-stage 1.25\" focuser uses a quick-focus drawtube for initial focusing, plus a separate helical-focusing eyepiece holder for fine-tuning the image sharpness once you've reached an approximate focus with the drawtube. Nylon thumbscrews lock in the drawtube focus and hold optional 1.25\" optical accessories securely in place.\u003c\/p\u003e\n\u003cp\u003eDew shield: The scope comes with a sliding captive dew shield to slow the formation of dew and act like a camera lens shade to improve contrast by blocking ambient light (from a neighbor's back yard security light, for example.) A camera-style snap-in plastic dust cap protects the optics from damage while stored or traveling.\u003c\/p\u003e\n\u003cp\u003eStar diagonal: No star diagonal is supplied, as most observers buy the TV-60 as a second 'grab and go' scope and therefore already have a star diagonal from their primary telescope. This allows you to equip the TV-60 with the optical accessories that best suit your observing style - such as an in-line Porro prism or a 45º image erecting diagonal for terrestrial observing, or a 60º or 90º star diagonal for astronomical use.\u003c\/p\u003e\n\u003cp\u003eEyepiece: As with a star diagonal, none is supplied, as it is assumed that the buyer already has a selection of eyepieces from his or her primary scope. A good optional basic eyepiece might be TeleVue's 11mm Plössl. This premium eyepiece provides a magnification of 33x, with a field of view more than three times as wide as the full Moon. Optional shorter focal length eyepieces and\/or Barlow lenses will provide high powers to let you examine details in the storm belts of Jupiter, the rings of Saturn, the mountains of the Moon, and much more. And the resolution of those details will be crisp and detailed, often visibly superior to larger telescopes more easily affected by atmospheric conditions. The maximum power for lunar\/planetary viewing is 180x, with the optional 2-4mm Nagler Zoom. Put in an optional longer focal length (lower power) eyepiece and the TV-60 becomes a true rich field telescope, capable of scanning wide scenic vistas by day and revealing multitudes of large, faint deep space objects by night. With an optional 1.25\" 40mm TeleVue Plössl (9x, with a 4.3° field), the TV-60 is not only a surprisingly good little rich field scope, but it is its own best finderscope, as well. It's also excellent as a terrestrial spotting scope for vacations, birding, or nature studies. In addition, optional camera adapters turn the TV-60 into excellent 360mm (7.2x) f\/6 telephoto lens for terrestrial and lunar photography.\u003c\/p\u003e\n\u003cp\u003eFinderscope: No finderscope is supplied or needed. As noted above, with a 40mm TeleVue Plössl eyepiece, the TV-60 its own best finderscope.\u003c\/p\u003e\n\u003cp\u003eMounting system: The TV-60 has an adjustable dovetail balancing bar mount that fits on any optional sturdy photo tripod for casual use, or on an optional equatorial or altazimuth mount (such as the TeleVue Tele-Pod and Panoramic mounts and the Vixen\/TeleVue PORTA mount) for more serious observing. An available optional X-Y axis adjustable mounting bracket (#TVXYA) allows the TV-60 to be used as a superfinder on TeleVue refractors, while a separate adapter (#TVXYC) allows it to be used on Celestron and Meade Schmidt-Cassegrain telescopes, as well as on TeleVue scopes. The balancing bar system allows the TV-60 to be moved fore and aft on your mount or tripod to balance the weight of different eyepieces or a camera.\u003c\/p\u003e\n\u003cp\u003eThere are few optical systems that combine into one very compact body the ability to be customized into a serious astronomical telescope with true apochromatic optics, a terrestrial spotting scope, and a top-quality telephoto lens - but the TV-60 does it surprisingly well. Whether you want to observe the skies from your back yard on the spur of the moment, or travel round the world with a very portable telescope that will reveal and photograph everything nearby and distant, you'll find it hard to beat this truly exceptional TeleVue small refractor.\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\"\u003e2.4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e360mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e3 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e180x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e3 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1.93 arc seconds\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\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e11.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e5 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\u003cul\u003e\n\u003cli\u003e60mm apochromatic doublet optics\u003c\/li\u003e\n\u003cli\u003e2-stage drawtube\/helical focuser\u003c\/li\u003e\n\u003cli\u003eRetractable lens shade\u003c\/li\u003e\n\u003cli\u003eDust covers\u003c\/li\u003e\n\u003cli\u003eCarrying pouch\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":40221657858121,"sku":"TV60","price":867.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/TVO_2460_TV60ota_layout_v4copy.jpg?v=1723750815"},{"product_id":"8-sct-optical-tube-cge-losmandy-dovetail","title":"Celestron 8\" SCT Optical Tube, CGE\/Losmandy Dovetail","description":"\u003cp\u003eThe Celestron C8 was the first Schmidt-Cassegrain telescope available to amateur astronomers. This 8\" f\/10 optical tube is the direct, but much improved, descendent of that original astronomical triumph. The rugged aluminum optical tube is only 17\" long and weighs only 13 lbs., making it easy to transport and set up. An optional focal reducer (#8325) is available to bring the focal ratio down to a fast f\/6.3 for CCD and 35mm photography.\u003c\/p\u003e\n\u003cp\u003eAdvanced Starbright XLT multicoatings are standard equipment. This coatings package includes high reflectivity multilayer aluminum mirrors enhanced with titanium dioxide for high reflectivity, plus a unique combination of magnesium fluoride and hafnium dioxide antireflection coatings on both sides of the Schmidt corrector lens. The corrector lens itself is made of high transmission water white float glass instead of conventional soda lime glass (which has 3.5% lower transmission) used in other telescopes.\u003c\/p\u003e\n\u003cp\u003eStarbright XLT multicoatings visibly increase the contrast on subtle lunar, planetary, and nebula details when compared with a scope with standard multicoatings. They also give you higher light transmission for brighter deep space images and shorter exposure times during CCD and 35mm photography. Across the total visual\/photographic spectrum from 400nm to 750nm, independent laboratory tests show the new Starbright XLT coatings are 16% brighter overall than even the original industry-standard Starbright multicoatings.\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e\n\u003cp\u003eThe optical tube comes with a 6 x 30mm straight-through achromatic finderscope and mounting bracket. The finder has a wide 7° field of view. It focuses by loosening the trim ring behind the objective lens cell, screwing the lens cell in or out to focus, and tightening the trim ring to lock in the correct focus. Also included is a removable 1.25\" visual back that holds visual and photographic accessories such as a star diagonal, tele-extender, etc. A 1.25\" prism type star diagonal is also standard, as is a 1.25\" 25mm Plössl eyepiece. This eyepiece provides a magnification of 81x, with a 0.59° field that's almost 20% larger than the full moon.\u003c\/p\u003e\n\u003cp\u003eA 4\" wide dovetail slide bar runs the length of the tube for mounting on a Celestron CGE\/CGEM\/CGX or Losmandy GM8\/G11 German equatorial mount. Optional split mounting rings are also available to put the tube on another mount of the buyer's choosing. Dust covers for the optics complete the supplied accessories.\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\"\u003e2032mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e13 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e406x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e13 lbs.\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\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40221657956425,"sku":"C8OTAX","price":1399.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/5848_1.jpg?v=1662967514"},{"product_id":"9-25-sct-optical-tube-cge-losmandy-dovetail","title":"Celestron 9.25\" SCT Optical Tube, CGE\/Losmandy Dovetail","description":"\u003cp\u003eThis 9.25\" aperture optical tube gathers 33% more light than an 8\" scope, providing brighter images of faint deep space objects. Its light-gathering ability is over 1125 times that of even the sharpest dark-adapted eye. The optical design uses a longer focal length primary mirror and lower magnification secondary mirror than a conventional SCT. This yields a flatter field of view at the focal plane. It also reduces optical aberrations during photography and when using wide field long focal length 2\" eyepieces. An optimized baffle system further improves astrophotography by minimizing vignetting at the corners of a 35mm negative or large format CCD.\u003c\/p\u003e\n\u003cp\u003eAdvanced Starbright XLT multicoatings are standard equipment. This coatings package includes high reflectivity multilayer aluminum mirrors enhanced with titanium dioxide for high reflectivity, plus a unique combination of magnesium fluoride and hafnium dioxide antireflection coatings on both sides of the Schmidt corrector lens. The corrector lens itself is made of high transmission water white float glass instead of conventional soda lime glass (which has 3.5% lower transmission) used in other telescopes.\u003c\/p\u003e\n\u003cp\u003eStarbright XLT multicoatings visibly increase the contrast on subtle lunar, planetary, and nebula details when compared with a scope with standard multicoatings. They also give you higher light transmission for brighter deep space images and shorter exposure times during CCD and 35mm photography. Across the total visual\/photographic spectrum from 400nm to 750nm, independent laboratory tests show the new Starbright XLT coatings are 16% brighter overall than even the original industry-standard Starbright multicoatings.\u003c\/p\u003e\n\u003cp\u003eThe rugged aluminum optical tube is only 22\" long and weighs only 20 lbs., making it easy to transport and set up. An optional focal reducer (#8325) is available to bring the focal ratio down to a fast f\/6.3 for CCD and 35mm photography.\u003c\/p\u003e\n\u003cp\u003eA review of Celestron 9.25\" optics in Astronomy magazine said the optics were \"a real winner . . . (Jupiter's) belts were simply dazzling, with subtle colors and the most tenuous detail seen steadily . . . (Saturn's) rings were very impressive, and both Cassini's Division and the C ring were easily visible . . . Deep sky objects were no less appealing . . . the Orion Nebula was wonderful, showing its gossamer clouds in all sorts of intricate contortions. Buried within the clouds, all four stars of the Trapezium sparkled, and even the more challenging E and F Trapezium members shown through . . . The telescope delivered consistently good images of these celestial gems - a sign of superb optical quality.\"\u003c\/p\u003e\n\u003cp\u003eThe optical tube comes with a 6 x 30mm straight-through achromatic finderscope and mounting bracket. The finder has a wide 7° field of view. It focuses by loosening the trim ring behind the objective lens cell, screwing the lens cell in or out to focus, and tightening the trim ring to lock in the correct focus. Also included is a removable 1.25\" visual back that holds visual and photographic accessories such as a star diagonal, tele-extender, etc. A 1.25\" prism type star diagonal is also standard, as is a 1.25\" 25mm Plössl eyepiece. This eyepiece provides a magnification of 94x, with a 0.51° field that's slightly larger than the full Moon.\u003c\/p\u003e\n\u003cp\u003eA 4\" wide dovetail slide bar runs the length of the tube for mounting the optical tube with a Losmandy width saddle. Optional split mounting rings are also available to put the tube on another mount of the buyer's choosing. Dust covers for the optics complete the supplied accessories.\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\"\u003e9.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2350mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e20 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e470x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e20 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.49 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e14.4\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","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40221657989193,"sku":"C9OTAX","price":1999.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/91027-xlt_cge_pro_925_2.jpg?v=1662967516"},{"product_id":"14-sct-fastar-compatible-optical-tube-cge-losmandy-dovetail","title":"Celestron 14\" SCT Fastar-Compatible Optical Tube, CGE\/Losmandy Dovetail","description":"\u003cp\u003eThere are state-of-the-art Starbright XLT multicoatings on the hand-figured 14\" aperture SCT optics of this impressive optical tube, plus a Fastar-compatible secondary that lets you add an accessory lens to cut the focal ratio to an astonishing f\/2.1 for CCD imaging.\u003c\/p\u003e\n\u003cp\u003eThis impressive 45 lb. 14\" Celestron Schmidt Cassegrain aluminum optical tube has a state-of-the-art Starbright XLT multicoated Fastar-compatible optics and a light grasp that's an amazing 2581 times that of even the sharpest dark-adapted eye (36% greater than a 12\" telescope and almost twice that of a 10\" scope). With the effective light-gathering power of that many eyes, the Schmidt-Cassegrain optics of this optical tube can reveal to you faint deep space objects in amazing and intricate visual and photographic detail. It has a 3910mm focal length and a focal ratio of f\/11. An optional focal reducer is available to bring the focal ratio down to f\/6.9 for CCD and 35mm photography. Optical performance is guaranteed to be diffraction-limited.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe optics are Fastar compatible. This special optical system allows you to replace the scope's secondary mirror assembly with an auxiliary Fastar lens and a suitable CCD camera (an exchange that takes only minutes) for wide field CCD imaging at an incredibly fast f\/2.1 focal ratio.\u003c\/p\u003e\n\u003cp\u003eAdvanced high transmission Starbright XLT optical multicoatings are standard equipment. This coatings package includes high reflectivity multilayer aluminum mirrors enhanced with titanium dioxide for high reflectivity, plus a unique combination of magnesium fluoride and hafnium dioxide antireflection coatings on both sides of the Schmidt corrector lens. The corrector lens itself is made of high transmission water white float glass instead of conventional soda lime glass (which has 3.5% lower transmission) used in other telescopes.\u003c\/p\u003e\n\u003cp\u003eStarbright XLT multicoatings visibly increase the contrast on subtle lunar, planetary, and nebula details when compared with a scope with standard multicoatings. They also give you higher light transmission for brighter deep space images and shorter exposure times during CCD and 35mm photography. Across the total visual\/photographic spectrum from 400nm to 750nm, independent laboratory tests show the new Starbright XLT coatings are 16% brighter overall than even the original industry-standard Starbright multicoatings.\u003c\/p\u003e\n\u003cp\u003eThe optics are hand-figured. Hand figuring the optical system is a complex optical procedure done on a commercial basis only by Celestron. Four separate optical tests are made on every set of optics, using a double-pass laser autocollimator - an Airy disc inspection, a test for spherical aberration by examining the diffraction images on both sides of focus, a Ronchi grating test, and a knife edge test. A skilled optician evaluates these tests. He then fabricates a precision pitch lap and delicately hand polishes the secondary mirror to compensate for any small residual zonal defects and smooth the optical figure. Done a few strokes at a time, and testing constantly to evaluate their effect, this final hand-figuring can take hours. But, when it is finished, the optical performance makes every tedious hour of hand-crafting well worth the effort.\u003c\/p\u003e\n\u003cp\u003eThe optical tube comes with a big 9 x 50mm straight-through achromatic finderscope and mounting bracket. The finder has a wide 5° field of view. It focuses by loosening the trim ring behind the objective lens cell, screwing the lens cell in or out to focus, and tightening the trim ring to lock in the correct focus. Also standard is a 2\" mirror-type star diagonal, as is a 1.25\" 40mm plossl eyepiece. This eyepiece provides a magnification of 98x. Its field of view is 0.51° across, as wide as the full Moon. Dust covers for the optics are also supplied.\u003c\/p\u003e\n\u003cp\u003eThe optical tube is equipped with a slide bar with a standard 75mm (3\") wide dovetail for mounting the tube on a Celestron CGX-L Computerized German equatorial mount or a suitable mount that has a losmandy style saddle plate.\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\"\u003e14\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e3910mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/11\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e45 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e652x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e45 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.33 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e15.3\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\u003cul\u003e\n\u003cli\u003eStarbright XLT multicoatings\u003c\/li\u003e\n\u003cli\u003eFastar-compatible optics\u003c\/li\u003e\n\u003cli\u003e40mm 2\" E-Lux Kellner eyepiece (98x)\u003c\/li\u003e\n\u003cli\u003e2\" mirror-type star diagonal\u003c\/li\u003e\n\u003cli\u003e9 x 50mm straight-through finderscope\u003c\/li\u003e\n\u003cli\u003eDust covers\u003c\/li\u003e\n\u003cli\u003eDovetail for mounting on Celestron CGE and Losmandy G-11 and HGM Titan mounts\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40221658120265,"sku":"C14OTAFX","price":6799.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/91038-xlt_cge_pro_1400_fastar_2.jpg?v=1662967521"},{"product_id":"np101is-4-f-5-4-nagler-petzval-apochromatic-refractor","title":"TeleVue NP101Is 4\" f\/5.4 Nagler-Petzval Apochromatic Refractor","description":"\u003cp\u003eThis TeleVue NP-101is is a superb and highly portable apochromatic refractor for both visual observing and imaging . . .\u003c\/p\u003e\n\u003cdiv class=\"heading\"\u003eThis updated and improved TeleVue NP101is refractor optical tube has:\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e• 101mm f\/5.4 four-element Nagler-Petzval apochromatic optical system \u003cbr\u003e• 2.4\" rack and pinion focuser with 2\" accessory adapter \u003cbr\u003e• Focusmate 10:1 ratio dual-speed fine focus made by Starlight Instruments \u003cbr\u003e• stainless steel lens cell for improved thermal stability\u003cbr\u003e• longer retractable dew shield for improved contrast \u003cbr\u003e• state-of-the-art visual and imaging capabilities \u003cbr\u003e• 5-year warranty\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe Backyard Astronomer's Guide said of the original TeleVue NP101, \"optics don't get any better than this;\" while Sky \u0026amp; Telescope gave the NP101 top honors (May and June 2002) and selected it as the test instrument for its landmark review of the SBIG STL11000 CCD camera (July 2004). Featuring a new enlarged 2.4\" focuser and redesigned optics, this new TeleVue NP101is (Imaging System) improves and extends the photographic capability of the original NP101.\u003c\/p\u003e\n\u003cp\u003eThe new TeleVue NP101is sets new optical and mechanical quality standards in a moderately small and highly portable apochromatic refractor for the serious observer and astrophotographer. TeleVue first reinterpreted the incredible design flexibility of the time-proven Petzval portrait lens into an astronomical objective over 20 years ago. They've been refining the design ever since. Nagler-Petzval optics permit the optical designer greater freedom to simultaneously correct for coma, astigmatism, field curvature, secondary spectrum, spherical aberration, and spherochromatism than any other commercial optical design.\u003c\/p\u003e\n\u003cp\u003eThis newest 4\" four-element air-spaced Nagler-Petzval system has a 101mm aperture ED doublet at the front of the scope, with a second field-flattening\/aberration-correcting ED doublet at the rear. This combination of materials and design gives the TeleVue NP101is diffraction-limited apochromatic (spurious color-free) performance across the entire visual spectrum. In addition to exceptional visual performance, both inside the solar system and beyond, it has been optimized for deep space imaging, particularly with CCD cameras having large format detector chips with diagonals up to 50mm across. Every optical and mechanical element has been optimized to work as a single integrated unit, with new features to make imaging easier and more flexible.\u003c\/p\u003e\n\u003cp\u003eFor visual use, the scope's 540mm focal length is long enough, using a 1.25\" TeleVue 2.5mm Nagler eyepiece, to provide 216x for high magnification observations of the Moon, planets, and binary stars; yet it will also produce a huge 4.1° field at 15x, using a 2\" TeleVue 35mm Panoptic eyepiece for wide field observing.\u003c\/p\u003e\n\u003cp\u003eIts image quality, easy set-up, and airline portability make it a scope you will use often. Manufacturing advances in lens finishing, including interferometric monitoring of all surfaces, and TeleVue's stringent made-in-the-USA telescope assembly and quality control, insure uniformly excellent results with every telescope, and a level of manufacturer-direct service that's all too rare.\u003c\/p\u003e\n\u003cp\u003eWhether you are interested in terrestrial nature studies, astronomical rich-field or planetary observing, or photography of the earth and skies, just put in an optional star diagonal and eyepiece or attach a camera and the TeleVue NP101is will satisfy your observing desires right out of its case.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Telescope's Optical and Mechanical Systems . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNagler-Petzval apochromatic refractor optics:\u003c\/strong\u003e 4\" (101mm) aperture, 540mm focal length, f\/5.4 apochromatic four-element air-spaced optical system. ED (Extra-low Dispersion) glass elements in both the front and rear doublets of the system provide images that are free from spurious color and other optical aberrations.\u003c\/p\u003e\n\u003cp\u003eThe newly-redesigned optics feature a field-flattening rear lens group that is larger than that in the original - and still available - NP101. The larger second optics group minimizes vignetting in photographic formats having up to a 50mm diagonal. In addition, for CCD cameras using a detector chip with a 35mm or larger diagonal, an optional large field corrector is available so that the stars in the newly brightened non-vignetted corners of the image are virtually as tightly-focused and sharp as those in the center of the field. \u003c\/p\u003e\n\u003cp\u003eThe new front lens cell is made of stainless steel. This provides better thermal stability in extremes of heat and cold and when taking your scope from a warm house outdoors to observe on a cold winter's night.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMulticoated optics:\u003c\/strong\u003e Fully coated on all surfaces with multiple layers of antireflection materials for high light transmission and good contrast.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDual-speed rack and pinion focuser:\u003c\/strong\u003e The newly-designed focuser has a non-vignetting internally-tapered drawtube with a 3\" entrance aperture and a 2.4\" exit aperture. This tapered design prevents any restriction of the larger converging light cone from the scope's larger field-flattening rear lens group. The drawtube terminates in an end ring that has a tilt capability to correct for any residual focal plane tilt. This is particularly important with the more stringent focus requirements of CCD cameras. Four lock knobs on the end ring hold the supplied 2\" accessory adapters firmly in place with no possibility of tilting under the weight of camera or accessories. The end ring also accepts a \"position stop\" for an optional digital micrometer that allows repeatable focus measurements with a 0.0001\" accuracy.\u003c\/p\u003e\n\u003cp\u003eThe imaging adapter is threaded to accept TeleVue's new Imaging System accessories - including large diameter extension tubes, optical accessories, and camera and CCD attachments, all with mating threads. The separate visual adapter has a 2\" non-marring brass clamp ring with two lock knobs to hold a 2\" star diagonal or other visual accessories firmly in place.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFine focus system:\u003c\/strong\u003e The focuser is equipped with a Focusmate 10:1 reduction ratio dual-speed fine focus system on the right focus knob. This precision focuser is made for TeleVue by Starlight Instruments, makers of ultra-premium Feather Touch focusers.While the left focus knob still provides TeleVue's standard focusing speed, the Starlight Instruments Focusmate on the right knob provides extremely sensitive 10:1 ratio fine focusing for imaging. Focus changes are measurable with an optional Digital Micrometer Kit to better than 1\/10,000\" for precisely repeatable focusing. Both the standard focus and the Focusmate use large knurled focus knobs that are easy to operate, even while wearing gloves or mittens in cold weather.\u003c\/p\u003e\n\u003cp\u003eAn optional Focusmate Driver permits pushbutton electronic motor control of the focusing process. The Focusmate Driver has directional pushbuttons and adjustable speed. A tap on a pushbutton permits vibration-free focusing in steps as small as approximately 0.0005\". The Focusmate Driver can be remotely computer controlled with software under development.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOptional photographic accessories:\u003c\/strong\u003e Optional photo accessories include the following: a Digital Indicator Kit for digital readout of the focuser position for repeatable focus points; a Focusmate Driver electronic vari-speed motor control for the Focusmate fine focus mechanism; a Large Field Corrector for optimized edge performance with large diagonal CCD chips; extension tubes of various lengths to bring various CCD and 35mm cameras to focus; an adapter to connect the SBIG STL11000 CCD camera; an adapter to connect a standard 35mm camera using a T-Ring; an adapter to connect a Canon EOS or digital SLR using a wide mouth Canon T-Ring; and a 0.8x focal reducer for wider field imaging.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSliding captive dew shield:\u003c\/strong\u003e The new, longer retractable dew shield slows the formation of dew on the lens to extend your undisturbed observing time. The longer dew shield also improves visual and photographic contrast by shielding the lens from off-axis ambient light (the neighbor's yard light, moonlight, etc.) For transport, the retractable lens shade keeps the overall length of the optical tube to a manageable 25.5\" when it is retracted.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMounting rings:\u003c\/strong\u003e No mounting rings are supplied for the 101mm diameter optical tube. The optional TeleVue #MRS4 dual 4\" mounting ring set is designed specifically for installing the NP101is on wide variety of equatorial mounts and mounting adapters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFinderscope mounting point:\u003c\/strong\u003e No finderscope is supplied. However, dovetail accessory mounting slots for a finderscope and other accessories (such as a piggyback camera mount) are provided on the optional TeleVue #MRS4 dual mounting ring set.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCarrying case:\u003c\/strong\u003e A custom foam-fitted locking hard shell case is standard. The case has a large accessory compartment built into its lid.\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\"\u003e4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e540mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/5.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e11 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e216x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e11 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1.15 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e12.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e5 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\u003cul\u003e\n\u003cli\u003eLens shade\u003c\/li\u003e\n\u003cli\u003eDust cover\u003c\/li\u003e\n\u003cli\u003eHard case\u003c\/li\u003e\n\u003cli\u003eVisual adapter ring\u003c\/li\u003e\n\u003cli\u003eImaging adapter ring\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":40221659988041,"sku":"NP101is","price":4267.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/NPI-4057_TVNP101is_ly_v2copy.jpg?v=1723745850"},{"product_id":"np127is-5-f-5-2-nagler-petzval-apochromatic-refractor","title":"TeleVue NP127Is 5\" f\/5.2 Nagler-Petzval Apochromatic Refractor","description":"\u003cp\u003eThe original \u003cem\u003eHot Product \u003c\/em\u003eTeleVue NP-127is has long been regarded as one of the finest optical systems available for both visual observing and imaging, and this new upgraded version is even better . . .\u003c\/p\u003e\n\u003cdiv class=\"heading\"\u003e\u003cstrong\u003eThis updated and improved TeleVue refractor optical tube has:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e• 127mm f\/5.2 four-element Nagler-Petzval apochromatic optical system \u003cbr\u003e• stainless steel front cell for improved thermal stability \u003cbr\u003e• 2.4\" rack and pinion focuser with 2\" accessory adapter \u003cbr\u003e• Focusmate 10:1 ratio dual-speed fine focus made by Starlight Instruments \u003cbr\u003e• longer retractable dew shield for improved contrast \u003cbr\u003e• state-of-the-art visual and imaging capabilities \u003cbr\u003e• 5-year warranty\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003eThe TeleVue NP127is (Imaging System) refractor sets even higher optical and mechanical quality standards for the serious observer and celestial imager than the original Hot Product version that so impressed Sky \u0026amp; Telescope in 2007. TeleVue first reinterpreted the incredible design flexibility of the Petzval portrait lens into an astronomical objective over 20 years ago. They've been refining the design ever since. No other optical design affords the same freedom to simultaneously correct for coma, astigmatism, field curvature, secondary spectrum, spherical aberration, and spherochromatism that the Nagler-Petzval design provides.\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003eThis four-element air-spaced Nagler-Petzval system has a 127mm aperture ED doublet at the front of the scope, with a second field-flattening\/aberration-correcting ED doublet at the rear. The newly-designed optical system delivers smaller spot sizes over a broader wavelength range than previously, while a new stainless steel front cell helps provide better thermal stability in extreme climates and temperature conditions.\u003c\/p\u003e\n\u003cp\u003eThe artful combination of materials and optical design gives the TeleVue NP127is diffraction-limited performance into the furthest reaches of the visual spectrum. In addition to exceptional visual performance, both inside the solar system and beyond, it has been optimized for deep space imaging, particularly with CCD cameras having large format detector chips with diagonals up to 52mm across. Every optical and mechanical element has been optimized to work as a single integrated unit, with new features to make imaging easier and more flexible.\u003c\/p\u003e\n\u003cp\u003eFor visual use, the scope's 660mm focal length is long enough, using a 1.25\" TeleVue 2.5mm Nagler eyepiece, to provide 264x for high magnification observations of the Moon, planets, and binary stars; yet it will also produce a huge 3.6° field at 21x, using a 2\" TeleVue 31mm Nagler eyepiece for wide field observing.\u003c\/p\u003e\n\u003cp\u003eIts quality, easy set-up, and airline portability beckons your use. Manufacturing advances in lens finishing, including interferometric monitoring of all surfaces, and TeleVue's stringent made-in-the-USA telescope assembly and quality control, insure uniformly excellent results with every telescope, and a level of manufacturer-direct service that's all too rare.