{"title":"2\" Eyepieces","description":null,"products":[{"product_id":"30mm-xw-extra-wide-angle-2-eyepiece","title":"Pentax 30mm XW Extra Wide Angle 2\" Eyepiece","description":"\u003cp\u003eThis medium focal length 2\" Pentax eyepiece is an excellent choice for medium power deep space observing with long focal length refractors, reflectors, or catadioptric scopes that have a 2\" focuser or star diagonal. It is a superb low power eyepiece with short focal length refractors and fast focal ratio reflectors. An f\/4.5 Dobsonian reflector, for example, will yield a 6.7mm exit pupil, close to the largest usable for bright images of emission nebulas and galaxies. Its sharpness across the wide 70° field makes open star clusters and large nebulas vivid and nearly three-dimensional. The 650mm focal length TMB-105 triplet apo refractor provides 22x, a 6mm exit pupil, and a 3.2-degree field (almost seven times as wide as the Moon). These figures are all virtually perfect for observing open clusters such as the Pleiades; large nebulas such as the Lagoon, Veil, and Orion; large globulars such as M-13 and Omega Centauri; and large galaxies such as M-31 and M-33. All fit easily into the field of view, with a spacious framework of black velvet sky around them to set off their subtleties.\u003c\/p\u003e\n\u003cp\u003eThe long 20mm eye relief is ideal for those who \u003cem\u003emust \u003c\/em\u003e wear eyeglasses while observing due to astigmatism. Even those who do not wear glasses will find the long eye relief a comfortable change from the cramped eye relief that is typical of the usual short focal length eyepiece.\u003c\/p\u003e\n\u003cp\u003eThe substantial 26 oz. weight of the eyepiece may require rebalancing of some Dobsonians if you switch between this 2\" eyepiece and a lighter 1.25\" eyepiece.\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e70\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e30mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e26.1 oz\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","brand":"Pentax","offers":[{"title":"Default Title","offer_id":40221632954441,"sku":"PXW30","price":496.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/XW30.png?v=1722974963"},{"product_id":"40mm-xw-extra-wide-angle-2-eyepiece","title":"Pentax 40mm XW Extra Wide Angle 2\" Eyepiece","description":"This long focal length 2\" Pentax eyepiece is outstanding for low power\/wide field astronomical observing with long focal length refractors and catadioptric telescopes . . .\n\u003cp\u003eThis long focal length 2\" Pentax eyepiece is outstanding for low power\/wide field astronomical observing with long focal length refractors and catadioptric telescopes. However, it is not that well suited to fast focal ratio reflectors. For example, it provides a huge 8.9mm exit pupil with an f\/4.5 Dobsonian reflector. As the eyes of most observers are unable to dilate to this size, this eyepiece will probably waste a good portion of the light-gathering capacity of a fast focal ratio scope. It is better suited to longer focal ratio refractors, Schmidt-Cassegrains, and Maksutov-Cassegrains than it is to reflectors with focal ratios shorter than f\/6. Using it with a 2\" star diagonal in a 2000mm 8\" f\/10 Schmidt-Cassegrain, for example, will result in 50x and a wide 1.4° field of view. That is almost three times the diameter of the full Moon and a large enough field to fit in all of the Pleiades, with room to spare. It will also work well for rich field observing with moderately fast focal ratio refractors. For example, with the 600mm focal length TeleVue TV-85 it provides 15x, a 5.7mm exit pupil, and a huge 4.7° field. With the 650mm focal length TMB-105 triplet apo, it provides 16.3x, a 6.45mm exit pupil, and a 4.3° field. On both scopes, the fields are eight to nine times as wide as the Moon. These figures are all very usable for capturing galaxy clusters, viewing emission and reflection nebulas and open star clusters in their entirety, scanning the star clouds of Sagittarius and large and faint nebula remnants such as the Veil, etc. You can use the calculator below to see how wide a field it will give you with your particular scope.\u003c\/p\u003e\n\u003cp\u003eThe long 20mm eye relief is ideal for those who \u003cem\u003emust \u003c\/em\u003e wear eyeglasses while observing due to astigmatism. The substantial 24.7 oz. weight of the eyepiece may require rebalancing of some Dobsonians if you switch between this 2\" eyepiece and a lighter 1.25\" eyepiece.\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e70\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e40mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e24.7 oz\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","brand":"Pentax","offers":[{"title":"Default Title","offer_id":40221633151049,"sku":"PXW40","price":526.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/XW40.png?v=1722975047"},{"product_id":"22mm-2-nagler-type-4","title":"TeleVue 22mm 2\" Nagler Type 4 Eyepiece","description":"\u003cp\u003eThe TeleVue 2\" 22mm Nagler Type 4 replaces the 20mm Nagler Type 2, considered by many to be the finest eyepiece ever made. How do you improve on a legend? The 22mm does it by cutting the weight of the 20mm Nagler in half, doubling the eye relief, and increasing the contrast, while otherwise maintaining the superb observing experience that makes the 20mm Nagler such an observing gem.\u003c\/p\u003e\n\u003cp\u003eThe 22mm has TeleVue's unique \"Instadjust\" click-stop adjustable-height eyeguard, with a soft fold-down rubber eyecup. With the eyeguard retracted all the way, all of its very long 19mm eye relief is available for eyeglass use. The eyeguard can be raised in small and repeatable increments to position the eye of the non-eyeglass wearer the precise distance from the eyepiece to see the full field of view with maximum suppression of ambient stray light. A special doughnut-shaped removable plastic insert fits into the eyeguard to center the eye for those who have trouble positioning their eye precisely on a small exit pupil.\u003c\/p\u003e\n\u003cp\u003eThis eyepiece is primarily designed for no-holds-barred medium power deep space use with scopes having focal ratios down to f\/4. It is marvelous for open clusters, nebulas, and globular clusters with any scope, but is particularly effective with fast f\/ratio reflectors. That being said, it must also be noted that its very wide field also makes it convenient for moderate power lunar and planetary observing with Dobsonians, as you have much longer to observe before the planet drifts out of the field and the scope has to be repositioned.\u003c\/p\u003e\n\u003cp\u003ePlease note the weight of this eyepiece if you have a Dobsonian telescope. Its use may require some temporary rebalancing of your scope, or the use of a TeleVue #TVEQC equalizing adapter with 1.25\" eyepieces to avoid balance problems.\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e19mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e82\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e22mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e24 oz\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","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":40221655105609,"sku":"TN22","price":551.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/EN4_220_Nagler_22T4_V2copy.jpg?v=1723667375"},{"product_id":"31mm-2-nagler-type-5","title":"TeleVue 31mm 2\" Nagler Type 5 Eyepiece","description":"\u003cp class=\"p1\"\u003eThe straightforward way to build a 31mm wide-field eyepiece is to scale up what already works. TeleVue took one look at where that math led — a seven-lens design the size and weight of a bowling ball — and went back to the drawing board. What came out the other side is the now legendary 31mm Type 5 Nagler: a six-element optical design with rare earth glass, 82 degrees of apparent field, and a following that any manufacturer of any product in the world would be jealous of.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 0.875rem;\"\u003eThe eyepiece still ended up being a little large at 35 ounces.  On a Dobsonian, switching from a short 1.25\" eyepiece to this one may require rebalancing your scope. TeleVue makes a #TVEQC equalizing adapter specifically for this situation, and if you own a large Dob, it's worth having. That said: this eyepiece is heavier than you'd like, and it will likely become the eyepiece you reach for more than any other you own. These facts coexist comfortably once you've used it.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe engineering behind the Type 5 deserves a plain-English explanation. Some of the six optical elements are over 70mm in diameter — larger than the objective lens of TeleVue's own Pronto refractor. Four of the six elements use exotic glass formulations. The result is a 42mm field stop, the largest possible in a 2\" barrel, delivering the widest true field you can achieve without going to a 3\" focuser. TeleVue individually tests every eyepiece before it ships. \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cstrong\u003eWhat's Included\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"ul1\"\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003eTeleVue 31mm Nagler Type 5 eyepiece (2\" barrel)\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003eFold-down eyeguard\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003eRubber grip ring\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003eEyeguard cover\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003eUndercut barrel \u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e2\" filter thread compatibility\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p6\"\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003e\u003cstrong\u003e82° Apparent Field of View\u003c\/strong\u003e — \u003c\/span\u003eThe Nagler standard — wide enough that experienced observers consistently describe it as looking through a porthole rather than a tube. Objects track across the field slowly enough that you notice the movement before they exit.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003e\u003cstrong\u003eSix-Element Type 5 Design\u003c\/strong\u003e — \u003c\/span\u003eThe previous Nagler formula applied to a 31mm focal length would have produced something unacceptably large and heavy. The Type 5 design solves this with six elements and four exotic glass types, maintaining the contrast and edge sharpness the Nagler line is known for while keeping the package to a manageable size.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003e\u003cstrong\u003e19mm Eye Relief\u003c\/strong\u003e — \u003c\/span\u003eComfortable for eyeglass wearers. Long enough that you're not pressing your eye against the glass, short enough that you're not hunting for the sweet spot. The fold-down eyeguard accommodates both.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003e\u003cstrong\u003eRare Earth Glass Elements\u003c\/strong\u003e — \u003c\/span\u003eMultiple elements exceed 70mm in diameter — physically larger than some small refractor objectives. The glass choices are what make the Type 5 optically practical at this focal length. \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003e\u003cstrong\u003eFull Multi-Coatings, Blackened Lens Edges\u003c\/strong\u003e — \u003c\/span\u003eTeleVue's proprietary coatings are tuned, not generic. Blackened lens edges reduce scatter. Together they contribute to the contrast that makes the 31mm Nagler the preferred choice for observers hunting faint nebulosity in large aperture scopes.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003e\u003cstrong\u003eFilter Threads \u003c\/strong\u003e — \u003c\/span\u003eThe 31mm Nagler is threaded to accept 2\" filters.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003e\u003cstrong\u003eAnodized Aluminum Body\u003c\/strong\u003e — \u003c\/span\u003e The barrel undercut provides a positive lock in any standard focuser. At 35 ounces, you want confidence that it's secure.\u003c\/p\u003e\n\u003cp class=\"p6\"\u003e\u003cstrong\u003eUnder the Night Sky\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eIn an 8\" f\/6 Dobsonian, the 31mm Nagler delivers a true field of about 2° — wide enough to frame the Pleiades with room to spare, or to sweep the Virgo Galaxy Cluster in a single field. In a 12\" or larger Dob the exit pupil stays in the useful range and the field becomes genuinely immersive. The Veil Nebula, the North America Nebula, large open clusters — objects that fragment into pieces in a narrower eyepiece hold together here. \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eWhat Cloudy Nights Members Say\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003ci\u003e“The TMB92SS with the 31mm Nagler provides one of the most remarkable rich field views obtainable in portable telescopes available today. The views simply have to be seen to be believed — a celestial window through which to experience the Universe that is, quite frankly, breathtaking in extent.”\u003c\/i\u003e\u003cspan class=\"s1\"\u003e\u003cspan class=\"Apple-converted-space\"\u003e  \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003ci\u003e“Under dark skies, the 31mm gets far more eyepiece time — most of the time I am using the 35mm Pan is because the 31mm is in another scope. The 31mm Nagler takes it to the next level. It’s wider and even more perfect.”\u003c\/i\u003e\u003cspan class=\"s1\"\u003e\u003cspan class=\"Apple-converted-space\"\u003e  \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003ci\u003e“I have a 31 Nagler, and it’s an amazing eyepiece. I use it in my TeleVue 101, and it’s just a lovely combo for widefield views. I have no desire in trying out other wider eyepieces.”\u003c\/i\u003e\u003cspan class=\"s1\"\u003e\u003cspan class=\"Apple-converted-space\"\u003e  \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p6\"\u003e\u003cstrong\u003eObserving Tip\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe 31mm Nagler shines brightest under dark skies where the large exit pupil works in your favor. In light-polluted suburban skies, the wide field can work against you on diffuse objects — the background sky brightens along with the target. For urban observers, an OIII or UHC filter makes a significant difference. The 2\" filter threads are there for a reason.\u003c\/p\u003e\n\u003cp class=\"p6\"\u003e\u003cstrong\u003eFAQ\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003e\u003cstrong\u003eIs this eyepiece compatible with my focuser?\u003c\/strong\u003e — \u003c\/span\u003eThe 31mm Nagler uses a standard 2\" barrel with an undercut for extra security. Any focuser with a  compression ring or thumbscrew will hold it securely. The undercut prevents the eyepiece from being pushed up into the focuser — a thoughtful detail given the weight.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003e\u003cstrong\u003eWill it balance on my Dobsonian?\u003c\/strong\u003e — \u003c\/span\u003ePossibly not without adjustment, especially if you're switching from a light 1.25\" eyepiece. TeleVue makes the #TVEQC equalizing adapter to address this. If you own a large Dob and plan to use this eyepiece regularly, the adapter is worth having.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003e\u003cstrong\u003eWhat telescopes work best with this eyepiece?\u003c\/strong\u003e — \u003c\/span\u003eThe 31mm Nagler is most at home in telescopes with focal lengths between 1000mm and 2000mm — long enough to keep the exit pupil in a useful range. Large Dobsonians from 8\" aperture and up are the classic pairing. It also performs beautifully in long-focal-length refractors and SCTs.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003e\u003cstrong\u003eIs it worth it?\u003c\/strong\u003e — \u003c\/span\u003eThat depends on your observing habits. If you spend significant time under dark skies with a large aperture scope, and you value wide-field views of nebulae, clusters, and the Milky Way, the 31mm Nagler is the standard by which other wide-field eyepieces at this focal length are judged. If you're primarily a planetary observer, you'll get less value from it. We're happy to talk through whether it fits your situation — call us.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003e\u003cstrong\u003eHow does it compare to other wide-field 2\" eyepieces?\u003c\/strong\u003e — \u003c\/span\u003eThe 31mm Nagler competes with a short list of eyepieces at similar price points. What distinguishes it is TeleVue's individual testing program and the proven field performance of the Type 5 design over many years. Alternatives exist. The 31mm Nagler remains the benchmark.\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px;\"\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%;\"\u003eFocal Length\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e31mm\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;\"\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e82°\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;\"\u003eEye Relief\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e19mm\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;\"\u003eBarrel Size\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e2\"\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;\"\u003eField Stop\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e42mm\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;\"\u003eOptical Elements\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e6 (4 exotic glass types)\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;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e35 oz (992g)\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;\"\u003eFilter Threads\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e2\"\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;\"\u003eBody\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eAnodized aluminum\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;\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eEN5-310\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":40221655138377,"sku":"TN31","price":789.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/EN5_310_Nagler_31T5_V2copy.jpg?v=1723668743"},{"product_id":"55mm-plossl","title":"TeleVue 55mm Plössl Eyepiece","description":"\u003cp\u003eIf you have a 2\" focuser on your f\/8 and longer focal ratio telescope, here's a 2\" eyepiece that will give you the widest possible field of view - even wider than a 31mm Nagler, but at less than 40% the cost. (The 31mm Nagler is designed to give maximum brightness and field of view on a fast focal ratio Dobsonian, not a long focal ratio refractor, Schmidt-Cassegrain, or Maksutov-Cassegrain, as is the 55mm Plössl.)\u003c\/p\u003e\n\u003cp\u003eThis is a good low power\/wide field eyepiece that provides the widest field and largest exit pupil possible with an f\/10 Schmidt-Cassegrain for true rich field observing. It's ideal for capturing many of the more compact open clusters such as the Pleiades, viewing emission and reflection nebulas in their entirety, scanning large and faint nebula remnants such as the Veil, etc. You can use the calculator below to see how wide a field it will give you with your particular focal length scope.\u003c\/p\u003e\n\u003cp\u003eIt has a rubber grip ring for comfortable use in cold weather. It provides an immense and wasteful 12.2mm exit pupil with an f\/4.5 Dobsonian reflector. As the only observers whose eyes can dilate to this size are probably owls, this eyepiece would not be a sensible choice for fast focal ratio reflectors. It is better suited to the longer focal ratios of refractors, Schmidt-Cassegrains, and Maksutov-Cassegrains than it is to reflectors with focal ratios shorter than f\/8. If you have a long focal ratio 2\" focuser scope, however, this is a terrific way to get the most out of it.\u003c\/p\u003e\n\u003cp\u003eThe eye relief is long enough to allow eyeglass wearers to see all of the field with their glasses on, yet it's not so long that those who don't wear glasses will find observing uncomfortable. The eyepiece is provided with a unique adjustable height eyeguard adapter that aids in properly positioning your eye in the exit pupil. This minimizes \"pupil shadowing\" and reduces stray light to maximize contrast. The soft rubber eyecup can be used fully extended or rolled back, whichever is more comfortable. You can also selectively extend one side of the eyecup to shield your eye from external light (such as a neighbor's porch light).\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e55mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e21 oz\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":"TeleVue","offers":[{"title":"Default Title","offer_id":40221655531593,"sku":"TP55","price":290.