\u003c\/p\u003e\n\u003cp\u003eWhether you are interested in terrestrial nature studies, astronomical rich-field or planetary observing, or photography of the earth and skies, just put in an optional star diagonal and eyepiece or attach a camera and the TeleVue NP127is is ready to satisfy your observing desires right out of its case.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Telescope's Optical and Mechanical Systems . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNagler-Petzval apochromatic refractor optics:\u003c\/strong\u003e 5\" (127mm) aperture, 660mm focal length, f\/5.2 apochromatic four-element air-spaced optical system. ED (Extra-low Dispersion) glass elements in both the front and rear doublets of the system provide images that are free from spurious color and other optical aberrations.\u003c\/p\u003e\n\u003cp\u003eThe optics feature a field-flattening rear lens group that is larger than that in the previous version of the NP127. This minimizes vignetting in photographic formats having up to a 50mm diagonal. In addition, for CCD cameras using a detector chip with a 35mm or larger diagonal, an optional large field corrector is available so that the stars in the newly brightened non-vignetted corners of the image are virtually as tightly-focused and sharp as those in the center of the field. \u003cbr\u003eThe new front lens cell is made of stainless steel. This provides better thermal stability in extremes of heat and cold and when taking your scope from a warm house outdoors to observe on a cold winter's night.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMulticoated optics:\u003c\/strong\u003e Fully coated on all surfaces with multiple layers of antireflection materials for high light transmission and good contrast.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDual-speed rack and pinion focuser:\u003c\/strong\u003e The newly-designed focuser has a non-vignetting internally-tapered drawtube with a 3\" entrance aperture and a 2.4\" exit aperture. This tapered design prevents any restriction of the larger converging light cone from the scope's larger field-flattening rear lens group. The drawtube terminates in an end ring that has a tilt capability to correct for any residual focal plane tilt. This is particularly important with the more stringent focus requirements of CCD cameras. The end ring also accepts a \"position stop\" for an optional digital micrometer that allows repeatable focus measurements with a 0.0001\" accuracy.\u003c\/p\u003e\n\u003cp\u003eThe new focuser's draw tube also permits quick change from visual observing to astrophotography using separate supplied visual and imaging adapters. It allows full camera rotation without focus change, and without the need to buy a separate camera angle adjuster as some other scopes require. To maintain squareness to the optical axis while changing camera orientation, the draw tube has four lock knobs that tighten against a taper on the supplied imaging adapter and 2\" visual accessory holder.\u003c\/p\u003e\n\u003cp\u003eThe imaging adapter is threaded to accept TeleVue's new Imaging System accessories - including large diameter extension tubes, optical accessories, and camera and CCD attachments, all with mating threads. The separate visual adapter has a 2\" non-marring brass clamp ring with two lock knobs to hold a 2\" star diagonal or other visual accessories firmly in place.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFine focus system:\u003c\/strong\u003e The focuser is equipped with a renowned Starlight Instruments Feather Touch 10:1 reduction ratio micro-focus system on the right focus knob. While the left focus knob still provides TeleVue's standard focusing speed, the Feather Touch micro-focuser on the right knob provides extremely sensitive fine focus adjustment for imaging. Focus changes are measurable with an optional Digital Micrometer Kit to better than 1\/10,000\" for precisely repeatable focusing. Both the standard focus and the Focusmate use large knurled focus knobs that are easy to operate, even while wearing gloves or mittens in cold weather.\u003c\/p\u003e\n\u003cp\u003eAn optional Focusmate Driver (#TVFDF2004) permits pushbutton electronic motor control of the focusing process. The Focusmate Driver has directional pushbuttons and adjustable speed. A tap on a pushbutton permits vibration-free focusing in steps as small as approximately 0.0005\". The Focusmate Driver can be remotely computer controlled with software under development. The #TVFDF2004 is designed only for the new Feather Touch focuser version of the NP127is, serial number 1175 and above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOptional photographic accessories:\u003c\/strong\u003e Optional photo accessories include the following: a Large Field Corrector for optimized edge performance with large diagonal CCD chips; extension tubes of various lengths to bring various CCD and 35mm cameras to focus; an adapter to connect the SBIG STL11000 CCD camera; an adapter to connect a standard 35mm camera using a T-Ring; an adapter to connect a Canon EOS or digital SLR using a wide mouth Canon T-Ring; a 1.5x extender to increase the focal length and focal ratio for lunar and planetart imaging; and a 0.8x focal reducer for even wider field deep space imaging.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSliding captive dew shield:\u003c\/strong\u003e The new, longer retractable dew shield slows the formation of dew on the lens to extend your undisturbed observing time. The longer dew shield also improves visual and photographic contrast by shielding the lens from off-axis ambient light (the neighbor's yard light, moonlight, etc.) For transport, the retractable lens shade keeps the overall length of the optical tube to a manageable 33\" when it is retracted.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMounting rings:\u003c\/strong\u003e No mounting rings are supplied for the 127mm diameter optical tube. The optional TeleVue #MRS5 dual 5\" mounting ring set is designed specifically for installing the NP127is on wide variety of equatorial mounts and mounting adapters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFinderscope mounting point:\u003c\/strong\u003e No finderscope is supplied. However, dovetail accessory mounting slots for a finderscope and other accessories (such as a piggyback camera mount) are provided on the optional TeleVue #MRS5 dual mounting ring set.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCarrying case:\u003c\/strong\u003e A custom foam-fitted locking hard shell case is standard. The case has a large accessory compartment built into its lid.\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\"\u003e5\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e660mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/5.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e16 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e264x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLunar Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eFair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.91 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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e5 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003eSupplied Accessories: \u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eLens shade\u003c\/li\u003e\n\u003cli\u003eDust cover\u003c\/li\u003e\n\u003cli\u003eHard case\u003c\/li\u003e\n\u003cli\u003eVisual adapter ring\u003c\/li\u003e\n\u003cli\u003eImaging adapter ring\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":40221660020809,"sku":"NP127is","price":7373.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/NPI-4057_TVNP101is_ly_v2copy_4d26dd18-dc20-4872-b061-1e05823718d8.jpg?v=1723746188"},{"product_id":"6-sct-optical-tube-cg5-avx-dovetail","title":"Celestron 6\" SCT Optical Tube, CG5\/AVX Dovetail","description":"\u003cp\u003eThis 6\" SCT optical tube has advanced Starbright XLT multicoatings for Celestron's brightest images ever.\u003c\/p\u003e\n\u003cp\u003eThe Celestron C8 was the first Schmidt-Cassegrain telescope available to amateur astronomers. This 6\" f\/10 Celestron optical tube is the direct, but much improved, descendent of that original astronomical triumph. For many people, the 6\" aperture of this optical tube is a little like Goldilocks and the Three Bears - it's not too big, it's not too small, it's just right! The rugged aluminum optical tube is only 16\" long and weighs only 9 lbs., making it easy to transport and set up. An optional focal reducer (#8325) is available to bring the focal ratio down to a fast f\/6.3 for CCD and 35mm photography.\u003c\/p\u003e\n\u003cp\u003eAdvanced StarBright XLT multicoatings are standard equipment. This coatings package includes high reflectivity multilayer aluminum mirrors enhanced with titanium dioxide for high reflectivity, plus a unique combination of magnesium fluoride and hafnium dioxide antireflection coatings on both sides of the Schmidt corrector lens. The corrector lens itself is made of high transmission water white float glass instead of conventional soda lime glass (which has 3.5% lower transmission) used in other telescopes.\u003c\/p\u003e\n\u003cp\u003eStarBright XLT multicoatings visibly increase the contrast on subtle lunar, planetary, and nebula details when compared with a scope with standard multicoatings. They also give you higher light transmission for brighter deep space images and shorter exposure times during CCD and 35mm photography. Across the total visual\/photographic spectrum from 400nm to 750nm, independent laboratory tests show the new Starbright XLT coatings are 16% brighter overall than even the original industry-standard Starbright multicoatings.\u003c\/p\u003e\n\u003cp\u003eThe optical tube comes with a 6 x 30mm straight-through achromatic finderscope and mounting bracket. The finder has a wide 7° field of view. It focuses by loosening the trim ring behind the objective lens cell, screwing the lens cell in or out to focus, and tightening the trim ring to lock in the correct focus. Also included is a removable 1.25\" visual back that holds visual and photographic accessories such as a star diagonal, tele-extender, etc. A 1.25\" prism type star diagonal is also standard, as is a 1.25\" 25mm Plössl eyepiece. This eyepiece provides a magnification of 60x, with a 0.83° field that's two-thirds wider than the full Moon.\u003c\/p\u003e\n\u003cp\u003eA 1.75\" wide dovetail slide bar runs the length of the tube for mounting the optical tube on a Celestron AVX or any German equatorial mount that has a Vixen style saddle plate. Optional split mounting rings are also available to put the tube on another mount of the buyer's choosing. Dust covers for the optics complete the supplied accessories.\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\"\u003e6\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1500mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e9 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e300x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e9 lbs.\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\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40221660741705,"sku":"C6SOTA","price":879.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/91010-xlt_xlt_6_sct_2.jpg?v=1662967624"},{"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":"takahashi-fsq-85ed-baby-q-3-35-f-5-3-dual-ed-four-element-design","title":"Takahashi FSQ-85EDX \"Baby Q\" 3.35\" F\/5.3 Dual ED\/Four Element Design","description":"\u003cp\u003eThe new Takahashi FSQ-85ED (the \"Baby Q\") apochromatic ED quadruplet is a clear leader in the ranks of relatively small aperture refractors. Its four-element double ED element modified Petzval optical system has been optimized for imaging as well as visual applications. It is measurably the best no-compromise portable photo-visual refractor under 102mm in aperture that Takahashi has ever built, and they've built a lot of \u003cem\u003every \u003c\/em\u003egood small scopes over the years.\u003c\/p\u003e\n\u003cp\u003eThe FSQ-85ED is a 3.35\" aperture f\/5.3 (450mm focal length) four-lens photo\/visual system using two ED (Extra-low Dispersion) glass elements. Based on the classic two-doublet Petzval design, the FSQ-85ED takes full advantage of the latest exotic glass types to produce levels of correction for coma, astigmatism, field curvature, secondary spectrum, spherical aberration, and spherochromatism that are unsurpassed - even better than their legendary fluorite scopes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Telescope's Optical System . . . \u003c\/strong\u003e\u003c\/p\u003e\n\u003cblockquote\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eApochromatic modified Petzval refractor optical system: \u003c\/strong\u003e3.35\" aperture f\/5.3 (450mm focal length) four-lens fully-multicoated system using two ED (Extra-low Dispersion) glass elements. The modified Petzval design uses a true apochromatic doublet objective lens with an ED element to gather the light. For most telescope manufacturers, this would be enough. But Takahashi goes a step further to perfect your observing and imaging experience. There is a second widely air-spaced ED doublet buried deep within the telescope body. This second doublet optimizes the optical wavefront from the objective lens to eliminate any residual astigmatism. It also acts as a field flattener for wide field astrophotography. The result is a very wide and flat field with high contrast images that are without any hint of lateral color. Color correction has been extended to 1000nm, well into the infrared, to produce non-bloated photographic star images\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge Image Circle: \u003c\/strong\u003eAt prime focus the 44mm image circle covers a huge area of the sky measuring 5.6° in diameter, over 24 square degrees of sky. The large image circle will fully cover any 35mm negative or 35mm equivalent CCD chip (a 35mm negative and the largest currently available SBIG Research Series chip measure only 44mm across their diagonals). Light fall-off at the edges of the field is minor and easily compensated for in a CCD image by a simple flat field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong Back Focus: \u003c\/strong\u003eThe very generous back focus of 200mm allows the user to attach a variety of imaging packages, binoviewers, 2\" star diagonals, and many other visual devices. The 200mm back focus has been designed to handle the ever-larger image trains of CCD imaging experts - electric focusers or temperature compensated focusers, flip mirror systems, filter wheels, adaptive optics systems, etc.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/blockquote\u003e\n\u003cp\u003e\u003cstrong\u003eThis Telescope's Mechanical System . . . \u003c\/strong\u003e\u003c\/p\u003e\n\u003cblockquote\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact Optical Tube: \u003c\/strong\u003eThe all-aluminum 95mm diameter scope body is finished in ivory, with Takahashi green and black trim, and is very solidly built. The tube length of only 12.7\" with the dew shield retracted and no visual accessories attached makes the \"Baby Q\" highly airline-transportable. The FSQ-85ED uses a special optional \u003ca href=\"\/takahashi-tube-holder-with-offset-plate-for-fsq-85ed-baby-q-refractor_p16487.aspx\"\u003e#85TH tube holder with offset plate\u003c\/a\u003e designed specifically to mount this scope on an equatorial mount and balance it properly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocuser: \u003c\/strong\u003eThe focuser is an 80mm (3.15\") rack-and-pinion design whose drawtube terminates in a 2\" eyepiece\/accessory holder. A 1.25\" compression ring eyepiece\/star diagonal adapter fits into the extension tube to hold 1.25\" accessories and is held in place by the extension tube's thumbscrews. The scope should reach visual focus with most 2\" star diagonals. Straight-through viewing and 1.25\" diagonal use will require adding optional eyepiece extension tube #TET0002, at $69.95. The focuser has a silky-smooth motion and oversize knobs that make it easy to achieve sharp focus, even at very high powers. The right focuser knob has a smaller separate concentric knob that controls a 10:1 ratio Micro Edge fine focuser for critical high magnification and photographic focusing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera angle adjuster: \u003c\/strong\u003eThe focuser includes a built-in camera angle adjuster\/rotator that will carry a 5kg (11 lb.) load to handle the weight of the new large chip CCD cameras and their associated accessories. The camera angle rotation is controlled by a large hand-tighten knob on the top of the focuser drawtube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinderscope: \u003c\/strong\u003eNo finderscope is supplied. There is a flat boss on the upper left side of the focuser that will accept an optional Takahashi finder bracket and finderscope. An optional 6 x 30mm Takahashi finderscope is shown in the feature images below.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDew shield: \u003c\/strong\u003eThe optical tube has a retractable self-storing dew shield. A thumbscrew locks the dew shield in place, either when extended or when retracted. The dew shield serves the dual purpose of retarding the formation of dew during long observing sessions and improving the photo\/visual contrast, much as a camera lens shade does.\u003c\/li\u003e\n\u003c\/ul\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\"\u003e3.35\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e450mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/5.3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e180x\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\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1.36 arc seconds\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\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e12.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e5 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/blockquote\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":40221664280649,"sku":"FSQ85","price":4280.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/16492.jpg?v=1662967729"},{"product_id":"explore-scientific-es80-80mm-f-6-ed-essential-series-fcd-1-ed-apo-triplet-refractor","title":"Explore Scientific ES80 80mm f\/6 ED \"Essential Series\" FCD-1 ED APO Triplet Refractor","description":"\u003cp\u003eThis 80mm Explore Scientific \"Essential Series\" ED triplet apochromatic refractor is loaded with features and is priced hundreds of dollars less than many competitive 80mm triplet scopes - and even less than many competitive doublets . . .\u003c\/p\u003e\n\u003cdiv class=\"heading\"\u003e\u003cstrong\u003eThis Explore Scientific ES80 \"Essential Series\" refractor has:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e\n\u003cul\u003e\n\u003cli\u003e80mm f\/6 fully multicoated triplet optics using a Hoya FCD-1 FPL51-equivalent ED element\u003c\/li\u003e\n\u003cli\u003eDual-speed 2\" Crayford focuser with 10:1 ratio fine focusing\u003c\/li\u003e\n\u003cli\u003e2\" dielectric star diagonal with 2\" and 1.25\" brass compression ring eyepiece holders\u003c\/li\u003e\n\u003cli\u003eVixen-style dovetail mounting foot\u003c\/li\u003e\n\u003cli\u003ePre-mounted base for finderscope (finder not included)\u003c\/li\u003e\n\u003cli\u003eExtended lifetime warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003eThe Explore Scientific ES80 \"Essential Series\" refractor uses a premium Hoya FCD-1 ED glass element and state-of-the-art optical multicoatings in its apochromatic air-spaced ED triplet optics. The result is images that are essentially free of the annoying halo of unfocused violet light (chromatic aberration) that mars the view of bright stars and solar system objects in lesser scopes, despite the fast focal ratio of the ES80, and even at very high magnifications.\u003c\/p\u003e\n\u003cp\u003eAt only 5.95 lbs, the Explore Scientific ES80 is a natural as a lightweight grab-and-go scope for spur-of-the-moment backyard astronomy. It also makes a top-notch travel scope to take across town or around the world. In addition, it's a nifty fast focal ratio astrograph to piggyback on a larger scope for serious wide field imaging, or you can even use it on a big altazimuth or equatorial mount as the heart of your observing system.\u003c\/p\u003e\n\u003cp\u003eConsidering its surprisingly low price for an apochromatic triplet, and in view of the great optical performance that comes as standard equipment, the 80mm Explore Scientific ES80 is a terrific buy!\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures of this telescope . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAir-spaced ED apochromatic triplet refractor optics:\u003c\/strong\u003e 80mm (3.1\") aperture, 480mm focal length, f\/6 focal ratio three-lens air-spaced optical system. The optics use a center lens element of Hoya FCD1 (Dense Fluor Crown) glass, the Hoya equivalent of FPL-51 ED (Extra-low Dispersion) glass. This ED element produces superior sharpness and color correction by minimizing the chromatic aberration, the \"false\" color fringing seen around bright objects when light rays pass through standard crown-and-flint doublet objectives. The result is to reduce spurious color halos and fringing to vanishingly low levels.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFully multicoated optics:\u003c\/strong\u003e The ES80 triplet objective lens has EMD™ (Enhanced Multilayer Deposition) 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\u003eInternal light baffles:\u003c\/strong\u003e The aluminum tube has contrast-enhancing internal light baffles and a specially darkened tube interior to provide dark sky backgrounds and high terrestrial contrast.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCollimatable optics:\u003c\/strong\u003e One of the bonuses of owning a refractor is that, compared to standard reflector telescopes, they almost never require realigning of the optics (collimation). However, any air-spaced refractor telescope may require optical recentering if the lens elements are knocked out of alignment by a heavy blow during shipping or use. Removing the dew shield will give you access to the lens centering screws in the sides of the lens cell, which you can then adjust yourself by referring to the supplied instructions. You can also send your scope to Explore Scientific's Service Center for precision alignment. A standard service charge applies for factory realignment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDew shield:\u003c\/strong\u003e The supplied removable 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. A single thumbscrew holds the dew shield in place, allowing the felt-lined dew shield to be removed from the scope, reversed, slid back onto the optical tube, and stored for transport in only a few seconds. The optical tube measures a compact 18.5\" long, including the dew shield. A thread-in metal dust cap for the optical tube is standard.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDual speed 2\" rack and pinion focuser:\u003c\/strong\u003e The precision-made no-backlash 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 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.\u003c\/p\u003e\n\u003cp\u003eThe focuser drawtube has a scale marked in centimeters and 1mm increments. This lets you note individual focuser positions for easy return to the correct focus when switching between visual use and photography. Two knobs underneath the focuser lets you adjust the tension on the drawtube to accommodate varying eyepiece\/photo accessory loads, as well as firmly lock in a photographic focus. The focuser has a non-marring 2\" brass compression ring equipment holder.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e2\" dielectric star diagonal and compression ring eyepiece holders:\u003c\/strong\u003e The supplied standard equipment 2\" mirror star diagonal of the ES80CF slips into the focuser drawtube's 2\" eyepiece\/accessory holder. The 2\" diagonal has 99% reflectivity dielectric mirror coatings for high light transmission. The star diagonal uses a non-marring soft brass compression ring to hold 2\" eyepieces in place. The compression ring won't scratch the barrel of your 2\" eyepieces as an ordinary thumbscrew can.\u003c\/p\u003e\n\u003cp\u003eA supplied 1.25\" accessory adapter slips into the 2\" diagonal to let you use 1.25\" eyepieces in the 2\" diagonal. The 1.25\" accessory adapter can also be inserted into the 2\" accessory holder on the focuser drawtube to let you use a 1.25\" image erecting diagonal, or 1.25\" photographic accessories. Like the 2\" eyepiece holder on the diagonal, the 1.25\" adapter also uses a non-marring soft brass compression ring to hold 1.25\" star diagonals and accessories in place.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMounting foot:\u003c\/strong\u003e For serious astronomy and astrophotography, the ES80 has an L-shaped dovetail mounting foot that is shaped to fit directly into the Vixen-style dovetail slot on the head of many of the most popular light to medium capacity altazimuth mounts and Celestron VX Series go-to German equatorials, among others. In addition, the dovetail has both 1\/4\"-20 and 3\/8\" holes that allow you to mount the 7.5 pound scope (when including diagonal) directly onto any good photo tripod for casual astronomy or daytime terrestrial observing. A knob on the body of the scope allows you to rotate the tube assembly and focuser to line up a camera in either a landscape or portrait orientation (or any orientation in between), then temporarily lock the focuser in that position.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExtended lifetime warranty:\u003c\/strong\u003e This individually serial numbered Explore Scientific telescope is backed by a limited one year warranty, which will be extended to an Explore Scientific transferable Extended Life of the Product limited warranty when its warranty card is registered with Explore Scientific within 60 days of purchase.\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\"\u003e3.1\"\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\"\u003e480mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGalaxy and Nebula Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eFair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e160x\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\"\u003e7.5 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\"\u003e1.45 arc seconds\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\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\"\u003e1 year, extendable to lifetime\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\u003eVixen-style dovetail mount\u003c\/li\u003e\n\u003cli\u003eRotating 2\" dual speed rack and pinion focuser\u003c\/li\u003e\n\u003cli\u003eMounting shoe for optional finderscope\u003c\/li\u003e\n\u003cli\u003eDust covers.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":40221666934857,"sku":"ES80B","price":699.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/DSC09061_1390x1390_acc879c8-1beb-4165-85a7-b582ecff1f79.webp?v=1722357401"},{"product_id":"explore-scientific-es127-127mm-f-7-5-essential-series-fcd-1-ed-triplet-refractor","title":"Explore Scientific ES127 127mm f\/7.5 \"Essential Series\" FCD-1 ED Triplet Refractor","description":"\u003cp\u003eThis big 127mm (5\") Explore Scientific \u003cem\u003eEssential Series\u003c\/em\u003e air-spaced ED triplet apochromatic refractor is loaded with quality optical performance at a surprisingly reasonable price for a scope of its size and optical quality . . .\u003c\/p\u003e\n\u003cdiv class=\"heading\"\u003e\u003cstrong\u003eThis 5\" Explore Scientific ES127 \"Essential Series\" apochromatic refractor has:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e\n\u003cul\u003e\n\u003cli\u003e127mm f\/7.5 fully multicoated triplet optics using a Hoya FPL51-equivalent ED element\u003c\/li\u003e\n\u003cli\u003eDual-speed 2\" rack and pinion focuser with 10:1 ratio fine focusing\u003c\/li\u003e\n\u003cli\u003eMounting rings with dovetail for use on a Vixen-style altazimuth or German equatorial mount\u003c\/li\u003e\n\u003cli\u003eFinderscope base installed on OTA\u003c\/li\u003e\n\u003cli\u003eExtended product lifetime warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003eWith a 5\" (127mm) aperture, this Explore Scientific \"Essentials Series\" ES127 ED triplet refractor gathers 55% more light (with nearly 25% higher resolution) than the more common size 102mm (4\") doublet and triplet refractors that often cost nearly as much as the ES127.\u003c\/p\u003e\n\u003cp\u003eThe Explore Scientific ES127 uses a premium Hoya ED glass element and state-of-the-art optical multicoatings in its apochromatic air-spaced ED triplet optics. The result is images that are essentially free of the annoying halo of unfocused violet light (chromatic aberration) that mars the view of bright stars and solar system objects in lesser scopes, despite the scope's relatively large aperture, and even at very high magnifications.\u003c\/p\u003e\n\u003cp\u003eThe Explore Scientific ES127 is a natural on an equatorial mount as the heart of your primary observing system. In addition, it's an excellent astrograph for serious wide field imaging, as well as crisp solar system imaging. Considering its surprisingly reasonable price for a 5\" apochromatic triplet and in view of the great optical performance that comes as standard equipment, the 5\" Explore Scientific ES127 is a terrific buy!\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures of this Telescope . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eED triplet refractor optics:\u003c\/strong\u003e 127mm (5\") aperture, 952mm focal length, f\/7.5 focal ratio three-lens air-spaced optical system. The optics use a center lens element of Hoya FCD1 (Dense Fluor Crown) glass, the Hoya equivalent of FPL-51 ED (Extra-low Dispersion) glass. This ED element produces superior sharpness and color correction by minimizing the chromatic aberration, the \"false\" color fringing seen around bright objects when light rays pass through standard crown-and-flint doublet objectives, particularly those with apertures in the ES127 class. The result is to reduce spurious color halos and fringing to vanishingly low levels.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFully multicoated optics:\u003c\/strong\u003e The ES127 triplet objective lens has EMD™ (Enhanced Multilayer Deposition) 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\u003eInternal light baffles:\u003c\/strong\u003e The aluminum tube body has contrast-enhancing internal light baffles and a specially darkened tube interior to provide dark sky backgrounds and high contrast.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCollimatable optics:\u003c\/strong\u003e One of the bonuses of owning a refractor is that, compared to standard reflector telescopes, they almost never require realigning of the optics (collimation). However, any air-spaced refractor telescope may require optical recentering if the lens elements are knocked out of alignment by a heavy blow during shipping or use. Removing the dew shield will give you access to the lens centering screws in the sides of the lens cell, which you can then adjust yourself by referring to the supplied instructions. You can also send your scope to Explore Scientific's Service Center for precision alignment. A standard service charge applies for factory realignment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDew shield:\u003c\/strong\u003e The supplied 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 a neighbor's backyard security light. A slip-on metal dust cap is standard.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDual speed 2\" rack and pinion focuser:\u003c\/strong\u003e The rotating precision-made no-backlash 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 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.\u003c\/p\u003e\n\u003cp\u003eThe focuser drawtube has a scale marked in centimeters and 1mm increments. This lets you note individual focuser positions for easy return to the correct focus when switching between visual use and photography. Lock knobs let you adjust the tension on the drawtube to accommodate varying eyepiece\/photo accessory loads, as well as firmly lock in a photographic focus. The focuser terminates in a non-marring 2\" compression ring accessory holder. Two 2\" draw tube extensions are included to let adjust the back focus when using a diagonal and eyepieces versus a camera.