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/EPL_550_Plossl_55_v2copy.jpg?v=1723669848"},{"product_id":"27mm-2-panoptic","title":"TeleVue 27mm 2\" Panoptic Eyepiece","description":"\u003cp\u003eAn excellent premium-quality low power wide field 2\" eyepiece for the serious deep space explorer. The 27mm Panoptic, for example, will give you a 0.92 degree field at 74x with a \u003cem\u003ebig \u003c\/em\u003e17.5\" f\/4.5 Dobsonian. That's almost two lunar diameters and is ideal for observing large emission and reflection nebulas and nebula remnants.\u003c\/p\u003e\n\u003cp\u003eWhile it's particularly well-suited for use with Dobsonians (it provides a huge 6mm exit pupil for rich field observing on an f\/4.5 scope), it can provide \"picture window onto space\" images with any telescope type that can use a 2\" eyepiece. With 16mm of usable eye relief, the 27mm Panoptic can be used by eyeglass wearers with almost no vignetting of the field of view. The 27mm Panoptic would be a welcome addition to any serious eyepiece collection.\u003c\/p\u003e\n\u003cp\u003eIt weighs a substantial 18 ounces, so you may have to do a little scope rebalancing when you use it with some low friction Dobsonians.\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e16mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e68\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e27mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e18 oz\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","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":40221655662665,"sku":"PAN27","price":431.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/EPN_270_Panoptic_27_V5a_d0831eaa-855c-4ee8-8abe-745919552851.jpg?v=1767278454"},{"product_id":"35mm-2-panoptic","title":"TeleVue 35mm 2\" Panoptic Eyepiece","description":"\u003cp\u003eAn excellent and physically-impressive premium-quality low power wide field 2\" eyepiece for the serious deep space explorer. The Tele Vue 35mm Panoptic, for example, will give you a 1.19 degree field at 57x with a \u003cem\u003ebig \u003c\/em\u003e17.5\" f\/4.5 Dobsonian. That's well over two lunar diameters and is ideal for observing large emission and reflection nebulas and nebula remnants. While it's particularly well-suited for Dobsonian use, it can provide \"picture window onto space\" images with any telescope type that can use a 2\" eyepiece.\u003c\/p\u003e\n\u003cp\u003eThe 35mm Panoptic provides a huge 7.8mm exit pupil on an f\/4.5 scope, which may actually waste some of an f\/4.5 scope's light-gathering capacity if your eye can't dilate enough to take in such a large exit pupil. Focal ratios of f\/5 (a 7mm exit pupil) and longer may benefit the most from this very big and visually-impressive eyepiece. With a huge 28mm of usable eye relief, the 35mm Panoptic can be used by eyeglass wearers with no vignetting of the field. The 35mm Panoptic would be a welcome addition to any serious eyepiece collection.\u003c\/p\u003e\n\u003cp\u003eIt weighs a hefty 28 ounces, so you may have to do some scope rebalancing when you use it with some low friction Dobsonians.\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e28mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e68\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e35mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e28 oz\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","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":40221655695433,"sku":"PAN35","price":485.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/EPN_350_Panoptic_35_V5a.jpg?v=1767278493"},{"product_id":"41mm-2-panoptic","title":"TeleVue 41mm 2\" Panoptic Eyepiece","description":"\u003cp\u003eThis is a premium-quality wide field 2\" eyepiece for the serious deep space explorer. Because of its long focal length, it is at its best with telescopes having a focal ratio of f\/6 or longer. You can use the calculator below to see just how wide the field will be with your particular scope. For example, it will give you a 1.39 degree field at 49x with a \u003cem\u003ebig \u003c\/em\u003e17.5\" f\/4.5 Dobsonian. That's almost three lunar diameters and is ideal for observing large emission and reflection nebulas and nebula remnants.\u003c\/p\u003e\n\u003cp\u003eHowever, the 41mm Panoptic provides a huge 9.1mm exit pupil on an f\/4.5 Dobsonian. This will actually waste some of the scope's light-gathering capacity, as it is unlikely that your eye can dilate wide enough to take in such a large exit pupil. Focal ratios of f\/6 (a 6.8mm exit pupil) and longer will benefit the most from this very big and visually impressive eyepiece. So, while it's not particularly well suited for Dobsonian use, it can provide \"picture window onto space\" images with any other telescope type that can use a 2\" eyepiece. The field of view is so wide that you actually have to move your head from side to side to take it all in.\u003c\/p\u003e\n\u003cp\u003eWe measure the usable eye relief at a long 19mm, allowing the 41mm Panoptic to be used by eyeglass wearers with no vignetting of the field. The eyepiece is provided with a unique adjustable height eyeguard adapter that aids in properly positioning your eye in the exit pupil. This minimizes \"pupil shadowing\" and reduces stray light to maximize contrast. The soft rubber eyecup can be used fully extended or rolled back, whichever is more comfortable. You can also selectively extend one side of the eyecup to shield your eye from external light (such as a neighbor's porch light). The 2\" TeleVue 41mm Panoptic would be a welcome addition to any serious eyepiece collection.\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e19mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e68\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e41mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e33.6 oz.\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","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":40221656711241,"sku":"PAN41","price":654.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/EPO_410_Panoptic_41_V2copy.jpg?v=1723669603"},{"product_id":"13mm-1-25-2-100-field-ethos","title":"TeleVue 13mm 1.25\"\/2\" 100° Field Ethos","description":"\u003cp\u003eThe 100° apparent field of this new TeleVue 13mm Ethos eyepiece provides a field area more than 50% larger than the \"space-walking\" 82° field of a 13mm Nagler.\u003cimg alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003eA review in \u003cem\u003eSky \u0026amp; Telescope \u003c\/em\u003emagazine gave the 13mm Ethos five stars, meaning \"Sensibly perfect. No meaningful improvements possible.\" The reviewer commented, \"As revolutionary today as the original 13-mm Nagler eyepiece was when it was introduced in 1981, the 13-mm Ethos sets a new standard for wide-field observing. The on-axis performance is second to none, while the 100° apparent field is unprecedented for an astronomical eyepiece . . . if I were dropped on a desert island tomorrow with the 12-inch scope and only one eyepiece, I'd want it to be the Ethos.\"\u003c\/p\u003e\n\u003cp\u003eWith a 13mm focal length that evokes that of the original and revolutionary 13mm Nagler eyepiece, the field of this new 100° apparent field Ethos eyepiece is nearly 50% larger in area than the 82° field of a \"space-walking\" 13mm Nagler. The TeleVue Ethos delivers the true field size of a longer focal length (but narrower apparent field) eyepiece, but has the benefits of the higher power and darker sky background that are inherent in a shorter focal length.\u003c\/p\u003e\n\u003cp\u003eThere is a soft rolldown eyecup to shield the eye from ambient light (from a neighbor's security light, for example) and improve the image contrast. At a usable eye relief of 15mm, the 13mm Ethos would normally somewhat vignette the field of view for eyeglass wearers. However, since the 100° field is so wide that you can't see the full field without having to move your head from side to side to take it all in anyway, vignetting in the conventional sense is not a problem.\u003c\/p\u003e\n\u003cp\u003eThe 13mm Ethos has all the virtues that professional and amateur astronomers have come to expect from a TeleVue eyepiece: high contrast, comfortable eye relief, and full field sharpness - with well-controlled astigmatism, field curvature, lateral color, angular magnification distortion correction, and low pupil sensitivity (kidney bean effect) for daytime use. While sharpness is inherent to the optical design itself, the contrast is maximized through the intelligent use of flat finished baffles and ultra low reflectance, high efficiency coatings that are tuned to the glass composition of each lens element.\u003c\/p\u003e\n\u003cp\u003eThe Ethos has concentric 1.25\" and 2\" barrels that allow it to be used in both 1.25\" and 2\" focusers and star diagonals without the need to change the diagonal or eyepiece adapter. A safety groove is machined into the 2\" chrome barrel to engage your focuser thumbscrew. This will help prevent the eyepiece from falling should the thumbscrew accidentally loosen while observing.\u003c\/p\u003e\n\u003cp\u003eThe barrel diameter of the current version of the 13mm Ethos has been reduced slightly to 62mm, from the 63.5mm of the first versions to be shipped. This will allow the use of two 13mm Ethos eyepieces in a binoviewer, providing a minimum interpupillary distance of 62mm. This spacing will be usable for the majority of observers, but some people with narrower than average eye spacing may not be able to use this combination. If you are a very serious binoviewer astronomer, a pair of 13mm Ethos may be worth a try.\u003c\/p\u003e\n\u003cp\u003eA commentary on a \u003cem\u003eCloudy Nights \u003c\/em\u003eforum, quoted by TeleVue, said, \"Forget about the 100-degree field (well . . . I know you can't but . . .), this is quite simply the finest eyepiece I've ever seen - period! Contrast, sharpness, light-throughput, etc. are all just amazing. There is simply NO ghosting or other internal reflections . . . the background is jet-black and the stars (even in my 28\" f\/3.66) are absolute diamond-points to the very edge!(P\u0026gt; \"I've owned and used all of the \"gold standards\" over the years and NOTHING I've seen can match this!\u003c\/p\u003e\n\u003cp\u003e\"Along with about a half-dozen other observers we did \"A\/B\" testing with other top-of-the-line 13 and 14mm eyepieces (M-51, Thor's Helmet and M-42 were the targets). EVERYONE agreed that the ETHOS seemed to add additional inches of aperture. The increased detail in all of the objects was instantly apparent!\u003c\/p\u003e\n\u003cp\u003e\"As a bonus, the fine detail on Saturn equaled or exceeded the best \"planetary\" eyepieces any of us had ever used. And, again, NO ghosting or internal reflections. This baby does it all.\u003c\/p\u003e\n\u003cp\u003e\"And, as for the 100 degree field, Vic said it best . . . 'you feel like you're going to fall in' . . . 'the scope just gets out of the way and it's like you're standing in space looking at the objects.'\"\u003c\/p\u003e\n\u003cp\u003eThe 13mm TeleVue Ethos eyepiece will accept TeleVue Dioptrx eyesight astigmatism correcting lenses.\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1.25\"\/2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e15mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e13mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e20 oz.\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","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":40221661167689,"sku":"TE13","price":745.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/ETH_130_Ethos_13_v2copy.jpg?v=1723661527"},{"product_id":"tele-vue-17mm-2-100-field-ethos","title":"TeleVue 17mm 2\" 100° Field Ethos Eyepiece","description":"\u003cp\u003eThe 17mm TeleVue Ethos 100° field eyepiece is designed for no-holds-barred medium power deep space use with telescopes having focal ratios down to f\/4. It is exceptionally effective on nebulas with fast f\/ratio reflectors, such as Dobsonians, giving both an immense field and a bright exit pupil (nearly 4mm with the typical f\/4.5 Dob). Its very wide field also makes it convenient for moderate power lunar and planetary observing with Dobsonians, as you have much longer to observe before the planet drifts out of the field and the scope has to be repositioned. That said, it is worth noting that the new 17mm TeleVue Ethos is marvelous for open clusters, nebulas, galaxy clusters, and globular clusters with \u003cem\u003eany \u003c\/em\u003etelescope.\u003c\/p\u003e\n\u003cp\u003eThe 100° apparent field of this new 17mm Ethos eyepiece is nearly 50% larger in area than the 82° field of a \"space-walking\" 17mm Nagler. You \u003cem\u003ecould \u003c\/em\u003eget a similar true field with a longer focal length (but narrower apparent field) eyepiece, but the 17mm TeleVue Ethos has the benefits of the higher power and darker sky backgrounds that are inherent in its shorter focal length. \u003c\/p\u003e\n\u003cp\u003eThere is a soft rolldown eyecup to shield the eye from ambient light (from a neighbor's security light, for example) and improve the image contrast. At a usable eye relief of 15mm, the 17mm Ethos would normally somewhat vignette the field of view for eyeglass wearers. However, since the 100° field is so wide that you can't see the full field without having to move your head from side to side to take it all in anyway, vignetting in the conventional sense is not a problem.\u003c\/p\u003e\n\u003cp\u003eThe 17mm Ethos has all the virtues that professional and amateur astronomers have come to expect from a TeleVue eyepiece: high contrast, comfortable eye relief, and full field sharpness - with well-controlled astigmatism, field curvature, lateral color, angular magnification distortion correction, and low pupil sensitivity (kidney bean effect) for daytime use. While sharpness is inherent to the optical design itself, the contrast is maximized through the intelligent use of flat finished baffles and ultra low reflectance, high efficiency coatings that are tuned to the glass composition of each lens element.\u003c\/p\u003e\n\u003cp\u003eThe 17mm Ethos fits 2\" focusers only. A safety groove is machined into the 2\" chrome barrel to engage your focuser thumbscrew. This will help prevent the eyepiece from falling should the thumbscrew accidentally loosen while observing.\u003c\/p\u003e\n\u003cp\u003eThe 17mm TeleVue Ethos eyepiece will accept TeleVue Dioptrx eyesight astigmatism correcting lenses.\u003c\/p\u003e\n\u003cp\u003ePlease note the weight of this eyepiece if you have a Dobsonian telescope. Its use may require some temporary rebalancing of your scope, or the use of a TeleVue #TVEQC equalizing adapter with your 1.25\" eyepieces to avoid balance problems.\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e15mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e17mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e24.8 oz.\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","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":40221664444489,"sku":"TE17","price":901.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/ETH_17.0_Ethos_17copy.jpg?v=1723662010"},{"product_id":"tele-vue-6mm-1-25-2-100-field-ethos","title":"TeleVue 6mm 1.25\"\/2\" 100° Field Ethos Eyepiece","description":"\u003cp\u003e\u003cimg src=\"\/images\/Hot2010-online.jpg\" alt=\"\"\u003eJust like the 8mm TeleVue Ethos before it, the TeleVue 6mm Ethos eyepiece once again raises the bar for shorter focal length eyepieces. It expands the apparent field of view to an astonishing 100°, compared to the 50° field typical of most shorter focal length eyepieces. You can use the field of view calculator below to see just how much sky the 6mm Ethos can reveal with your telescope.\u003c\/p\u003e\n\u003cp\u003eThe 6mm Ethos is designed for no-holds-barred high power solar system and deep space observing with \u003cem\u003eany \u003c\/em\u003etelescope. However, its very wide field makes it particularly convenient for lunar and planetary observing with Dobsonians. It gives you twice as long to observe with a Dob before an object drifts out of the field and the scope has to be repositioned than you get with orthos, Plössls, and similar narrower field eyepieces.\u003c\/p\u003e\n\u003cp\u003eThere is a soft rolldown eyecup to shield the eye from ambient light (from a neighbor's security light, for example) and improve the image contrast. With a usable eye relief of 15mm, the 6mm Ethos might normally somewhat vignette the field of view for some eyeglass wearers. However, since the 100° field is so wide that you can't see the full field without having to move your head from side to side to take it all in anyway, vignetting in the conventional sense is not a problem.\u003c\/p\u003e\n\u003cp\u003eThe 6mm Ethos has all the virtues that astronomers have come to expect from a TeleVue eyepiece: high contrast, comfortable eye relief, and full field sharpness - with well-controlled astigmatism, field curvature, lateral color, angular magnification distortion correction, and low pupil sensitivity (kidney bean effect) for daytime use. While sharpness is inherent to the optical design itself, the contrast is maximized through the intelligent use of flat finished baffles and ultra low reflectance, high efficiency coatings that are tuned to the composition of each lens element.\u003c\/p\u003e\n\u003cp\u003eCompared to any longer focal length eyepiece (even the 13mm Ethos), the higher magnification of the 6mm Ethos provides a darker sky background, with fainter stars becoming visible and more detail showing in all deep sky objects. With its incredible 100° field, the 6mm Ethos gives you dramatic high power views that are simply not possible with a similar focal length eyepiece, no matter what telescope you use. In addition, the smaller exit pupil of the 6mm reduces eyesight limitations due to astigmatism when compared with longer focal length eyepieces.\u003c\/p\u003e\n\u003cp\u003eThe 6mm Ethos has concentric 1.25\" and 2\" barrels that allow it to be used in both 1.25\" and 2\" focusers and star diagonals without the need to change the diagonal or eyepiece adapter. A safety groove is machined into the 2\" chrome barrel to engage your focuser thumbscrew. This will help prevent the eyepiece from falling should the thumbscrew accidentally loosen while observing. A rubber grip ring provides a sure grip in cold weather when wearing gloves or mittens.\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\/1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e15mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e15.5 oz.\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","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":40221664510025,"sku":"TE06","price":700.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/ETH_06.0_Ethos_6copy.jpg?v=1723670088"},{"product_id":"tele-vue-10mm-1-25-2-100-field-ethos","title":"TeleVue 10mm 1.25\"\/2\" 100° Field Ethos Eyepiece","description":"\u003cp\u003eThe 10mm TeleVue Ethos is a \"do-it-all\" eyepiece that is perfect for all telescopes that can utilize this focal length. And, as it fills the hole between the 13mm and 8mm Ethos eyepieces, the 10mm makes an ideal centerpiece for a state-of-the-optical-art 17mm\/10mm\/6mm Ethos set.\u003c\/p\u003e\n\u003cp\u003eThe 10mm Ethos has a soft rolldown eyecup. It shields your eye from ambient light (from a neighbor's security light, for example) to improve the image contrast. With a usable eye relief of 15mm, the 10mm Ethos normally might somewhat vignette the field of view for some eyeglass wearers. However, since the 100° field is so wide that you can't see the full field without having to move your head from side to side to take it all in anyway, vignetting in the conventional sense is not a problem.\u003c\/p\u003e\n\u003cp\u003eThe 10mm Ethos has all the high contrast, comfortable eye relief, and full field on-axis sharpness virtues that astronomers have come to expect from a TeleVue eyepiece. It has well-controlled astigmatism, low field curvature, and virtually no lateral color or angular magnification distortion. It addition, it has low pupil sensitivity (kidney bean effect) for daytime use. While its sharpness is inherent to the optical design itself, the contrast is maximized through the intelligent use of flat finished baffles and ultra low reflectance, high efficiency coatings that are tuned to the composition of each lens element.\u003c\/p\u003e\n\u003cp\u003eCompared to any longer focal length eyepiece (even the 13mm Ethos), the higher magnification of the 10mm Ethos provides a darker sky background, with fainter stars becoming visible and more detail showing in all deep sky objects. With its incredible 100° field, the 10mm Ethos gives you dramatic views that are simply not possible with a narrower field similar focal length eyepiece, no matter what telescope you use. In addition, the smaller exit pupil inherent in the 10mm focal length reduces eyesight limitations due to astigmatism when compared with the larger exit pupils of longer focal length eyepieces.\u003c\/p\u003e\n\u003cp\u003eThe 10mm Ethos has concentric 1.25\" and 2\" barrels that allow it to be used in both 1.25\" and 2\" focusers and star diagonals without the need to change the diagonal or eyepiece adapter. A safety groove is machined into the 2\" chrome barrel to engage your focuser thumbscrew. This will help prevent the eyepiece from falling should the thumbscrew accidentally loosen while observing. A rubber grip ring provides a sure grip in cold weather when wearing gloves or mittens.\u003c\/p\u003e\n\u003cp\u003eThe 10mm Ethos has a maximum barrel diameter of 61mm, making it more usable in binoviewers than its larger diameter 13mm big brother. In a binoviewer, a pair of 10mm Ethos eyepieces provides the ultimate in virtual 3-D \"spacewalk\" observing.\u003c\/p\u003e\n\u003cp\u003eThe 10mm TeleVue Ethos eyepiece will accept TeleVue Dioptrx eyesight astigmatism correcting lenses. It is parfocal with TeleVue Radian, Plössl, Type 6 Nagler, and 1.25\" Panoptic eyepieces.\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1.25\"\/2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e15mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e17.7 oz.\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","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":40221666639945,"sku":"TE10","price":745.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/ETH_10.0_Ethos_10mm_v1copy.jpg?v=1723660499"},{"product_id":"explore-scientific-20mm-100-field-waterproof-2-eyepiece","title":"Explore Scientific 20mm 100° field waterproof 2\" eyepiece","description":"\u003cp\u003eThe 100° apparent field of the Explore Scientific 20mm waterproof 2\" eyepiece provides superb maximum field\/medium power observing in all scopes, from small apo refractors to the largest Dobsonians and catadioptrics.\u003c\/p\u003e\n\u003cp\u003eThe 20mm Explore Scientific 100° field 2\" eyepiece is O-ring sealed and nitrogen-purged to be 100% waterproof. To insure a perfect seal, Explore Scientific tests every eyepiece in one meter of water for 30 minutes before shipping.\u003c\/p\u003e\n\u003cp\u003eInternally sealing the eyepiece and purging it with inert, dry nitrogen gas prevents internal fogging in the eyepiece when observing at sub-freezing temperatures. For observers in dusty climates, sealing keeps wind-blown dust and fine particulates from getting into the eyepiece body. For observers in very humid climates, sealing prevents the growth of fungus on the internal lens elements. For all observers, complete sealing maximizes the life of the internal optical coatings and makes the eyepiece easier to clean, as there is no risk of cleaning solution migrating from the top of the lens and seeping around edges to be trapped in between elements.\u003c\/p\u003e\n\u003cp\u003eThe 20mm Explore Scientific eyepiece, has high contrast, comfortable eye relief, and full field sharpness - with well-controlled astigmatism, field curvature, and lateral color. Its nine element optical system (using lenses of dense crown, light crown, dense flint, and lanthanum rare earth optical glasses) is designed for maximum field\/medium power deep space use with telescopes having focal ratios down as low as f\/4. It is exceptionally effective on nebulas with fast f\/ratio reflectors, such as Dobsonians, as it gives both an immense field and a bright exit pupil (almost 4.5mm with the typical f\/4.5 Dob). Its very wide field also makes it convenient for moderate power lunar and globular cluster observing with Dobsonians, as you have much longer to observe before the planet drifts out of the field and the scope has to be repositioned than you do with a 60° or 70° (or even 82°) field eyepiece. In addition to Dobs, the new 20mm Explore Scientific Explore Scientific is marvelous for observing open clusters, nebulas, galaxy clusters, and globular clusters with \u003cem\u003eany \u003c\/em\u003etelescope capable of using a 2\" eyepiece.\u003c\/p\u003e\n\u003cp\u003eThe 100° apparent field of this new 20mm Explore Scientific eyepiece is nearly 50% larger in area than an 82° field eyepiece. You \u003cem\u003ecould \u003c\/em\u003eget a similar true field with a longer focal length (but narrower apparent field) conventional eyepiece, but the 20mm Explore Scientific Explore Scientific has the benefits of the higher power and darker sky backgrounds that are inherent in its shorter focal length. \u003c\/p\u003e\n\u003cp\u003eThere is a soft roll down eyecup to shield your eye from ambient light (from a neighbor's security light, for example) and improve the image contrast. With an eye relief of 14.5mm, the 20mm Explore Scientific would normally somewhat vignette the field of view for eyeglass wearers. However, since the 100° field is so wide that you can't see the full field without having to move your head from side to side to take it all in anyway, vignetting in the conventional sense is not a problem.\u003c\/p\u003e\n\u003cp\u003eThe 20mm Explore Scientific fits 2\" focusers only. A safety groove is machined into the 2\" chrome barrel to engage your focuser thumbscrew. This helps prevent the eyepiece from falling should the thumbscrew accidentally loosen while observing.\u003c\/p\u003e\n\u003cp\u003eThis individually serial numbered Explore Scientific eyepiece is backed by a limited one year warranty, which will be extended to an ExploreScientific \u003cem\u003etransferable product lifetime\u003c\/em\u003e limited warranty when its warranty card is registered with Explore Scientific within 60 days of purchase.With the extended product lifetime warranty, this Explore Scientific eyepiece will be protected for as long as it continues to be manufactured, plus an additional five years. Full details on this \u003ca href=\"https:\/\/www.astronomics.com\/explore-scientific-warranty-information_t.aspx\"\u003eunique transferable lifetime warranty\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003cdiv class=\"spanrow\"\u003e\n\u003cstrong\u003e\u003cspan class=\"speccell speccell-left\"\u003eItem Number\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e   \u003c\/span\u003e\u003cspan class=\"speccell\"\u003eEPWP10020–01\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spanrow\"\u003e\n\u003cstrong\u003e\u003cspan class=\"speccell speccell-left\"\u003eFocal Length\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e    2\u003c\/span\u003e\u003cspan class=\"speccell\"\u003e0mm\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spanrow\"\u003e\n\u003cstrong\u003e\u003cspan class=\"speccell speccell-left\"\u003eLength\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e              \u003c\/span\u003e\u003cspan class=\"speccell\"\u003e156mm\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spanrow\"\u003e\n\u003cstrong\u003e\u003cspan class=\"speccell speccell-left\"\u003eWidth\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e                \u003c\/span\u003e\u003cspan class=\"speccell\"\u003e70mm\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spanrow\"\u003e\n\u003cstrong\u003e\u003cspan class=\"speccell speccell-left\"\u003eWeight\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e              \u003c\/span\u003e\u003cspan class=\"speccell\"\u003e916g\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spanrow\"\u003e\n\u003cstrong\u003e\u003cspan class=\"speccell speccell-left\"\u003eBarrel Size\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e       \u003c\/span\u003e\u003cspan class=\"speccell\"\u003e2.00”\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spanrow\"\u003e\n\u003cstrong\u003e\u003cspan class=\"speccell speccell-left\"\u003eEye Relief\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e         \u003c\/span\u003e\u003cspan class=\"speccell\"\u003e14.5mm\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spanrow\"\u003e\n\u003cstrong\u003e\u003cspan class=\"speccell speccell-left\"\u003eField Stop Diameter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e   \u003c\/span\u003e\u003cspan class=\"speccell\"\u003e34.8mm\u003c\/span\u003e\n\u003c\/div\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":40221668573257,"sku":"ES20","price":499.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/EPWP10020-01_1_2000x2000_6abfe4fc-3e77-4651-9455-fa4de391a7c2.webp?v=1722011197"},{"product_id":"tele-vue-21mm-2-100-field-ethos","title":"TeleVue 21mm 2\" 100° Field Ethos Eyepiece","description":"\u003cp\u003eWith a 21mm focal length, the field of this 100° apparent field Ethos eyepiece is nearly 64% larger in area than the 82° field of a \"space-walking\" 20mm Nagler. The TeleVue Ethos delivers the true field size of a longer focal length (but narrower apparent field) eyepiece, such as a 26mm Nagler, but has the benefits of the higher power and darker sky background that are inherent in a shorter focal length.\u003c\/p\u003e\n\u003cp\u003eThere is a soft rolldown eyecup to shield the eye from ambient light (from a neighbor's security light, for example) and improve the image contrast. At a usable eye relief of 15mm, the 21mm Ethos would normally somewhat vignette the field of view for eyeglass wearers. However, since the 100° field is so wide that you can't see the full field without having to move your head from side to side to take it all in anyway, vignetting in the conventional sense is not a problem.\u003c\/p\u003e\n\u003cp\u003eThe 21mm Ethos has all the virtues that professional and amateur astronomers have come to expect from a TeleVue eyepiece: high contrast, comfortable eye relief, and full field sharpness - with well-controlled astigmatism, field curvature, lateral color, angular magnification distortion correction, and low pupil sensitivity (kidney bean effect) for daytime use. While sharpness is inherent to the optical design itself, the contrast is maximized through the intelligent use of flat finished baffles and ultra low reflectance, high efficiency coatings that are tuned to the glass composition of each lens element.\u003c\/p\u003e\n\u003cp\u003eThe Ethos is designed for 2\" focusers and star diagonals only. A safety groove is machined into the 2\" chrome barrel to engage your focuser thumbscrew. This will help prevent the eyepiece from falling should the thumbscrew accidentally loosen while observing.\u003c\/p\u003e\n\u003cp\u003eThe 21mm TeleVue Ethos eyepiece will accept TeleVue Dioptrx eyesight astigmatism correcting lenses.\u003c\/p\u003e\n\u003cp\u003ePlease note the 36 ounce (2.25 lb.) weight of this eyepiece if you have a Dobsonian telescope. Its use may require some temporary rebalancing of your scope, or the use of a \u003ca href=\"\/televue-2-inch-1-25-inch-equalizing-eyepiece-adapter_p5238.aspx\"\u003eTeleVue #TVEQC equalizing adapter\u003c\/a\u003e with lighter 1.25\" eyepieces to avoid balance problems.\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e15mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e21mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2.25 lbs.\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","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":40221669097545,"sku":"TE21","price":1012.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/ETH_21.0_Ethos_21_v3copy.jpg?v=1723667296"},{"product_id":"tele-vue-3-7mm-1-25-2-110-field-ethos-sx","title":"TeleVue 3.7mm 1.25\"\/2\" 110° Field Ethos-SX Eyepiece","description":"\u003cp\u003eNearly half a century ago, Al Nagler designed the optics for the LEM (Lunar Excursion Module) simulator that was used to train NASA astronauts how to land on the Moon during the Apollo program. From Apollo 11 through Apollo 17, every astronaut pilot who landed on the Moon trained using Al's optics to learn how to do it.\u003c\/p\u003e\n\u003cp\u003eYears after the LEM program ended, the memory of the 110° view of the simulated moving lunar surface seen through the triangular cabin window of the LEM simulator inspired Al to develop an \"Ultra Wide Angle\" telescope eyepiece to approach that lunar landing \"simulator experience.\" That eyepiece was the famed 82° field Nagler. When the first Nagler hit the observing fields, it changed forever how amateur astronomers viewed the heavens. An early customer dubbed it a \"spacewalk\" view.\u003c\/p\u003e\n\u003cp\u003eBut the 82° Naglers, and even the recent 100° field Ethos eyepieces, didn't duplicate the original 110° LEM simulator experience Al remembered. So Al pushed Ethos designer Paul Dellechiaie to extend the field of the Ethos design to reach a full 110°, the same astonishing field as the LEM simulator. The result is the 3.7mm Ethos-SX (\u003cstrong\u003eS\u003c\/strong\u003eimulator e\u003cstrong\u003eX\u003c\/strong\u003eperience) eyepiece - a \u003cstrong\u003e\u003cem\u003eSky \u0026amp; Telescope Hot Product for 2011\u003c\/em\u003e\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eEssentially, \"the experience\" is about creating an image as natural as one sees with the unaided eye. With Paul's help, Al's initial dream for amateur astronomers is now fully realized. The 3.7mm Ethos-SX is designed and crafted to combine its exceedingly wide field of view with all the contrast, color-rendition, distortion correction, and center-to-edge sharpness needed to achieve that natural view.\u003c\/p\u003e\n\u003cp\u003eBeyond the desire to simply achieve 110°, the extended field of view gave TeleVue the ability to produce a superb planetary eyepiece with a deep sky true field of view that logically fits within the rest of the Ethos eyepiece line. With a 110° field, the Ethos-SX has 21% more apparent field of view area than the 100° Ethos design. This permits a nice 62% power increase from a 6mm Ethos, while still retaining 68% of its true field of view. The 3.7mm actually has more true field of view than a TeleVue 8mm Plössl, 6mm Radian, or 5mm Nagler Type 6!\u003c\/p\u003e\n\u003cp\u003eThe 3.7mm is a 1.25\" format eyepiece and is parfocal with a wide range of 1.25\" TeleVue Plössls, Panoptics, Radians, Naglers, Nagler Zooms, and 6mm and 8mm Ethos eyepieces. It can be used with the TeleVue DIOPTRX eyesight astigmatism corrector. The included screw-on 2\" adapter lets you use the 3.7mm Ethos-SX in a 2\" star diagonal or focuser and is designed to make the eyepiece parfocal with the 13mm and 10mm Ethos eyepieces when they are used in their 2\" modes.\u003c\/p\u003e\n\u003cp\u003eWe don't think we can aptly describe Al's original experience of \"flying over the moon\" in the LEM simulator, but for the first time, YOU can experience what the astronauts saw four decades ago. For example, with a TV-85 refractor (or any similar 600mm focal length scope), the actual field of view is 0.67°, so that the entire full Moon fits into the eyepiece field - \u003cem\u003ebut at a magnification of 162x! \u003c\/em\u003eTalk about getting up close and personal with the lunar surface!\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1.25\"\/2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e15mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e110\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e3.7mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e17.7 oz.\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","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":40221669523529,"sku":"TE03","price":745.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/ETH_03.7_Ethos_3.7_1.25_v1copy.jpg?v=1723668652"},{"product_id":"celestron-19mm-2-82-luminos","title":"Celestron 19mm 2\" 82° Luminos Eyepiece","description":"This exceptional Celestron 19mm Luminos ultra wide field 2\" eyepiece uses six optical elements for optimized performance across a very wide and flat 82° field of view. A 10\" f\/4.5 Dobsonian reflector will have a full 1.36° field at 60x with this eyepiece, large enough to hold all of the Pleiades in a single field. A 4\" f\/8 refractor will have a 1.91° field at 43x, nearly four times the diameter of the full Moon. The calculator below will show you how wide a field you can expect with your particular telescope.\n\u003cp\u003eThis 19mm Celestron Luminos is designed to have minimal field curvature. This makes it particularly well-suited for use with flat field telescopes such as Celestron EdgeHD and Meade Advanced Coma-Free flat field catadioptric scopes and refractors with field flatteners.\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e82\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e19mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e16.2 oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40221673717833,"sku":"CL8219","price":199.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/19457.jpg?v=1662968013"},{"product_id":"celestron-23mm-2-82-luminos","title":"Celestron 23mm 2\" 82° Luminos Eyepiece","description":"This 2\" Celestron Luminos 23mm eyepiece is a six-lens design with a very wide 82° field and minimal field curvature. This makes it particularly well-suited for use with flat field telescopes such as Celestron EdgeHD and Meade Advanced Coma-Free flat field catadioptric scopes and refractors with field flatteners. an excellent low power, It is also well-matched to big Dobsonian scopes. It has a 5.1mm exit pupil with an f\/4.5 scope. That's an exit pupil more in line with the maximum dilated pupil of most observers' eyes to give you the full light-gathering of your big scope.\n\u003cp\u003eThe 23mm Celestron Luminos gives you no-holds-barred low power deep space views with scopes having focal ratios down to f\/4. It is marvelous for open clusters, nebulas, and globular clusters with any scope, and is very effective with fast f\/ratio reflectors and refractors. That being said, it must also be noted that its very wide field also makes it convenient for moderate power lunar and planetary observing with larger Dobsonians, as you have much longer to observe before the planet drifts out of the field and the scope has to be repositioned. \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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e82\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e23mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40221673750601,"sku":"CL8223","price":249.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/19458.jpg?v=1662968015"},{"product_id":"explore-scientific-9mm-120-field-argon-purged-waterproof-2-eyepiece","title":"Explore Scientific 9mm 120° field argon-purged waterproof 2\" eyepiece","description":"\u003cp\u003eA first from Explore Scientific, this 2\" 9mm deep sky eyepiece has an immense 120° field that seems to make your telescope disappear and plunge you headfirst into the Universe.\u003c\/p\u003e\n\u003cp\u003eThe 9mm Explore Scientific has a hyperwide apparent field of view that's an immense 120° across! It's the widest field of view available in any commercial eyepiece. An astronomy first from Explore Scientific, the 120° apparent field of this new 9mm Explore Scientific shows more than twice the sky area of an 82° eyepiece and even a whopping 44% larger area than a 100° eyepiece.\u003c\/p\u003e\n\u003cp\u003eThe prototype 9mm was field-tested for the first time at Starfest in Canada, August 2011. Experienced astronomers who waited in line to get a chance to view through the hyperwide 120° Explore Scientific 9mm were stunned by the full-immersion observing experience. Even when compared with a 9mm 100° field eyepiece, the difference was \"quite palpable,\" to quote one experienced observer. The telescope seemed to truly disappear in the 120° field, bringing them face to face with the Universe in an intimate and personal way never before possible. It's an awe-inspiring observing experience you can repeat for yourself every night you go out with your scope.\u003c\/p\u003e\n\u003cp\u003eThis deep sky eyepiece, the first of its kind for astronomy, produces a highly corrected field across its entire 120° apparent field. The views of compact globular clusters, nebulas, and galaxies are breathtaking. You can use the field of view calculator under the formula tab above to see just how much sky the Explore Scientific can reveal with your telescope.\u003c\/p\u003e\n\u003cp\u003eThe Explore Scientific 9mm is designed specifically for nighttime deep sky observing. It is not an eyepiece for daytime use and will show some lateral color at the edges of the very wide field in daytime use. This lateral color is not visible during the nighttime observing at which this unique eyepiece is designed to excel.