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMounting rings and dovetail:\u003c\/strong\u003e The ES127 has dual split mounting rings with a dovetail plate that fits the Vixen-style dovetail slot on the head of many of the most popular medium capacity German equatorial mounts. Such mounts include Celestron and iOptron go-to mounts, among others. A spacer\/stabilizing bar on the top of the rings provides a carrying handle that makes it easy to transport the optical tube and install it on your equatorial mount. There is a mounting shoe for an optional finderscope installed on the body of the scope.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExtended lifetime warranty:\u003c\/strong\u003e This individually serial numbered Explore Scientific telescope is backed by a limited one year warranty, which will be extended to an Explore Scientific transferable Life of The Product limited warranty when its warranty card is registered with Explore Scientific within 60 days of purchase. Full details on this unique transferable lifetime warranty.\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\"\u003e5\"\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\"\u003e952mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/7.5\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\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e271x\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\"\u003e22 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\"\u003e0.91 arc seconds\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\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1 year, extendable to lifetime\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\u003eDual tube rings with Vixen-style dovetail\u003c\/li\u003e\n\u003cli\u003e2\" dual speed rack and pinion focuser\u003c\/li\u003e\n\u003cli\u003eRetractable dew shield\u003c\/li\u003e\n\u003cli\u003eDust covers\u003c\/li\u003e\n\u003cli\u003eFinderscope base\u003c\/li\u003e\n\u003cli\u003e2\" 99% reflective dielectric star diagonal\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":40221667950665,"sku":"ES127B","price":1499.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/17670.jpg?v=1722357305"},{"product_id":"celestron-11-edgehd-optical-tube-cge-losmandy-dovetail","title":"Celestron 11\" EdgeHD Optical Tube, CGE\/Losmandy Dovetail","description":"\u003cp\u003eThe \u003cem\u003eEdgeHD \u003c\/em\u003ehigh definition flat field optics of this Celestron 11\" EdgeHD optical tube give you a true astrographic-quality big aperture 11\" optical tube at a surprisingly affordable price . . .\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThis Celestron 11\" EdgeHD optical tube 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• 11\" EdgeHD Faster-compatible high definition aplanatic Schmidt-Cassegrain optics \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• StarBright XLT optical multicoatings for the highest possible light transmission\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• mirror locks and cooling vents \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• 9 x 50mm finderscope in quick-release bracket\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• 2\" star diagonal \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• 23mm 2\" Luminos 82° field eyepiece (122x) \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• CGE (Losmandy-style \"D-plate\") dovetail \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• 2-year warranty\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe Celestron 11\" EdgeHD optical tube has new and unique big aperture 11\" aperture aplanatic (free from coma and corrected for spherical aberration) EdgeHD high definition\/high contrast Schmidt optics. The advanced EdgeHD optical system uses a dedicated dual-element field flattener lens made from premium Schott optical glass in its central baffle tube to reduce off-axis coma and produce aberration-free images across a wide 42mm image circle (as large as the diagonal of a 35mm negative or large format CCD chip and ideal for astrophotography). And those images look superb through the supplied ultra-premium 23mm 2\" Celestron Axiom 82° field eyepiece.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eIn addition to reduced off-axis coma, the EdgeHD optics deliver an astrograph-quality focal plane more than three times flatter than standard Schmidt-Cassegrains and dramatically flatter than competing coma-free designs. Stars are smaller and more concentrated, creating brighter images and allowing you to see down to a fainter magnitude than other equally-sized telescopes. With EdgeHD optics, you see sharp point-like stars to the very edges of some of the largest CCD and DSLR chips available today.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eFor the ultimate in brightness and contrast, the 11\" EdgeHD optical tube has state-of-the-art Starbright XLT multicoatings. Its light grasp is almost 1600 times that of even the sharpest dark-adapted eye, revealing to your eye and camera star clusters, nebulas, planets, and galaxies in amazing detail. The Fastar-compatible optical tube even allows imaging down to an incredibly-fast f\/2 focal ratio using optional accessories.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThis Celestron Optical Tube's Optics . . .\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\u003eEdgeHD aplanatic Schmidt-Cassegrain optics:\u003c\/strong\u003e 11\" aperture (2800mm focal length f\/10). Guaranteed diffraction-limited optical performance, free from coma and corrected for spherical aberrations (aplanatic design). Dual-element field flattener lens built into central baffle tube. The 24\" long aluminum optical tube has a large handle on the rear cell and weighs only 27.5 pounds, making it easy to transport and assemble the optical tube to a mount in the field.  The support tab above has more infomration about the revolutionary EdgeHD optics.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eStarbright XLT fully multicoated optics:\u003c\/strong\u003e This high transmission\/high reflectivity optical coatings package applied to each optical surface gives you visibly higher light transmission for brighter deep space images and shorter exposure times during imaging. It also increases the contrast on subtle lunar, planetary, and nebula details when compared with optics using ordinary coatings or multicoatings. For more details, click on the \"Starbright XLT\" link in the support tab above.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eFastar compatible:\u003c\/strong\u003e For the ultimate in wide-field catadioptric imaging, the EdgeHD optical tube is Fastar compatible to allow CCD imaging at a blazingly-fast f\/2 focal ratio. For f\/2 imaging, an optional Fastar lens assembly lens replaces the scope's removable secondary mirror (an exchange that takes only a few minutes). Your CCD camera is attached to the Fastar lens. This puts your camera at the f\/2 position in the center of the Schmidt corrector lens at the front of the optical tube, rather than in its normal f\/10 position at the Cassegrain focus at the rear. The Fastar option is for imaging only and cannot be used for visual observing.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThis Celestron Optical Tube's Mechanics . . .\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\u003eFocusing:\u003c\/strong\u003e Focusing is accomplished by turning a knob on the rear cell that moves the primary mirror fore and aft along the central baffle tube to adjust the focus. The Celestron focusing mechanism is supported by two pre-loaded ball bearings, minimizing the \"mirror flop\" typical of bushing-type focus mechanisms that causes image shift during critical focusing.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eMirror locks:\u003c\/strong\u003e Flexible tension locks hold the mirror in place after correct focus is achieved for imaging and reduce image shift when rotating the tube around a mount (when moving past the zenith during astrophotography, for example). Unlike other designs that have only one locking knob located off to one side of the mirror, the Celestron system uses three locks equally spaced around the mirror to distribute the mirror locking force symmetrically.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe focuser itself acts as one of the locks, while two flexible rods spaced 120° away in either direction act as the second and third locks. Controlled by variable tension knobs on the rear cell, these rods act in conjunction with the focuser to hold the mirror in place without putting any asymmetrical force or pressure on the mirror. This keeps the image centered in the eyepiece (or chip) no matter what the orientation of the optical tube.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eTube vents:\u003c\/strong\u003e Two cooling vents on the rear cell allow warm air to be released from behind the primary mirror when the scope is taken out for a night's observing or imaging. This shortens the amount of time needed for the optics to cool down to ambient air temperature for peak performance. Each vent has an integrated 60 micron micro-mesh filter guaranteed to let warm air out without letting dust in.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eDovetail rail:\u003c\/strong\u003e The full length dovetail rail mounted under the optical tube fits Celestron CGEM, CGE, CGX, CGX-L, and CGE Pro mounts, as well as any other make or model German equatorial mount that uses a Losmandy-style \"D-plate\" mounting dovetail slot.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThis Celestron Optical Tube's Supplied Accessories . . .\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\u003eFinderscope:\u003c\/strong\u003e The supplied 9 x 50mm straight-through achromatic design finderscope has a wide 5.8 degree field of view. It is mounted in a spring-loaded easy-adjust quick release bracket.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eStar diagonal:\u003c\/strong\u003e The supplied star diagonal is a 2\" first-surface mirror type. Also included is a 1.25\" visual back for using 1.25\" accessories.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eEyepiece:\u003c\/strong\u003e The standard equipment eyepiece is a premium-quality 2\" 23mm 82° field Luminos (122x). The eyepiece field of view is 0.67° wide, over a third larger than the full moon, and an exceptionally wide field for the optical tubes 122x magnification.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eTwo-year warranty:\u003c\/strong\u003e All Celestron optical tubes have a two-year warranty.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/77dLKd5g2_M\"\u003e\u003c\/iframe\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\"\u003e2800mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e440x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e27.5 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.42 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e14.7\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\u003cul\u003e\n\u003cli\u003eStarbright XLT fully multicoated 11\" f\/10 Fastar-compatible EdgeHD optics\u003c\/li\u003e\n\u003cli\u003e9 x 50mm finderscope\u003c\/li\u003e\n\u003cli\u003e2\" star diagonal with 1.25\" eyepiece holder\u003c\/li\u003e\n\u003cli\u003e2\" 23mm Axiom 82° field eyepiece (122x)\u003c\/li\u003e\n\u003cli\u003eDust covers\u003c\/li\u003e\n\u003cli\u003eCGE (Losmandy-style \"D-plate\") dovetail mounting rail.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40221668311113,"sku":"C11HDOTA","price":3999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/17732.jpg?v=1662967847"},{"product_id":"celestron-8-edgehd-optical-tube-cge-losmandy-dovertail","title":"Celestron 8\" EdgeHD Optical Tube, CGE\/Losmandy Dovetail","description":"\u003cp\u003eThe \u003cem\u003eEdgeHD \u003c\/em\u003ehigh definition flat field optics of this Celestron 8\" EdgeHD optical tube make true astrographic-quality 8\" optics truly affordable.\u003c\/p\u003e\n\u003cdiv class=\"heading\"\u003e\u003cstrong\u003eThis Celestron EdgeHD 8 optical tube has:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e• 8\" EdgeHD Faster-compatible high definition aplanatic Schmidt-Cassegrain optics \u003cbr\u003e• StarBright XLT optical multicoatings for the highest possible light transmission\u003cbr\u003e• mirror locks and cooling vents \u003cbr\u003e• 9 x 50mm finderscope in quick-release bracket\u003cbr\u003e• 1.25\" star diagonal \u003cbr\u003e• 40mm 1.25\" Plössl eyepiece (51x) \u003cbr\u003e• CGE (Losmandy-style \"D-plate\") dovetail \u003cbr\u003e• 2-year warranty\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003eThe compact and easily transportable Celestron 8\" EdgeHD optical tube has new and unique 8\" aperture aplanatic (free from coma and corrected for spherical aberration) EdgeHD high definition\/high contrast Schmidt optics. The advanced EdgeHD optical system uses a dedicated dual-element field flattener lens made from premium Schott optical glass in its central baffle tube to reduce off-axis coma and produce aberration-free images across a wide 42mm image circle (as large as the diagonal of a 35mm negative or large format CCD chip and ideal for astrophotography).\u003c\/p\u003e\n\u003cp\u003eIn addition to reduced off-axis coma, the EdgeHD optics deliver an astrograph-quality focal plane more than three times flatter than standard Schmidt-Cassegrains and dramatically flatter than competing coma-free designs. Stars are smaller and more concentrated, creating brighter images and allowing you to see down to a fainter magnitude than other equally-sized telescopes. With EdgeHD optics, you see sharp point-like stars to the very edges of some of the largest CCD and DSLR chips available today.\u003c\/p\u003e\n\u003cp\u003eFor the ultimate in brightness and contrast, the 8\" EdgeHD optical tube has state-of-the-art Starbright XLT multicoatings. Its light grasp is almost 850 times that of even the sharpest dark-adapted eye, revealing to your eye and camera star clusters, nebulas, planets, and galaxies in amazing detail. The Fastar-compatible optical tube even allows imaging down to an incredibly-fast f\/2 focal ratio using optional accessories.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Celestron Optical Tube's Optics . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEdgeHD aplanatic Schmidt-Cassegrain optics:\u003c\/strong\u003e 8\" aperture (2032mm focal length f\/10). Guaranteed diffraction-limited optical performance, free from coma and corrected for spherical aberrations (aplanatic design). Dual-element field flattener lens built into central baffle tube. The 17\" long aluminum optical tube has a large handle on the rear cell and weighs only 14 pounds, making it easy to transport and assemble the optical tube to a mount in the field. For more details, click on the \"EdgeHD optics\" link in the support tab above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStarbright XLT fully multicoated optics:\u003c\/strong\u003e This high transmission\/high reflectivity optical coatings package applied to each optical surface gives you visibly higher light transmission for brighter deep space images and shorter exposure times during imaging. It also increases the contrast on subtle lunar, planetary, and nebula details when compared with optics using ordinary coatings or multicoatings. For more details, click on the \"Starbright XLT\" link in the support tab above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFastar compatible:\u003c\/strong\u003e For the ultimate in wide-field catadioptric imaging, the EdgeHD optical tube is Fastar compatible to allow CCD imaging at a blazingly-fast f\/2 focal ratio. For f\/2 imaging, an optional Fastar lens assembly lens replaces the scope's removable secondary mirror (an exchange that takes only a few minutes). Your CCD camera is attached to the Fastar lens. This puts your camera at the f\/2 position in the center of the Schmidt corrector lens at the front of the optical tube, rather than in its normal f\/10 position at the Cassegrain focus at the rear. The Fastar option is for imaging only and cannot be used for visual observing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Celestron Optical Tube's Mechanics . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFocusing:\u003c\/strong\u003e Focusing is accomplished by turning a knob on the rear cell that moves the primary mirror fore and aft along the central baffle tube to adjust the focus. The Celestron focusing mechanism is supported by two pre-loaded ball bearings, minimizing the \"mirror flop\" typical of bushing-type focus mechanisms that causes image shift during critical focusing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMirror locks:\u003c\/strong\u003e Flexible tension locks hold the mirror in place after correct focus is achieved for imaging and reduce image shift when rotating the tube around a mount (when moving past the zenith during astrophotography, for example). Unlike other designs that have only one locking knob located off to one side of the mirror, the Celestron system uses three locks equally spaced around the mirror to distribute the mirror locking force symmetrically.\u003c\/p\u003e\n\u003cp\u003eThe focuser itself acts as one of the locks, while two flexible rods spaced 120° away in either direction act as the second and third locks. Controlled by variable tension knobs on the rear cell, these rods act in conjunction with the focuser to hold the mirror in place without putting any asymmetrical force or pressure on the mirror. This keeps the image centered in the eyepiece (or chip) no matter what the orientation of the optical tube.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTube vents:\u003c\/strong\u003e Two cooling vents on the rear cell allow warm air to be released from behind the primary mirror when the scope is taken out for a night's observing or imaging. This shortens the amount of time needed for the optics to cool down to ambient air temperature for peak performance. Each vent has an integrated 60 micron micro-mesh filter guaranteed to let warm air out without letting dust in.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDovetail rail:\u003c\/strong\u003e The full length dovetail rail mounted under the optical tube fits Celestron CGEM, CGE, and CGE Pro mounts, as well as any other make or model German equatorial mount that uses a Losmandy-style \"D-plate\" mounting dovetail slot.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Celestron Optical Tube's Supplied Accessories . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFinderscope:\u003c\/strong\u003e The supplied 9 x 50mm straight-through achromatic design finderscope has a wide 5.8 degree field of view. It is mounted in a spring-loaded easy-adjust quick release bracket.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStar diagonal:\u003c\/strong\u003e The supplied star diagonal is a 1.25\" prism type. Also included is a 1.25\" visual back.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEyepiece:\u003c\/strong\u003e The standard equipment eyepiece is a 1.25\" 40mm Plössl (51x). The eyepiece field of view is 0.84 degrees, almost 70% larger than the full Moon.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTwo-year warranty:\u003c\/strong\u003e All Celestron optical tubes have a two-year warranty.\u003c\/p\u003e\n\u003cp\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/77dLKd5g2_M\" height=\"315\" width=\"560\"\u003e\u003c\/iframe\u003e\u003c\/p\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\"\u003e2032mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e405x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e14 lbs.\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\"\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\u003cul\u003e\n\u003cli\u003eStarbright XLT fully multicoated 8\" f\/10 Fastar-compatible EdgeHD optics\u003c\/li\u003e\n\u003cli\u003e9 x 50mm finderscope\u003c\/li\u003e\n\u003cli\u003e1.25\" star diagonal with 1.25\" visual back\u003c\/li\u003e\n\u003cli\u003e1.25\" 40mm Plössl eyepiece (51x)\u003c\/li\u003e\n\u003cli\u003eDust covers\u003c\/li\u003e\n\u003cli\u003eCGE (Losmandy-style \"D-plate\") dovetail mounting rail.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40221668376649,"sku":"C8HDOTA","price":1499.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/17733.jpg?v=1662967849"},{"product_id":"celestron-9-25-edgehd-optical-tube-cge-losmandy-dovetail","title":"Celestron 9.25\" EdgeHD Optical Tube, CGE\/Losmandy Dovetail","description":"\u003cp\u003eThe \u003cem\u003eEdgeHD \u003c\/em\u003ehigh definition flat field optics of this Celestron 9.25\" EdgeHD optical tube give you true astrographic-quality 9.25\" optics with a definite edge over other reduced coma optical systems . . .\u003c\/p\u003e\n\u003cdiv class=\"heading\"\u003e\u003cstrong\u003eThis Celestron EdgeHD 9.25 optical tube 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• 9.25\" EdgeHD Faster-compatible high definition aplanatic Schmidt-Cassegrain optics \u003cbr\u003e• StarBright XLT optical multicoatings for the highest possible light transmission\u003cbr\u003e• mirror locks and cooling vents \u003cbr\u003e• 9 x 50mm finderscope in quick-release bracket\u003cbr\u003e• 2\" star diagonal \u003cbr\u003e• ultra-premium 23mm 82° field 2\" Axiom eyepiece (102x) \u003cbr\u003e• CGE (Losmandy-style \"D-plate\") dovetail \u003cbr\u003e• 2-year warranty\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e\u003c\/div\u003e\n\u003cp\u003eThe compact and easily transportable Celestron 9.25\" EdgeHD optical tube has new and unique 9.25\" aperture aplanatic (free from coma and corrected for spherical aberration) EdgeHD high definition\/high contrast Schmidt optics. The advanced EdgeHD optical system uses a dedicated dual-element field flattener lens made from premium Schott optical glass in its central baffle tube to reduce off-axis coma and produce aberration-free images across a wide 42mm image circle (as large as the diagonal of a 35mm negative or large format CCD chip and ideal for astrophotography).\u003c\/p\u003e\n\u003cp\u003eIn addition to reduced off-axis coma, the EdgeHD optics deliver an astrograph-quality focal plane more than three times flatter than standard Schmidt-Cassegrains and dramatically flatter than competing coma-free designs. Stars are smaller and more concentrated, creating brighter images and allowing you to see down to a fainter magnitude than other equally-sized telescopes. With EdgeHD optics, you see sharp point-like stars to the very edges of some of the largest CCD and DSLR chips available today.\u003c\/p\u003e\n\u003cp\u003eFor the ultimate in brightness and contrast, the 9.25\" EdgeHD optical tube has state-of-the-art Starbright XLT multicoatings. Its light grasp is more than 1100 times that of even the sharpest dark-adapted eye, revealing to your eye and camera star clusters, nebulas, planets, and galaxies in amazing detail. The Fastar-compatible optical tube even allows imaging down to an incredibly-fast f\/2 focal ratio using optional accessories.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Celestron Optical Tube's Optics . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEdgeHD aplanatic Schmidt-Cassegrain optics:\u003c\/strong\u003e 9.25\" aperture (2350mm focal length f\/10). Guaranteed diffraction-limited optical performance, free from coma and corrected for spherical aberrations (aplanatic design). Dual-element field flattener lens built into central baffle tube. The 22\" long aluminum optical tube has a large handle on the rear cell and weighs only 20 pounds, making it easy to transport and assemble the optical tube to a mount in the field. For more details, click on the \"EdgeHD optics\" link in the support tab above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStarbright XLT fully multicoated optics:\u003c\/strong\u003e This high transmission\/high reflectivity optical coatings package applied to each optical surface gives you visibly higher light transmission for brighter deep space images and shorter exposure times during imaging. It also increases the contrast on subtle lunar, planetary, and nebula details when compared with optics using ordinary coatings or multicoatings. For more details, click on the \"Starbright XLT\" link in the support tab above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFastar compatible:\u003c\/strong\u003e For the ultimate in wide-field catadioptric imaging, the EdgeHD optical tube is Fastar compatible to allow CCD imaging at a blazingly-fast f\/2 focal ratio. For f\/2 imaging, an optional Fastar lens assembly lens replaces the scope's removable secondary mirror (an exchange that takes only a few minutes). Your CCD camera is attached to the Fastar lens. This puts your camera at the f\/2 position in the center of the Schmidt corrector lens at the front of the optical tube, rather than in its normal f\/10 position at the Cassegrain focus at the rear. The Fastar option is for imaging only and cannot be used for visual observing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Celestron Optical Tube's Mechanics . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFocusing:\u003c\/strong\u003e Focusing is accomplished by turning a knob on the rear cell that moves the primary mirror fore and aft along the central baffle tube to adjust the focus. The Celestron focusing mechanism is supported by two pre-loaded ball bearings, minimizing the \"mirror flop\" typical of bushing-type focus mechanisms that causes image shift during critical focusing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMirror locks:\u003c\/strong\u003e Flexible tension locks hold the mirror in place after correct focus is achieved for imaging and reduce image shift when rotating the tube around a mount (when moving past the zenith during astrophotography, for example). Unlike other designs that have only one locking knob located off to one side of the mirror, the Celestron system uses three locks equally spaced around the mirror to distribute the mirror locking force symmetrically.\u003c\/p\u003e\n\u003cp\u003eThe focuser itself acts as one of the locks, while two flexible rods spaced 120° away in either direction act as the second and third locks. Controlled by variable tension knobs on the rear cell, these rods act in conjunction with the focuser to hold the mirror in place without putting any asymmetrical force or pressure on the mirror. This keeps the image centered in the eyepiece (or chip) no matter what the orientation of the optical tube.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTube vents:\u003c\/strong\u003e Two cooling vents on the rear cell allow warm air to be released from behind the primary mirror when the scope is taken out for a night's observing or imaging. This shortens the amount of time needed for the optics to cool down to ambient air temperature for peak performance. Each vent has an integrated 60 micron micro-mesh filter guaranteed to let warm air out without letting dust in.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDovetail rail:\u003c\/strong\u003e The full length dovetail rail mounted under the optical tube fits Celestron CGEM, CGE, and CGE Pro mounts, as well as any other make or model German equatorial mount that uses a Losmandy-style \"D-plate\" mounting dovetail slot.\u003cbr\u003eThis Celestron Optical Tube's Supplied Accessories . . .\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFinderscope:\u003c\/strong\u003e The supplied 9 x 50mm straight-through achromatic design finderscope has a wide 5.8 degree field of view. It is mounted in a spring-loaded easy-adjust quick release bracket.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStar diagonal:\u003c\/strong\u003e The supplied star diagonal is a 2\" first surface mirror. Also included is a 1.25\" visual back.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEyepiece:\u003c\/strong\u003e The standard equipment eyepiece is a premium 2\" 23mm 82° field Axiom (102x). The eyepiece field of view is 0.8° wide, over 50% larger than the full Moon, and an exceptionally wide field for the 102x magnification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTwo-year warranty:\u003c\/strong\u003e All Celestron optical tubes have a two-year warranty.\u003c\/p\u003e\n\u003cp\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/77dLKd5g2_M\" frameborder=\"0\" allow=\"autoplay; encrypted-media\" allowfullscreen=\"\"\u003e\u003c\/iframe\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\"\u003e9.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2350mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e470x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e20 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.49 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e14.4\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\u003cul\u003e\n\u003cli\u003eStarbright XLT fully multicoated 9.25\" f\/10 Fastar-compatible EdgeHD optics\u003c\/li\u003e\n\u003cli\u003e9 x 50mm finderscope\u003c\/li\u003e\n\u003cli\u003e2\" star diagonal with 1.25\" visual back\u003c\/li\u003e\n\u003cli\u003e2\" 23mm Axiom eyepiece (102x)\u003c\/li\u003e\n\u003cli\u003eDust covers\u003c\/li\u003e\n\u003cli\u003eCGE (Losmandy-style \"D-plate\") dovetail mounting rail.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40221668409417,"sku":"C9HDOTA","price":2799.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/91040-xlt_cge_pro_925_hd_2.jpg?v=1662967851"},{"product_id":"celestron-14-edgehd-optical-tube-cge-losmandy-dovetail","title":"Celestron 14\" EdgeHD Optical Tube, CGE\/Losmandy Dovetail","description":"\u003cp\u003eThe Fastar-compatible \u003cem\u003eEdgeHD \u003c\/em\u003ehigh definition flat field optics of this big, big Celestron 14\" EdgeHD optical tube give you true astrographic-quality performance in a scope with enough aperture to keep you happily viewing and imaging for the rest of your life.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Celestron 14\" EdgeHD optical tube has:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"heading\"\u003e• 14\" EdgeHD Faster-compatible high definition aplanatic Schmidt-Cassegrain optics \u003cbr\u003e• StarBright XLT optical multicoatings for the highest possible light transmission\u003cbr\u003e• mirror locks and cooling vents \u003cbr\u003e• 9 x 50mm finderscope in quick-release bracket\u003cbr\u003e• 2\" star diagonal \u003cbr\u003e• 23mm 2\" Luminos 82° field eyepiece (170x) \u003cbr\u003e• CGX-L (Losmandy-style \"D-plate\") dovetail \u003cbr\u003e• 2-year warranty\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e\u003cspan style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 0.875rem;\"\u003e \u003c\/span\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 0.875rem;\"\u003eThe Celestron 14\" EdgeHD optical tube has new, unique, and very big aperture 14\" aperture aplanatic (free from coma and corrected for spherical aberration) EdgeHD high definition\/high contrast Schmidt optics. The advanced EdgeHD optical system uses a dedicated dual-element field flattener lens made from premium Schott optical glass in its central baffle tube to reduce off-axis coma and produce aberration-free images across a wide 42mm image circle (as large as the diagonal of a 35mm negative or large format CCD chip and ideal for astrophotography). And those images look superb through the supplied ultra-premium 23mm 2\" Celestron Axiom 82° field eyepiece.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eIn addition to reduced off-axis coma, the EdgeHD optics deliver an astrograph-quality focal plane more than three times flatter than standard Schmidt-Cassegrains and dramatically flatter than competing coma-free designs. Stars are smaller and more concentrated, creating brighter images and allowing you to see down to a fainter magnitude than other equally-sized telescopes. With EdgeHD optics, you see sharp point-like stars to the very edges of some of the largest CCD and DSLR chips available today.\u003c\/p\u003e\n\u003cp\u003eFor the ultimate in brightness and contrast, the 14\" EdgeHD optical tube has state-of-the-art Starbright XLT multicoatings. Its 14\" aperture has a light grasp that's nearly 2600 times that of even the sharpest dark-adapted eye (36% greater than a 12\" telescope and almost twice that of a 10\" scope). With an effective light-gathering power equal to that many eyes, the EdgeHD optics of this 14\" EdgeHD optical tube can reveal to you faint deep space objects in amazing and subtle detail. The Fastar-compatible optical tube even allows imaging down to an incredibly-fast f\/2 focal ratio using optional accessories.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Celestron Optical Tube's Optics . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEdgeHD aplanatic Schmidt-Cassegrain optics:\u003c\/strong\u003e 14\" aperture (3910mm focal length f\/11). Guaranteed diffraction-limited optical performance, free from coma and corrected for spherical aberrations (aplanatic design). Dual-element field flattener lens built into central baffle tube. The 31\" long aluminum optical tube has a large handle on the rear cell and weighs a stout 45 pounds, making the use of a high payload capacity German equatorial mount mandatory. For more details, click on the \"EdgeHD optics\" link in the support tab above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStarbright XLT fully multicoated optics:\u003c\/strong\u003e This high transmission\/high reflectivity optical coatings package applied to each optical surface gives you visibly higher light transmission for brighter deep space images and shorter exposure times during imaging. It also increases the contrast on subtle lunar, planetary, and nebula details when compared with optics using ordinary coatings or multicoatings. For more details, click on the \"Starbright XLT\" link in the support tab above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFastar compatible:\u003c\/strong\u003e For the ultimate in wide-field catadioptric imaging, the EdgeHD optical tube is Fastar compatible to allow CCD imaging at a blazingly-fast f\/2 focal ratio. For f\/2 imaging, an optional Fastar lens assembly lens replaces the scope's removable secondary mirror (an exchange that takes only a few minutes). Your CCD camera is attached to the Fastar lens. This puts your camera at the f\/2 position in the center of the Schmidt corrector lens at the front of the optical tube, rather than in its normal f\/11 position at the Cassegrain focus at the rear. The Fastar option is for imaging only and cannot be used for visual observing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Celestron Optical Tube's Mechanics . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFocusing:\u003c\/strong\u003e Focusing is accomplished by turning a knob on the rear cell that moves the primary mirror fore and aft along the central baffle tube to adjust the focus. The Celestron focusing mechanism is supported by two pre-loaded ball bearings, minimizing the \"mirror flop\" typical of bushing-type focus mechanisms that causes image shift during critical focusing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMirror locks:\u003c\/strong\u003e Flexible tension locks hold the mirror in place after correct focus is achieved for imaging and reduce image shift when rotating the tube around a mount (when moving past the zenith during astrophotography, for example). Unlike other designs that have only one locking knob located off to one side of the mirror, the Celestron system uses three locks equally spaced around the mirror to distribute the mirror locking force symmetrically, important with a mirror as large and heavy as this 14\".\u003c\/p\u003e\n\u003cp\u003eThe focuser itself acts as one of the locks, while two flexible rods spaced 120° away in either direction act as the second and third locks. Controlled by variable tension knobs on the rear cell, these rods act in conjunction with the focuser to hold the mirror in place without putting any asymmetrical force or pressure on the mirror. This keeps the image centered in the eyepiece (or chip) no matter what the orientation of the optical tube.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTube vents:\u003c\/strong\u003e Two cooling vents on the rear cell allow warm air to be released from behind the primary mirror when the scope is taken out for a night's observing or imaging. This shortens the amount of time needed for the optics to cool down to ambient air temperature for peak performance. Each vent has an integrated 60 micron micro-mesh filter guaranteed to let warm air out without letting dust in.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDovetail rail:\u003c\/strong\u003e The full length dovetail rail mounted under the optical tube fits Celestron CGX-L mounts, as well as any other high payload capacity German equatorial mount that uses a Losmandy-style \"D-plate\" dovetail mounting slot.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Celestron Optical Tube's Supplied Accessories . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFinderscope:\u003c\/strong\u003e The supplied 9 x 50mm straight-through achromatic design finderscope has a wide 5.8 degree field of view. It is mounted in a spring-loaded easy-adjust quick release bracket.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStar diagonal:\u003c\/strong\u003e 2\" first-surface mirror type, with a 1.25\" visual back to use 1.25\" accessories.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEyepiece:\u003c\/strong\u003e The standard equipment eyepiece is a premium 2\" 23mm 82° field Luminous (170x). The eyepiece field of view is 0.48° wide, almost as wide as the full Moon, and an exceptionally wide field for the 170x magnification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTwo-year warranty:\u003c\/strong\u003e All Celestron optical tubes have a two-year warranty.\u003c\/p\u003e\n\u003cp\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/77dLKd5g2_M\"\u003e\u003c\/iframe\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\"\u003e14\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e3910mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/11\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e46 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e650x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e46 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.32 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e15.3\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\u003e\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e\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\u003eStarbright XLT fully multicoated 14\" f\/11 Fastar-compatible EdgeHD optics\u003c\/li\u003e\n\u003cli\u003e9 x 50mm finderscope\u003c\/li\u003e\n\u003cli\u003e2\" star diagonal with 1.25\" visual back\u003c\/li\u003e\n\u003cli\u003e2\" 23mm Axiom eyepiece (170x)\u003c\/li\u003e\n\u003cli\u003eDust covers\u003c\/li\u003e\n\u003cli\u003eCGE (Losmandy-style \"D-plate\") dovetail mounting rail.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40221668442185,"sku":"C14HDOTA","price":6899.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/91060-xlt_cge_pro_1400_hd_1.jpg?v=1662967852"},{"product_id":"astro-tech-10-f-8-ritchey-chretien-optical-tube","title":"Astro-Tech 10\" f\/8 Ritchey-Chrétien Optical Tube","description":"\u003cp\u003eThe 10\" Astro-Tech AT10RC Ritchey-Chrétien astrograph is a \u003cem\u003eSky \u0026amp; Telescope \u003cstrong\u003e\u003cspan style=\"font-size: 15px; font-family: verdana; color: #990000;\"\u003eHot Product for 2010\u003c\/span\u003e\u003c\/strong\u003e\u003c\/em\u003e and an \u003cstrong\u003e\u003cem\u003eAstronomy \u003cspan style=\"font-size: 15px; font-family: verdana; color: #990000;\"\u003eStar Product for 2010\u003c\/span\u003e \u003c\/em\u003e\u003c\/strong\u003eaward winner. The AT10RC is the \u003cem\u003efirst \u003c\/em\u003etruly affordable large aperture true Ritchey-Chrétien astrograph available from a U. S. company. Imitators will copy Astro-Tech's years of work, but why settle for a copy when you can get the original?\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eDeveloped by Astro-Tech to make large-format CCD imaging affordable for the amateur astronomer, the Astro-Tech AT10RC - a Sky \u0026amp; Telescope Hot Product for 2010 - is priced nearly $4000 less than the formerly least-expensive 10\" R-C. The AT10RC is the first truly affordable large aperture true Ritchey-Chrétien astrograph available from a U. S. company. Even better, despite its low price, the Astro-Tech-developed AT10RC has many of the same premium features as the high-priced competitive RCs.\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 AT10RC 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• 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• 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• nine 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 3\" linear bearing Crayford focuser\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• 1.25\" and 2\" 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• 1\" and 2\" focuser extension rings to fine-tune the back focus\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• two Losmandy-style \"D-plate\" dovetail rails \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• mounting bracket for optional finder\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 result of several years of Astro-Tech's joint development with the manufacturer, the Astro-Tech 10\" f\/8 AT10RC Ritchey-Chrétien is the first truly affordable large aperture true Ritchey-Chrétien astrograph available from a U. S. company. Imitators have copied Astro-Tech's years of hard development work, but why settle for a copy when you can get the original? Sky \u0026amp; Telescope agrees, as they named the Astro-Tech AT10RC a Sky \u0026amp; Telescope Hot Product for 2010, along with its smaller 8\" brother, the Astro-Tech AT8RC. (Incidentally, the original Astro-Tech 6\" R-C was named a Sky \u0026amp; Telescope Hot product for 2009.)\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 AT10RC a Star Product for 2010, saying \"it offers premium features . . . a superb photographic telescope . . . Astronomy Technologies breaks the price barrier with affordable Ritchey-Chrétiens.\"\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The affordable Astro-Tech AT10RC joins two other Astro-Tech Ritchey-Chrétien firsts. One is the AT8RC, also a Sky \u0026amp; Telescope Hot Product for 2010 - the first 8\" true Ritchey-Chrétien astrograph available from a U. S. company and the first and still the only affordable U. S. 8\" R-C with Astro-Tech-designed premium features like quartz mirrors, dielectric mirror coatings, two dovetail mounting rails, and more. The other is the AT6RC - a highly affordable R-C astrograph for DSI and DSLR imaging that was conceived and developed by, and first brought to market by, Astro-Tech and named a Hot Product for 2009. Both the AT6RC and the AT8RC were highly praised in a four-page review in the December 2009 issue of Sky \u0026amp; Telescope magazine.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eAnd we are serious when we say the 10\" aperture AT10RC is \"affordable.\" The Astro-Tech AT10RC is priced nearly $4000 less than the formerly least-expensive 10\" R-C. As Sky \u0026amp; Telescope pointed out in their Hot Product citation in the January 2010 Sky \u0026amp; Telescope, \"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 last month's issue (December 2009), page 38, and our initial hands-on look at the 10-inch suggests that it will be equally exciting for deep sky astrophotographers.\" The magazine also pointed out that the AT10RC cost \"about one-fourth what similar instruments did just a couple of years ago.\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003c\/span\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 The Astro-Tech AT10RC 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 large format CCD astrophotographer at a price less than that of many large format CCD cameras. Featuring first-quality 99% reflectivity dielectric mirror coatings and premium low thermal expansion quartz mirrors, this economical 10\" Astro-Tech R-C makes you wonder just what competitive high-price R-Cs have that makes them cost so much more.\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 AT10RC provides the wide coma-free photographic field that large format CCD astrophotographers crave, but can't get from conventional reflectors and Schmidt-Cassegrains. Likewise, as a pure two-mirror system, the AT10RC 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 10\" 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 AT10RC photos of the Eagle and Trifid Nebulas are from AT10RC prototype owner John O'Neill. They were taken with an SBIG ST-10XME CCD camera and Astrodon filters.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eJohn had this to say about the AT10RC, \"Finally got a full data image of an old favorite, The Trifid Nebula. Total of 1.5 hours of data on a 7 out of 10 night here in Florida. The scope is truly everything I expected and more. This shot was compared to one taken with a 24\" RC (taken the same night) and you would be hard pressed to tell the difference. The guy that had the 24\" was actually a little miffed that a $3,000 scope could do as well as his $75,000 scope :\u0026gt;)\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eAnother good example of why that high-end 24\" R-C owner might be miffed is Brian Kimball's exceptional image of NGC2244. This open cluster of young stars is nestled within the Rosette Nebula, and was recently formed from that nebula's material. Brian's image easily stands up to a side by side comparison with photos taken by professional observatories using much larger and more expensive telescopes, as well as to those taken with the most expensive amateur astrographs.\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 10\" S \u0026amp; T Hot Product for 2010 Astro-Tech AT10RC 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\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eFeatures of this Astro-Tech AT10RC 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 235mm 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, rather than the Pyrex used by competitors. 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 AT10RC primary mirror is fixed to eliminate both a catadioptric's image shift and 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;\"\u003e\u003cstrong\u003eHyperboloid secondary mirror:\u003c\/strong\u003e Made of low thermal expansion quartz, rather than the Pyrex used by competitors. Ground and polished under precision computer control. 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 AT10RC 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 The December 2009 issue of 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\u003c\/span\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eRolled steel optical tube:\u003c\/strong\u003e The optical tube is made of thin rolled steel for strength, with die-cast and machined front and rear cells. In addition to its strength, the thermal expansion characteristics of steel are quite low, much closer to carbon fiber than to aluminum. In most environments, this results in fewer focus changes due to the optical tube contracting as the temperature drops during an imaging session than you need with an aluminum body scope. For areas where extreme temperature swings are the norm, a very low thermal expansion carbon fiber body version of the AT10RC (the AT10RCF) is available to still further lessen the need for adjusting the focus over the course of an imaging session.\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. Nine contrast-enhancing glare-stop knife-edge baffles in the optical tube; multiple glare-stop microbaffles in the secondary mirror light shield; and baffles in the primary mirror baffle tube to 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 3.3\" linear bearing Crayford focuser:\u003c\/strong\u003e A newly-designed extra-sturdy \"linear bearing\" Crayford focuser is threaded onto the rear cell of the AT10RC. A locking collar allows the entire precision-made non-vignetting focuser to be rotated to the most convenient imaging angle and locked in place. There is 140mm (5.5\") of back focus available with the focuser installed (235mm from the rear cell of the scope, without focuser, to the focal plane).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The 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. 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;\"\u003eTo fine-tune the long back focus of the AT10RC to the requirements of your camera and equipment train, three threaded extension rings (two 1\" in length and one 2\") are provided to install singly or in combination between the AT10RC 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. The two 6.4 ounce 1\" extension rings and the 14.4 ounce 2\" ring add 1.7 pounds to the weight of the scope when all rings are installed.\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\u003eFocusing scale:\u003c\/strong\u003e The focuser's 50mm (1.97\") travel drawtube has scales marked in both 1\/16th inch and 1mm increments so you can note individual focuser positions for easy return to the approximate correct focus when switching between varying photographic equipment combinations.\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 AT10RC 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\u003e1.25\" and 2\" compression ring accessory holders:\u003c\/strong\u003e The 3.25\" o.d. focuser drawtube ends in a stepdown to 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. Two thumbscrews are provided to lock the compression ring on your accessories. 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 Losmandy-style \"D-plate\" dovetail rails are provided for installing the AT10RC on an equatorial mount, as well as for mounting optional accessories (such as rings for a photoguide scope) on top. The 21\" long dovetail rails run the length of the optical tube. One is mounted underneath the tube for installing the 34.4 pound AT10RC directly on a suitable payload capacity Losmandy-style equatorial mount. The second dovetail rail is mounted 180° away from the first, on 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 Losmandy-style \"D-plate\" dovetail adapters. The undersides of the dovetails have been hollowed out to lighten their weight without compromising their strength, as can be seen in the side-view feature image below.\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\"\u003e10\"\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\"\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\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\"\u003e34.4 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\"\u003e0.46 arc seconds\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\"\u003e9.25 (235mm) from rear cell, 5 (127mm) with 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\u003cmeta charset=\"UTF-8\"\u003e\u003cstrong\u003e• three built-in cooling fans in rear cell \u003cbr\u003e• 1.25\" and 2\" compression ring accessory holders \u003cbr\u003e• 1\" and 2\" focuser extension rings to fine-tune the back focus\u003cbr\u003e• two Losmandy-style \"D-plate\" dovetail rails \u003cbr\u003e• mounting bracket for optional finder \u003c\/strong\u003e\u003c\/p\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40221668507721,"sku":"AT10RC","price":2495.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/17788.jpg?v=1662967854"},{"product_id":"astro-tech-10-f-8-ritchey-chretien-carbon-fiber-optical-tube","title":"Astro-Tech 10\" f\/8 Ritchey-Chrétien Carbon Fiber Optical Tube","description":"\u003cp\u003eAfter many customer requests, we are proud to now offer the Astro-Tech AT10RC Ritchey-Chrétien astrograph, a \u003cem\u003eSky and Telescope Hot Product for 2010, \u003c\/em\u003ewith a premium low thermal expansion carbon fiber body. The AT10RC is the first truly affordable large aperture true Ritchey-Chrétien astrograph available from a U. S. company, and is priced thousands of dollars less than competitive 10\" RCs.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eDeveloped by Astro-Tech to make large-format CCD imaging affordable for the amateur astronomer, the Astro-Tech AT10RCF - a Sky \u0026amp; Telescope Hot Product for 2010 - is priced thousands of dollars less than the formerly least-expensive 10\" R-C. The Astro-Tech AT10RCF is the first truly affordable large aperture true Ritchey-Chrétien astrograph available from a U. S. company. Even better, despite its low price, the Astro-Tech-developed AT10RCF has many of the same premium features as the much higher-priced competitive RCs (and some they don't have) - like quartz mirrors, carbon fiber body, and more.\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 AT10RCF 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• 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• 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• center spotted secondary mirror \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 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• nine 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• shipped without focuser to allow you to add the premium focuser of your choice \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• 1\" and 2\" focuser extension rings to fine-tune the back focus of your optional focuser \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• two Losmandy-style \"D-plate\" dovetail rails \u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e• mounting bracket for optional finder\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe 10\" Astro-Tech AT10RCF is the first truly affordable carbon fiber large aperture true Ritchey-Chrétien astrograph available from a U. S. company. Imitators will no doubt copy Astro-Tech's years of hard development work, but why settle for a copy when you can get the original? Sky \u0026amp; Telescope agrees, as they named the Astro-Tech 8\" and 10\" Astro-Tech Ritchey-Chrétien astrographs Sky \u0026amp; Telescope Hot Products for 2010. (Incidentally, the original Astro-Tech 6\" R-C was named a Sky \u0026amp; Telescope Hot product for 2009 and the new 12\" AT12RC has been named a Hot Product for 2011.)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eThe surprisingly affordable Astro-Tech AT10RCF (and its even more affordable metal tube brother, the AT10RC) joins two other Astro-Tech Ritchey-Chrétien firsts. One is the AT8RC, a Sky \u0026amp; Telescope Hot Product for 2010 - the first 8\" true Ritchey-Chrétien astrograph available from a U. S. company and the first and still the only affordable U. S. 8\" R-C with Astro-Tech-designed premium features like quartz mirrors, two dovetail mounting rails, and more. The other is the AT6RC - a highly affordable R-C astrograph for webcam, DSI, and DSLR imaging that was conceived and developed by, and first brought to market by, Astro-Tech and named a Hot Product for 2009. Both the AT6RC and the AT8RC were highly praised in a four-page review in the December 2009 issue of Sky \u0026amp; Telescope magazine.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eAnd we are serious when we say the 10\" aperture AT10RCF is \"affordable.\" The premium feature carbon fiber Astro-Tech AT10RCF is priced thousands of dollars less than the formerly least-expensive phenolic tube 10\" R-C. As Sky \u0026amp; Telescope pointed out in their Hot Product citation in the January 2010 Sky \u0026amp; Telescope, \"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 last month's issue (December 2009), page 38, and our initial hands-on look at the 10-inch suggests that it will be equally exciting for deep sky astrophotographers.\" The magazine also pointed out that the 10\" Astro-Tech RC cost \"about one-fourth what similar instruments did just a couple of years ago.\"\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. The Astro-Tech AT10RCF astrograph (a telescope designed specifically for astronomical imaging, rather than visual observing) makes the coma-free imaging of true Ritchey-Chrétien optics available to the DSLR and large format CCD astrophotographer at a price less than that of many large format CCD cameras and DSLR camera bodies. Featuring first-quality premium low thermal expansion quartz mirrors, rather than aluminized Pyrex glass mirrors, this economical 10\" Astro-Tech carbon fiber R-C makes you wonder just what competitive high-price R-Cs have that makes them cost so much more.\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 AT10RCF provides the coma-free photographic field that large format CCD astrophotographers crave, but can't get from conventional reflectors and Schmidt-Cassegrains. Likewise, as a pure two-mirror system, the AT10RCF 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 an 10\" 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;\"\u003eAn example of the kind of imaging possible with the AT10RCF is Brian Kimball's exceptional image of NGC2244. This open cluster of young stars is nestled within the Rosette Nebula, and was recently formed from that nebula's material. Brian's AT10RCF image easily stands up to a side by side comparison with photos taken by professional observatories using much larger and more expensive telescopes, as well as to those taken with the most expensive amateur astrographs.\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 used by most modern professional observatories and the Hubble Space Telescope for their imaging, your wait is over. The 10\" Sky \u0026amp; Telescope Hot Product for 2010 Astro-Tech AT10RCF 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\u003cstrong\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003eFeatures of this Astro-Tech AT10RCF 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 235mm 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, rather than the Pyrex used by competitors. 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 AT10RCF primary mirror is fixed to eliminate both a catadioptric's image shift and the frequent primary mirror collimation requirements of a Newtonian reflector. 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 the Pyrex used by competitors. Ground and polished under precision computer control. Mounted in a 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 AT10RCF 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 The December 2009 issue of 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\u003eMultiple internal light baffles:\u003c\/strong\u003e Computer optimized primary and secondary baffling. Nine contrast-enhancing glare-stop knife-edge baffles in the optical tube; multiple glare-stop microbaffles in the secondary mirror light shield; baffles in the primary mirror baffle tube, and baffles in the focuser drawtube, 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\u003eCarbon fiber optical tube:\u003c\/strong\u003e Made of a high strength woven carbon fiber-reinforced epoxy-coated composite with extremely low thermal expansion characteristics to reduce the possibility of temperature-related focus changes during an exposure that can occur with aluminum or rolled steel tube systems. Die-cast and machined aluminum front and rear cells. The carbon fiber tube is dent-proof and virtually indestructible. 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The December 2009 issue of Sky \u0026amp; Telescope said of the carbon fiber tube used in the 8\" Astro-Tech RC, \"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\u003eDual-speed 3.3\" linear bearing Crayford focuser:\u003c\/strong\u003e A newly-designed extra-sturdy \"linear bearing\" Crayford focuser is threaded onto the rear cell of the AT10RCF. A locking collar allows the entire precision-made non-vignetting focuser to be rotated to the most convenient imaging angle and locked in place. There is 140mm (5.5\") of back focus available with the focuser installed (235mm from the rear cell of the scope, without focuser, to the focal plane).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e The 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. 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;\"\u003eTo fine-tune the long back focus of the AT10RCF to the requirements of your camera and equipment train, three threaded extension rings (two 1\" in length and one 2\") are provided to install singly or in combination between the AT10RC 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. The two 6.4 ounce 1\" extension rings and the 14.4 ounce 2\" ring add 1.7 pounds to the weight of the scope when all rings are installed.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: medium;\"\u003e\u003cstrong\u003eOptional field flattener:\u003c\/strong\u003e For even more impressive coma-free imaging with the AT10RCF, 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\u003eCooling fans:\u003c\/strong\u003e To allow the AT10RCF 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 Losmandy-style \"D-plate\" dovetail rails are provided for installing the AT10RCF on an equatorial mount, as well as for mounting optional accessories (such as rings for a photoguide scope) on top. The 21\" long dovetail rails run the length of the optical tube. One is mounted underneath the tube for installing the 33.6 pound AT10RCF directly on a suitable payload capacity Losmandy-style equatorial mount. The second dovetail rail is mounted 180° away from the first, on 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 Losmandy-style \"D-plate\" dovetail adapters. The undersides of the dovetails have been hollowed out to lighten their weight without compromising their strength, as can be seen in the side-view feature image below.\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's rear cell. 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\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\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\"\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\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\"\u003e33.6 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\"\u003e0.46 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\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\"\u003e9.25 (235mm)\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\u003cstrong\u003e• 1\" and 2\" focuser extension rings to fine-tune the back focus of your \u003cem\u003eoptional \u003c\/em\u003efocuser \u003cbr\u003e• three built-in cooling fans in rear cell \u003cbr\u003e• two Losmandy-style \"D-plate\" dovetail rails \u003cbr\u003e• mounting bracket for optional finder \u003c\/strong\u003e\u003c\/p\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40221669130313,"sku":"AT10RCF","price":3495.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/18196.jpg?v=1662967873"},{"product_id":"takahashi-tsa-120-4-7-f-7-5-ortho-apochromat-triplet-refractor-ota","title":"Takahashi TSA-120 4.7\" F\/7.5 Ortho-Apochromat Triplet Refractor OTA","description":"\u003cp\u003eThis Takahashi TSA-120 4.72\" ED triplet refractor puts true-color \"super apochromat\" optical excellence in a portable 15.4 lb. package.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Takahashi refractor optical tube has: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e • 120mm (4.72\") f\/7.5 Ortho-Apochromat ED triplet optics \u003cbr\u003e• 2.7\" rack and pinion focuser with 1.25\" eyepiece adapter \u003cbr\u003e• retractable dew shield \u003cbr\u003e• 227.5mm of back focus for CCD and film imaging \u003cbr\u003e• state-of-the-art optical performance, exceeding even fluorite scopes\u003cbr\u003e• 5-year warranty \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e    The Takahashi TSA-120 refractor provides exceptionally high optical and mechanical quality for the serious visual observer and astrophotographer who needs portable optics. The TSA-120 is exceptional for observing and imaging within the solar system. Its images of subtle lunar and planetary details are sharp, with realistic and highly saturated color. They are free from chromatic aberration's violet haze of spurious color, thanks to the scope's ED triplet optics. The latest broadband antireflection multicoatings and numerous knife-edge internal baffles assure the maximum image contrast possible.\u003c\/p\u003e\n\u003cp\u003e This 4.72\" Takahashi has excellent light transmission and diffraction-free true color images that make it superb for deep space observing and imaging, as well. Binary stars and globular star clusters are particularly well-resolved and vivid, with the contrasting colors of many binary systems showing nicely. The brighter nebulas and galaxies stand out against a very dark sky background. \u003cbr\u003eThe f\/7.5 focal ratio and 900mm focal length of the TSA-120 are long enough, using a Takahashi 2.8mm ED eyepiece to provide 321x, for high magnification observations of the Moon and planets, yet it will also produce a huge 2.72° field at 18x, using a 2\" Takahashi 50mm eyepiece.\u003cstrong\u003e\u003c\/strong\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Telescope's Optical and Mechanical Systems . . . \u003c\/strong\u003e\u003c\/p\u003e\n\u003cblockquote\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eApochromatic triplet ED refractor optics: \u003c\/strong\u003e4.72\" (120mm) aperture, 900mm focal length, f\/7.5 Ortho-Apochromatic triplet lens using an FPL-53 ED (Extra-low Dispersion) glass element between two crown glass elements for images that are free from spurious color (chromatic aberration). \u003cspan style=\"font-family: verdana;\"\u003eFor more details, click on the \"Takahashi triplet lens\" icon above.