\u003c\/p\u003e\n\u003cp\u003eThis 2\" Explore Scientific 120° eyepiece is O-ring sealed and \u003cem\u003eargon-purged\u003c\/em\u003e to be 100% waterproof. Internally sealing the eyepiece and purging it with inert, dry argon gas (which has lower permeability through the eyepiece's polymer seals than nitrogen) prevents internal fogging in the eyepiece when observing at sub-freezing temperatures. For observers in dusty climates, sealing keeps wind-blown dust and fine particulates from getting into the eyepiece body. For observers in very humid climates, sealing prevents the growth of fungus on the internal lens elements. For all observers, complete sealing maximizes the life of the internal optical coatings and makes the eyepiece easier to clean, as there is no risk of cleaning solution migrating from the top of the lens and seeping around edges to be trapped in between elements.\u003c\/p\u003e\n\u003cp\u003eThe 9mm Explore Scientific eyepiece, has high contrast and full field sharpness - with well-controlled astigmatism, field curvature, and lateral color. Its twelve element\/eight group optical system (using lenses of dense crown, light crown, dense flint, and lanthanum rare earth optical glasses with 15-layer multicoatings on all air\/glass surfaces) is designed for maximum field\/high power deep space use with telescopes having focal ratios down to f\/4 and below.\u003c\/p\u003e\n\u003cp\u003eIts very wide field makes this 9mm eyepiece convenient for observing with Dobsonians, as you have much longer to observe before an object drifts out of the field and the scope has to be repositioned than you do with a 70° or 82° (or even 100°) field eyepiece.\u003c\/p\u003e\n\u003cp\u003eThere is a soft rolldown eyecup to shield your eye from ambient light (from a neighbor's security light, for example) and improve the image contrast. The eye relief is a comfortable 13mm.\u003c\/p\u003e\n\u003cp\u003eThe 9mm Explore Scientific fits 2\" focusers only. A shallow tapered groove is machined into the 2\" chrome barrel to engage your focuser thumbscrew or compression ring. This helps prevent the eyepiece from falling should the thumbscrew accidentally loosen while observing. The sides of the groove are slanted to avoid catching on your focuser's compression ring when removing the eyepiece from your scope.\u003c\/p\u003e\n\u003cp\u003eThis individually serial numbered Explore Scientific eyepiece is backedby a limited one year warranty, which will be extended to an ExploreScientific \u003cem\u003etransferable product lifetime\u003c\/em\u003e limited warranty when its warranty card is registered with Explore Scientific within 60 days of purchase.With the extended product lifetime warranty, this Explore Scientificeyepiece will be protected for as long as it continues to bemanufactured, plus an additional five years. Full details on this \u003ca href=\"https:\/\/www.astronomics.com\/explore-scientific-warranty-information_t.aspx\"\u003eunique transferable lifetime warranty\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":40221674012745,"sku":"ES12009","price":899.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/120_9mm_965x965_3bc03bfe-2753-4273-b3b3-f8d1b3427c94.webp?v=1722356783"},{"product_id":"tele-vue-4-7mm-1-25-2-110-field-ethos-sx","title":"TeleVue 4.7mm 1.25\"\/2\" 110° Field Ethos-SX Eyepiece","description":"\u003cp\u003eNearly half a century ago, Al Nagler designed the optics for the LEM (Lunar Excursion Module) simulator that was used to train NASA astronauts how to land on the Moon during the Apollo program. From Apollo 11 through Apollo 17, every astronaut pilot who landed on the Moon trained using Al's optics to learn how to do it.\u003c\/p\u003e\n\u003cp\u003eYears after the LEM program ended, the memory of the 110° view of the simulated lunar surface seen through the window of the LEM simulator inspired Al to develop an \"Ultra Wide Angle\" telescope eyepiece to approach that lunar landing \"simulator experience.\" That eyepiece was the famed 82° field Nagler. When the first Nagler hit the observing fields, it changed forever how amateur astronomers viewed the heavens. An early customer dubbed it a \"spacewalk\" view.\u003c\/p\u003e\n\u003cp\u003eBut the 82° Naglers, and even the recent 100° field Ethos eyepieces, didn't duplicate the original 110° LEM simulator experience Al remembered so fondly. So Al pushed Ethos designer Paul Dellechiaie to extend the field of the Ethos design to reach a full 110°, the same astonishing field as the LEM simulator. The first result was the 3.7mm Ethos-SX (\u003cstrong\u003eS\u003c\/strong\u003eimulator e\u003cstrong\u003eX\u003c\/strong\u003eperience) eyepiece - a \u003cstrong\u003e\u003cem\u003eSky \u0026amp; Telescope Hot Product for 2011\u003c\/em\u003e\u003c\/strong\u003e. Now the 110° experience has been extended with a 4.7mm Ethos-SX.\u003c\/p\u003e\n\u003cp\u003eEssentially, \"the experience\" is about creating an image as natural as one sees with the unaided eye - with no visible field stop to limit the view. With Paul's help, Al's initial dream for amateur astronomers is now fully realized. The 4.7mm Ethos-SX is designed and crafted to combine its exceedingly wide field of view with all the contrast, color-rendition, distortion correction, and center-to-edge sharpness needed to achieve that natural view.\u003c\/p\u003e\n\u003cp\u003eBeyond the desire to simply achieve 110°, the extended field of view gave TeleVue the ability to produce a superb planetary eyepiece with a deep sky true field of view in a focal length that slots nicely between the 110° field 3.7mm Ethos-SX and the 6mm 100° field Ethos.\u003c\/p\u003e\n\u003cp\u003eThe 4.7mm is a 1.25\" format eyepiece and is parfocal with a wide range of 1.25\" TeleVue eyepieces. It can be used with the TeleVue DIOPTRX eyesight astigmatism corrector. The included screw-on 2\" adapter lets you use the 4.7mm Ethos-SX in a 2\" star diagonal or focuser.\u003c\/p\u003e\n\u003cp\u003eWe don't think we can aptly describe Al's original experience of \"flying over the moon\" in the LEM simulator, but for the first time, YOU can experience what the astronauts saw four decades ago. For example, with a TV-102 refractor (or any similar 880mm focal length scope), the actual field of view is 0.58°, so that the entire full Moon fits into the eyepiece field - \u003cem\u003ebut at a magnification of 187x! \u003c\/em\u003eTalk about getting up close and personal with the lunar surface!\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1.25\"\/2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e15mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e110\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e4.7mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e18.4 oz\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","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":40221674045513,"sku":"TE04","price":745.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/ETH_04.7_Ethos_4.7_v1copy.jpg?v=1723669416"},{"product_id":"2-48mm-brandon","title":"Vernonscope 2\" 48mm Brandon Eyepiece","description":"\u003cp\u003eThe 2\" 48mm Vernonscope Brandon eyepiece is designed for nigh-perfect low power deep sky observing with any telescope type that can use 2\" eyepieces, at focal ratios of f\/7 and above. With shorter focal length telescopes, the exit pupil will become larger than your dark-adapted eye's pupil, wasting some of your scope's light-gathering capability.\u003c\/p\u003e\n\u003cp\u003eEmission and reflection nebulas, planetary nebulas, globular clusters, open clusters - all look superb against the dark sky background of the tack-sharp, high contrast, 48mm Brandon. Observers typically comment that the 48mm Vernonscope Brandon seems to make their telescopes disappear. They say that looking through the Brandon is like looking at the sky with your bare eye, only with everything larger and sharper, as if the telescope and eyepiece didn't exist.\u003c\/p\u003e\n\u003cp\u003eEye relief is very long, at 40mm, allowing titaslly unvignetted use with eyeglasses. There is no rubber eyeguard, so keeping your eye centered on the exit pupil to prevent momentary blackouts can be a minor issue until you become familiar with the eyepiece.\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e40mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e46\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e48mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e10.4 oz.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e\n\u003cp\u003eLimited Lifetime\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Vernonscope","offers":[{"title":"Default Title","offer_id":40221674111049,"sku":"VB48","price":375.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/2019-07-20_18_15_35_mwg_0860_48mm_2_inch_eyepiece-jyc3cjmodpnj.jpg?v=1723837563"},{"product_id":"celestron-31mm-2-82-luminos","title":"Celestron 31mm 2\" 82° Luminos Eyepiece","description":"This 2\" Celestron 31mm Luminos is an excellent low power eyepiece with an exceptionally wide field of view, one so wide you have to move your head from side to side to see it all. The six-lens design is primarily designed for no-holds-barred low power deep space use. It is particularly well-suited to get the maximum image brightness and field of view out of big Dobsonian scopes, but will work well with any telescope that can use 2\" eyepieces, even an f\/15 Maksutov.\n\u003cp\u003eThis eyepiece has a very large 6.9mm exit pupil with an f\/4.5 scope, larger than some observers' eyes can dilate. That can effectively waste some of the scope's light gathering capacity, as some of the full light cone will fall on the older observer's iris, rather than entering his or her eye. Even so, some observers willingly trade a little light gathering for the immense field of view of this 82° apparent field eyepiece. This eyepiece very much provides a true \"picture window of space\" view.\u003c\/p\u003e\n\u003cp\u003eYou can use the calculator below to see just how wide the field will be with your particular telescope. For example, it will give you a 2.22° field at 37x with a 10\" f\/4.5 Dobsonian, more than enough to take in all of the Pleiades at one time. This gives you over eight minutes of uninterrupted observing with such a scope while an object drifts from one side of the eyepiece's flat field to the other. That's plenty of time for multiple observers to look at the same object, or for you to absorb as much detail as possible, before having to reposition the scope.\u003c\/p\u003e\n\u003cp\u003eWith a factory-specified eye relief of 27mm, the 31mm Luminos will provide fully unvignetted views for most eyeglass wearers. However, since the 82° field is so wide that you can't see the full field without having to move your head from side to side to take it all in anyway, vignetting in the conventional sense is not a problem in any case.\u003c\/p\u003e\n\u003cp\u003eAt 40 ounces, the 2\" 31mm Luminos is a \u003cem\u003every \u003c\/em\u003esubstantial eyepiece. Be sure that your star diagonal is very firmly locked in place on your scope before inserting this eyepiece to avoid the chance of the diagonal swiveling unexpectedly and the eyepiece falling to the ground.\u003c\/p\u003e\n\u003cp\u003eThe retractable eyeguard raises by turning the broad rubber grip ring around the eyepiece barrel clockwise and lowers by turning the ring back counterclockwise. The eyeguard mechanism may be a little stiff in operation the first time you raise it.\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%;\"\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e27mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e82\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e31mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e40 oz.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40481972093001,"sku":"CL8231","price":299.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/93435-Luminos_570x380_2x_9d6e0831-94a8-48ca-870a-81197fbe8fbd.webp?v=1721419488"},{"product_id":"explore-scientific-5-5mm-100-field-waterproof-2-eyepiece","title":"Explore Scientific 5.5mm 100° Field Waterproof 2\" Eyepiece","description":"\u003cp\u003eThe Explore Scientific 5.5mm argon-purged waterproof 2\" eyepiece combines a high power capability with a 100° apparent field to provide a jaw-dropping observing experience in your telescope.\u003c\/p\u003e\n\u003cp\u003eThe 5.5mm 100° field argon-purged Explore Scientific eyepiece is designed to provide a spectacular maximum field\/high power image with telescopes having focal ratios as fast as f\/4. Its very wide field also makes it convenient for moderate power lunar and planetary observing with Dobsonians, as you have much longer to observe before the planet drifts out of the field and the scope has to be repositioned. That said, it is worth noting that the new 5.5mm Explore Scientific is marvelous for open clusters, nebulas, galaxy clusters, and globular clusters with any telescope capable of using a 2” eyepiece.\u003c\/p\u003e\n\u003cp\u003eThe 100° apparent field of this 5.5mm Explore Scientific eyepiece is nearly 50% larger in area than an 82° field eyepiece. You could get a similar true field with a longer focal length (but narrower apparent field) conventional eyepiece, but the 5.5mm Explore Scientific Explore Scientific has the benefits of the higher power and darker sky backgrounds that are inherent in its shorter focal length.\u003c\/p\u003e\n\u003cp\u003eThe new 5.5mm Explore Scientific 100° field 2” eyepiece is O-ring sealed and argon-purged to be 100% waterproof. While waterproofing might seem important only for observing underwater, waterproofing serves five useful purposes for the astronomical observer as well.\u003c\/p\u003e\n\u003cp\u003eOne, internally sealing the eyepiece and purging it with inert, dry nitrogen gas prevents internal fogging in the eyepiece when observing at very low temperatures. Two, for observers in dusty climates, it halts the intrusion of wind-blown dust and fine particulates into the eyepiece body. Three, for observers in very humid climates, it prevents the growth of fungus on the internal lens elements. Four, for all observers, it maximizes the life of the internal optical coatings. And finally, five, the waterproof 5.5mm Explore Scientific eyepiece is easier to clean, as there is no risk of cleaning solution migrating from the top of the lens and seeping around edges to be trapped in between elements. To insure a perfect seal, Explore Scientific tests every eyepiece in one meter of water for 30 minutes before shipping.\u003c\/p\u003e\n\u003cp\u003eThere is a soft rolldown eyecup to shield the eye from ambient light (from a neighbor’s security light, for example) and improve the image contrast. At an eye relief of 12.5mm, the 5.5mm Explore Scientific would normally somewhat vignette the field of view for eyeglass wearers. However, since the 100° field is so wide that you can’t see the full field without having to move your head from side to side to take it all in anyway, vignetting in the conventional sense is not a problem.\u003c\/p\u003e\n\u003cp\u003eThe 5.5mm Explore Scientific has high contrast, comfortable eye relief, and full field sharpness – with well-controlled astigmatism, field curvature, and lateral color. The 5.5mm Explore Scientific fits 2\" focusers only. A safety groove is machined into the 2\" chrome barrel to engage your focuser thumbscrew. This helps prevent the eyepiece from falling should the thumbscrew accidentally loosen while observing.\u003c\/p\u003e\n\u003cp\u003eThis individually serial numbered Explore Scientific eyepiece 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\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":40481972125769,"sku":"ES05","price":299.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/EPWP10055-01_3_2000x2000_04e50e19-f0fb-4717-ba33-2417a2e640bd.webp?v=1722018745"},{"product_id":"explore-scientific-25mm-100-field-argon-purged-waterproof-2-eyepiece","title":"Explore Scientific 25mm 100° Field Argon-Purged Waterproof 2\" Eyepiece","description":"\u003cp\u003eThe 100° apparent field of this Explore Scientific first-of-its-kind 25mm argon-purged waterproof 2\" eyepiece provides superb maximum field\/medium power observing in all scopes, from small apo refractors to the largest Dobsonians and catadioptrics.\u003c\/p\u003e\n\u003cp\u003eThe new 25mm Explore Scientific 100° field 2\" eyepiece is O-ring sealed and argon-purged to be 100% waterproof. To insure a perfect seal, Explore Scientific tests every eyepiece in one meter of water for 30 minutes before shipping.\u003c\/p\u003e\n\u003cp\u003eInternally sealing the eyepiece and purging it with inert, dry argon gas prevents internal fogging in the eyepiece when observing at sub-freezing temperatures. For observers in dusty climates, sealing keeps wind-blown dust and fine particulates from getting into the eyepiece body. For observers in very humid climates, sealing prevents the growth of fungus on the internal lens elements. For all observers, complete sealing maximizes the life of the internal optical coatings and makes the eyepiece easier to clean, as there is no risk of cleaning solution migrating from the top of the lens and seeping around edges to be trapped in between elements.\u003c\/p\u003e\n\u003cp\u003eThe 25mm Explore Scientific eyepiece has high contrast, comfortable eye relief, and full field sharpness - with well-controlled astigmatism, field curvature, and lateral color. Its optical system (using lenses of dense crown, light crown, dense flint, and lanthanum rare earth optical glasses) is designed for maximum field\/medium power deep space use with telescopes having focal ratios down as low as f\/4. It is exceptionally effective on nebulas with fast f\/ratio reflectors, such as Dobsonians, as it gives both an immense field and a bright exit pupil (over 5.5mm with the typical f\/4.5 Dob). Its very wide field also makes it convenient for moderate power lunar and globular cluster observing with Dobsonians, as you have much longer to observe before the planet drifts out of the field and the scope has to be repositioned than you do with a 60° or 70° (or even 82°) field eyepiece. In addition to Dobs, the new 25mm Explore Scientific Explore Scientific is marvelous for observing open clusters, nebulas, galaxy clusters, and globular clusters with any telescope capable of using a 2\" eyepiece.\u003c\/p\u003e\n\u003cp\u003eThe 100° apparent field of this new 25mm Explore Scientific eyepiece is nearly 50% larger in area than an 82° field eyepiece. You \u003cem\u003ecould \u003c\/em\u003eget a similar true field with a longer focal length (but narrower apparent field) conventional eyepiece, but the 25mm Explore Scientific Explore Scientific has the benefits of the higher power and darker sky backgrounds that are inherent in its shorter focal length. \u003c\/p\u003e\n\u003cp\u003eThere is a soft rolldown eyecup to shield your eye from ambient light (from a neighbor's security light, for example) and improve the image contrast.\u003c\/p\u003e\n\u003cp\u003eThe 25mm Explore Scientific fits 2\" focusers only. A safety groove is machined into the 2\" chrome barrel to engage your focuser thumbscrew. This helps prevent the eyepiece from falling should the thumbscrew accidentally loosen while observing.\u003c\/p\u003e\n\u003cp\u003eThis individually serial numbered Explore Scientific eyepiece is backed by a limited one year warranty, which will be extended to an Explore Scientific \u003cem\u003etransferable lifetime\u003c\/em\u003e limited warranty when its warranty card is registered with Explore Scientific within 60 days of purchase. Here's a link to full details on this \u003ca href=\"https:\/\/www.astronomics.com\/explore-scientific-warranty-information_t.aspx\"\u003eunique transferable lifetime warranty\u003c\/a\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e14mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 lbs, 10 oz\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":40481972158537,"sku":"ES25","price":899.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/EPWP10025-01_1_2000x2000_bdaa229a-baa0-4b2b-a1ce-b799dbb94b86.webp?v=1722012940"},{"product_id":"celestron-luminos-2-5x-4-element-barlow-for-2-and-1-25-eyepieces","title":"Celestron Luminos 2.5X 4-Element Barlow For 2\" And 1.25\" Eyepieces  93436","description":"\u003cp\u003eThis 2.5x magnification Celestron Luminos 2\" Barlow uses a four-lens fully multicoated optical system to provide a flat field and apochromatic-quality spurious color free optical performance. Affordably-priced, it is optically corrected for use with any eyepiece type and telescope combination and comes with an adapter to allow you to use either 2\" or 1.25\" eyepieces.\u003cbr\u003e\u003cbr\u003eIn addition to full multicoatings, the Celestron Luminos Barlow has blackened lens edges and internal antireflection threading to virtually eliminate internal reflections. This assures high contrast images when observing bright targets, such as the Moon and planets. A 28mm clear aperture minimizes vignetting, even when used with wide angle 2\" eyepieces.