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulticoated optics: \u003c\/strong\u003eFully coated on all surfaces with multiple layers of broadband antireflection materials for high light transmission and good contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable dew shield: \u003c\/strong\u003eSlows the formation of dew on the lens to extend your undisturbed observing time. Also improves visual and photographic contrast by shielding the lens from off-axis ambient light (the neighbor's yard light, moonlight, etc.) For transport, the retractable lens shade keeps the overall length of the optical tube to a very manageable 28\" when it is retracted and the visual extension tube removed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRack and pinion focuser: \u003c\/strong\u003e2.7\" focuser, with a 2\" eyepiece\/accessory holder that threads into the 2.7\" focuser drawtube. A 1.25\" compression ring eyepiece\/star diagonal holder is also supplied. The non-marring soft nylon compression ring of the 1.25\" eyepiece holder won't scratch the barrels of your accessories or star diagonal, as ordinary thumbscrews can. Dual focusing knobs provide precise image control with either hand. The large focus knobs are easy to operate, even while wearing gloves or mittens in cold weather. A large thumbscrew locks the focuser tube in place without image shift for photography. \u003cbr\u003eA useful photographic accessory would be the Takahashi #CAA102 camera angle adjuster, shown below. This attaches to the 2.7\" focuser drawtube in place of the 2\" eyepiece holder. It allows the photographic accessory train to be rotated to the most appropriate angle to frame the object being photographed (a landscape format, portrait, or any angle in between) without having to loosen the camera adapter and perhaps lose the correct focus. Once the camera is oriented correctly, a large knob on the side of the adjuster can be tightened to hold the camera in place during the exposure. It is also very handy for visual applications to position the star diagonal or binoviewer at the most comfortable viewing angle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinderscope mounting point: \u003c\/strong\u003eNo finderscope is supplied when this optical tube is bought alone. A flat boss with two mounting bolt holes is provided on the top of the focuser body for mounting an optional Takahashi 7x50mm 6.2° field finder and bracket finderscope.\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong back focus: \u003c\/strong\u003eBack focus is a very good 227.5mm, allowing the stacking of a wide variety of CCD cameras, color filter wheels, electric focusers, camera angle adjusters, and film cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptional photographic accessories: \u003c\/strong\u003eTwo accessories are available to provide a variety of image scales and sky coverage: a field flattener and a focal reducer. The field flattener (#TOA130FF) reduces the focal ratio slightly (to f\/7.3), but gives pinpoint stars to the very edges of a 40mm (2.6°) image circle for virtually unvignetted 35mm\/DSLR\/large format CCD images. \u003cbr\u003eThe focal reducer (#TOA130R) effectively cuts the focal length to 672mm and the focal ratio to f\/5.6. The photographic field is now 3.4°, spread over a 40mm image circle for virtually unvignetted 35mm\/DSLR\/large format CCD images. A variety of photographic coupling attachments and eyepiece projection photography adapters are also available.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting rings: \u003c\/strong\u003eNo mounting rings are supplied for the 125mm diameter 15.4 pound optical tube. Several options are available. One is the Takahashi clamshell-type tube holder (#120TH) shown below that is designed specifically for mounting the TSA-120 on a Takahashi EM-11 or larger equatorial mount. The second option is the Takahashi double ring tube holder with bridge (#120DTH) shown below. It can be mounted on a non-Takahashi mount, such as a Celestron CGEM or CGE Pro or Losmandy GM-8 or G-11, by using an optional dovetail plate. This double ring tube holder can also be used to mount the TSA-120 on a Takahashi EM-11 or larger equatorial mount by adding optional Takahashi #TMP106 double ring tube holder mounting plate. A third option is a pair of Parallax split mounting rings (#PFS106), also shown below, for mounting on a non-Takahashi mount, using an optional dovetail plate.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/blockquote\u003e\n\u003cp\u003eThe image above shows the scope with a 7 x 50mm finderscope, mounting bracket, and eyepiece. These accessories are not provided as standard equipment with the optical tube, but are available as optional accessories.\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\"\u003e4.72\"\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\"\u003e900mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/7.5\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\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e250x\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\"\u003e15.4 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\"\u003e0.97 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e12.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e5 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":40221670899785,"sku":"TSA120","price":4450.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/18882.jpg?v=1662967927"},{"product_id":"questar-field-model-90mm-broadband-coatings-zerodur-mirror-53-80x-case","title":"Questar Field Model, 90mm, Broadband Coatings, Zerodur Mirror, 53\/80x, Case","description":"\u003cp\u003eWith all due respect to the other spotting scopes shown on this site, there can only be one \"best spotting scope in the world.\" This Questar Field Model is it . . .\u003c\/p\u003e\n\u003cp\u003eWith all due respect to the other spotting scopes shown on this site, there can only be one \"best spotting scope in the world.\" This Questar Field Model with Broadband coatings and a Zerodur mirror is it. Its resolution is truly remarkable, exceeding the theoretical limits for a 3.5\" aperture scope. While optical theory predicts 0.33\" resolution at a distance of half a mile, a Questar can routinely resolve much thinner bicycle spokes at the same distance, and show you leaf stems at a distance of one mile!\u003c\/p\u003e\n\u003cp\u003eOne of our customers from Nebraska called up shortly after he received his Field Model to say his scope clearly showed the power line into his neighbor's house. We didn't think that was all that impressive - until he told us his neighbor lived three miles away! As a review in \u003cem\u003eAudubon \u003c\/em\u003emagazine noted, \"Brighter than reality, the Questar has unbelievably sharp resolution and an extremely flat field. It shows every feather from a half-mile away!\" (Exclamation point theirs.)\u003c\/p\u003e\n\u003cp\u003eA Questar has no astigmatism or chromatic aberration - no optical problems of any kind - to detract from your enjoyment. The \u003cem\u003eAudubon \u003c\/em\u003ereview added, \"the Field Model is unrivalled as a catadioptric spotting scope. It sets the highest standards for both optical performance and convenience of use.\"\u003c\/p\u003e\n\u003cp\u003eA review in Cornell University's \u003cem\u003eLiving Bird \u003c\/em\u003emagazine said, \"The legendary Questar. There's no question that for the right application this is a fantastic scope.\"\u003c\/p\u003e\n\u003cp\u003eAnd just what is the right application? According to the \u003cem\u003eLiving Bird \u003c\/em\u003ereview, \"there are times when the Questar is indispensable. During the World Series of Birding, the Lab team spied a white blob on an old water tower. Rick put his trusty Bushnell Spacemaster on it at 22x - still a white blob. Kevin tried the Kowa TSN-4 at 60x and saw a white blob that might be a large bird. Finally Todd trained the Questar on it, flipped to 80x, and got a crystal-clear image of a roosting barn owl.\"\u003c\/p\u003e\n\u003cp\u003eWhat is the right application? It is any birding challenge where you need absolutely razor-sharp views of distant birds. The supplied standard equipment eyepiece gives you a basic 53x magnification. A built-in Barlow lens increases that power to 80x at the touch of your finger on a lever at the rear of the scope. Another lever instantly converts the 53x eyepiece to a 4x finder with an exceptionally wide 12 degree field of view (630' at 1000 yards). You never risk losing your subject as you move your eye from finder to eyepiece, because finder and eyepiece are one and the same. (Both provide erect but reversed mirror images.)\u003c\/p\u003e\n\u003cp\u003eFor those birders who prefer lower powers and a wider field for close-in birding, an optional 40x eyepiece is available that provides 60x when the built-in Barlow is used. With the optional 40x eyepiece in the eyepiece holder, the 4x finderscope magnification drops to 3x, but with an even wider field of view (14 degrees, which is a very wide 735' at 1000 yards). The 40x eyepiece can be substituted for the standard equipment 53x eyepiece at no extra cost, if the substitution is requested at the time your scope is ordered. The 40x eyepiece is also available for separate sale, to give you a total of four separate magnifications from only two eyepieces (using the scope's built-in Barlow lens to increase the power of each eyepiece). A rolldown rubber eyecup is provided on all eyepieces for eyeglass use, although eye relief is relatively limited at higher powers.\u003c\/p\u003e\n\u003cp\u003eBecause of its high power and its ability to focus as close as 8' (although with a very shallow depth of field at that close a distance), the Field Model is a marvelous long distance microscope for close-up studies of subjects that are too small or too dangerous or too fragile to examine at close hand - ant hills, bee hives, spider webs, etc. At its standard 53x magnification, subjects 10 feet away appear the same size as they would if you could get your eye within a mere 2.2\" of them, with a field only 1.8\" wide filling your eyepiece! Imagine your views of gape-mouthed chicks being fed in nearby nests, hummers at feeders, and more!\u003c\/p\u003e\n\u003cp\u003eThe black and satin-finished aluminum Field Model comes with a 3\/16\" thick machined thread-on metal protective dust cap. A slide-on metal lens shade improves both visual and photographic contrast. Other standard equipment includes a camera coupling set that lets you use the Field Model as a razor-sharp 1400mm (28x) f\/16 telephoto lens by adding an optional Questar brand P-thread T-ring to fit your particular camera body.\u003c\/p\u003e\n\u003cp\u003eThe Field Model has extremely precise 50-turn knob focusing. (We Questar owners soon learn to roll the side of our finger along the side of the focusing knob to speed up focus changes, rather than turn, turn, turn with our fingertips.) Faster-acting 24-turn focusing is available as a factory-installed option for more quickly tracking moving birds and wildlife (although at the cost of increasing the close focus distance to 25' from the standard 8').\u003c\/p\u003e\n\u003cp\u003eAn optional roof prism image erector, #6351, is available to allow straight-through viewing (from inside a car being used as a mobile blind, for example, using an optional car window mount). There is a loss of field when the image erector is used (from 54' down to 47' with the 40x eyepiece), the lever that changes from finder to a high power view is disabled, and you can only change powers by changing eyepieces, as the Barlow and finder optics are no longer in the optical path.\u003c\/p\u003e\n\u003cp\u003eThis broadband coated version has high transmission\/low reflection broadband multicoatings on its objective lens, rather than the standard Field Model's single layer magnesium fluoride antireflection lens coatings. In addition, the mirrors are coated with high reflectivity silver, rather than the aluminum coatings of the standard Field Model. Compared to the standard #QF Field Model, this broadband multicoated version gives you a full 22% higher light transmission and increased contrast that's very useful for twilight viewing and photography. Broadband coatings are not recommended for those who live full time at the seashore, however, as a constant exposure to salt air can cause the silver mirror coatings to deteriorate. Occasional exposure to salt sea air on vacations or field trips is not a problem.\u003c\/p\u003e\n\u003cp\u003eIn addition, a thermally-stable Zerodur ceramic mirror is used in place of the standard model's Pyrex mirror for critical photographic situations that don't allow focus changes during wide temperature swings. (If the temperature differential between indoors and outdoors is 30 degrees to 40 degrees Fahrenheit or more, occasional minor refocusing will be required with the standard Field Model as its Pyrex mirror gradually cools down to reach the outdoor air temperature.) A Zerodur mirror eliminates such minor refocusing in the Arctic or Sahara, but is usually not needed in the continental United States or Hawaii, as well as in most of Canada.\u003c\/p\u003e\n\u003cp\u003eA foam-fitted waterproof hard case is standard equipment.\u003c\/p\u003e\n\u003cp\u003eThe Field Model has a ten-year Questar warranty (with a two-year warranty on the focuser mechanism and a five-year warranty on the broadband coatings).\u003c\/p\u003e\n\u003cp\u003eAs the review in \u003cem\u003eAudubon \u003c\/em\u003econcluded simply, \"Questar is superb.\" If you want the world's very best spotting scope, this Questar Field Model with broadband coatings and a Zerodur mirror is it. Period. Case closed.\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\"\u003e3.5\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eArmored\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eExit Pupil\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1.7mm @ 53x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view 1000 yards\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e46' @ 53x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e11\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMagnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e53\/80x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNear Focus\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e8'\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePhotographic Focal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1400mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePhotographic Focal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/16\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTwilight Factor\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e68.7 @ 53x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e10 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\u003cul\u003e\n\u003cli\u003eHigh transmission\/low reflection broadband multicoatings\u003c\/li\u003e\n\u003cli\u003eLow expansion Zerodur ceramic mirror\u003c\/li\u003e\n\u003cli\u003eEyepiece\u003c\/li\u003e\n\u003cli\u003eBuilt-in 1.5x Barlow and 4x finder\u003c\/li\u003e\n\u003cli\u003eLens shade\u003c\/li\u003e\n\u003cli\u003eCamera adapter\u003c\/li\u003e\n\u003cli\u003eDust covers\u003c\/li\u003e\n\u003cli\u003eHard case\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Questar","offers":[{"title":"Default Title","offer_id":40221674897481,"sku":"QFBZ","price":4595.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/19596.jpg?v=1662968060"},{"product_id":"explore-scientific-ar102-4-f-6-5-achromatic-doublet-refractor-optical-tube","title":"Explore Scientific AR102 4\" f\/6.5 Achromatic Doublet Refractor Optical Tube","description":"\u003cdiv class=\"heading\"\u003e\u003cstrong\u003eThis Explore Scientific 4\" refractor has:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e\n\u003cul\u003e\n\u003cli\u003eBig 4\" aperture fully multicoated achromatic doublet refractor optics\u003c\/li\u003e\n\u003cli\u003eCollimatable objective lens cell for fine-tuning the images\u003c\/li\u003e\n\u003cli\u003eBig 8 x 50mm finderscope\u003c\/li\u003e\n\u003cli\u003e2\" dielectric star diagonal with 1.25\" eyepiece adapter\u003c\/li\u003e\n\u003cli\u003eTube rings with carry handle and Vixen-style dovetail plate\u003c\/li\u003e\n\u003cli\u003eLifetime transferrable warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003eThis highly portable 4\" achromatic refractor optical tube (only 25.5\" long, with a weight of 11.3 pounds) is a sensational value! It has a 102mm (4\") diameter multicoated doublet objective lens (663mm focal length f\/6.5). Its diffraction limited optics are sharp and well suited to serious deep space observing of binary stars, star clusters, and the brighter nebulas and galaxies, in addition to excellent high contrast planetary and lunar images. The objective lens cell is fully collimatable, using push\/pull collimation screws, so you can optimize your image quality.\u003c\/p\u003e\n\u003cp\u003eThe 4\" Explore Scientific is a great grab-and-go scope for quick looks at the sky when mounted on a suitable altazimuth mount. It's good enough optically to be the heart of a reasonably-priced serious observing system when mounted on one of the many equatorial mounts and go-to altazimuth mounts from Celestron, iOptron, and others.\u003c\/p\u003e\n\u003cp\u003eSome chromatic aberration is visible on stars and objects of 2nd or 3rd magnitude and brighter, as you would expect in an achromatic refractor with such a fast focal ratio. However, the spurious color is well controlled and not unreasonable, thanks to careful optical design, and has little effect on deep space observing. Most observers feel the relatively limited amount of chromatic aberration visible is a small price to pay for the scope's many other virtues of portability, sharpness, contrast, and optical clarity.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDetails About This Optical Tube . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAchromatic refractor optics:\u003c\/strong\u003e 4\" (102mm) aperture, 663mm focal length, f\/6.5 air-spaced crown and flint glass doublet lens. Tube diameter is 3.96\" (100.7mm) and the tube length with dewshield installed is 25.5\" (648mm). Scope weight is 11.3 pounds (4.67 kg).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCollimatable lens cell:\u003c\/strong\u003e The 4\" Explore Scientific lens is precision collimated at the factory to give optimum performance. Although you may never need to adjust optical alignment, the ES102D allows for collimating the lens set should the telescope ever require it due to a fall or very rough handling.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMulticoated optics:\u003c\/strong\u003e Fully coated on all surfaces with multiple layers of antireflection materials for high light transmission and good contrast.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInternal light baffles:\u003c\/strong\u003e Multiple internal knife-edge baffles in the optical tube mask and deflect unwanted stray light for improved contrast.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDew shield:\u003c\/strong\u003e The removable 190.5mm (7.5\") diameter dew shield slows the formation of dew on the lens in cold weather to extend your undisturbed observing time. Also improves visual and photographic contrast by shielding the lens from off-axis ambient light (the neighbor's yard light, moonlight, etc.)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDust covers:\u003c\/strong\u003e Front and rear dust covers are provided.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDual-speed Crayford-style focuser:\u003c\/strong\u003e 2\" focuser, with adjustable tension and lock knobs. The 2\" eyepiece holder uses a non-marring brass compression ring to hold the supplied 2\" star diagonal in place without scratching the diagonal barrel. The precision-made 2\" focuser has dual-speed focusing. There are two coarse focusing knobs. The right knob also has a smaller concentric knob with 10:1 ratio reduction gear microfine focusing. This provides exceptionally precise image control during high power visual observing or critical DSLR or CCD imaging. The focus knobs have ribbed gripping surfaces so they are easy to operate, even while wearing gloves or mittens in cold weather.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDielectric star diagonal:\u003c\/strong\u003e 90° viewing angle first surface mirror 2\" star diagonal with 1.25\" eyepiece adapter. The diagonal uses durable 99% reflectivity for maximum light transmission and long life.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFinderscope:\u003c\/strong\u003e 8 x 50mm straight-through achromatic design, in a dual-ring six-point adjustment bracket with a quick release mounting shoe. Focuses by loosening the trim ring behind the objective lens cell, screwing the lens cell in or out to focus, and tightening the trim ring to lock in the correct focus.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDovetail and tube rings:\u003c\/strong\u003e The optical tube comes with two split and hinged tube rings for installing the optical tube on your mount. The rings are connected to a dovetail mounting plate that slips into the industry standard Vixen-style dovetail groove on altazimuth and equatorial mounts from Astro-Tech, Explore Scientific, Celestron, iOptron, and others. A carrying handle is conveniently fitted to the top of the tube rings.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExtended lifetime warranty:\u003c\/strong\u003e This individually serial numbered Explore Scientific telescope is backed by a limited one year warranty, which will be extended to an Explore Scientific transferable Life of the Product Limited Warranty when its warranty card is registered with Explore Scientific within 60 days of purchase.\u003cbr\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\"\u003e4\"\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\"\u003e663mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/6.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGalaxy and Nebula Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eFair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1.3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e166x\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\"\u003e11.3 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\"\u003e1.14 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e12.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eLimited Lifetime\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":40481972518985,"sku":"ES102D","price":499.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/19782.jpg?v=1675378869"},{"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":"explore-scientific-ar127-5-f-6-5-achromatic-doublet-refractor","title":"Explore Scientific AR127 5\" f\/6.5 Achromatic Doublet Refractor Optical Tube","description":"\u003cp\u003eThis 5\" Explore Scientific achromatic refractor optical tube is a big performer, both inside the solar system and out in the realm of the nebulas and galaxies, at a not so very big price.\u003c\/p\u003e\n\u003cdiv class=\"heading\"\u003e\u003cstrong\u003eThis 5\" Explore Scientific ES127D achromatic doublet refractor has:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e\n\u003cul\u003e\n\u003cli\u003eBig 5\" aperture fully multicoated achromatic doublet refractor optics\u003c\/li\u003e\n\u003cli\u003eCollimatable objective lens cell for fine-tuning the images\u003c\/li\u003e\n\u003cli\u003eBig 8 x 50mm finderscope\u003c\/li\u003e\n\u003cli\u003e2\" dielectric star diagonal with 1.25\" eyepiece adapter\u003c\/li\u003e\n\u003cli\u003eTube rings with carry handle and Vixen-style dovetail plate\u003c\/li\u003e\n\u003cli\u003eExtended lifetime transferrable warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003eThis highly portable 5\" Explore Scientific ES127D achromatic doublet refractor optical tube (only 35\" long, with a weight of 15 pounds) is an exceptional value. It has a 127mm (5\") diameter multicoated doublet objective lens (825mm focal length f\/6.5). Its diffraction limited optics are sharp and well suited to serious deep space observing of binary stars, star clusters, and the brighter nebulas and galaxies, in addition to excellent high contrast planetary and lunar images. The objective lens cell is fully collimatable, so you can optimize your image quality.\u003c\/p\u003e\n\u003cp\u003eThe 5\" Explore Scientific ES127D is a great grab-and-go scope for quick looks at the sky when mounted on a suitable altazimuth mount. It's good enough optically to be the heart of a reasonably-priced serious observing system when mounted on one of the many equatorial mounts and go-to altazimuth mounts from Celestron, iOptron, and others.\u003c\/p\u003e\n\u003cp\u003eSome chromatic aberration is visible on stars and objects of 2nd or 3rd magnitude and brighter, as you would expect in an achromatic refractor with such a fast focal ratio. However, the spurious color is well controlled and not unreasonable, thanks to careful optical design, and has little effect on deep space observing. Most observers feel the relatively limited amount of chromatic aberration visible is a small price to pay for the scope's many other virtues of portability, sharpness, contrast, and optical clarity.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures of This Optical Tube . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAchromatic refractor optics:\u003c\/strong\u003e 5\" (127mm) aperture, 825mm focal length, f\/6.5 air-spaced crown and flint glass doublet lens. Tube diameter is 5.13\" (130.4mm) and the tube length with dew shield installed is 34\" (864mm). Scope weight is 15 pounds (6.82 kg).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCollimatable lens cell:\u003c\/strong\u003e The 5\" Explore Scientific lens is precision collimated at the factory to give optimum performance. Although you may never need to adjust optical alignment, the ES127D allows for collimating the lens set should the telescope ever require it due to a fall or very rough handling.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMulticoated optics:\u003c\/strong\u003e Fully coated on all surfaces with multiple layers of antireflection materials for high light transmission and good contrast.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInternal light baffles:\u003c\/strong\u003e Multiple internal knife-edge baffles in the optical tube mask and deflect unwanted stray light for improved contrast.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDew shield:\u003c\/strong\u003e The removable dew shield slows the formation of dew on the lens in cold weather to extend your undisturbed observing time. It also improves visual and photographic contrast by shielding the lens from off-axis ambient light (the neighbor's yard light, moonlight, etc.)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDust covers:\u003c\/strong\u003e Front and rear dust covers are provided.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDual-speed Crayford-style focuser:\u003c\/strong\u003e 2\" focuser, with adjustable tension and lock knobs. The 2\" eyepiece holder uses a non-marring brass compression ring to hold the supplied 2\" star diagonal in place without scratching the diagonal barrel. The precision-made 2\" focuser has dual-speed focusing. There are two coarse focusing knobs. The right knob also has a smaller concentric knob with 10:1 ratio reduction gear microfine focusing. This provides exceptionally precise image control during high power visual observing or critical DSLR or CCD imaging. The focus knobs have ribbed gripping surfaces so they are easy to operate, even while wearing gloves or mittens in cold weather.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDielectric star diagonal:\u003c\/strong\u003e 90° viewing angle first surface mirror 2\" star diagonal with 1.25\" eyepiece adapter. The diagonal uses durable 99% reflectivity for maximum light transmission and long life.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFinderscope:\u003c\/strong\u003e 8 x 50mm straight-through achromatic design, in a dual-ring six-point adjustment bracket with a quick release mounting shoe. Focuses by loosening the trim ring behind the objective lens cell, screwing the lens cell in or out to focus, and tightening the trim ring to lock in the correct focus.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRings and dovetail tube mount:\u003c\/strong\u003e The optical tube comes with two split and hinged tube rings for installing the optical tube on your mount. The rings are connected to a dovetail mounting plate that slips into the standard dovetail groove on Astro-Tech Voyager, Explore Scientific, Celestron, and iOptron mounts, among others. A carrying handle is conveniently fitted to the top of the tube rings\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExtended lifetime warranty:\u003c\/strong\u003e This individually serial numbered Explore Scientific telescope is backed by a limited one year warranty, which will be extended to an Explore Scientific transferable Life of the Product limited warranty when its warranty card is registered with Explore Scientific within 60 days of purchase.\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\"\u003e5\"\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\"\u003e825mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/6.5\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\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e236x\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\"\u003e15 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\"\u003e0.91 arc seconds\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\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eLimited Lifetime\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\u003eDual tube rings with Vixen-style dovetail and carry handle\u003c\/li\u003e\n\u003cli\u003e8 x 50mm straight-through finderscope\u003c\/li\u003e\n\u003cli\u003e2\" dual speed Crayford focuser\u003c\/li\u003e\n\u003cli\u003e2\" dielectric star diagonal with 2\" and 1.25\" brass compression ring eyepiece holders\u003c\/li\u003e\n\u003cli\u003eRemovable dew shield\u003c\/li\u003e\n\u003cli\u003eDust covers\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":40481972617289,"sku":"ES127D","price":749.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/19920.jpg?v=1675378875"},{"product_id":"explore-scientific-ar152-6-f-6-5-achromatic-doublet-refractor-optical-tube","title":"Explore Scientific AR152 6\" f\/6.5 Achromatic Doublet Refractor Optical Tube","description":"\u003cp\u003eThis 6\" Explore Scientific AR152 achromatic refractor optical tube is a sensational value - a big 6\" (152mm) and fast f\/6.5 refractor that's priced like an 80mm scope.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Explore Scientific AR152 6\" achromatic refractor has:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ebig 6\" aperture fully multicoated achromatic doublet refractor optics\u003c\/li\u003e\n\u003cli\u003ecollimatable objective lens cell for fine-tuning the images\u003c\/li\u003e\n\u003cli\u003edual-speed 2\" Crayford focuser with 10:1 ratio fine focusing \u003c\/li\u003e\n\u003cli\u003e2\" dielectric star diagonal with 2\" and 1.25\" brass compression ring eyepiece holders\u003c\/li\u003e\n\u003cli\u003ebig 8 x 50mm finderscope\u003c\/li\u003e\n\u003cli\u003etube rings with carry handle and Vixen-style dovetail plate\u003c\/li\u003e\n\u003cli\u003ebright high contrast deep space views, plus excellent performance inside the solar system\u003c\/li\u003e\n\u003cli\u003eextended lifetime warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis large aperture 6\" Explore Scientific ES152D achromatic doublet refractor optical tube is a big scope (41\" long, with a weight of 23.5 pounds), with big performance to match. It has a 152mm (6\") diameter multicoated doublet objective lens (988mm focal length f\/6.5) that gathers 44% more light than a 5\" scope. Its diffraction limited optics are sharp and well suited to serious deep space observing of binary stars, star clusters, and faint nebulas and galaxies, in addition to excellent high contrast planetary and lunar images. The objective lens cell is fully collimatable, so you can optimize your image quality.\u003c\/p\u003e\n\u003cp\u003eThe 6\" Explore Scientific ES152D is good enough optically to be the heart of a reasonably-priced serious observing system when mounted on one of the many equatorial mounts and go-to altazimuth mounts from Celestron, Meade, iOptron, and others.\u003c\/p\u003e\n\u003cp\u003eSome chromatic aberration is visible on stars and objects of 2nd or 3rd magnitude and brighter, as you would expect in a big achromatic refractor with such a fast focal ratio. However, the spurious color is well controlled and not unreasonable, thanks to careful optical design, and has little effect on deep space observing. Most observers feel the relatively limited amount of chromatic aberration visible is a small price to pay for the scope's many other virtues of portability, sharpness, contrast, and optical clarity.