\u003cbr\u003e\u003cbr\u003eThe 2\" barrel of the Celestron Luminos Barlow is threaded to accept standard 2\" color and light pollution filters. Its compact 3.66\" length (with the 1.25\" adapter) allows you to use it comfortably in star diagonals. It is only 3.15\" long when the 1.25\" adapter is removed for use with 2\" eyepieces. \u003cbr\u003e\u003cbr\u003eNon-marring brass compression rings with large thumbscrews hold your eyepieces securely in place in both the 2\" barrel and the 1.25\" adapter without marring the eyepiece barrels as an ordinary Barlow thumbscrew can. There's a broad rubber grip ring for a firm hold while handling the Celestron Luminos Barlow while wearing gloves in cold weather. The Luminos Barlow comes in a soft vinyl drawstring pouch for storage.\u003cbr\u003e\u003cbr\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e3.66\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2.5x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e11 oz.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":40481973993545,"sku":"CLUM25X","price":159.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/93436-Luminos-Barlow_01_570x380_2x_cbf8b611-ccce-4865-a609-30ed3a3e1516.webp?v=1721768236"},{"product_id":"explore-scientific-28mm-68-field-argon-purged-waterproof-2-eyepiece","title":"Explore Scientific 28mm 68° Field Argon-Purged Waterproof 2\" Eyepiece","description":"\u003cp\u003eThis Explore Scientific 28mm argon-purged is a substantial 2\" eyepiece that gives impressively sharp and contrasty wide field views of nebulas, compact open clusters, globular clusters, etc. with virtually any telescope that can use 2\" eyepieces.\u003c\/p\u003e\n\u003cp\u003eThis new 68° 28mm Explore Scientific is a high-quality low to medium power wide field 2\" eyepiece with an unusual benefit. It is O-ring sealed and argon-purged to be 100% waterproof. This prevents internal fogging in the eyepiece; keeps the interior dust-and fungus-free; and makes it easier to clean, as there is no risk of excess cleaning solution getting trapped between the lenses.\u003c\/p\u003e\n\u003cp\u003eMany observers feel that a 68° field eyepiece like this Explore Scientific hits the \"sweet spot\" between the affordable, but \"looking down a tube\" view of conventional 45°-50° field eyepieces, and the \u003cem\u003efull-immersion, \u003c\/em\u003ebut very expensive, observing experience of an ultra-wide field 82° or 100° eyepiece.\u003c\/p\u003e\n\u003cp\u003eThe 2\" 28mm Explore Scientific is designed for the serious deep space explorer - no matter what your telescope type. The calculator in the \"formula\" tab above will show you just how wide the field will be with your particular telescope. For example, the 28mm Explore Scientific will give you a 0.95 degree field at 71x with the 2000mm focal length of either a \u003cem\u003ebig \u003c\/em\u003e17.5\" f\/4.5 Dobsonian or an 8\" f\/10 Schmidt-Cassegrain. That's almost two lunar diameters and is ideal for observing emission and reflection nebulas and nebula remnants.\u003c\/p\u003e\n\u003cp\u003eWhile it's particularly well-suited for use with Dobsonians (it provides a huge 6.2mm exit pupil for rich field observing on an f\/4.5 scope, close to the maximum usable), it can provide \"picture window onto space\" images with any telescope that can use a 2\" eyepiece. With a short focal length refractor such as the TeleVue TV-85, for example, it will give you a huge 3.17° field at 21x. This eyepiece would be a welcome addition to any serious eyepiece collection.\u003c\/p\u003e\n\u003cp\u003eThe eye relief of this six lens\/fully multicoated is an excellent 22mm. That means that this 28mm Explore Scientific can be used by most eyeglass wearers with no vignetting of the field of view. The eyepiece has a soft fold-down rubber eyecup and comes with dust covers for both ends of the eyepiece.\u003c\/p\u003e\n\u003cp\u003eThis individually serial numbered Explore Scientific eyepiece is backed by a limited one year warranty, which will be extended to an Explore Scientific \u003cem\u003etransferable lifetime limited warranty \u003c\/em\u003ewhen its warranty card is registered with Explore Scientific within 60 days of purchase. Here's a link to the full details on this \u003ca href=\"https:\/\/www.astronomics.com\/explore-scientific-warranty-information_t.aspx\"\u003eunique transferable lifetime warranty\u003c\/a\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e22mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e68\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e28mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e16 oz.\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":40481976090697,"sku":"ES6828A","price":169.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/28_1200x1200_31d33f31-89fb-4914-940c-21ae972cee3f.webp?v=1722013098"},{"product_id":"explore-scientific-34mm-68-field-argon-purged-waterproof-2-eyepiece","title":"Explore Scientific 34mm 68° Field Argon-Purged Waterproof 2\" Eyepiece","description":"\u003cp\u003eThis Explore Scientific 34mm argon-purged 2\" is a big eyepiece - big in size, big in weight, big in field of view, big in performance. It gives you impressively sharp high contrast images with virtually any telescope with a focal ratio of f\/5 and above that uses 2\" eyepieces.\u003c\/p\u003e\n\u003cp\u003eThis new 68° 34mm Explore Scientific is a high-quality and physically-impressive low power wide field 2\" eyepiece for the serious deep space explorer. It comes with an unusual benefit. It is O-ring sealed and argon-purged to be 100% waterproof. This prevents internal fogging in the eyepiece; keeps the interior dust-and fungus-free; and makes it easier to clean, as there is no risk of excess cleaning solution getting trapped between the lenses.\u003c\/p\u003e\n\u003cp\u003eMany observers feel that a 68° field eyepiece like this Explore Scientific hits the \"sweet spot\" between the affordable, but \"looking down a tube\" view of conventional 45°-50° field eyepieces, and the \u003cem\u003efull-immersion, \u003c\/em\u003ebut very expensive, observing experience of an ultra-wide field 82° or 100° eyepiece.\u003c\/p\u003e\n\u003cp\u003eThe 2\" 34mm Explore Scientific is ideal for observing galaxy clusters, large emission and reflection nebulas, and nebula remnants. - no matter what your telescope type, as long as your telescope has a focal ratio of f\/5 and longer. A shorter focal ratio will waste some of your scope's light gathering capacity when used with the 34mm Explore Scientific.\u003c\/p\u003e\n\u003cp\u003eFor example, an f\/4.5 Dobsonian reflector will have a huge 7.55mm exit pupil with this 34mm eyepiece, a larger light cone than your eye can probably dilate to accept. Some of the scope's light will therefore fall on your iris instead of entering your eye, wasting the light. If your scope's focal ratio is f\/5 or above, however, this 34mm Explore Scientific can give you some truly excellent \"big picture\" views of deep space. \u003c\/p\u003e\n\u003cp\u003eWith a huge 26mm of usable eye relief, the six lens\/fully multicoated 34mm Explore Scientific can be used by eyeglass wearers with no vignetting of the field. The eyepiece has a soft fold-down rubber eyecup and comes with dust covers for both ends of the eyepiece.\u003c\/p\u003e\n\u003cp\u003eThis individually serial numbered Explore Scientific eyepiece is backed by a limited one year warranty, which will be extended to an Explore Scientific \u003cem\u003etransferable lifetime limited warranty \u003c\/em\u003ewhen its warranty card is registered with Explore Scientific within 60 days of purchase. Here's a link to the full details on this \u003ca href=\"https:\/\/www.astronomics.com\/explore-scientific-warranty-information_t.aspx\"\u003eunique transferable lifetime warranty\u003c\/a\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e26mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e68\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e34mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e24 oz.\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":40481976123465,"sku":"ES6834A","price":219.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/34_1200x1200_d0e31417-c4ad-49ef-80e9-4e2037363dbe.webp?v=1722016008"},{"product_id":"explore-scientific-40mm-68-field-argon-purged-waterproof-2-eyepiece","title":"Explore Scientific 40mm 68° Field Argon-Purged Waterproof 2\" Eyepiece","description":"\u003cp\u003eIf you have room in your observing kit for only one long focal length wide angle eyepiece, this Explore Scientific 40mm argon-purged eyepiece may well be the one eyepiece for you.\u003c\/p\u003e\n\u003cp\u003eThis new 68° 40mm Explore Scientific is a high-quality and physically-impressive low power wide field 2\" eyepiece for the serious deep space explorer. It comes with an unusual benefit. It is O-ring sealed and argon-purged to be 100% waterproof. This prevents internal fogging in the eyepiece; keeps the interior dust-and fungus-free; and makes it easier to clean, as there is no risk of excess cleaning solution getting trapped between the lenses.\u003c\/p\u003e\n\u003cp\u003eMany observers feel that a 68° field eyepiece like this Explore Scientific hits the \"sweet spot\" between the affordable, but \"looking down a tube\" view of conventional 45°-50° field eyepieces, and the \u003cem\u003efull-immersion, \u003c\/em\u003ebut very expensive, observing experience of an ultra-wide field 82° or 100° eyepiece.\u003c\/p\u003e\n\u003cp\u003eBecause of its long focal length, the 2\" 40mm Explore Scientific is at its best with telescopes having a focal ratio of f\/6 or longer (an f\/6 scope gives it a 6.67mm exit pupil, about the largest most observers can fully utilize). A shorter focal ratio will waste some of your scope's light gathering capacity when used with the 40mm Explore Scientific. If your scope's focal ratio is f\/6 or above, however, this wide field eyepiece can give you some truly excellent \"big picture\" views of deep space. It is ideal for observing galaxy clusters, large emission and reflection nebulas, and nebula remnants - no matter what your telescope type, as long as your telescope has a focal ratio of f\/6 and longer. You can use the calculator in the \"formula\" tabe above to see just how wide the field will be with your particular scope.\u003c\/p\u003e\n\u003cp\u003eWith a huge 31mm of usable eye relief, the six lens\/fully multicoated 40mm Explore Scientific can be used by eyeglass wearers with no vignetting of the field. The eyepiece has a soft fold-down rubber eyecup and comes with dust covers for both ends of the eyepiece.\u003c\/p\u003e\n\u003cp\u003eThis individually serial numbered Explore Scientific eyepiece is backed by a limited one year warranty, which will be extended to an Explore Scientific \u003cem\u003etransferable lifetime limited warranty \u003c\/em\u003ewhen its warranty card is registered with Explore Scientific within 60 days of purchase. Here's a link to the full details on this \u003ca href=\"https:\/\/www.astronomics.com\/explore-scientific-warranty-information_t.aspx\"\u003eunique transferable lifetime warranty\u003c\/a\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e31mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e68\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e40mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e34.4 oz\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":40481976156233,"sku":"ES6840A","price":309.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/40_1200x1200_b1453953-28cc-4573-8359-0ef1db8fa4c8.webp?v=1722018619"},{"product_id":"explore-scientific-18mm-82-field-argon-purged-waterproof-2-eyepiece","title":"Explore Scientific 18mm 82° Field Argon-Purged Waterproof 2\" Eyepiece","description":"\u003cp\u003eThis 82° field Explore Scientific 18mm 2\" argon-purged waterproof eyepiece makes observing with many telescopes feel like you're taking a stroll through the cosmos rather than looking through an eyepiece.\u003c\/p\u003e\n\u003cp\u003eThis 2\" 18mm Explore Scientific is an exceptional medium focal length eyepiece with a wide, wide 82° field. It makes observing feel like you're floating above the Earth, taking a space walk, rather than looking through a telescope eyepiece, particularly with short focal length scopes such as fast focal ratio apo refractors or Dobsonian reflectors.\u003c\/p\u003e\n\u003cp\u003eIn addition to its wide field, the 18mm Explore Scientific has an extra benefit for you. It is O-ring sealed and nitrogen-purged to be 100% waterproof. This prevents internal fogging in the eyepiece; keeps the interior dust-and fungus-free; and makes it easier to clean, as there is no risk of excess cleaning solution getting trapped between the lenses.\u003c\/p\u003e\n\u003cp\u003eThe latest computer design programs have been used to optimize its performance. Its six element\/four group design uses low dispersion and high refractive index lenses and full multicoatings for high contrast, high resolution, and flat field images across its very wide 82° field of view. The lens edges have been blackened to improve contrast.\u003c\/p\u003e\n\u003cp\u003eA 10\" f\/4.5 Dobsonian reflector will have a full 1.29° field at 63.5x with this eyepiece, able to encompass all of the Pleiades in one field. Even an 8\" f\/10 catadioptric will have a field almost one and a half lunar diameters across, able to encompass the full Moon with room to spare, the Orion Nebula, and many globular clusters, as well. \u003c\/p\u003e\n\u003cp\u003eAt 13mm, the eye relief will somewhat vignette the field of view for eyeglass wearers. This isn't as much a problem as you might think, as the 82° field of view is so wide that even non-eyeglass wearers have trouble seeing the whole field at once. All observers have to move their eye from side to side to take in the immense view, so vignetting in the conventional sense is not a problem. This is one of those eyepieces that can truly be described as showing you a \"picture window view\" of space. The visual effect of its long eye-relief and 82° apparent field is truly a full-immersion experience. Your eye is relaxed, allowing you to easily use the \"averted vision\" technique to study faint details across its huge field of view.\u003c\/p\u003e\n\u003cp\u003eThe eyepiece has a soft fold-down rubber eyecup and comes with dust covers for both ends of the eyepiece.\u003c\/p\u003e\n\u003cp\u003eThis individually serial numbered Explore Scientific eyepiece is backed by a limited one year warranty, which will be extended to an Explore Scientific transferable product lifetime limited warranty when its warranty card is registered with Explore Scientific within 60 days of purchase. Here's a link to the full details on this \u003ca href=\"https:\/\/www.astronomics.com\/explore-scientific-warranty-information_t.aspx\"\u003eunique transferable lifetime warranty\u003c\/a\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e13mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e82\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e18mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e14 oz.\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":40481976254537,"sku":"ES8218A","price":189.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/18_1200x1200_ec3bc7fc-fd7d-4929-b62f-f671283d2a1a.webp?v=1722010232"},{"product_id":"explore-scientific-24mm-82-field-argon-purged-waterproof-2-eyepiece","title":"Explore Scientific 24mm 82° Field Argon-Purged Waterproof 2\" Eyepiece","description":"\u003cp\u003eThis 82° field Explore Scientific 24mm 2\" argon-purged waterproof eyepiece makes observing feel like you're relaxing in front of a picture window on the Universe, rather than squinting through an eyepiece.\u003c\/p\u003e\n\u003cp\u003eThis 2\" 24mm Explore Scientific is an excellent low power eyepiece with a wide, wide fully-immersive 82° field of view that's particularly well-matched to big Dobsonian scopes and short focal ratio refractors. Viewing through this 24mm Explore Scientific makes you feel like you're floating above the Earth, taking a space walk, rather than looking through a telescope eyepiece. This is an eyepiece that shows you a truly relaxed and unconfined \"picture window\" view of space.\u003c\/p\u003e\n\u003cp\u003eWhile the longer focal length 30mm Explore Scientific provides an even wider field of view with an f\/4.5 scope, the 30mm also has a very large 6.7mm exit pupil that is larger than many observers' eyes can dilate. That effectively wastes some of a Dob's light gathering capacity, as some of the full light cone falls on the observer's iris, rather than entering his or her eye.\u003c\/p\u003e\n\u003cp\u003eIn addition to its wide field, the 24mm Explore Scientific has an extra benefit for you. It is O-ring sealed and argon-purged to be 100% waterproof. This prevents internal fogging in the eyepiece; keeps the interior dust-and fungus-free; and makes it easier to clean, as there is no risk of excess cleaning solution getting trapped between the lenses.\u003c\/p\u003e\n\u003cp\u003eThe latest computer design programs have been used to optimize its performance. Its six element\/four group design uses low dispersion and high refractive index lenses and full multicoatings for high contrast, high resolution, and flat field images across its very wide 82° field of view. The lens edges have been blackened to improve contrast.\u003c\/p\u003e\n\u003cp\u003eA 12\" f\/4.5 Dobsonian reflector will have a full 1.43° field at 57x with this eyepiece, able to encompass all of the Pleiades in one field. Even an 8\" f\/10 catadioptric will have a 0.98° field almost two lunar diameters across, for thrilling views of the larger nebulas, like Orion. \u003c\/p\u003e\n\u003cp\u003eWith 17mm of eye relief, this Explore Scientific eyepiece provides virtually unvignetted views for eyeglass wearers, although the 82° field of view is so wide that even non-eyeglass wearers can't see the whole field at once. All observers have to move their eye from side to side to take in the immense view, so vignetting in the conventional sense is not a problem.\u003c\/p\u003e\n\u003cp\u003eThe eyepiece has a soft fold-down rubber eyecup and comes with dust covers for both ends of the eyepiece.\u003c\/p\u003e\n\u003cp\u003eThis individually serial numbered Explore Scientific eyepiece is backed by a limited one year warranty, which will be extended to an Explore Scientific \u003cem\u003etransferable lifetime limited warranty \u003c\/em\u003ewhen its warranty card is registered with Explore Scientific within 60 days of purchase.  Here's a link to full details on this \u003ca href=\"https:\/\/www.astronomics.com\/explore-scientific-warranty-information_t.aspx\"\u003eunique transferable lifetime warranty\u003c\/a\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e17mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e82\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e24mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1.6 lbs.\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":40481976582217,"sku":"ES8224A","price":249.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/es8224.jpg?v=1675379095"},{"product_id":"explore-scientific-30mm-82-field-argon-purged-waterproof-2-eyepiece","title":"Explore Scientific 30mm 82° Field Argon-Purged Waterproof 2\" Eyepiece","description":"\u003cp\u003eThis 82° field Explore Scientific 30mm 2\" argon-purged waterproof eyepiece gives you the big picture, making you feel like you're relaxing in front of an expansive picture window on the Universe, rather than squinting through an eyepiece.\u003c\/p\u003e\n\u003cp\u003eThis 2\" 30mm Explore Scientific is an excellent low power eyepiece with an ultra-wide 82° field of view, one so wide you have to move your head from side to side to see it all. It is particularly suited to get the maximum image brightness and field of view out of big Dobsonian scopes, but will work well with any scope that can use 2\" eyepieces, even an f\/15 Maksutov. Viewing through this 30mm Explore Scientific makes you feel like you're floating above the Earth, taking a space walk, rather than looking through a telescope eyepiece. If you want a truly relaxed and unconfined \"picture window\" view of the Universe, this is the eyepiece for you.\u003c\/p\u003e\n\u003cp\u003eWith an f\/4.5 Dobsonian reflector, this 30mm eyepiece has a very large 6.7mm exit pupil larger than some observers' eyes can dilate. That can effectively waste some of the Dob's light gathering capacity for those observers, as some of the full light cone will fall on their iris, rather than entering his or her eye. Even so, many observers are willing to trade a little light gathering for the jaw-dropping fully-immersive view through this 82° apparent field eyepiece. If you want to see the big picture, this is an eyepiece you will treasure for years to come.\u003c\/p\u003e\n\u003cp\u003eIn addition to its wide field, the 30mm Explore Scientific has an extra benefit for you. It is O-ring sealed and argon-purged to be 100% waterproof. This prevents internal fogging in the eyepiece; keeps the interior dust-and fungus-free; and makes it easier to clean, as there is no risk of excess cleaning solution getting trapped between the lenses.\u003c\/p\u003e\n\u003cp\u003eThe latest computer design programs have been used to optimize its performance. Its six element\/four group design uses low dispersion and high refractive index lenses and full multicoatings for high contrast, high resolution, and flat field images across its very wide 82° field of view. The lens edges have been blackened to improve contrast.\u003c\/p\u003e\n\u003cp\u003eA 12\" f\/4.5 Dobsonian reflector gives you a full 1.79° field at 45.7x with this eyepiece, well over three lunar diameters, and easily able to encompass all of the Pleiades or Orion in one field. You get over seven minutes of uninterrupted observing with such a scope while an object drifts from one side of the sharp and flat eyepiece field to the other. That's plenty of time for multiple observers to look at the same object, or for you to absorb as much detail as possible, before having to reposition the scope. Even an 8\" f\/10 catadioptric has a 1.23° field that's almost two and a half lunar diameters across, for thrilling views of the larger nebulas, like the Omega and Orion. \u003c\/p\u003e\n\u003cp\u003eWith 21mm of eye relief, this 30mm Explore Scientific eyepiece provides unvignetted views for eyeglass wearers, although the 82° field of view is so wide that even non-eyeglass wearers can't see the whole field at once. All observers have to move their eye from side to side to see out to the field stop.\u003c\/p\u003e\n\u003cp\u003eThe eyepiece has a soft fold-down rubber eyecup and comes with dust covers for both ends of the eyepiece.\u003c\/p\u003e\n\u003cp\u003eThis individually serial numbered Explore Scientific eyepiece is backed by a limited one year warranty, which will be extended to an Explore Scientific \u003cem\u003etransferable lifetime limited warranty \u003c\/em\u003ewhen its warranty card is registered with Explore Scientific within 60 days of purchase. This link will give you full details on this \u003ca href=\"https:\/\/www.astronomics.com\/explore-scientific-warranty-information_t.aspx\"\u003eunique transferable lifetime warranty\u003c\/a\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e21mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e82\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e30mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2.2 lbs.\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":40481976614985,"sku":"ES8230A","price":299.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/30_1200x1200_5b7493da-ba91-42d6-b808-a411bc89b77f.webp?v=1722014344"},{"product_id":"explore-scientific-9mm-100-field-argon-purged-waterproof-2-eyepiece","title":"Explore Scientific 9mm 100° Field Argon-Purged Waterproof 2\" Eyepiece","description":"\u003cp\u003eThe Explore Scientific 9mm argon-purged waterproof 2\" eyepiece combines a high power capability with a 100° apparent field to provide a jaw-dropping observing experience in scopes ranging from small refractors to the largest Dobsonians and catadioptrics.\u003c\/p\u003e\n\u003cp\u003eThe 9mm 100° field argon-purged Explore Scientific eyepiece is designed to provide a spectacular maximum field\/medium to medium-high power image with telescopes having focal ratios as fast as f\/4. It is exceptionally effective on nebulas with fast f\/ratio reflectors, such as Dobsonians, giving both an immense field and a good 2mm exit pupil with the typical f\/4.5 Dob that is very effective at darkening the sky background so that faint stars and diffuse objects pop out more clearly.\u003c\/p\u003e\n\u003cp\u003eIts very wide field also makes it convenient for moderate power lunar and planetary observing with Dobsonians, as you have much longer to observe before the planet drifts out of the field and the scope has to be repositioned. That said, it is worth noting that the new 9mm Explore Scientific Explore Scientific is marvelous for open clusters, nebulas, galaxy clusters, and globular clusters with \u003cem\u003eany \u003c\/em\u003etelescope capable of using a 2\" eyepiece.\u003c\/p\u003e\n\u003cp\u003eThe 100° apparent field of this 9mm Explore Scientific eyepiece is nearly 50% larger in area than an 82° field eyepiece. You \u003cem\u003ecould \u003c\/em\u003eget a similar true field with a longer focal length (but narrower apparent field) conventional eyepiece, but the 9mm Explore Scientific Explore Scientific has the benefits of the higher power and darker sky backgrounds that are inherent in its shorter focal length. \u003c\/p\u003e\n\u003cp\u003eThe 9mm Explore Scientific 100° field 2\" eyepiece is O-ring sealed and argon-purged to be 100% waterproof. While waterproofing might seem important only for observing underwater, waterproofing serves several five useful purposes for the astronomical observer as well.\u003c\/p\u003e\n\u003cp\u003eOne, internally sealing the eyepiece and purging it with inert, dry nitrogen gas prevents internal fogging in the eyepiece when observing at very low temperatures. Two, for observers in dusty climates, it halts the intrusion of wind-blown dust and fine particulates into the eyepiece body. Three, for observers in very humid climates, it prevents the growth of fungus on the internal lens elements. Four, for all observers, it maximizes the life of the internal optical coatings. And finally, five, the waterproof 9mm Explore Scientific eyepiece is easier to clean, as there is no risk of cleaning solution migrating from the top of the lens and seeping around edges to be trapped in between elements. To insure a perfect seal, Explore Scientific tests every eyepiece in one meter of water for 30 minutes before shipping.\u003c\/p\u003e\n\u003cp\u003eThere is a soft rolldown eyecup to shield the eye from ambient light (from a neighbor's security light, for example) and improve the image contrast. At an eye relief of 12.5mm, the 9mm Explore Scientific would normally somewhat vignette the field of view for eyeglass wearers. However, since the 100° field is so wide that you can't see the full field without having to move your head from side to side to take it all in anyway, vignetting in the conventional sense is not a problem.\u003c\/p\u003e\n\u003cp\u003eThe 9mm Explore Scientific has high contrast, comfortable eye relief, and full field sharpness - with well-controlled astigmatism, field curvature, and lateral color. The 9mm Explore Scientific fits 2\" focusers only. A safety groove is machined into the 2\" chrome barrel to engage your focuser thumbscrew. This helps prevent the eyepiece from falling should the thumbscrew accidentally loosen while observing.\u003c\/p\u003e\n\u003cp\u003eThis individually serial numbered Explore Scientific eyepiece is backed by a limited one year warranty, which will be extended to an Explore Scientific \u003cem\u003etransferable lifetime limited warranty \u003c\/em\u003ewhen its warranty card is registered with Explore Scientific within 60 days of purchase. Here's a link to the full details on this \u003ca href=\"https:\/\/www.astronomics.com\/explore-scientific-warranty-information_t.aspx\"\u003eunique transferable lifetime warranty\u003c\/a\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e12.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e9mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1 lb. 5 oz.\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":40481976647753,"sku":"ES09A","price":299.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/20172.jpg?v=1675379100"},{"product_id":"explore-scientific-14mm-100-field-argon-purged-waterproof-2-eyepiece","title":"Explore Scientific 14mm 100° Field Argon-Purged Waterproof 2\" Eyepiece","description":"\u003cp\u003eThe 100° apparent field of the Explore Scientific 14mm argon-purged waterproof 2\" eyepiece provides incredible maximum field\/medium power observing in scopes ranging from small refractors to the largest Dobsonians and catadioptrics.\u003c\/p\u003e\n\u003cdiv\u003eThe new 14mm Explore Scientific 100° field 2\" eyepiece is O-ring sealed and argon-purged to be 100% waterproof. While waterproofing might seem important only for observing underwater, waterproofing serves several five useful purposes for the astronomical observer as well.\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003cdiv\u003eOne, internally sealing the eyepiece and purging it with inert, dry nitrogen gas prevents internal fogging in the eyepiece when observing at very low temperatures. Two, for observers in dusty climates, it halts the intrusion of wind-blown dust and fine particulates into the eyepiece body. Three, for observers in very humid climates, it prevents the growth of fungus on the internal lens elements. Four, for all observers, it maximizes the life of the internal optical coatings. And finally, five, the waterproof 14mm Explore Scientific eyepiece is easier to clean, as there is no risk of cleaning solution migrating from the top of the lens and seeping around edges to be trapped in between elements. To insure a perfect seal, Explore Scientific tests every eyepiece in one meter of water for 30 minutes before shipping.\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe 14mm Explore Scientific is a nine element optical system using lenses of dense crown, light crown, dense flint, and lanthanum rare earth optical glasses. It is designed for maximum field\/medium power deep space use with telescopes having focal ratios down to f\/4. It is exceptionally effective on nebulas with fast f\/ratio reflectors, such as Dobsonians, giving both an immense field and a bright exit pupil (over 3mm with the typical f\/4.5 Dob). Its very wide field also makes it convenient for moderate power lunar and planetary observing with Dobsonians, as you have much longer to observe before the planet drifts out of the field and the scope has to be repositioned. That said, it is worth noting that the new 14mm Explore Scientific Explore Scientific is marvelous for open clusters, nebulas, galaxy clusters, and globular clusters with \u0026lt;em\u0026gt;any \u0026lt;\/em\u0026gt;telescope capable of using a 2\" eyepiece.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe 100° apparent field of this new 14mm Explore Scientific eyepiece is nearly 50% larger in area than an 82° field eyepiece. You \u0026lt;em\u0026gt;could \u0026lt;\/em\u0026gt;get a similar true field with a longer focal length (but narrower apparent field) conventional eyepiece,  but the 14mm Explore Scientific Explore Scientific has the benefits of the higher power and darker sky backgrounds that are inherent in its shorter focal length.\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003cdiv\u003eThere is a soft rolldown eyecup to shield the eye from ambient light (from a neighbor's security light, for example) and improve the image contrast. At an eye relief of 14.5mm, the 14mm Explore Scientific would normally somewhat vignette the field of view for eyeglass wearers. However, since the 100° field is so wide that you can't see the full field without having to move your head from side to side to take it all in anyway, vignetting in the conventional sense is not a problem.\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe 14mm Explore Scientific has high contrast, comfortable eye relief, and full field sharpness - with well-controlled astigmatism, field curvature, and lateral color. Initial comments from unbiased observers have been uniformly favorable. Here's an example from one experienced observer. \"I've looked at the stars for 30 years and I have never had an eyepiece gave me a wow factor like the Explore Scientific 100 degree 14mm did. At 100 degrees it is an awesome vista to see. Not only were the stars pin-point to the very edges of the field, the contrast was greatly enhanced as well. I was totally blown away, it is incredible.\"\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe 14mm Explore Scientific fits 2\" focusers only. A safety groove is machined into the 2\" chrome barrel to engage your focuser thumbscrew. This helps prevent the eyepiece from falling should the thumbscrew accidentally loosen while observing.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThis individually serial numbered Explore Scientific eyepiece 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\/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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e14.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e14mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1 lb, 14 oz\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\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":40481976680521,"sku":"ES14A","price":349.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/EPWP10014-01_2_1390x1390_e40b0942-317d-4c86-a9d3-deacab8018f5.webp?v=1722009063"},{"product_id":"explore-scientific-17mm-92-field-argon-purged-waterproof-2-eyepiece","title":"Explore Scientific 17mm 92° Field Argon-Purged Waterproof 2\" Eyepiece","description":"\u003cdiv\u003eYou may be startled at the amazingly wide expanse of inky black sky that greets you when you first look into the 92° field of this Explore Scientific 17mm hyper-wide eyepiece. Observing with the 17mm Explore 92° feels more like you are in orbit above the Earth, taking a space walk, rather than looking through a telescope eyepiece. \u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe Explore Scientific 2\" 17mm is one of those eyepieces that can truly be described as showing you a \"picture window view\" of space. The visual effect of its long eye relief and 92° apparent field is truly a full-immersion experience. Your eye is relaxed, allowing you to easily use the \"averted vision\" technique to study faint details across its huge field of view.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eWith an apparent field of view that is close to the maximum possible for a hyper-wide eyepiece design, celestial objects are easier to locate with the Explore 92°. In non-driven telescopes, like Dobsonians or altazimuth mount refractors, an object stays in the field of view for a long time before you need to nudge the scope to center it again.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe 17mm 92° field Explore Scientific is O-ring sealed and argon-purged to be 100% waterproof. This prevents internal fogging in the eyepiece in cold weather; keeps the interior dust-and fungus-free; and makes it easier to clean, as there is no risk of excess cleaning solution getting trapped between the lens elements.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe latest computer design programs have been used to optimize its performance. Its eight element\/six group design uses low dispersion and high refractive index lenses and full multicoatings for high contrast, high resolution, and flat field images across its very wide 92° field of view. The lens edges have been blackened to improve contrast.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eA 10\" f\/4.5 Dobsonian reflector has a full 1.37° field at 67x with this eyepiece, able to encompass all of the Pleiades in one field. Even an 8\" f\/10 catadioptric has a field more than one and a half lunar diameters across, able to encompass the full Moon with room to spare, the Orion Nebula, and many globular clusters, as well. \u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe long 20mm eye relief of the Explore Scientific 92° will not vignette the field of view for eyeglass wearers. The eyepiece has a soft fold-down rubber eyecup for eyeglass use and comes with dust covers for both ends of the eyepiece.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThis individually serial numbered 17mm Explore Scientific 92° field eyepiece is backed by a limited one year warranty, which will be extended to an Explore Scientific transferable product lifetime limited warranty when its warranty card is registered with Explore Scientific within 60 days of purchase. Here's a link to the \u003cspan\u003e\u003ca href=\"https:\/\/www.astronomics.com\/explore-scientific-warranty-information_t.aspx\"\u003efull details on this unique transferable lifetime warranty\u003c\/a\u003e\u003c\/span\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e92\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e17mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 lbs. 9.5 oz.\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\u003c\/div\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":40481979727945,"sku":"ES9217","price":369.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/cq_1200x1200_9bc7762b-437b-4290-bcf2-2a83cbec2f40.webp?v=1722010143"},{"product_id":"explore-scientific-12mm-92-field-argon-purged-waterproof-2-eyepiece","title":"Explore Scientific 12mm 92° Field Argon-Purged Waterproof 2\" Eyepiece","description":"\u003cp\u003eThis 2\" 12mm 92° field Explore Scientific hyper-wide eyepiece provides an exceptionally immersive medium\/medium high power observing experience.\u003c\/p\u003e\n\u003cdiv\u003eYou may be startled at the amazingly wide expanse of inky black sky that greets you when you first look into the 92° field of this Explore Scientific 12mm hyper-wide eyepiece. Observing with the 12mm Explore 92° feels more like you are in orbit above the Earth, taking a space walk, rather than looking through a telescope eyepiece. \u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe Explore Scientific 2\" 12mm is one of those eyepieces that can truly be described as showing you a \"picture window view\" of space. The visual effect of its long eye relief and 92° apparent field is truly a full-immersion experience. Your eye is relaxed, allowing you to easily use the \"averted vision\" technique to study faint details across its huge field of view.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eWith an apparent field of view that is close to the maximum possible for a hyper-wide eyepiece design, celestial objects are easier to locate with the Explore 92°. In non-driven telescopes, like Dobsonians or altazimuth mount refractors, an object stays in the field of view for a long time before you need to nudge the scope to center it again.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe 12mm 92° field Explore Scientific is O-ring sealed and argon-purged to be 100% waterproof. This prevents internal fogging in the eyepiece in cold weather; keeps the interior dust-and fungus-free; and makes it easier to clean, as there is no risk of excess cleaning solution getting trapped between the lens elements.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe latest computer design programs have been used to optimize its performance. Its eight element\/six group design uses low dispersion and high refractive index lenses and full multicoatings for high contrast, high resolution, and flat field images across its very wide 92° field of view. The lens edges have been blackened to improve contrast.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eA 10\" f\/4.5 Dobsonian reflector has a full 0.97° field at 95x with this eyepiece, nearly two lunar diameters across. Even an 8\" f\/10 catadioptric has a field 0.55° in diameter, able to encompass the full Moon with room to spare, the Orion Nebula, and many other nebulas and globular clusters, as well. \u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe long 20mm eye relief of the Explore Scientific 92° will not vignette the field of view for eyeglass wearers. The eyepiece has a soft fold-down rubber eyecup for eyeglass use and comes with dust covers for both ends of the eyepiece.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThis individually serial numbered 12mm Explore Scientific 92° field eyepiece is backed by a limited one year warranty, which will be extended to an Explore Scientific transferable product lifetime limited warranty when its warranty card is registered with Explore Scientific within 60 days of purchase. Here's a link to the \u003cspan\u003e\u003ca href=\"https:\/\/www.astronomics.com\/explore-scientific-warranty-information_t.aspx\"\u003efull details on this unique transferable lifetime warranty\u003c\/a\u003e\u003c\/span\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 id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e92\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e12mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 lbs. 1.9 oz.\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\u003c\/div\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":40481979760713,"sku":"ES9212","price":309.