\u003c\/p\u003e\n\u003cp style=\"font-weight: bold;\"\u003e\u003cstrong\u003eDetails About This Optical Tube . . . \u003c\/strong\u003e\u003c\/p\u003e\n\u003cblockquote\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong style=\"font-weight: bold;\"\u003eAchromatic refractor optics: \u003c\/strong\u003e6\" (152mm) aperture, 988mm focal length, f\/6.5 air-spaced crown and flint glass doublet lens. Tube diameter is 6.21\" (157.7mm) and the tube length with dewshield installed is 41\" (1041mm). Scope weight is 23.5 pounds (10.7 kg).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong style=\"font-weight: bold;\"\u003eCollimatable lens cell: \u003c\/strong\u003eThe 6\" Explore Scientific lens is precision collimated at the factory to give optimum performance. Although you may never need to adjust optical alignment, the ES152D allows for collimating the lens set should the telescope ever require it due to a fall or very rough handling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong style=\"font-weight: bold;\"\u003eMulticoated optics: \u003c\/strong\u003eFully coated on all surfaces with multiple layers of antireflection materials for high light transmission and good contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong style=\"font-weight: bold;\"\u003eInternal light baffles: \u003c\/strong\u003eMultiple internal knife-edge baffles in the optical tube mask and deflect unwanted stray light for improved contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong style=\"font-weight: bold;\"\u003eDew shield: \u003c\/strong\u003eThe removable dew shield slows the formation of dew on the lens in cold weather to extend your undisturbed observing time. It also improves visual and photographic contrast by shielding the lens from off-axis ambient light (the neighbor's yard light, moonlight, etc.)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong style=\"font-weight: bold;\"\u003eDust covers: \u003c\/strong\u003eFront and rear dust covers are provided.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong style=\"font-weight: bold;\"\u003eDual-speed Crayford-style focuser: \u003c\/strong\u003e2\" focuser, with adjustable tension and lock knobs. The 2\" eyepiece holder uses a non-marring brass compression ring to hold the supplied 2\" star diagonal in place without scratching the diagonal barrel. The precision-made 2\" focuser has dual-speed focusing. There are two coarse focusing knobs. The right knob also has a smaller concentric knob with 10:1 ratio reduction gear microfine focusing. This provides exceptionally precise image control during high power visual observing or critical DSLR or CCD imaging. The focus knobs have ribbed gripping surfaces so they are easy to operate, even while wearing gloves or mittens in cold weather.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong style=\"font-weight: bold;\"\u003eDielectric star diagonal: \u003c\/strong\u003e90° viewing angle first surface mirror 2\" star diagonal with 1.26\" eyepiece adapter. The diagonal uses durable 99% reflectivity for maximum light transmission and long life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong style=\"font-weight: bold;\"\u003eFinderscope:\u003c\/strong\u003e 8 x 50mm straight-through achromatic design, in a dual-ring six-point adjustment bracket with a quick release mounting shoe. Focuses by loosening the trim ring behind the objective lens cell, screwing the lens cell in or out to focus, and tightening the trim ring to lock in the correct focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong style=\"font-weight: bold;\"\u003eDovetail tube mount: \u003c\/strong\u003eThe optical tube comes with two split and hinged tube rings for installing the optical tube on your mount. The rings are connected to a dovetail mounting plate that slips into the standard dovetail groove on Explore Scientific, Celestron, Meade LX80, Vixen, and similar mounts. A carrying handle is conveniently fitted to the top of the tube rings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong style=\"font-weight: bold;\"\u003eExtended lifetime warranty: \u003c\/strong\u003eThis individually serial numbered Explore Scientific telescope is backed by a limited one year warranty, which will be extended to an Explore Scientific \u003cem\u003etransferable product lifetime\u003c\/em\u003e limited warranty when its warranty card is registered with Explore Scientific within 60 days of purchase. Full details on this \u003ca href=\"https:\/\/www.astronomics.com\/explore-scientific-warranty-information_t.aspx\"\u003eunique transferable lifetime warranty\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\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\"\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\"\u003eGreat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e988mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/6.5\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\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e282x\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\"\u003e23.5 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePlanetary Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eGreat\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\u003eTelescope Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eRefractor\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\"\u003eLimited Lifetime\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003eSupplied Accessories: \u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDual tube rings with Vixen-style dovetail and carry handle\u003c\/li\u003e\n\u003cli\u003e8 x 50mm straight-through finderscope\u003c\/li\u003e\n\u003cli\u003e2\" dual speed Crayford focuser\u003c\/li\u003e\n\u003cli\u003e2\" dielectric star diagonal with 2\" and 1.26\" brass compression ring eyepiece holders\u003c\/li\u003e\n\u003cli\u003eRemovable dew shield\u003c\/li\u003e\n\u003cli\u003eDust covers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/blockquote\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":40481972682825,"sku":"ES152D","price":849.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/19921.jpg?v=1675378876"},{"product_id":"astro-tech-at60edt-60mm-f-7-ed-triplet-apo-refractor-white-and-gray-tube","title":"Astro-Tech At60Edt 60Mm F\/7 Ed Triplet Apo Refractor, White And Gray Tube","description":"\u003cp\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003eTHIS PRODUCT HAS BEEN DISCONTINUED.  THIS PAGE IS HERE FOR INFORMATIONAL PURPOSES ONLY.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\r\n\u003cp\u003eThe Astro-Tech AT60EDT is a very compact\/very high quality apochromatic triplet refractor that is equally at home observing visually or doing serious wide field imaging . . . \u003c\/p\u003e\u003cp\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003e\u003cstrong\u003eTHIS PRODUCT HAS BEEN DISCONTINUED.  THIS PAGE IS HERE FOR INFORMATIONAL PURPOSES ONLY.\u003c\/strong\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\r\n\u003cp\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\r\n\u003cp\u003e\u003cstrong\u003eThis Astro-Tech AT60EDT ED triplet refractor has:\u003cbr\u003e\u003cbr\u003e• 60mm f\/7 fully multicoated apochromatic ED triplet refractor optics\u003cbr\u003e• dual-speed rotating 2\" rack-and-pinion focuser with 10:1 ratio fine focusing\u003cbr\u003e• 2\" and 1.25\" non-marring compression ring accessory holders\u003cbr\u003e• combined dovetail\/tripod bracket for use on a photo tripod or a German equatorial mount\u003cbr\u003e• retractable self-storing lens shade\u003cbr\u003e• amazing wide field astrophotographic capabilities\u003cbr\u003e• long-lasting white and gray paint finish\u003cbr\u003e• aluminum-frame foam-fitted hard case\u003cbr\u003e• two-year warranty\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eThe Astro-Tech AT60EDT is a superb grab-and-go visual scope, a fine wide-field astrograph, and a daytime spotting scope. Its 420mm f\/7 ED air-spaced apochromatic triplet optics are essentially free from spurious color (chromatic aberration), even at high magnifications. The optical performance - both visually and photographically - is little short of astonishing. \u003cbr\u003e\u003cbr\u003eThe exceptional AT60EDT triplet optics are even more impressive when you consider the package they come in. The substantial (5.3 pounds) and finely-machined scope has a dual speed 2\" rack-and-pinion focuser with a microfine 10:1 fine-focusing ratio. You can rotate the focuser a full 360° to put your eyepiece or camera in the most comfortable observing position. The supplied 2\" and 1.25\" eyepiece adapters use non-marring brass compression rings that won't scratch your eyepiece and accessory barrels. The Astro-Tech AT60EDT has a retractable lens shade and comes in a locking aluminum-frame hard carrying case.\u003cbr\u003e\u003cbr\u003eThis 11\" long refractor optical tube (14\" long with the lens shade extended) has the right balance of aperture and focal length to use as a low-power rich field telescope, as a medium-power planetary telescope, or as any kind of telescope in between. Its compact size and convenient removable L-shaped mounting foot that mounts on any photographic tripod also make it an excellent terrestrial spotting scope for vacations, birding, or nature studies. In addition, optional camera adapters turn the AT60EDT into a superb 420mm (8.4x with a 35mm camera or a large chip DSLR) f\/7 daytime telephoto lens and nighttime wide-field astrograph. The photo tripod mounting foot is also a Vixen-style dovetail that mounts directly on many altazimuth and German equatorial mounts, such as those from Astro-Tech, Celestron, Meade, and Vixen.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eFeatures of this Astro-Tech refractor. . .\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eED triplet refractor optics:\u003c\/strong\u003e 60mm (2.36\") aperture, 420mm focal length, f\/7 focal ratio air-spaced triplet lens using premium Ohara glass from Japan, including an ED (Extra-low Dispersion glass) element to reduce spurious color halos and fringing to apochromatic levels. \u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eMulticoated optics:\u003c\/strong\u003e The objective lens has the latest state-of-the-art broadband 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, even in brightly lit situations. 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.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eAnti-reflection treatment:\u003c\/strong\u003e The interior of the optical tube uses special matte black paint and anti-reflection threading the full length of the focuser drawtube for truly dark sky backgrounds and high daytime terrestrial contrast. In addition, the edges of the objective lens are blackened to eliminate contrast-reducing stray internal reflections.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eFull power range capability:\u003c\/strong\u003e The \"highest useful magnification\" is theoretically 140x. This is the power obtained with a 3mm eyepiece, which provides an exit pupil of 0.43mm (less than 1\/50th of an inch) and 59x per inch of aperture. This is generally the smallest exit pupil recommended with any telescope before the images start to become too dim to be consistently useful.\u003cbr\u003eHigher powers are possible for lunar and planetary observing, however, given excellent seeing conditions, although the increasing dimness of the image will start to limit the performance on all but the brightest objects.\u003cbr\u003eThe lowest useful power is 10.5x, achieved with a 40mm eyepiece (a 40mm 1.25\" TeleVue Plössl will give you a 4.1° field at that power; while a 2\" Explore Scientific 40mm 68° Series will give you a 6.48° field). At 4.4x per inch of aperture, this is very close to the 4x per inch of aperture generally regarded as the lowest practical power with any telescope. A 40mm eyepiece on the AT60EDT will give you a 5.7mm exit pupil, about the maximum to which most eyes can dilate. Any lower power would simply waste some of the scope's light gathering capacity, as some of its exit pupil, and some of the scope's collected light, would fall on your iris, rather than entering your eye.\u003cbr\u003e\u003cbr\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 a neighbor's backyard security light.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eDual speed microfine 2\" rack-and-pinion focuser with 1.25\" adapter:\u003c\/strong\u003e The precision-made 2\" focuser has dual-speed focusing. There are two coarse focusing knobs. The right knob also has a smaller concentric knob with 10:1 ratio reduction gear microfine focusing. This provides exceptionally precise image control during high power visual observing or critical DSLR or CCD imaging. The focus knobs have knurled rubber and ribbed gripping surfaces so they are easy to operate, even while wearing gloves or mittens in cold weather. \u003cbr\u003eThe drawtube has a very long 95mm (3.75\") travel for imaging, with a scale marked in 1mm increments so you can note individual focuser positions for easy return to the correct focus when switching between visual use and photography. A large knurled lock knob under the focuser lets you solidly lock in your photographic focus.\u003cbr\u003eThe new heavy-duty patent-pending focuser has a precisely-machined 20mm brass rack with a unique slot machined down the center of the rack. When the lock knob on the focuser drawtube is tightened, a slotted shaft on the knob engages the lip of the slot in the rack. This provides a solid metal-to-metal grip on the rack (not merely added friction) to provide an absolute lock of the photographic focus. There is no possibility of focuser slippage once the lock knob is tightened firmly, no matter what the weight of the photo accessories.    \u003cbr\u003eThe focuser drawtube terminates in a 2\" compression ring accessory holder to accept a 2\" star diagonal or 2\" photo accessories. A lock knob on the top of the scope allows the focuser to be rotated a full 360°. This lets you rotate the focuser to line up a camera in either a landscape or portrait orientation (or any orientation in between), as well as put a star diagonal and eyepiece into the most comfortable observing position, and then temporarily lock the focuser in that position.\u003cbr\u003eThe supplied 1.25\" accessory adapter slips onto the 2\" accessory holder and uses a soft brass compression ring to hold 1.25\" star diagonals and photo\/visual accessories in place. The 1.25\" and 2\" compression rings won't scratch the barrels of your star diagonal or accessories as an ordinary thumbscrew can.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eCombined equatorial dovetail\/tripod adapter:\u003c\/strong\u003e The AT60EDT has a removable L-shaped dovetail mounting foot\/tripod adapter. The 1.75\" wide x 3.25\" long mounting foot is sized and shaped (with slanted sides) to fit the Vixen-style dovetail slot on the head of many altazimuth and equatorial mounts. It will fit, without modification, the Astro-Tech Voyager altazimuth mount and the Celestron CG-5 and Advanced Series, Meade LXD-75, and Vixen Great Polaris German equatorial mounts, among others.\u003cbr\u003eIn addition, the mounting shoe has a 1\/4\"-20 thread mounting hole that allows it to be installed on any camera tripod that has a standard 1\/4\"-20 thread mounting bolt. \u003cbr\u003eCork pads on the underside of the mounting shoe help keep the scope from swiveling when mounted on a photo tripod. The dovetail is removable to allow the 75mm diameter optical tube AT60EDT to be used with optional guidescope rings as a photoguide for a larger telescope.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eTube finish:\u003c\/strong\u003e The optical tube is finished in a durable and subtly-textured white automotive-grade paint with black trim and a gray and black focuser.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eOther supplied accessories:\u003c\/strong\u003e A slip-on metal dust cap is standard. Two threaded holes for installing a finderscope mounting bracket are located on the upper side of the rotating focuser so you can install a finder on either the right or left side, as you prefer. \u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eShipping\/storage case:\u003c\/strong\u003e The scope comes in a 15.5\" x 10\" x 7.5\" aluminum-frame locking hard case with carry handle. The foam-fitted case has cutouts for the scope, a 1.25\" or 2\" star diagonal, and up to three eyepieces (two 1.25\" and one 2\").\u003cbr\u003eAstro-Tech is one of the very few manufacturers to provide a case at no charge for protection during shipping and as a storage convenience when the scope is not in use. Unfortunately, FedEx, UPS, and the Postal Service are very good at treating packages roughly. Occasionally, your scope can arrive in perfect condition, but with the walls of the shipping case dented in transit from rough handling, or the aluminum frame sprung, rendering the appearance of the case less than pristine. Damage to the shipping\/storage case in such instances is not covered by warranty.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eTwo year warranty:\u003c\/strong\u003e As an expression of the confidence Astronomy Technologies has in the quality of their products, the Astro-Tech AT60EDT is protected by a two-year limited warranty against flaws in materials and workmanship (shipping case excluded).\u003c\/p\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40481973338185,"sku":"AT60EDT","price":599.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/20001.jpg?v=1675378921"},{"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-60mm-photoguide-refractor","title":"Astro-Tech 60mm Photoguide Refractor OTA","description":"\u003cp\u003eThe new Astro-Tech AT60GS 60mm guidescope with upgraded helical focuser makes highly accurate autoguiding of deep space astrophotos affordable for any astrophotographer.  The Astro-Tech AT60GS 60mm fast focal ratio guidescope adds 10mm of aperture to its 50mm predecessor to allow guiding on fainter stars, plus a new rock-solid upgraded helical focuser to eliminate any possible play in the focuser over its entire travel range.\u003c\/p\u003e\n\u003cdiv\u003eThe Astro-Tech AT60GS guidescope refractor  is superb for guiding long-exposure DSLR and CCD astrophotos. It is usable with refractors and imaging Newtonians up to 1500mm in focal length, as well as longer focal length scopes, such as the 12\" Astro-Tech Ritchey-Chrétien astrographs.\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003eTaking deep space photos used to require tedious and error-prone manual guiding through a crosshair eyepiece and a large aperture, long focal length guidescope. However, the guiding accuracy of modern CCD autoguiders allows hands-free automatic guiding of long exposure photos through smaller guidescopes with much shorter focal lengths. Using an optically \"fast\" guidescope, such as the 60mm Astro-Tech AT60GS, you save valuable time, space, and money, while still recording the pin-point star images that only autoguiding can bring to long-exposure astrophotos.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe Astro-Tech AT60GS guidescope is a 60mm aperture 240mm focal length (f\/4) achromatic refractor with a helical focuser. The focuser can rotate as well to help you get the perfect framing.  It has dual mounting rings with nylon-tipped collimation screws (three per ring). The rings are attached to a riser block that uses a standard Vixen style mounting foot.  A vixen mounting shoe is included as well. Add an optional small-chip CCD autoguider, and you ready for automatic guiding.\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003eThe Astro-Tech AT60GS guidescope weighs only 20 ounces (30 ounces with the mounting rings and dovetail mounting bar). Its light weight lets you replace a heavier guidescope to gain a little breathing room with imaging setups that are pushing your mount's payload capacity. It measures 10.2\" (259mm) long with the focuser collapsed. With the focuser fully extended it measures 10.75\" long. A 48mm long fixed dew shield (with rubber dust cover) shields the fully multicoated cemented doublet lens from stray light.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe  Astro-Tech guidescope's helical focuser has a lock on the rotation for your CCD autoguider during focusing. The helical focuser simply moves the attached autoguider in or out while maintaining its set orientation. This ensures that the field of potential guide stars will not rotate when focusing.\u003c\/div\u003e\n\u003cdiv\u003e  \u003c\/div\u003e\n\u003cdiv\u003eThe focuser drawtube also has a lock on it so you can't accidentally change focuser during your guiding session.\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003eThe focuser terminates in a 1.25\" accessory holder for those guiders that have a fixed 1.25\" nose piece for connecting guider to guidescope. There are also male T-threads for a more solid and secure direct attachment of a guider whose nose piece can be removed to expose female T-threads for attachment to a guidescope.\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 style=\"max-width: 500px;\" id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e27 oz.\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\n\u003c\/div\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40481975730249,"sku":"AT60GS","price":139.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/astronomics_optimized-0076.jpg?v=1675379050"},{"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":"explore-scientific-102mm-f-7-essential-series-fcd-1-ed-triplet-refractor","title":"Explore Scientific 102mm f\/7 \"Essential Series\" FCD-1 ED Triplet Refractor","description":"\u003cp\u003eThis 102mm (4\") Explore Scientific \u003cem\u003eEssential Series\u003c\/em\u003e air-spaced ED triplet apochromatic refractor is loaded with quality optical performance at a surprisingly reasonable price for a scope of its size and optical quality.\u003c\/p\u003e\n\u003cdiv class=\"heading\"\u003eThis 4\" Explore Scientific ES102 \"Essential Series\" apochromatic refractor has:\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e\n\u003cul\u003e\n\u003cli\u003e102mm f\/7 fully multicoated triplet optics using a Hoya FPL51-equivalent ED element\u003c\/li\u003e\n\u003cli\u003eDual-speed 2\" rack and pinion focuser with 10:1 ratio fine focusing\u003c\/li\u003e\n\u003cli\u003eMounting rings with dovetail for use on a Vixen-style altazimuth or German equatorial mount\u003c\/li\u003e\n\u003cli\u003eFinderscope base installed on OTA\u003c\/li\u003e\n\u003cli\u003eExtended product lifetime warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003eThe Explore Scientific 4\" (102mm) aperture \"Essentials Series\" ES102 ED triplet refractor uses a premium Hoya ED glass element and state-of-the-art optical multicoatings in its apochromatic air-spaced ED triplet optics. The result is images that are essentially free of the annoying halo of unfocused violet light (chromatic aberration) that mars the view of bright stars and solar system objects in lesser scopes, despite the scope's relatively large aperture, and even at very high magnifications.\u003c\/p\u003e\n\u003cp\u003eThe Explore Scientific ES102 is a natural on an equatorial mount as the heart of your primary observing system. In addition, it's an excellent astrograph for serious wide field imaging, as well as crisp solar system imaging. Considering its lifetime warranty, its surprisingly reasonable price for a 4\" apochromatic triplet, and in view of the great optical performance that comes as standard equipment, the 4\" Explore Scientific ES102 is a terrific buy!\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures of this Telescope . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eED triplet refractor optics:\u003c\/strong\u003e 102mm (4\") aperture, 714mm focal length, f\/7 focal ratio three-lens air-spaced optical system. The optics use a center lens element of Hoya FCD1 (Dense Fluor Crown) glass, the Hoya equivalent of FPL-51 ED (Extra-low Dispersion) glass. This ED element produces superior sharpness and color correction by minimizing the chromatic aberration, the \"false\" color fringing seen around bright objects when light rays pass through standard crown-and-flint doublet objectives, particularly those with apertures in the ES102 class. The result is to reduce spurious color halos and fringing to vanishingly low levels.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFully multicoated optics:\u003c\/strong\u003e The ES102 triplet objective lens has EMD™ (Enhanced Multilayer Deposition) 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\u003eInternal light baffles:\u003c\/strong\u003e The aluminum tube body has contrast-enhancing internal light baffles and a specially darkened tube interior to provide dark sky backgrounds and high contrast.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCollimatable optics:\u003c\/strong\u003e One of the bonuses of owning a refractor is that, compared to standard reflector telescopes, they almost never require realigning of the optics (collimation). However, any air-spaced refractor telescope may require optical recentering if the lens elements are knocked out of alignment by a heavy blow during shipping or use. Removing the dew shield will give you access to the lens centering screws in the sides of the lens cell, which you can then adjust yourself by referring to the supplied instructions. You can also send your scope to Explore Scientific's Service Center for precision alignment. A standard service charge applies for factory realignment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDew shield:\u003c\/strong\u003e The supplied 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. A slip-on metal dust cap is standard.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDual speed 2\" rack and pinion focuser:\u003c\/strong\u003e The rotating precision-made no-backlash 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 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.\u003c\/p\u003e\n\u003cp\u003eThe focuser drawtube has a scale marked in centimeters and 1mm increments. This lets you note individual focuser positions for easy return to the correct focus when switching between visual use and photography. Lock knobs let you adjust the tension on the drawtube to accommodate varying eyepiece\/photo accessory loads, as well as firmly lock in a photographic focus. The focuser terminates in a non-marring 2\" compression ring accessory holder. Two 2\" draw tube extensions are included to let adjust the back focus when using a diagonal and eyepieces versus a camera.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMounting rings and dovetail:\u003c\/strong\u003e The ES102 has dual split mounting rings with a dovetail plate that fits the Vixen-style dovetail slot on the head of many of the most popular medium capacity German equatorial mounts. Such mounts include go-to mounts from Celestron and iOptron, among others. A spacer\/stabilizing bar on the top of the rings provides a carrying handle that makes it easy to transport the optical tube and install it on your equatorial mount. There is a mounting shoe for an optional finderscope installed on the body of the scope.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExtended lifetime warranty:\u003c\/strong\u003e This individually serial numbered Explore Scientific telescope is backed by a limited one year warranty, which will be extended to an Explore Scientific transferable Life of the Product limited warranty when its warranty card is registered with Explore Scientific within 60 days of purchase.\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\"\u003e4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e714mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTube Length w\/ Dew Shield\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e30.5\" (774mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTube Length w\/out Dew Shield\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e23.75\" (603mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e204x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTube Diameter\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e119mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e12 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDovetail\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eVixen\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1.14 arc seconds\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\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e\n\u003cp\u003e12.5\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1 year, extendable to lifetime\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\u003eDual tube rings with Vixen-style dovetail\u003c\/li\u003e\n\u003cli\u003e2\" dual speed rack and pinion focuser\u003c\/li\u003e\n\u003cli\u003eRetractable dew shield\u003c\/li\u003e\n\u003cli\u003eDust covers\u003c\/li\u003e\n\u003cli\u003eFinderscope base\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":40481976713289,"sku":"ES102B","price":999.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/ed102_b_854x854_4c39a1cf-2de3-43f1-ac91-a0da84a096c2.webp?v=1722007736"},{"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":"explore-scientific-152mm-f-8-fcd-1-ed-triplet-refractor-carbon-fiber-3-hex-rack-and-pinion-focuser","title":"Explore Scientific 152mm f\/8 FCD-1 ED Triplet Refractor, Carbon Fiber, 2.5\" Hex Rack And Pinion Focuser","description":"\u003cp\u003eThis big and optically excellent 152mm (6\") Explore Scientific air-spaced ED triplet apochromatic refractor has a carbon fiber body and a 2.5\" Hex rack and pinion focuser. It is superb for visual observing and long-exposure DSLR and CCD imaging.\u003c\/p\u003e\n\u003cdiv class=\"heading\"\u003eThis 6\" Explore Scientific ES152CF apochromatic carbon fiber refractor has:\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e• 152mm (6\") fully multicoated f\/8 apochromatic triplet optics using a Hoya FPL51-equivalent ED element\u003cbr\u003e• lightweight low thermal expansion carbon-fiber body\u003cbr\u003e• dual-speed 2.5\" HEX rack-and-pinion focuser with 2\" accessory holder\u003cbr\u003e• 2\" dielectric star diagonal with 2\" and 1.25\" brass compression ring eyepiece holders\u003cbr\u003e• dual split mounting rings with handle and Losmandy-style \"D-plate\" dovetail\u003cbr\u003e• extended lifetime warranty\u003c\/div\u003e\n\u003cdiv class=\"heading\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003eThe 6\" (152mm) aperture Explore Scientific ES152CF with 3\" HEX focuser uses a premium ED glass element and state-of-the-art optical multicoatings in its apochromatic air-spaced ED triplet optics. The result is visual and photographic images that are essentially free of the annoying halo of unfocused violet light (chromatic aberration) that mars the view of bright stars and solar system objects in lesser scopes, despite the scope's large aperture, and even at very high magnifications.\u003c\/p\u003e\n\u003cp\u003eThe body and dew shield of this 152mm Explore Scientific are made of high strength, low weight, low thermal expansion carbon fiber. This keeps the scope sharply focused as the ambient temperature changes during critical long-exposure CCD imaging.\u003c\/p\u003e\n\u003cp\u003eThis version of the Explore Scientific ES152CF is a natural on an equatorial mount as the heart of your observing system. In addition to it's superb visual images, it's an excellent astrograph for both serious wide field deep space imaging and crisp solar system imaging.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures of this Telescope . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eED triplet refractor optics:\u003c\/strong\u003e 152mm (6\") aperture, 1216mm focal length, f\/8 focal ratio three-lens air-spaced optical system. The optics use a center lens element of Hoya FCD1 (Dense Fluor Crown) glass, the Hoya equivalent of FPL-51 ED (Extra-low Dispersion) glass. This ED element produces superior sharpness and color correction by essentially eliminating chromatic aberration, the \"false\" color fringing seen around bright objects when light rays pass through standard crown-and-flint doublet objectives, particularly those with apertures in the 152mm class. The result is to reduce spurious color halos and fringing to vanishingly low levels for both imaging and visual use.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFully multicoated optics:\u003c\/strong\u003e The triplet objective lens of the ES152CF has EMD™ (Enhanced Multilayer Deposition) 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\u003eInternal light baffles:\u003c\/strong\u003e Contrast-enhancing internal light baffles and a specially darkened tube interior provide dark sky backgrounds and high terrestrial contrast.