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/12_1_1200x1200_ab5ce826-4b08-40cf-857d-8adb8fa4f6b5.webp?v=1722008787"},{"product_id":"explore-scientific-62-40mm-2-waterproof-eyepiece","title":"Explore Scientific 40mm 62° 2\" Waterproof Eyepiece","description":"\u003cp data-end=\"307\" data-start=\"251\"\u003e\u003cstrong data-end=\"305\" data-start=\"251\"\u003eExplore Scientific 40mm 62° 2\" Waterproof Eyepiece\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"713\" data-start=\"309\"\u003eThe Explore Scientific 40mm 62° Series 2\" Eyepiece is a superb choice for deep-sky observers and planetary imagers looking to maximize field of view, eye relief, and contrast in one premium package. Designed with a wide 62-degree apparent field, this eyepiece delivers immersive views with edge-to-edge sharpness, excellent correction, and long-term durability thanks to its waterproof and purged design.\u003c\/p\u003e\n\u003cp data-end=\"1079\" data-start=\"715\"\u003eThis eyepiece is a great option for low-power sweeping of the night sky, especially when paired with larger focal length telescopes like Schmidt-Cassegrains, Dobsonians, or refractors. With its 40mm focal length and wide-angle design, it’s ideal for scanning open clusters, bright nebulae, and rich star fields with a sense of space and depth that’s hard to match.\u003c\/p\u003e\n\u003ch3 data-end=\"1116\" data-start=\"1081\"\u003eWide Field, Comfortable Viewing\u003c\/h3\u003e\n\u003cp data-end=\"1676\" data-start=\"1118\"\u003eThe 62° apparent field of view strikes a smart balance between expansive sky coverage and manageable size and weight. It's wide enough to feel immersive but without pushing into the realm of ultra-wide designs that sometimes trade off eye relief or introduce edge distortions. In fast focal ratio scopes, this eyepiece maintains a well-corrected image across the field, delivering pinpoint stars and crisp detail. It’s an especially attractive choice for observers who want a more natural, porthole-like view compared to narrower Plössl or Kellner eyepieces.\u003c\/p\u003e\n\u003ch3 data-end=\"1704\" data-start=\"1678\"\u003eExceptional Eye Relief\u003c\/h3\u003e\n\u003cp data-end=\"2032\" data-start=\"1706\"\u003eOne of the key advantages of this eyepiece is its long 28mm of eye relief. That makes it extremely comfortable to use—even for eyeglass wearers—without sacrificing field of view. The twist-up eyecup provides a customizable experience for those who prefer to observe without glasses, while still giving full access to the view.\u003c\/p\u003e\n\u003ch3 data-end=\"2079\" data-start=\"2034\"\u003eWaterproof and Argon-Purged for Longevity\u003c\/h3\u003e\n\u003cp data-end=\"2482\" data-start=\"2081\"\u003eLike all of Explore Scientific’s 62° series eyepieces, the 40mm is fully waterproof and filled with inert argon gas. This design prevents internal fogging, protects against fungus growth, and eliminates dust or moisture infiltration over time. Whether you’re observing in humid summer conditions or taking your scope into colder climates, this eyepiece is built to last and perform without compromise.\u003c\/p\u003e\n\u003ch3 data-end=\"2515\" data-start=\"2484\"\u003eOptical Design and Coatings\u003c\/h3\u003e\n\u003cp data-end=\"2900\" data-start=\"2517\"\u003eThis eyepiece uses a multi-element optical design with fully multi-coated lenses for superior light transmission and contrast. Internal baffling and blackened lens edges reduce internal reflections and scatter, delivering darker backgrounds and cleaner contrast between stars and nebulae. The result is a noticeably rich, high-contrast image that's ideal for low-light deep sky work.\u003c\/p\u003e\n\u003ch3 data-end=\"2919\" data-start=\"2902\"\u003eCompatibility\u003c\/h3\u003e\n\u003cp data-end=\"3226\" data-start=\"2921\"\u003eThe 40mm 62° eyepiece features a 2\" barrel format, making it compatible with any telescope that accepts standard 2\" eyepieces. It's also threaded for 2\" filters, allowing easy integration of nebula filters, light pollution reduction filters, or broadband contrast filters to enhance your viewing sessions.\u003c\/p\u003e\n\u003cp data-end=\"3598\" data-start=\"3228\"\u003eThis eyepiece performs particularly well in telescopes with longer focal ratios (f\/8 and up), but remains a solid performer even in faster optical systems. In large Dobsonian reflectors, it can offer up to a 1.4°–1.7° true field, depending on your scope’s focal length—perfect for capturing the full extent of large objects like the North America Nebula or the Pleiades.\u003c\/p\u003e\n\u003chr data-end=\"3603\" data-start=\"3600\"\u003e\n\u003cp data-end=\"3620\" data-start=\"3605\"\u003e\u003cstrong data-end=\"3620\" data-start=\"3605\"\u003eIn Summary:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"4018\" data-start=\"3622\"\u003eThe Explore Scientific 40mm 62° 2\" Waterproof Eyepiece is an excellent choice for the serious observer seeking immersive wide-field views, premium build quality, and long-term performance. Its optical clarity, generous eye relief, and rugged construction make it a go-to for low-power observing sessions, whether you're sweeping the Milky Way or framing entire star clusters in one majestic view.\u003c\/p\u003e\n\u003cp data-end=\"4212\" data-start=\"4020\"\u003eIf you're ready to take your visual astronomy to the next level, this eyepiece offers an exceptional balance of performance and value—and it’s backed by Explore Scientific’s lifetime warranty.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cmeta charset=\"UTF-8\"\u003e\n\u003ctable id=\"product-attribute-specs-table\" class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e28.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e62°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField Stop\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e42.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e40mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e23.6 ozs\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\u003c\/div\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":40481981825097,"sku":"ES6240","price":259.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/20562.jpg?v=1675379427"},{"product_id":"explore-scientific-62-32mm-2-waterproof-eyepiece","title":"Explore Scientific  32mm 62° 2\" Waterproof Eyepiece","description":"\u003ch3 data-start=\"254\" data-end=\"308\"\u003eExplore Scientific 32mm 62° 2\" Waterproof Eyepiece\u003c\/h3\u003e\n\u003cp data-start=\"310\" data-end=\"693\"\u003eIf you're aiming to take full advantage of your telescope's 2\" focuser for wide-field, low-power views, the \u003cstrong data-start=\"418\" data-end=\"469\"\u003eExplore Scientific 32mm 62° Waterproof Eyepiece\u003c\/strong\u003e delivers beautifully. Designed for immersive deep-sky observing with excellent optical correction, this eyepiece brings expansive vistas and solid mechanical build quality together in a package that won’t empty your wallet.\u003c\/p\u003e\n\u003ch4 data-start=\"695\" data-end=\"755\"\u003eExpansive 62° Apparent Field with True Wide-Field Views\u003c\/h4\u003e\n\u003cp data-start=\"757\" data-end=\"1070\"\u003eThe 62° apparent field of view gives you that wide-screen experience, offering noticeably more sky than standard Plössls or narrow-field designs. In a 32mm focal length, this eyepiece is a low-power powerhouse—excellent for large targets like the Veil Nebula, the Double Cluster, or simply sweeping the Milky Way.\u003c\/p\u003e\n\u003cp data-start=\"1072\" data-end=\"1339\"\u003eBecause it's a 2\" eyepiece, you’re getting \u003cstrong data-start=\"1115\" data-end=\"1145\"\u003emaximum true field of view\u003c\/strong\u003e possible in your scope without stepping into exotic ultra-wide territory or using focal reducers. It makes a perfect finder eyepiece, and a favorite for relaxing, wide-angle deep-sky observing.\u003c\/p\u003e\n\u003ch4 data-start=\"1341\" data-end=\"1391\"\u003eWaterproof and Nitrogen-Purged for Durability\u003c\/h4\u003e\n\u003cp data-start=\"1393\" data-end=\"1654\"\u003eLike all of Explore Scientific’s eyepieces in this series, the 32mm 62° is \u003cstrong data-start=\"1468\" data-end=\"1508\"\u003efully waterproof and nitrogen-purged\u003c\/strong\u003e. That’s not just a nice bonus—it’s a serious feature for anyone observing in dewy conditions, humid climates, or who values long-term durability.\u003c\/p\u003e\n\u003cp data-start=\"1656\" data-end=\"1865\"\u003eThe internal optics are sealed against fogging and moisture, and you can safely clean the exterior without worrying about internal damage. This level of ruggedness is a rarity in eyepieces at this price point.\u003c\/p\u003e\n\u003ch4 data-start=\"1867\" data-end=\"1917\"\u003eFully Multi-Coated Optics with Crisp Contrast\u003c\/h4\u003e\n\u003cp data-start=\"1919\" data-end=\"2220\"\u003eAll air-to-glass surfaces are \u003cstrong data-start=\"1949\" data-end=\"1971\"\u003efully multi-coated\u003c\/strong\u003e, helping deliver high light transmission and minimizing internal reflections. You’ll get bright, contrast-rich images with crisp star points and low scatter—ideal for deep sky, open clusters, and even lunar observing when paired with a good filter.\u003c\/p\u003e\n\u003cp data-start=\"2222\" data-end=\"2504\"\u003eWhile optimized for visual performance in f\/7 and slower scopes, it still performs admirably in faster instruments, with strong center sharpness and good off-axis correction. The field curvature and edge softness typical in wider 2\" eyepieces are kept in check nicely for the class.\u003c\/p\u003e\n\u003ch4 data-start=\"2506\" data-end=\"2554\"\u003eSturdy Construction, Comfortable Eye Relief\u003c\/h4\u003e\n\u003cp data-start=\"2556\" data-end=\"2849\"\u003eThe eyepiece body is all metal with a textured rubber grip, giving it a high-quality feel that’s also practical in cold or damp observing conditions. It features a \u003cstrong data-start=\"2720\" data-end=\"2748\"\u003etwist-up rubber eyeguard\u003c\/strong\u003e for adjustable comfort, especially helpful when transitioning between eyeglasses and direct viewing.\u003c\/p\u003e\n\u003cp data-start=\"2851\" data-end=\"2987\"\u003eWith \u003cstrong data-start=\"2856\" data-end=\"2878\"\u003e22mm of eye relief\u003c\/strong\u003e, this eyepiece remains comfortable even during extended sessions, and it’s friendly for most eyeglass users.\u003c\/p\u003e\n\u003ch4 data-start=\"2989\" data-end=\"3030\"\u003eBuilt for 2\" Focusers—No Compromises\u003c\/h4\u003e\n\u003cp data-start=\"3032\" data-end=\"3332\"\u003eThis is a true 2\" eyepiece, so you’ll need a 2\" diagonal or focuser to use it. But with that comes the benefit of a significantly wider \u003cstrong data-start=\"3168\" data-end=\"3190\"\u003etrue field of view\u003c\/strong\u003e compared to 1.25\" eyepieces of similar focal length. It’s an excellent match for Dobsonians, large refractors, and SCTs with 2\" visual backs.\u003c\/p\u003e\n\u003cp data-start=\"3334\" data-end=\"3480\"\u003eIt’s also threaded for 2\" filters, so you can pair it with your favorite narrowband or broadband filters to enhance nebulae and dark-sky contrast.\u003c\/p\u003e\n\u003cul data-start=\"3506\" data-end=\"3763\"\u003e\u003c\/ul\u003e\n\u003ch4 data-start=\"3765\" data-end=\"3818\"\u003eExcellent Value in a True Wide-Field 2\" Eyepiece\u003c\/h4\u003e\n\u003cp data-start=\"3820\" data-end=\"4149\"\u003eFor visual astronomers who want expansive, low-power views in a rugged, reliable package, the Explore Scientific 32mm 62° 2\" eyepiece delivers. Whether you’re using it as your primary deep-sky viewer or as a complement to a wider set, it offers premium features—like waterproofing and long eye relief—without a premium price tag.\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e22.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e62°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField Stop\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e33.6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e32mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e14.8 ozs\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","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":40481981857865,"sku":"ES6232","price":119.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/20561.jpg?v=1675379429"},{"product_id":"explore-scientific-40mm-52-series-waterproof-eyepiece","title":"Explore Scientific 40mm 52° Series Waterproof Eyepiece","description":"\u003ch3 data-end=\"246\" data-start=\"150\"\u003eExplore Scientific 40mm 52° Eyepiece – Ultra-Comfortable Viewing with Exceptional Contrast\u003c\/h3\u003e\n\u003cp data-end=\"624\" data-start=\"248\"\u003eIf you’re looking for an eyepiece that delivers generous eye relief, pinpoint sharpness, and immersive views of deep space objects, the \u003cstrong data-end=\"431\" data-start=\"384\"\u003eExplore Scientific 40mm 52° Series Eyepiece\u003c\/strong\u003e is a fantastic choice. Designed for comfort and performance, this long focal length eyepiece is perfect for wide-field observations, especially with telescopes that have longer focal ratios.\u003c\/p\u003e\n\u003ch4 data-end=\"669\" data-start=\"626\"\u003eExpansive 52° Apparent Field of View\u003c\/h4\u003e\n\u003cp data-end=\"1034\" data-start=\"670\"\u003eWith a 52-degree apparent field of view, this eyepiece offers a well-balanced combination of immersive spacewalk-like views and practical usability. Unlike ultra-wide designs that may require head positioning adjustments, the 40mm 52° provides a naturally framed experience, making it an excellent option for scanning star fields, nebulae, and globular clusters.\u003c\/p\u003e\n\u003ch4 data-end=\"1102\" data-start=\"1036\"\u003eLong 40mm Focal Length for Low Power and Maximum Exit Pupil\u003c\/h4\u003e\n\u003cp data-end=\"1481\" data-start=\"1103\"\u003eA 40mm focal length eyepiece is ideal for achieving low magnifications, making it perfect for maximizing the field of view in SCTs, Maksutovs, and refractors. Whether you’re observing the Andromeda Galaxy in its full glory or sweeping across the Milky Way for open clusters, this eyepiece enhances visibility by offering a bright, detailed image with an expansive perspective.\u003c\/p\u003e\n\u003ch4 data-end=\"1560\" data-start=\"1483\"\u003eFully Multi-Coated Optics for Enhanced Contrast and Light Transmission\u003c\/h4\u003e\n\u003cp data-end=\"1939\" data-start=\"1561\"\u003eThe \u003cstrong data-end=\"1612\" data-start=\"1565\"\u003eExplore Scientific 40mm 52° Series Eyepiece\u003c\/strong\u003e features fully multi-coated optics, reducing reflections and improving overall light transmission. This means crisper details, darker backgrounds, and better contrast when observing faint deep-sky objects like nebulae and galaxies. Even subtle planetary details become more defined, providing an enhanced viewing experience.\u003c\/p\u003e\n\u003ch4 data-end=\"2001\" data-start=\"1941\"\u003eGenerous 28mm Eye Relief – Ideal for Eyeglass Wearers\u003c\/h4\u003e\n\u003cp data-end=\"2313\" data-start=\"2002\"\u003eWith an impressive 28mm of eye relief, this eyepiece is a dream for those who wear glasses. It allows for a full field of view without having to press your eye uncomfortably close to the lens. Whether you prefer to observe with or without glasses, the 40mm 52° ensures a relaxed, fatigue-free viewing session.\u003c\/p\u003e\n\u003ch4 data-end=\"2374\" data-start=\"2315\"\u003eWaterproof and Argon-Purged for Long-Term Durability\u003c\/h4\u003e\n\u003cp data-end=\"2679\" data-start=\"2375\"\u003eLike all \u003cstrong data-end=\"2406\" data-start=\"2384\"\u003eExplore Scientific\u003c\/strong\u003e eyepieces, this model is \u003cstrong data-end=\"2463\" data-start=\"2432\"\u003ewaterproof and argon-purged\u003c\/strong\u003e, making it resistant to internal fogging and protecting the internal optics from moisture or contaminants. Whether you observe in humid conditions or varying temperatures, this eyepiece maintains pristine clarity.\u003c\/p\u003e\n\u003ch4 data-end=\"2734\" data-start=\"2681\"\u003e2-Inch Barrel Size for Maximum Light Gathering\u003c\/h4\u003e\n\u003cp data-end=\"3067\" data-start=\"2735\"\u003eDesigned with a standard 2-inch barrel, the 40mm 52° takes full advantage of your telescope’s light-gathering capabilities. The 2-inch format allows for a wider true field of view compared to 1.25-inch eyepieces, making it ideal for deep-sky observations. It also ensures compatibility with a wide range of diagonals and focusers.\u003c\/p\u003e\n\u003ch3 data-end=\"3138\" data-start=\"3069\"\u003eIdeal Applications for the Explore Scientific 40mm 52° Eyepiece\u003c\/h3\u003e\n\u003cul data-end=\"3765\" data-start=\"3139\"\u003e\n\u003cli data-end=\"3300\" data-start=\"3139\"\u003e\n\u003cstrong data-end=\"3164\" data-start=\"3141\"\u003eDeep-Sky Observing:\u003c\/strong\u003e Enjoy stunning wide-field views of large deep-space objects such as the Veil Nebula, Andromeda Galaxy, and the Pleiades star cluster.\u003c\/li\u003e\n\u003cli data-end=\"3433\" data-start=\"3301\"\u003e\n\u003cstrong data-end=\"3331\" data-start=\"3303\"\u003eStar-Hopping Navigation:\u003c\/strong\u003e Easily locate celestial objects and scan rich star fields with its low power and broad perspective.\u003c\/li\u003e\n\u003cli data-end=\"3608\" data-start=\"3434\"\u003e\n\u003cstrong data-end=\"3468\" data-start=\"3436\"\u003eLunar and Planetary Viewing:\u003c\/strong\u003e While primarily designed for deep-sky use, this eyepiece offers beautiful, full-disk views of the Moon and large-scale planetary details.\u003c\/li\u003e\n\u003cli data-end=\"3765\" data-start=\"3609\"\u003e\n\u003cstrong data-end=\"3639\" data-start=\"3611\"\u003eTelescope Compatibility:\u003c\/strong\u003e A perfect match for Schmidt-Cassegrains, Dobsonians, refractors, and Maksutovs, especially those with longer focal lengths.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-end=\"3825\" data-start=\"3767\"\u003eWhy Choose the Explore Scientific 40mm 52° Eyepiece?\u003c\/h3\u003e\n\u003cul data-end=\"4121\" data-start=\"3826\"\u003e\n\u003cli data-end=\"3897\" data-start=\"3826\"\u003e\n\u003cstrong data-end=\"3864\" data-start=\"3828\"\u003eOutstanding clarity and contrast\u003c\/strong\u003e with fully multi-coated optics\u003c\/li\u003e\n\u003cli data-end=\"3975\" data-start=\"3898\"\u003e\n\u003cstrong data-end=\"3919\" data-start=\"3900\"\u003eRelaxed viewing\u003c\/strong\u003e thanks to 28mm eye relief, great for eyeglass wearers\u003c\/li\u003e\n\u003cli data-end=\"4047\" data-start=\"3976\"\u003e\n\u003cstrong data-end=\"4012\" data-start=\"3978\"\u003eWaterproof and nitrogen-purged\u003c\/strong\u003e for durability in all conditions\u003c\/li\u003e\n\u003cli data-end=\"4121\" data-start=\"4048\"\u003e\n\u003cstrong data-end=\"4087\" data-start=\"4050\"\u003eLow-power, wide-field performance\u003c\/strong\u003e for breathtaking deep-sky views\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"4472\" data-start=\"4123\"\u003eIf you’re looking for a well-crafted, optically superior eyepiece that delivers expansive, sharp, and contrast-rich views, the \u003cstrong data-end=\"4290\" data-start=\"4250\"\u003eExplore Scientific 40mm 52° Eyepiece\u003c\/strong\u003e is an excellent investment. Perfect for both seasoned astronomers and beginners, this eyepiece will enhance your viewing experience and bring the wonders of the night sky to life.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eItem Number\u003c\/td\u003e\n\u003ctd\u003eEPWP5240–01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e40mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e96,6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWidth\u003c\/td\u003e\n\u003ctd\u003e61.8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e385.5 grams; 13.6 oz.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\/Type\u003c\/td\u003e\n\u003ctd\u003e2.0\" O.D. \/ Double Taper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e27.1mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e36.3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eEMD (Enhanced Multi-Layer Deposition) on all lens-to-air surfaces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Elements\/ Groups\u003c\/td\u003e\n\u003ctd\u003e4 Elements in 2 Groups; Edge Blackened\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thread\u003c\/td\u003e\n\u003ctd\u003eFits Standard 2.0-inch Dia. Thread in Filters (48mm x 0.75mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eO-Ring Sealed Argon Gas Purged; Tested Under 1 Meter of Water for 30 Minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyecup\u003c\/td\u003e\n\u003ctd\u003eRemovable Flip-Down Style Soft Silicone Rubber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Caps\u003c\/td\u003e\n\u003ctd\u003eSlide-on Top and Bottom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterials\u003c\/td\u003e\n\u003ctd\u003eOptical Glass; Aluminum; Steel; Silicone Rubber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMarkings\u003c\/td\u003e\n\u003ctd\u003eLaser Engraved: Focal Length; Series; Serial Number; Brand\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eTech Details: \u003c\/h2\u003e\n\u003ctable class=\"table\" id=\"product-attribute-specs-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e27.1mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e52°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField Stop\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e36.3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e40mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of optical elements\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e13.6 oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":40481987887177,"sku":"ES5240","price":149.