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCollimatable optics:\u003c\/strong\u003e One of the bonuses of owning a refractor is that, compared to standard reflector telescopes, they almost never require realigning of the optics (collimation). However, any air-spaced refractor telescope may require optical recentering if the lens elements are knocked out of alignment by a heavy blow during shipping or use. Removing the dew shield will give you access to the lens centering screws in the sides of the lens cell, which you can then adjust yourself by referring to the supplied instructions. You can also send your scope to Explore Scientific's Service Center for precision alignment. A standard service charge applies for factory realignment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCarbon fiber body:\u003c\/strong\u003e The body and dew shield of the 152mm Explore Scientific are made of woven carbon fiber fabric, encapsulated in epoxy. Carbon fiber, the same material used to fabricate much of the fuselage and wings of the new Boeing 787 Dreamliner passenger jet, has a high strength-to-weight ratio to keep the scope almost 20% lighter than comparable aperture aluminum-body scopes. In addition, it has low thermal expansion characteristics when subjected to temperature variations. This helps to keep the instrument sharply focused as the ambient temperature changes, which is particularly important during critical long-exposure CCD imaging.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDew shield:\u003c\/strong\u003e The supplied removable carbon fiber 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 there is excessive ambient light at night, such as a neighbor's backyard security light. A slip-on metal dust cap for the dew shield is standard.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDual speed 2.5\" HEX rack-and-pinion focuser:\u003c\/strong\u003e This version of the ES152CF uses a heavy-duty 2.5\" rack-and-pinion focuser from JOC (Junghua Optical Company, the parent company of Explore Scientific). This 2.5\" JOC has dual-speed focusing. There are two coarse focusing knobs. The right knob also has a smaller concentric knob with a 10:1 fine focusing ratio. This provides very 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.\u003c\/p\u003e\n\u003cp\u003eThe focuser can be rotated 360° for the best photographic composition without affecting the focus, which is locked in place with a large brass knob on the top of the focuser. Three large brass knobs lock the focuser at any desired rotational orientation. The focuser drawtube has a scale marked on both sides in centimeters and 1mm increments. This lets you note individual focuser positions for easy return to the correct focus when switching between visual use and photography. A knob underneath the focuser lets you adjust the tension on the built-in drawtube brake to accommodate varying eyepiece\/photo accessory loads.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e2\" dielectric star diagonal and compression ring eyepiece holders:\u003c\/strong\u003e The supplied standard equipment 2\" mirror star diagonal of the ES152CF slips into the 2.5\" focuser drawtube. The 2\" diagonal has 99% reflectivity dielectric mirror coatings for high light transmission. The star diagonal uses a non-marring soft brass compression ring to hold 2\" eyepieces in place. The compression ring won't scratch the barrel of your 2\" eyepieces as an ordinary thumbscrew can. A supplied 1.25\" accessory adapter slips into the 2\" diagonal to let you use 1.25\" eyepieces in the 2\" diagonal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMounting rings and dovetail:\u003c\/strong\u003e The ES152CF has dual split mounting rings mounted on a Losmandy-style \"D-plate\" dovetail that fits the Losmandy-style dovetail slot on the head of many of the most popular heavy duty German equatorial mounts. Such mounts include the Celestron CGEM DX and CGE Pro, the iOptron iEQ45, the Losmandy G11 and HGM Titan, and the Software Bisque Paramount MX go-to equatorial mounts, among others. A spacer\/stabilizing bar on the top of the rings provides a carrying handle that makes it easy to transport the optical tube and install it on your equatorial mount.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExtended lifetime warranty:\u003c\/strong\u003e This individually serial numbered Explore Scientific telescope is backed by a limited one year warranty, which will be extended to an Explore Scientific transferable lifetime limited warranty when its warranty card is registered with Explore Scientific within 60 days of purchase. \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\"\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\"\u003eGreat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1216\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\"\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e304x\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 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePlanetary Observation\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eGreat\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\u003eTelescope Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eRefractor\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, extendable to lifetime\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":40481977434185,"sku":"ES152C3","price":3999.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/vwb_1800x1800_f0fe874b-a156-45f3-8623-529931defbfe.jpg?v=1722009416"},{"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":"astro-tech-at115edt-f-7-ed-triplet-refractor-ota","title":"Astro-Tech AT115EDT f\/7 ED Triplet Refractor OTA","description":"\u003cp\u003eThere's a moment in every refractor owner's life when the view snaps into focus and the background goes black — truly black, the way only a well-corrected triplet delivers it — and whatever you're looking at just hangs there in space, pinpoint and still, with a clarity that makes you forget you're looking through glass at all. The AT115EDT is a 115mm f\/7 ED triplet that exists to deliver that moment, night after night, without costing what a premium APO costs. It won't do everything. It won't hunt down magnitude-14 galaxies or replace a 12-inch Dob for faint fuzzies. But for planets, the Moon, double stars, bright deep-sky, and serious astrophotography, it does what refractors do better than any other optical design — and at 115mm, it gathers over 27% more light than the 102mm refractors it often sits next to on the shelf.\u003c\/p\u003e\n\u003ch3\u003eThe Optics\u003c\/h3\u003e\n\u003cp\u003eTriplet apochromatic with an FK-61 ED center element — that's Schott's FPL-51 equivalent, slow-polished for smooth surfaces and low scattered light. Three lens elements, fully multicoated on all air-to-glass surfaces. The result is what refractor people are actually paying for: high contrast, pinpoint stars, and virtually no chromatic aberration at the focal plane. At 805mm focal length and f\/7, the AT115EDT is fast enough for efficient imaging but slow enough to be forgiving on eyepiece quality. The internal light baffles are knife-edge design, and the lens edges are blackened — both details that contribute to the deep, dark sky backgrounds this scope is known for.  Ed Ting's review on Cloudy Nights noted the AT115EDT delivered excellent views of planets, the Moon, and double stars — and called it a strong recommendation. \u003c\/p\u003e\n\u003ch3\u003eThe Focuser\u003c\/h3\u003e\n\u003cp\u003eThis is where the AT115EDT quietly separates itself from competitors in its price class. The 3.2\" dual-speed rack-and-pinion focuser has two coarse focusing knobs and a concentric 10:1 fine-focus microknob. Ninety-five millimeters of travel with a millimeter scale on the drawtube for repeatable photographic focus. A lock knob underneath holds your position. One Cloudy Nights member tested the focuser by loading a 2\" diagonal, a 28mm UWA eyepiece, and an actual brick onto the drawtube — 8.2 pounds total. He could position the focuser anywhere and it held, with the fine-focus knob still raising and lowering the load with precision. You will not need to do this. But knowing you could says something about the mechanical quality.\u003c\/p\u003e\n\u003cp\u003eThe focuser rotates a full 360° for camera framing — loosen the knob on top, rotate to your desired angle, tighten. The 2\" eyepiece holder includes a built-in camera angle adjuster for fine compositional tweaks without disturbing the heavier focuser body. Both 2\" and 1.25\" holders use compression rings, not thumbscrews, so your eyepiece and diagonal barrels stay unmarred. These are features that show up on scopes costing significantly more. On the AT115EDT, they're standard.\u003c\/p\u003e\n\u003ch3\u003eThe Tube and Rings\u003c\/h3\u003e\n\u003cp\u003eThe 114mm diameter optical tube is finished in white with grey anodized trim — clean, professional, durable. At 27.25\" long (32.4\" with the retractable dew shield extended), it's compact enough for travel and short enough to balance well on a mid-weight equatorial mount. Total weight with rings, handle, and Losmandy dovetail: 15.25 pounds. \u003c\/p\u003e\n\u003cp\u003eThe dual split hinged CNC tube rings are lined with white felt (not black, which can stain white tubes over time). A Losmandy-style dovetail bolts to the rings with a carry handle on top. Two Vixen-style finderscope shoes are mounted on the tube. A slip-on metal dust cap protects the objective, and a dust seal covers the eyepiece holder. The scope also has full collimation capability — three pairs of collimation screws sit under the silver collar at the back of the dew shield.\u003c\/p\u003e\n\u003ch3\u003eAstrophotography\u003c\/h3\u003e\n\u003cp\u003eAt f\/7 with 805mm of focal length, the AT115EDT is a serious imaging platform. The focal ratio is fast enough for reasonable exposure times on deep-sky targets but slow enough that stars stay tight across the field without a corrector for visual work. For imaging, pair it with the dedicated 0.8x reducer\/flattener to drop to f\/5.6 and 644mm — a faster, wider-field imaging configuration with a flat, corrected field across APS-C and full-frame sensors. A 1x field flattener is also available for full focal length imaging with flat stars to the corners.\u003c\/p\u003e\n\u003cp\u003eThe camera angle adjuster, compression rings, and rotatable focuser make photographic setup faster and more precise than scopes that lack these features. The focuser's 95mm of travel accommodates virtually any diagonal, camera, and accessory combination without running out of in-focus or needing extension tubes — a versatility that owners consistently praise.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAstro-Tech AT115EDT 115mm f\/7 ED triplet refractor OTA\u003c\/li\u003e\n\u003cli\u003eDual split hinged CNC tube rings with white felt lining\u003c\/li\u003e\n\u003cli\u003eLosmandy-style dovetail plate with carry handle\u003c\/li\u003e\n\u003cli\u003e2\" eyepiece holder with compression ring and camera angle adjuster\u003c\/li\u003e\n\u003cli\u003e1.25\" adapter with compression ring\u003c\/li\u003e\n\u003cli\u003eRetractable dew shield\u003c\/li\u003e\n\u003cli\u003eMetal dust cap and eyepiece holder dust seal\u003c\/li\u003e\n\u003cli\u003eSoft-sided heavy-duty nylon carry case with foam cutouts for 7 accessories\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e115mm (4.53\") FK-61 ED triplet optics\u003c\/strong\u003e — Over 27% more light-gathering than a 102mm refractor. Slow-polished triplet with fully multicoated surfaces for high contrast, pinpoint stars, and minimal chromatic aberration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.2\" dual-speed rack-and-pinion focuser\u003c\/strong\u003e — 10:1 fine-focus ratio, 75mm travel, mm scale, lock knob. Proven to hold 8+ pounds without slipping. The mechanical heart of the telescope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e360° rotatable focuser\u003c\/strong\u003e — Frame your camera or position your diagonal at any angle without moving the scope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in camera angle adjuster\u003c\/strong\u003e — Fine-tune composition without disturbing the focuser. Standard equipment, not an optional extra.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompression ring eyepiece holders\u003c\/strong\u003e — 2\" and 1.25\". No thumbscrews to mar your eyepiece or diagonal barrels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKnife-edge internal baffles\u003c\/strong\u003e — Deep contrast and dark sky backgrounds. Blackened lens edges reduce internal scatter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable dew shield\u003c\/strong\u003e — Slows dew formation and shields the objective from ambient light. Stores flat against the tube for transport.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLosmandy dovetail and CNC tube rings\u003c\/strong\u003e — White felt lined rings, carry handle. Ready for Losmandy and compatible saddles out of the box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoft carry case with accessory storage\u003c\/strong\u003e — Heavy-duty nylon case with paper pockets and foam cutouts for 7 accessories. Everything travels in one bag.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull collimation capability\u003c\/strong\u003e — Three pairs of collimation screws under the dew shield collar. You'll probably never need them, but they're there.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eUnder the Night Sky\u003c\/h3\u003e\n\u003cp\u003eJupiter at 160x (5mm eyepiece) in the AT115EDT shows the two main equatorial belts with festoons, barges, and the Great Red Spot as a definite salmon-colored oval — not just a smudge, but a feature with shape and internal structure on a steady night. Push to 200x on the best evenings and the belts begin to show scalloping and rifts. Four or five belts become visible at the limits of the seeing. The Galilean moons show disks, not points. The contrast of a well-corrected triplet makes the difference here — the belts are sharply defined against the zones, with none of the scattered light that softens the view in lesser optics.\u003c\/p\u003e\n\u003cp\u003eSaturn at 160x shows Cassini's Division as a clean dark gap, not a thin line. The shadow of the globe on the rings is crisp. The crepe ring is visible against the globe on transparent nights. Titan is obvious; two or three fainter moons show up with averted vision.\u003c\/p\u003e\n\u003cp\u003eThe Moon is where refractors earn their keep, and the AT115EDT delivers. At 200x, the terminator is alive with shadow detail — crater walls catching the first light, rilles threading across mare floors, the Straight Wall casting its knife-edge shadow. You're seeing the kind of sharpness and contrast that made refractors the instrument of choice for lunar and planetary observers for four centuries.\u003c\/p\u003e\n\u003cp\u003eDouble stars are a refractor specialty. Albireo splits into gold and blue at any magnification. Epsilon Lyrae — the Double Double — cleanly resolves all four components at 200x. At 1.01 arc seconds of resolution, the AT115EDT handles tight pairs that would challenge many 4-inch scopes.\u003c\/p\u003e\n\u003cp\u003eDeep-sky is real but bounded by aperture. The Ring Nebula (M57) shows its annular shape clearly. M13 resolves to individual stars across the face. The Andromeda Galaxy stretches across the field at low power with dark lanes visible on a good night. The Double Cluster in Perseus is a showpiece — dozens of stars scattered across the field with a clarity that only a refractor delivers. What you won't get: the faintest galaxies, the dimmest planetary nebulae, the deep structure in large faint objects. For that, supplement with a larger reflector. The AT115EDT is not trying to be everything. It's trying to be excellent at what refractors do best.\u003c\/p\u003e\n\u003ch3\u003eCommunity Says\u003c\/h3\u003e\n\u003cp\u003e\"It's difficult for me to consider another refractor that offers this much value. I am completely satisfied with the image quality of this well-built refractor. But most importantly, this refractor compares extremely well to some of the supposedly, more expensive refractors that I have owned and used.\" This owner's video review of the AT115EDT has been followed by 111 replies and widespread agreement from the Cloudy Nights community. — \u003ca href=\"https:\/\/www.cloudynights.com\/forums\/topic\/768782-astro-tech-at115edt-review-the-telescope-that-punches-way-above-its-price-range\/?do=findComment\u0026amp;comment=11065796\"\u003eCloudy Nights AT115EDT review thread\u003c\/a\u003e. This owner has experience with multiple refractors at higher price points.\u003c\/p\u003e\n\u003cp\u003e\"I am an AT loyalist because of the fine refractors I have always gotten from them. Every review I have seen of the AT115 is very positive.\" This owner chose the AT115EDT over an Askar 120 APO — not just for the price, but because of long-term trust in the Astro-Tech line. — \u003ca href=\"https:\/\/www.cloudynights.com\/forums\/topic\/941765-pulled-the-trigger-on-an-at115edt\/?do=findComment\u0026amp;comment=13757331\"\u003eCloudy Nights AT115EDT discussion\u003c\/a\u003e. This owner is a returning Astro-Tech customer.\u003c\/p\u003e\n\u003ch3\u003eObserving Tip\u003c\/h3\u003e\n\u003cp\u003eThe AT115EDT's 15.25 pounds puts it right on the edge of what many mid-weight mounts can handle well. An HEQ5\/EQ5-class mount will carry it for visual observing, but for imaging — especially with a camera, guidescope, and accessories — you'll want an EQ6 or Losmandy G11 class mount for stability. Match the mount to the job: if you're visual-only, the lighter mount saves setup time and backache. If you're imaging, don't compromise on mount capacity. The scope deserves a steady platform.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow does this compare to a 102mm ED refractor?\u003c\/strong\u003e\u003cbr\u003eThe AT115EDT gathers over 27% more light than a 102mm — that's a meaningful jump. You'll see fainter stars, resolve tighter doubles, and collect more signal in less time when imaging. At f\/7, the AT115EDT is also faster than most 102mm f\/7.8 or f\/8 doublets, which means shorter exposures for astrophotography. The dual-speed 3.2\" focuser, compression rings, and camera angle adjuster are features that many 102mm scopes at the same price don't include.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the FK-61 glass as good as FPL-53?\u003c\/strong\u003e\u003cbr\u003eDifferent, not lesser — for most uses. FK-61 (FPL-51 equivalent) in a triplet design provides excellent chromatic correction. You might see a faint violet halo on bright stars at high power that an FPL-53 or FCD-100 scope would eliminate. In imaging, it's a non-issue with narrowband or modern broadband filters. In visual use, most owners don't notice it under normal conditions. If absolute chromatic perfection is your priority, look at the AT150EDL (FCD-100 glass) or the AT72EDII (FPL-53 glass, smaller aperture). For the vast majority of observers, the FK-61 triplet gives you more aperture for your money — and more aperture means more resolution, more light, and more capability.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat mount do I need?\u003c\/strong\u003e\u003cbr\u003eFor visual observing: an HEQ5-class equatorial mount or a solid alt-az mount handles the AT115EDT well. Total payload with diagonal and eyepiece is around 17 pounds. For astrophotography: step up to an EQ6 or Losmandy G11 class mount to get the stability you need for guided long exposures. The Losmandy dovetail is included, so you're ready for Losmandy-compatible saddles out of the box.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat do I need for astrophotography with this scope?\u003c\/strong\u003e\u003cbr\u003eAt minimum: the scope, a sturdy equatorial mount with tracking, a camera (DSLR\/mirrorless or dedicated astronomy camera), and a field flattener or reducer\/flattener. The AT115EDT's 0.8x reducer\/flattener takes you to f\/5.6 and 644mm — faster and wider for deep-sky imaging. The 1x flattener keeps you at f\/7 and 805mm with flat stars to the corners. Dedicated CMOS and CCD astronomy cameras connect directly via 48mm T-threads; DSLR and mirrorless cameras need a T-ring for your specific mount (sold separately).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this OTA only? What else do I need?\u003c\/strong\u003e\u003cbr\u003eYes — no mount, eyepieces, diagonal, or finder are included. Plan on a 2\" star diagonal, a set of eyepieces (a 25mm for wide field, a 10mm for medium power, and a 4–5mm for planetary is a good starting trio), and a finderscope or red dot sight. If you're new to refractors, budget for the complete system. A telescope like the AT115EDT deserves quality accessories to match its optics.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it come with a case?\u003c\/strong\u003e\u003cbr\u003eYes — a soft-sided heavy-duty nylon carry case with paper pockets in the lid and foam cutouts for 7 accessories. The scope travels in one bag.\u003c\/p\u003e\n\u003ch3\u003eOptional Accessories\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAstro-Tech 2\" 99% Reflectivity Dielectric Mirror Diagonal\u003c\/strong\u003e — The companion diagonal for this scope. Dielectric coatings reflect more light than standard aluminum, and 2\" barrels handle the wider fields of view the AT115EDT can deliver.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAstro-Tech 0.8x Reducer\/Field Flattener for AT115EDT (Version II)\u003c\/strong\u003e — Drops the focal ratio to f\/5.6 and focal length to 644mm for faster, wider-field imaging with flat stars to the corners. Designed specifically for this scope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAstro-Tech 1x Field Flattener for AT115EDT\u003c\/strong\u003e — Full focal length, flat-field imaging at f\/7 and 805mm. For when you want the full reach of the telescope with corrected star shapes across the field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAstro-Tech V3 0.8x Reducer\/Field Flattener for AT115EDT with 3.2\" Focuser\u003c\/strong\u003e — The latest version, optimized for the 3.2\" focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAstro-Tech V3 1x Field Flattener for AT115EDT with 3.2\" Focuser\u003c\/strong\u003e — Full focal length flat field, V3 version for the 3.2\" focuser.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFinal Thoughts\u003c\/h3\u003e\n\u003cp\u003eThe AT115EDT is the refractor that Cloudy Nights members call \"the telescope that punches way above its price range\" — and after 56 reviews averaging 4.9 stars and an 846-reply owners thread that's still active four years in, the consensus is hard to argue with. It's 115mm of triplet APO with a focuser that holds a brick, optics that compare favorably to scopes at significantly higher prices, and a package of features — compression rings, camera angle adjuster, Losmandy dovetail, carry case — that most competitors charge extra for or skip entirely. It won't replace a 10-inch Dob for hunting the faintest deep-sky objects. It will show you planets, the Moon, double stars, and bright deep-sky with a clarity and contrast that no reflector at any price can match. If you've always wanted to know what the refractor fuss is about, this is where you find out.\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%;\"\u003eAperture\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e115mm (4.53\")\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;\"\u003e805mm\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;\"\u003eED triplet apochromatic (FK-61 center element)\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%;\"\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: #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;\"\u003e230x\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\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e1.01 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;\"\u003e12.8\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;\"\u003eDual-speed 3.2\" rack-and-pinion, 10:1 fine focus, 95mm travel\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 Rotation\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e360° rotatable\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%;\"\u003eCamera Angle Adjuster\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eBuilt-in (standard)\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%;\"\u003eEyepiece Holders\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e2\" and 1.25\" with compression rings\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 Diameter\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e114mm OD\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%;\"\u003eTube Length\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e27.25\" (32.4\" with dew shield extended)\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\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e15.25 lbs (OTA, rings, handle, Losmandy dovetail)\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%;\"\u003eDovetail\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eLosmandy style\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 Rings\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eDual split hinged CNC, white felt lined\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%;\"\u003eFinder Shoes\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eTwo Vixen-style\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;\"\u003eSoft-sided heavy-duty nylon with foam 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":40481978351689,"sku":"AT115EDT","price":1199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/AT115EDT_1-9463.jpg?v=1731697778"},{"product_id":"astro-tech-at130-edt-f-7-ed-triplet-ota","title":"Astro-Tech AT130 EDT f\/7 ED Triplet OTA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eFive inches of ED triplet aperture is where a refractor stops feeling small. The AT130EDT combines a 130mm f\/7 triplet objective, a heavy-duty 3.2-inch rack-and-pinion focuser, and a mechanical package built for serious visual observing and astrophotography. It's large enough to resolve fine planetary detail, gather meaningful light from distant galaxies, and support full imaging trains without compromise.\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eThe AT130EDT has earned its reputation through years of use by visual observers and astrophotographers alike. The optical design, focuser, and mechanical package work together as a complete system, making it one of the most versatile refractors Astro-Tech has ever offered.\u003c\/p\u003e\n\u003ch3\u003eThe Optical Design\u003c\/h3\u003e\n\u003cp\u003eThe AT130EDT is a three-element FK-61 ED triplet. The front objective is an apochromatic triplet with one ED (Extra Dispersed) element for color correction. All surfaces carry fully multicoated antireflection coatings, optimized for the specific glass types. The interior has multiple knife-edge baffles plus micro baffles in the drawtube, and the lens edges are blackened to control stray light. \u003cmeta charset=\"utf-8\"\u003eFK-61 is generally considered comparable in performance to Ohara FPL-51 when used in similar optical designs.\u003c\/p\u003e\n\u003cp\u003eThe mechanical assembly inside the tube is tight. FK-61 expansion from ambient temperature change is controlled by a precision cell that maintains optical alignment. The objective is sealed — dust, moisture, and temperature swings don't degrade performance over time. In the field, a 130mm triplet needs cool-down time like any refractor, but the thermal mass is manageable — expect 30 to 45 minutes before optics stabilize on a cool night. \u003cmeta charset=\"utf-8\"\u003eLike most 130mm triplets, the AT130EDT benefits from 30–45 minutes of thermal stabilization when moving from a warm environment into significantly cooler night air. The scope rewards both.\u003c\/p\u003e\n\u003ch3\u003eThe 3.2\" Rack-and-Pinion Focuser\u003c\/h3\u003e\n\u003cp\u003eThe AT130EDT focuser is a 3.2-inch (81mm) dual-speed rack-and-pinion mechanism with a concentric 10:1 fine-focus knob — the coarse knob and the fine knob are concentric on the same axis, so you can move between coarse and fine without moving your hand. Travel is smooth and repeatable across the full 85mm range. The drawtube itself is marked in millimeter increments for recording focus positions and for matching backfocus on cameras.\u003c\/p\u003e\n\u003cp\u003eThe focuser's 3.2-inch drawtube accepts a large variety of connection systems and handles heavy imaging loads without flexure or image shift. The current production focuser terminates in M92 threads, which connect directly to the AT130EDTRFv3 reducer\/flattener or to a T-ring for standard DSLR\/mirrorless camera work. Older AT130EDT models (pre-2023) used a 2.5-inch focuser with M63 threads — if you're matching a reducer to an older scope, you need the ATREDT30V2, not the newer v3. The two are not interchangeable.\u003c\/p\u003e\n\u003cp\u003eBuilt into the focuser is a camera angle adjuster — a rotating collar that lets you frame your target in landscape, portrait, or any angle between without disassembling the imaging train. A large locking knob keeps rotation steady. This is the feature that saves imaging sessions on nights when framing matters or when you're working in tight spaces with multiple cameras on a multi-scope setup.\u003c\/p\u003e\n\u003ch3\u003eBuilt for the Field\u003c\/h3\u003e\n\u003cp\u003eThe AT130EDT weighs 18.5 pounds with the optical tube and its internal cell, plus mounting rings. With dovetail and carry handle, you're moving about 22 pounds — heavy enough to be a serious optical system, light enough that a single person carries it without strain from car to telescope pad. The scope is 27.5 inches long retracted, and 31 inches with the dew shield extended. \u003c\/p\u003e\n\u003cp\u003eThe mounting system is built to match. Hinged split tube rings with felt linings let you remove and reposition the scope without tools — a practical advantage for equipment swaps or for repositioning the tube during a long session to reach targets at difficult azimuths. The Losmandy-style dovetail plate is rigid and well-indexed, and it's compatible with most saddle plates in that size class. The carry handle has multiple functions: you lift the scope with it, you store accessories and eyepieces in it, and you can mount a guide scope or off-axis guider to it.\u003c\/p\u003e\n\u003cp\u003eThe retractable dew shield extends 4 inches from the objective cell and stores flush against the tube when retracted. In humid conditions, it's a genuine advantage — dew control is easier, and the shield also reduces stray light from overhead sources. For transport, it stows into less than 2 inches of additional length.\u003c\/p\u003e\n\u003cp\u003eThe included nylon carrying case is a first-class protection layer for the optics tube. It's designed with padding on the interior, latches that hold firm, and handles for single-person carry. From backyard to dark sky site, this case has earned its place in the box.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAstro-Tech AT130EDT 130mm f\/7 FK-61 ED triplet refractor OTA\u003c\/li\u003e\n\u003cli\u003eHinged split tube rings (felt-lined) with Losmandy-style dovetail plate\u003c\/li\u003e\n\u003cli\u003eCarry handle with mounting points for accessories\u003c\/li\u003e\n\u003cli\u003e2\" accessory holder with non-marring brass compression ring\u003c\/li\u003e\n\u003cli\u003e1.25\" accessory adapter with non-marring brass compression ring\u003c\/li\u003e\n\u003cli\u003eRetractable self-storing dew shield\u003c\/li\u003e\n\u003cli\u003eNylon carrying case\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\u003e130mm f\/7 FK-61 ED triplet with three-element design.\u003c\/strong\u003e Apochromatic triplet correction brings all three primary colors to the focal plane, eliminating false color. FK-61 is a Schott glass equivalent to FPL-51 — not FPL-53, but proven excellent in triplet configurations. All surfaces fully multicoated.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e910mm focal length — long enough for planetary and galaxy detail, wide enough for moderate deep-sky framing.\u003c\/strong\u003e At 910mm on a full-frame or APS-C sensor, you frame the Orion Nebula complex or a single large galaxy in landscape orientation. Add the dedicated reducer and open to roughly 1.8× wider field at f\/5.6.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.2\" dual-speed rack-and-pinion focuser with 10:1 fine focus and camera angle adjuster.\u003c\/strong\u003e The largest focuser in the EDT line handles heavy imaging trains without flexure. Drawtube rotation lets you frame targets in any orientation. M92 threads (current production) connect directly to the reducer\/flattener or T-ring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultiple knife-edge baffles plus micro baffles in the drawtube for stray-light suppression.\u003c\/strong\u003e Dark tube interior, blackened lens edges, and rigorous internal design deliver high-contrast views on planets and nebulae.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHinged split tube rings with Losmandy-style dovetail and carry handle.\u003c\/strong\u003e Mount or unmount the scope without tools. Rigid enough for serious imaging work. Practical enough for backyards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable dew shield with self-storing design.\u003c\/strong\u003e Extends 4 inches for dew protection and stray-light control in humid conditions. Retracts to minimal footprint for transport.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNylon carrying case included.\u003c\/strong\u003e Padded protection for transport and storage. Single-person carry from the equipment shed to the dark sky site.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhite tube with Aston Martin Grey focuser and trim.\u003c\/strong\u003e Clean, professional finish that photographs well and reduces glint when imaging in twilight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible with dedicated reducer\/flattener options.\u003c\/strong\u003e Pair with the AT130EDTRFv3 (M92 threads, current) or ATREDT30V2 (M63 threads, older models) to drop from 910mm f\/7 to 728mm f\/5.6. Also available: AT130EDTFFv3 1× field flattener for flatness optimization in full-frame imaging.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eUnder the Night Sky\u003c\/h3\u003e\n\u003cp\u003e130mm of aperture in a well-corrected triplet is a working aperture — big enough to see fine detail, small enough to go places. The Dawes diffraction limit is 0.89 arc seconds. The visual limiting magnitude is 13.2. In good conditions at a reasonably dark site, you're finding galaxies that challenge smaller scopes and planets that reward high magnification.\u003c\/p\u003e\n\u003cp\u003eOn the Moon, the AT130EDT shows terraced crater walls, central peaks, and fine rille structure across the entire disc. The terminator reveals texture — Copernicus at 150× shows its terraced ramparts clearly, the Straight Wall is a clean shadow line, and Aristarchus glows like a torch. The lack of false color means the Moon stays crisp and bright-looking even at high power. A 4mm eyepiece at 228× on the Moon is a memorable session — planetary detail you don't forget.\u003c\/p\u003e\n\u003cp\u003ePlanets respond well to 130mm of aperture in this focal ratio. Mars shows polar caps, surface markings, and subtle cloud structure when the opposition position is favorable. Jupiter's Great Red Spot is prominent, and the Cassini Division on Saturn is visible at moderate power under decent seeing. \u003cmeta charset=\"utf-8\"\u003eVenus displays clean crescent phases with excellent color correction. The triplet design keeps the disc contrast high — no magenta or cyan haloes diluting the view.\u003c\/p\u003e\n\u003cp\u003eDouble stars separate cleanly. At 0.89 arc seconds, the AT130EDT splits tight optical pairs that smaller scopes need dark adaptation or averted vision to resolve. Castor resolves at moderate power (5.6 arc seconds). Epsilon Lyrae separates at 150×. Rigel shows its 7th-magnitude companion 9.4 arc seconds away — a test of true contrast, not just resolution. Albireo at low power is a striking color-contrast pair with no false color to mar the view.\u003c\/p\u003e\n\u003cp\u003eDeep sky through a triplet refractor is a different experience than through a reflector or a doublet. The flat field and the high contrast from the triplet design mean you see nebulae with good definition and clusters with sharp stars to the edge of the field. M42 (Orion Nebula) shows fine internal structure — not just the main nebular cloud, but the Running Man nebulosity and the background emission. The Rosette Nebula appears as a full ring structure at low power on dark nights. M31 (Andromeda) spans an impressive width, with dust lane detail visible in good conditions. Messier open clusters — M13, M35, M36, M37, M38 — pop with detail. The lack of a central obstruction means stars appear as clean points rather than diffraction-ring-crossed discs.\u003c\/p\u003e\n\u003ch3\u003eCommunity Says\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\"The AT130EDT has been my workhorse for two years. Serious planetary detail, excellent for galaxies, and the build quality feels like it will outlast me.\"\u003c\/strong\u003e\u003cbr\u003eThis owner paired the scope with a ZWO AM5 mount and has logged over 150 hours split between visual observing sessions and astrophotography nights on deep-sky targets. The user flagged the 3.2-inch focuser as a deciding factor for handling heavy camera and filter-wheel combinations without flex.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\"For the price, this is the scope that keeps winning. I've compared it to much more expensive triplets and the optics hold their ground. Cool-down takes time, but you plan for it and forget about it.\"\u003c\/strong\u003e\u003cbr\u003eThis owner uses the AT130EDT for both planetary imaging and visual observation, and notes that the triplet color correction on high-magnification planetary work is cleaner than what they'd expected at the price point. The user specifically praised the mechanical rigidity under heavier imaging loads.\u003c\/p\u003e\n\u003ch3\u003eObserving Tip\u003c\/h3\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eWhile the AT130EDT is fully capable of high-magnification planetary observing, many owners discover its greatest strength is versatility. Spend the early part of an evening exploring large nebulae and open clusters at lower power, then move to planets, double stars, and globular clusters as the telescope reaches thermal equilibrium. A 130mm triplet rewards observers who use the full range of what the aperture can offer.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the AT130EDT compare to the AT125EDL doublet?\u003c\/strong\u003e\u003cbr\u003eDifferent design philosophies at similar apertures and focal length. The AT130EDT is a 130mm f\/7 FK-61 triplet with a 3.2-inch focuser and Losmandy dovetail. The AT125EDL is a 125mm f\/7.8 FCD-100 (premium glass) doublet with a 2.5-inch focuser and Vixen dovetail. The triplet design has one advantage in color correction — all three primary colors are brought into coincidence at the focal plane, which shows as crisper contrast on planets. The doublet at FCD-100 quality has a smaller thermal mass and cools faster (25-30 minutes vs. 35-45 minutes for the triplet). The triplet has more aperture and a larger focuser for heavier imaging trains. The doublet has more premium glass and fits lighter mounts. Both are excellent scopes. \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich reducer or flattener do I need?\u003c\/strong\u003e\u003cbr\u003eIt depends on your focuser version. If your AT130EDT has the 3.2-inch focuser with M92 threads (current production, 2023 onward), you need the AT130EDTRFv3 reducer\/flattener. If you have an older AT130EDT with the 2.5-inch focuser and M63 threads, you need the ATREDT30V2. They have different thread sizes and are not interchangeable. Check your focuser drawtube carefully — the thread size is marked. The field flattener option is the AT130EDTFFv3 (1×), which is a flattening optic only, not a focal-length changer.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat mount does this scope need?\u003c\/strong\u003e\u003cbr\u003eThe AT130EDT at roughly 22 pounds (with rings and dovetail) needs a mount rated for at least 35 pounds of payload for astrophotography — you need headroom above the tube weight to handle cameras, off-axis guiders, filter wheels, and dew heaters without the mount straining. For visual use, an equatorial mount rated for 30+ pounds works well. The Losmandy dovetail suggests compatibility with heavy-duty mounts — a ZWO AM5, an iOptron CEM60, a Skywatcher HEQ6, or an older Losmandy mount in that weight class. A lighter mount will work for visual observation but will flex noticeably under a heavy imaging camera. Plan on a mount that is overkill for the visual package — you'll thank yourself when you load cameras.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this good for astrophotography?\u003c\/strong\u003e\u003cbr\u003eThe AT130EDT is one of the most popular imaging refractors in the Astro-Tech line — it shows up regularly in astrophotography forums and imaging equipment discussions because it delivers. The 3.2-inch focuser handles heavy camera systems without flexure. The rotatable drawtube and camera angle adjuster simplify field rotation and framing. At 910mm f\/7 on a full-frame or APS-C sensor, you frame larger nebulae and galaxies well. With a reducer, you drop to 728mm f\/5.6 for faster exposures and a wider field. The triplet design is favorable for imaging — color correction is flat across the field, which means less post-processing correction needed. Pair it with a quality mount, a guide scope, and a good camera, and you have a capable imaging platform.\u003c\/p\u003e\n\u003ch3\u003eOptional Accessories\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAT130EDTRFv3 0.8× Reducer\/Flattener (M92 threads):\u003c\/strong\u003e Converts the AT130EDT from 910mm f\/7 to 728mm f\/5.6 with a corrected flat field. For current-production scopes with the 3.2-inch focuser. If you have an older AT130EDT with the 2.5-inch focuser, you need the ATREDT30V2 instead — they are not interchangeable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAT130EDTFFv3 1× Field Flattener:\u003c\/strong\u003e Maintains the native 910mm focal length while correcting field curvature for flat, sharp stars to the edges of your sensor. The right choice when you want the full image scale without reducing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAstro-Tech 2\" 99% Reflectivity Dielectric Mirror Diagonal:\u003c\/strong\u003e A quality diagonal matters at this level. Dielectric coating delivers near-total reflectivity — you won't lose light to the diagonal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAstro-Tech 13mm 100° Field Waterproof Eyepiece:\u003c\/strong\u003e At 910mm focal length, the 13mm delivers 70× with a 100° apparent field — a superb deep-sky eyepiece that frames the larger nebulae and clusters with walk-through-space immersion.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFinal Thoughts\u003c\/h3\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eThe AT130EDT occupies one of the most desirable positions in the refractor world: enough aperture to be genuinely powerful, enough portability to travel easily, and enough mechanical capability to support serious astrophotography. That's why it continues to earn a loyal following among observers and imagers alike.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; height: 1107.09px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: rgb(240, 244, 248); height: 19.5938px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 19.5938px;\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 19.5938px;\"\u003eAstro-Tech AT130EDT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(255, 255, 255); height: 39.1875px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 39.1875px;\"\u003eOptical Design\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 39.1875px;\"\u003eED Triplet (3-element), fully multicoated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(240, 244, 248); height: 19.5938px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 19.5938px;\"\u003eAperture\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 19.5938px;\"\u003e130mm (5.1\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(255, 255, 255); height: 19.5938px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 19.5938px;\"\u003eFocal Length\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 19.5938px;\"\u003e910mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(240, 244, 248); height: 19.5938px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 19.5938px;\"\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 19.5938px;\"\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(255, 255, 255); height: 39.1875px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 39.1875px;\"\u003eGlass Type\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 39.1875px;\"\u003eFK-61 (Schott FPL-51 equivalent) — NOT FPL-53\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(240, 244, 248); height: 39.1875px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 39.1875px;\"\u003eCoatings\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 39.1875px;\"\u003eFully multicoated on all air-to-glass surfaces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(255, 255, 255); height: 58.7812px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 58.7812px;\"\u003eInternal Baffling\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 58.7812px;\"\u003eMultiple knife-edge baffles, micro baffles in drawtube, blackened lens edges\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(240, 244, 248); height: 19.5938px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 19.5938px;\"\u003eDawes Diffraction Limit\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 19.5938px;\"\u003e0.89 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(255, 255, 255); height: 19.5938px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 19.5938px;\"\u003eVisual Limiting Magnitude\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 19.5938px;\"\u003e13.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(240, 244, 248); height: 39.1875px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 39.1875px;\"\u003eFocuser\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 39.1875px;\"\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: rgb(255, 255, 255); height: 19.5938px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 19.5938px;\"\u003eFocuser Travel\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 19.5938px;\"\u003e85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(240, 244, 248); height: 39.1875px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 39.1875px;\"\u003eFocuser Threads (Current)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 39.1875px;\"\u003eM92 (drawtube), connects to AT130EDTRFv3 reducer or T-ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(255, 255, 255); height: 58.7812px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 58.7812px;\"\u003eFocuser Threads (Older)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 58.7812px;\"\u003eM63 (pre-2023 models), connects to ATREDT30V2 reducer. NOT interchangeable with M92 models.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(240, 244, 248); height: 19.5938px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 19.5938px;\"\u003eCamera Angle Adjuster\u003c\/td\u003e\n\u003ctd style=\"width: 50%; height: 19.5938px;\"\u003eBuilt-in, 360° rotation with locking knob\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(255, 255, 255); height: 39.1875px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 39.1875px;\"\u003eAccessory Holders\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 39.1875px;\"\u003e2\" and 1.25\" with non-marring brass compression rings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(240, 244, 248); height: 19.5938px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 19.5938px;\"\u003eDew Shield\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 19.5938px;\"\u003eRetractable self-storing, extends 4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(255, 255, 255); height: 19.5938px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 19.5938px;\"\u003eOTA Length (retracted)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 19.5938px;\"\u003e27.5\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(240, 244, 248); height: 19.5938px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 19.5938px;\"\u003eOTA Length (dew shield extended)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 19.5938px;\"\u003e31\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(255, 255, 255); height: 19.5938px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 19.5938px;\"\u003eOptical Tube Weight\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 19.5938px;\"\u003e18.5 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(240, 244, 248); height: 39.1875px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 39.1875px;\"\u003eTotal Weight (with rings, dovetail, handle)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 39.1875px;\"\u003e22 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(255, 255, 255); height: 39.1875px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 39.1875px;\"\u003eTube Finish\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 39.1875px;\"\u003eWhite anodize with Aston Martin Grey focuser and appointments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(240, 244, 248); height: 39.1875px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 39.1875px;\"\u003eMounting Rings\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 39.1875px;\"\u003eHinged split rings (felt-lined) with M6×1 mounting holes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(255, 255, 255); height: 19.5938px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 19.5938px;\"\u003eDovetail\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 19.5938px;\"\u003eLosmandy-style, rigid and well-indexed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(240, 244, 248); height: 39.1875px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 39.1875px;\"\u003eCompatible Reducer (current focuser)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 39.1875px;\"\u003eAT130EDTRFv3 with M92 threads → 728mm f\/5.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(255, 255, 255); height: 58.7812px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 58.7812px;\"\u003eCompatible Reducer (older focuser)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 58.7812px;\"\u003eATREDT30V2 with M63 threads → 728mm f\/5.6 (NOT interchangeable with v3)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(240, 244, 248); height: 166.594px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 166.594px;\"\u003eField Flattener Option\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 166.594px;\"\u003eAT130EDTFFv3 (1× flattener only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(255, 255, 255); height: 39.1875px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 39.1875px;\"\u003eCool-Down Time (expected)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 39.1875px;\"\u003e35-45 minutes on a cool night for thermal equilibrium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(240, 244, 248); height: 39.1875px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 39.1875px;\"\u003eCarry Case\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 39.1875px;\"\u003eNylon with padding and latches, single-person carry\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(255, 255, 255); height: 19.5938px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 19.5938px;\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 19.5938px;\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(240, 244, 248); height: 19.5938px;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); font-weight: bold; width: 50%; height: 19.5938px;\"\u003eWarranty\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid rgb(204, 204, 204); height: 19.5938px;\"\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":40481978384457,"sku":"AT130EDT","price":1649.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/AT130EDT_1-9453_df05fdf3-cb5b-4394-88c5-c23fd6d403c6.jpg?v=1739225361"},{"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":"sky-watcher-skymax-102-102mm-f-12-75-maksutov-cassegrain-optical-tube","title":"Sky-Watcher Skymax 102 102mm f\/12.75 Maksutov-Cassegrain Optical Tube S11510","description":"\u003cp\u003eThe Sky-Watcher 102mm Maksutov-Cassegrain is an inexpensive step up from a 90mm Mak. This compact optical powerhouse is capable of producing sharp, high contrast images inside the solar system and out.\u003c\/p\u003e\n\u003cp\u003eThis 102mm (4\") Sky-Watcher Maksutov-Cassegrain is an inexpensive step-up from a 90mm Maksutov. It costs less than 20% more than a 90mm Mak, but has 30% more light gathering. Resolution of the 102mm is 14% higher than a 90mm Mak, as well.\u003c\/p\u003e\n\u003cp\u003eLike all Maksutov-Cassegrain telescopes, such as the ultra-premium Questars, the 102mm Sky-Watcher is designed for observing anything that is small and distant and needs a lot of power to resolve clearly. Its Maksutov-Cassegrain folded optical system provides sharp, high contrast images - mountains and craters on the Moon; major surface details on Mars; multiple storm bands on Jupiter; even Cassini's Division in the rings of Saturn occasionally pops into view in good seeing conditions.\u003c\/p\u003e\n\u003cp\u003eOutside the solar system, the high resolution 102mm Sky-Watcher splits close binary stars, resolves open star clusters, begins to reveal the brighter nebulas and galaxies, and more. It can also be used as a very high performance terrestrial spotting scope.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures of this 102mm Sky-Watcher Maksutov-Cassegrain . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMaksutov-Cassegrain optics:\u003c\/strong\u003e 4\" (102mm) aperture, 1300mm focal length, f\/12.75 optical system. The system's Maksutov corrector lens is fully multi-coated on both sides with multiple layers of anti-reflection materials for high light transmission and good contrast.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInternal focuser:\u003c\/strong\u003e Focuses by moving the primary mirror fore and aft in the optical tube by means of a large focusing knob on the rear cell.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStar diagonal:\u003c\/strong\u003e 1.25\" 90°.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTwo 1.25\" eyepieces:\u003c\/strong\u003e The first is a 25mm Plössl providing 52x. The eyepiece field of view is nearly 1° across, twice the diameter of the full Moon, for expansive views of the Moon, star clusters, and terrestrial observing. The second is a 10mm Plössl providing 130x for close-up views of the Moon and planets, globular star clusters, binary stars and more.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFinder:\u003c\/strong\u003e illuminated red dot finder. The red dot finder is a quick and easy way to point your telescope exactly to the desired object in the sky. There's no need to worry about the inverted images you see through traditional finders. Just align the red dot seen in the finder with the desired object and you're done.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDovetail:\u003c\/strong\u003e Vixen-style dovetail for installing the scope on any altazimuth or equatorial mount that uses a Vixen-style saddle.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWarranty:\u003c\/strong\u003e two years.\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\"\u003e4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1300mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/12.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeaviest Single Component\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e6 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e186x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e6 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1.14 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVisual Limiting Magnitude\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e12.5\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\u003eS11510\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e050234115100\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\u003eMak-Cass\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\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\/Borosilicate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTrue Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e101.93\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e102\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eF\/Ratio\u003c\/td\u003e\n\u003ctd\u003e12.7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length (mm)\u003c\/td\u003e\n\u003ctd\u003e1300\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Diameter\u003c\/td\u003e\n\u003ctd\u003e31mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Obstruction (by diameter)\u003c\/td\u003e\n\u003ctd\u003e30%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Obstruction by Area\u003c\/td\u003e\n\u003ctd\u003e9%\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\u003e1.14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRayleigh Limit\u003c\/td\u003e\n\u003ctd\u003e1.37\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Mag.\u003c\/td\u003e\n\u003ctd\u003e12.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Magnification\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Magnification\u003c\/td\u003e\n\u003ctd\u003e201\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering (compared to next size down)\u003c\/td\u003e\n\u003ctd\u003e28%\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\u003ePrimary Mirror\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Length (Retract\/Ext.)\u003c\/td\u003e\n\u003ctd\u003e12.25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e4.625\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight (with accessories)\u003c\/td\u003e\n\u003ctd\u003e4.6\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\u003eRed Dot\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Diagonal\u003c\/td\u003e\n\u003ctd\u003e1.25\" Star Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Accessories\u003c\/td\u003e\n\u003ctd\u003eV-Rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Eyepieces\u003c\/td\u003e\n\u003ctd\u003e25\/10 Wide Angle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification w\/ Included Eyepieces\u003c\/td\u003e\n\u003ctd\u003e52x\/130x\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\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":40481978908745,"sku":"S11510","price":355.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/Skymax102_Main_1800x1800_485b8365-ea29-4380-9a81-7f4a60ac0f44.webp?v=1723143248"},{"product_id":"sky-watcher-skymax-127-127mm-f-11-8-maksutov-cassegrain-optical-tube","title":"Sky-Watcher Skymax 127  f\/11.8 Maksutov-Cassegrain Optical Tube","description":"\u003cp\u003eThe Sky-Watcher 127mm Maksutov-Cassegrain folded optical system is a compact optical powerhouse capable of producing sharp, high contrast images inside the solar system and out.\u003c\/p\u003e\n\u003cp\u003eThis 127mm (5\") aperture Sky-Watcher Maksutov-Cassegrain provides exceptional high contrast\/high resolution solar system images at a very sensible price. You can see the phases of Mercury and Venus; lunar rilles and craters less than three miles across; Martian polar caps and major dark surface features; cloud belts on Jupiter, with some detail in the belts, plus the shadows of Jupiter's moons on the planet during transits; Cassini's division in Saturn's rings on a regular basis, plus four or five of its moons; and Uranus and Neptune visible as very small discs.\u003c\/p\u003e\n\u003cp\u003eOutside the solar system, the high resolution 127mm Sky-Watcher will show you dozens of globular clusters, emission nebulas, planetary nebulas, and galaxies; all of the Messier objects and many of the brighter NGC objects from a dark sky site (with some internal detail visible in many nebulas, although most galaxies will remain relatively featureless hazy patches). It can also be used as a very high performance terrestrial spotting scope.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures of this 127mm Sky-Watcher Maksutov-Cassegrain . . .\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMaksutov-Cassegrain optics:\u003c\/strong\u003e 5\" (127mm) aperture, 1500mm focal length, f\/11.8 optical system. The system's Maksutov corrector lens is fully multi-coated on both sides with multiple layers of anti-reflection materials for high light transmission and good contrast.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInternal focuser:\u003c\/strong\u003e Focuses by moving the primary mirror fore and aft in the optical tube by means of a large focusing knob on the rear cell.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStar diagonal:\u003c\/strong\u003e 2\" 90° mirror type.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e2\" eyepiece:\u003c\/strong\u003e The 2\" 54x eyepiece is a fully multi-coated three-element Sky-Watcher 28mm LET design with a long 20mm eye relief and a twist-up eyecup. The eyepiece field of view is little over 1° across, more than twice the diameter of the full Moon, for expansive views of the Moon, nebulas, and globular star clusters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFinder:\u003c\/strong\u003e 6 x 30mm straight-through dark crosshair achromatic refractor.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDovetail:\u003c\/strong\u003e Vixen-style dovetail for installing the scope on any altazimuth or equatorial mount that uses a Vixen-style saddle.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWarranty:\u003c\/strong\u003e two years.\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\"\u003e5\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1500mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd class=\"data\"\u003ef\/11.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHighest Useful Magnification\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e250x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e9.7 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResolution\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.91 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\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\u003eS11520\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e050234115209\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\u003eMak-Cass\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\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\/Borosilicate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e127\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eF\/Ratio\u003c\/td\u003e\n\u003ctd\u003e12.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length (mm)\u003c\/td\u003e\n\u003ctd\u003e1540\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Diameter\u003c\/td\u003e\n\u003ctd\u003e39mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Obstruction (by diameter)\u003c\/td\u003e\n\u003ctd\u003e31%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Obstruction by Area\u003c\/td\u003e\n\u003ctd\u003e9%\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\u003e0.91\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRayleigh Limit\u003c\/td\u003e\n\u003ctd\u003e1.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Mag.\u003c\/td\u003e\n\u003ctd\u003e13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Magnification\u003c\/td\u003e\n\u003ctd\u003e18\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Magnification\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering (compared to next size down)\u003c\/td\u003e\n\u003ctd\u003e55%\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\u003ePrimary Mirror\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Length (Retract\/Ext.)\u003c\/td\u003e\n\u003ctd\u003e15\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e5.75\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight (with accessories)\u003c\/td\u003e\n\u003ctd\u003e9.7\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\u003e2\" Star Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Accessories\u003c\/td\u003e\n\u003ctd\u003eV-Rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Eyepieces\u003c\/td\u003e\n\u003ctd\u003e28 LET\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification w\/ Included Eyepieces\u003c\/td\u003e\n\u003ctd\u003e55x\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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":40481978941513,"sku":"S11520","price":610.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/RS1356_S11520_Skymax127_OTAOnly_Front_NoBackground-scr_1800x1800_f2f42e0b-d20b-4f7a-a26d-4e8c55a43d37.webp?v=1723145376"}],"url":"https:\/\/astronomics.com\/collections\/ota.oembed?page=10","provider":"Astronomics","version":"1.0","type":"link"}