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/epwp5240-01_3_480x480_79d068ba-f62d-45b9-bf95-675f49a4d2f6.jpg?v=1675379820"},{"product_id":"astro-tech-28mm-uwa-82-2-eyepiece","title":"Astro-Tech 28mm UWA 82° 2\" Eyepiece","description":"\u003cp\u003eThe first time you swap out a standard Plossl for the 28mm UWA, the difference hits you immediately. The field opens up from 50° to 82° — nearly three times the area of sky — and objects that were cropped at the edges of a Plossl now sit comfortably inside the view with star field to spare. This is the eyepiece that turns a 10-inch Dob into a deep-sky scanner: drop it in, point at the Milky Way, and start moving. Nebulae, open clusters, and galaxy groups drift through an 82° panorama that's sharp, contrasty, and wide enough to show context. \u003c\/p\u003e\n\u003ch3\u003eThe Sweet Spot\u003c\/h3\u003e\n\u003cp\u003eAn 82° apparent field sits in a practical middle ground. It's wide enough to be immersive — you're inside the star field, not looking at it through a window. But it doesn't require the 9-element optical complexity of a 100° design, which means fewer glass surfaces, higher contrast, and a lighter price. The 28mm UWA uses 7 elements, fully multi-coated — and the light transmission is exceptional: independent measurements on Cloudy Nights show RGB transmission of 94\/96\/98%, with the actual apparent field measuring 83.3° and actual focal length at 28.5mm. The result is a wide-field eyepiece with high contrast and good edge correction that doesn't cost as much as the premium ultra-wides — and doesn't weigh as much either, though at 24 ounces it's still a substantial piece of glass. \u003c\/p\u003e\n\u003ch3\u003eWhere It Shines\u003c\/h3\u003e\n\u003cp\u003eIn a 10-inch f\/5 Dob (1250mm focal length), the 28mm UWA gives you 45x with a 1.8° true field. That's wide enough to frame the entire Orion Nebula complex, both clusters of the Double Cluster simultaneously, or the Pleiades with surrounding star field. In an 8-inch f\/10 SCT, it runs 51x with a 1.6° true field — the low-power, wide-field eyepiece that many SCT owners are missing from their collection. In a short-focal-length refractor like the AT66EDQ at 390mm, it delivers 14x with a 5.8° field — a rich-field sweeper for the Milky Way.\u003c\/p\u003e\n\u003ch3\u003eEye Relief\u003c\/h3\u003e\n\u003cp\u003eEye relief is 12mm. That's comfortable for most observers without glasses but tight for eyeglass wearers. If you observe without glasses, 12mm provides a stable, comfortable eye position. With glasses, you'll lose a portion of the outer field. For observers who need full-field eyeglass compatibility, consider the 20mm XWA (15mm eye relief, 100° field) as an alternative, though at higher magnification and a different price point.\u003c\/p\u003e\n\u003ch3\u003e2\" Barrel Only\u003c\/h3\u003e\n\u003cp\u003eThe 28mm UWA fits 2\" focusers only. The field stop on a 28mm, 82° eyepiece is physically too large for a 1.25\" barrel. A safety groove is machined into the barrel to engage your focuser's thumbscrew.\u003c\/p\u003e\n\u003ch3\u003eWaterproof\u003c\/h3\u003e\n\u003cp\u003eO-ring sealed and waterproof. Prevents internal fogging at cold temperatures, keeps dust out, and protects the internal coatings from humidity over the life of the eyepiece.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAstro-Tech 28mm 82° UWA 2\" eyepiece\u003c\/li\u003e\n\u003cli\u003eLens caps (top and bottom)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e82° apparent field of view\u003c\/strong\u003e — Nearly three times the sky area of a 50° Plossl. Wide enough to be immersive, efficient enough to keep the element count and price reasonable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7-element fully multi-coated optics\u003c\/strong\u003e — Fewer elements than 100° designs means higher contrast. The image is sharp and contrasty across the usable field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e28mm focal length\u003c\/strong\u003e — Low power, wide field. 45x in a 1250mm Dob, 51x in an SCT, 14–25x in short refractors. The finder-replacement eyepiece for deep-sky scanning.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e12mm eye relief\u003c\/strong\u003e — Comfortable without glasses. Tight for eyeglass wearers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWaterproof, O-ring sealed\u003c\/strong\u003e — Cold-weather performance, dust resistance, long-term optical protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2\" barrel with safety groove\u003c\/strong\u003e — Secure connection. The groove engages your focuser thumbscrew.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24 ounces\u003c\/strong\u003e — Substantial. Check balance on lightweight scopes before observing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eUnder the Night Sky\u003c\/h3\u003e\n\u003cp\u003eIn a 10-inch f\/5 Dob at 45x, this is the eyepiece that shows you the neighborhood. The Orion Nebula isn't just M42 — it's M42, the Running Man nebula, the surrounding OB association, and the entire Sword region in one field. The Pleiades show all the bright members plus the fainter outliers, with reflection nebulosity visible on transparent nights. The Double Cluster sits in the center of the field with chains of stars connecting the two clusters, exactly as they look in photographs.\u003c\/p\u003e\n\u003cp\u003ePoint it at the heart of the Virgo Cluster and you can catch three or four galaxies in a single field — M84 and M86 flanking each other, with NGC 4388 nearby. In Sagittarius, the Lagoon and Trifid are close enough to frame together. The Milky Way in Cygnus is a river of resolved stars with dark lanes winding through it. One experienced Cloudy Nights observer using a 16-inch f\/4.4 Dob with a Paracorr turned the 28mm UWA on M81, M82, and NGC 3077 — all three galaxies big and bright in a single field — and described the view as jaw-dropping and totally immersive. That's the kind of experience a wide-field, high-contrast eyepiece delivers in a large Dob: galaxy groups become landscapes, not catalog entries.\u003c\/p\u003e\n\u003cp\u003eFor Dobsonian owners, the low magnification and wide field make this an effective star-hopping eyepiece. The 1.8° true field overlaps well with typical finder fields, so the transition from finder to eyepiece is smooth — what you see in the finder, you see in the eyepiece, just brighter and sharper.\u003c\/p\u003e\n\u003ch3\u003eCommunity Says\u003c\/h3\u003e\n\u003cp\u003e\"The three galaxies (M81, M82, and NGC 3077) big, bright — it doesn't get any better. Jaw dropping, totally immersive, mind blowing.\"\u003cbr\u003e— \u003ca href=\"https:\/\/www.cloudynights.com\/forums\/topic\/810970-astrotech-28mm-uwa\/page\/7\/\"\u003eCloudy Nights AT 28mm UWA discussion\u003c\/a\u003e. This owner was observing with a 16-inch f\/4.4 Dobsonian and Paracorr, and found the 28mm UWA delivered a galaxy group view he described in superlatives.\u003c\/p\u003e\n\u003cp\u003e\"The AT 28mm UWA is one of the very best deals in astronomy today.\"\u003cbr\u003e— \u003ca href=\"https:\/\/www.cloudynights.com\/forums\/topic\/891736-astrotech-82-degree-uwa-eyepieces\/page\/8\/\"\u003eCloudy Nights UWA Eyepieces discussion\u003c\/a\u003e. \u003c\/p\u003e\n\u003ch3\u003eObserving Tip\u003c\/h3\u003e\n\u003cp\u003ePair this eyepiece with a broadband light-pollution filter (UHC or similar) for deep-sky work from suburban skies. At 45x in a 10-inch Dob, the exit pupil is about 5.6mm — large enough that a UHC filter significantly improves the contrast on emission nebulae without dimming the star field excessively. The California Nebula, the Rosette Nebula, and the North America Nebula all become visible targets from Bortle 5–6 skies with this combination.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWill this fit a 1.25\" focuser?\u003c\/strong\u003e\u003cbr\u003eNo. The 28mm UWA is 2\" barrel only. If your scope only accepts 1.25\" eyepieces, look at the 16mm or shorter UWAs in the Astro-Tech line, which fit 1.25\" focusers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does this compare to the 20mm 100° XWA?\u003c\/strong\u003e\u003cbr\u003eDifferent tools for different jobs. The 28mm UWA gives lower magnification and a wider true field (more sky in the view) with an 82° apparent field. The 20mm XWA gives higher magnification and a narrower true field but with a 100° apparent field that feels more immersive. The 28mm is the better deep-sky scanner and star-hopper. The 20mm is the better immersive deep-sky eyepiece for objects that fit within its field.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs 12mm eye relief a problem?\u003c\/strong\u003e\u003cbr\u003eFor observers without glasses, no — 12mm is comfortable for extended sessions. For eyeglass wearers, it's tight. You can still see through the eyepiece with glasses, but you'll lose some of the outer field. If full-field eyeglass use is important, look at the XWA line (15mm eye relief across all focal lengths).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this as a finder replacement?\u003c\/strong\u003e\u003cbr\u003eIn short-focal-length scopes, yes. At 14x in a 390mm refractor or 25x in a 700mm scope, the true field is wide enough (3–6°) to overlap with your finder, making the transition seamless. In longer-focal-length scopes (1250mm+), the true field narrows to 1.8° — still wide, but not a finder replacement.\u003c\/p\u003e\n\u003ch3\u003eFinal Thoughts\u003c\/h3\u003e\n\u003cp\u003eThe 28mm UWA has earned its five-star reviews for a straightforward reason: it delivers wide-field, high-contrast views of deep-sky objects at a price that doesn't require justification. People have described it as the eyepiece they reach for first every session. On Cloudy Nights this eyepiece has generated a 33-page discussion thread. At 82°, the field is wide enough to change how you observe — you stop looking at objects through a tube and start scanning the sky. If you own a telescope with a 2\" focuser and you don't have a wide-field, low-power eyepiece, this is where to start.\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%;\"\u003eFocal Length\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e28mm\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%;\"\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e82°\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%;\"\u003eOptical Elements\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e7 elements, fully multi-coated\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%;\"\u003eEye Relief\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e12mm\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%;\"\u003eBarrel Size\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e2\" only\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%;\"\u003eWaterproof\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eYes — O-ring sealed\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;\"\u003e24 oz\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":40481994047561,"sku":"ATUWA28","price":239.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/hart0026.jpg?v=1675380204"},{"product_id":"astro-tech-4-8mm-100-field-waterproof-1-25-2-eyepiece","title":"Astro-Tech 4.8mm 110° Field Waterproof 1.25\"\/2\" Eyepiece","description":"\u003cp\u003eThe 4.8mm XWA is the eyepiece you pull out when the atmosphere cooperates and you want to push your scope to its limits. In a 12-inch f\/5 Dobsonian, it delivers 313x — deep into high-power territory where Jupiter's cloud bands show festoons, turbulence, and the swirling oval of the Great Red Spot. In a 10-inch, it runs 260x. In a 4-inch f\/7 refractor, 149x. And the 110° apparent field — the widest in the XWA line — means you're not squinting through a pinhole to see it. You're looking through a porthole. One owner put it simply: \"I have never had such a huge crisp high mag view like this before.\"\u003c\/p\u003e\n\u003ch3\u003e110° — The Widest in the Line\u003c\/h3\u003e\n\u003cp\u003eThe 4.8mm and the 3.5mm are the two widest-field eyepieces in the Astro-Tech XWA series. While the 7mm, 9mm, 13mm, and 20mm deliver 100° apparent fields, the 4.8mm and 3.5mm push to 110°. That extra 10° matters at high magnification. The true field is already narrow at 260x+ — the wider apparent field gives you more sky in the eyepiece and more time before the object drifts out of view on an untracked Dobsonian. It's the difference between 30 seconds and 45 seconds of drift time on a planet, and at high power, that difference changes the experience.\u003c\/p\u003e\n\u003ch3\u003eThe Optics\u003c\/h3\u003e\n\u003cp\u003eEight elements, fully multi-coated with blackened lens edges. Corrected for telescopes as fast as f\/4. At 4.8mm, you're demanding a lot from any optical design — the exit pupil is tiny, the magnification is extreme, and optical aberrations that are invisible at longer focal lengths become visible. The 4.8mm XWA handles it well. The field is sharp across the center and middle zones, with some softening in the last 10–15% at fast focal ratios. At f\/5 and slower, the correction tightens. The 8-element design keeps contrast high — important when you're trying to detect subtle planetary detail. Cloudy Nights members who have used the 110° XWAs describe them as among the best values in the hyperwide category — the performance gap with premium alternatives narrower than the price gap would suggest.\u003c\/p\u003e\n\u003ch3\u003eEye Relief\u003c\/h3\u003e\n\u003cp\u003eEye relief is 15mm — remarkably generous for a 4.8mm eyepiece. Most eyepieces at this focal length offer 5–10mm of eye relief, which means pressing your eye uncomfortably close to the lens. The 15mm here means comfortable, relaxed viewing even during long planetary observing sessions. Eyeglass wearers can use it, though they'll lose some of the outer 110° field. The soft rolldown eyecup accommodates both use cases.\u003c\/p\u003e\n\u003ch3\u003eDual 1.25\"\/2\" Barrel\u003c\/h3\u003e\n\u003cp\u003eRemovable 2\" collar reveals a 1.25\" barrel underneath. Safety grooves on both barrels engage your focuser's thumbscrew. At 19 ounces — the same weight as the 3.5mm XWA — this is a substantial eyepiece at a short focal length. The weight reflects the 8-element optical design needed to deliver a 110° field with 15mm of eye relief.\u003c\/p\u003e\n\u003ch3\u003eWaterproof\u003c\/h3\u003e\n\u003cp\u003eO-ring sealed and waterproof. Prevents internal fogging during cold-weather planetary sessions, keeps dust out, and protects the internal coatings from humidity and fungus over the life of the eyepiece.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAstro-Tech 4.8mm 110° XWA 1.25\"\/2\" eyepiece\u003c\/li\u003e\n\u003cli\u003eRemovable 2\" collar (installed)\u003c\/li\u003e\n\u003cli\u003eLens caps (top and bottom)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e110° apparent field of view\u003c\/strong\u003e — The widest field in the XWA line (shared with the 3.5mm). At extreme magnification, the extra 10° over the 100° models gives you noticeably more drift time and a more immersive view.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8-element fully multi-coated optics\u003c\/strong\u003e — Blackened lens edges, designed for high contrast at focal ratios down to f\/4. Maintains sharpness where it matters — across the center and middle zones where planetary detail lives.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4.8mm focal length\u003c\/strong\u003e — Extreme high-power. 260x in a 1250mm Dob, 313x in a 1500mm 12-inch, 149x in a 714mm refractor. This is the eyepiece for nights of excellent seeing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e15mm eye relief\u003c\/strong\u003e — Exceptionally generous for a 4.8mm eyepiece. Comfortable for extended planetary sessions. Usable with eyeglasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual 1.25\"\/2\" barrel\u003c\/strong\u003e — Removable 2\" collar. Safety groove on both barrels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWaterproof, O-ring sealed\u003c\/strong\u003e — Cold-weather performance, dust resistance, long-term coating protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e19 ounces\u003c\/strong\u003e — Check balance on lightweight scopes. The weight reflects the complex optical design.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eUnder the Night Sky\u003c\/h3\u003e\n\u003cp\u003eThis is a planetary eyepiece. In a 12-inch Dob at 313x, Jupiter fills enough of the field to show real weather. The equatorial belts show festoons and barges. The Great Red Spot shows its oval shape, its color, and the turbulence wake trailing behind it. On exceptional nights with steady seeing, you start to pick up subtle banding in the temperate zones — detail that simply doesn't exist at lower magnifications.\u003c\/p\u003e\n\u003cp\u003eSaturn at 313x shows the full ring system in detail. Cassini's Division is a clean gap, not a faint line. The crepe ring is visible against the globe. The shadow of the globe on the rings, and the rings' shadow on the globe, are distinct. Titan shows as a tiny disk, not a point. On the best nights, you can detect the slight color difference between the inner and outer ring.\u003c\/p\u003e\n\u003cp\u003eMars at opposition is where 313x really delivers. The dark surface features — Syrtis Major, Mare Erythraeum, Solis Lacus — show clearly. The polar cap is a distinct bright spot with a visible edge. On good nights in larger scopes, subtle surface detail emerges that you'd never catch at lower magnification.\u003c\/p\u003e\n\u003cp\u003eThe Moon at 313x is a landscape. Crater walls show layered terracing. Central peaks cast long shadows along the terminator. Rilles and graben are resolved as thin dark lines. The Alpine Valley shows its floor. You're not looking at the Moon — you're flying over it.\u003c\/p\u003e\n\u003cp\u003eThis eyepiece is not for every night. At 260x+ you need steady seeing — Antoniadi II or better — or the image softens and swims. On those nights, use the 7mm or 9mm XWA instead. But on the nights when the seeing locks in, the 4.8mm XWA shows you what your telescope can really do.\u003c\/p\u003e\n\u003ch3\u003eCommunity Says\u003c\/h3\u003e\n\u003cp\u003e\"I liked the 4.7mm right away — it was one of my first 100° eyepieces.\"\u003cbr\u003e— \u003ca href=\"https:\/\/www.cloudynights.com\/forums\/topic\/804150-astro-tech-100-field-xwa-eyepieces\/\"\u003eCloudy Nights XWA Eyepieces discussion\u003c\/a\u003e. This owner was exploring the XWA line for the first time and found the 110° models immediately compelling at high magnification.\u003c\/p\u003e\n\u003cp\u003eThe 110° XWAs are described on Cloudy Nights as among the best value propositions in the hyperwide category. Users note the performance gap with premium alternatives is much narrower than the price gap — a consistent finding across multiple threads and scopes.\u003c\/p\u003e\n\u003ch3\u003eObserving Tip\u003c\/h3\u003e\n\u003cp\u003eDon't reach for this eyepiece first. Start your planetary session with the 13mm or 9mm XWA to find the target and assess the seeing. If the stars look steady at 140–180x — tight Airy disks with stable diffraction rings — swap to the 4.8mm. If the stars are bloated or shimmering, stay at lower power. The atmosphere sets the ceiling, not the eyepiece. But when the ceiling is high, this is the eyepiece that takes you there.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs this too much magnification for my telescope?\u003c\/strong\u003e\u003cbr\u003eIt depends on aperture and seeing. In a 12-inch scope, 313x is useful on steady nights — that's about 26x per inch, well within the theoretical limit. In a 10-inch, 260x is similarly reasonable. In a 6-inch, 210x is pushing the practical limit and will only work well on the steadiest nights. In a 4-inch refractor at 149x, you're at a comfortable power for planets. The rule of thumb: if the image looks soft or mushy, the seeing won't support this magnification tonight. Switch to a longer focal length.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does this compare to the 3.5mm XWA?\u003c\/strong\u003e\u003cbr\u003eBoth are 110° AFOV, 8 elements, 15mm eye relief, 19 oz. The difference is focal length — the 3.5mm delivers even higher magnification (357x in a 1250mm scope vs. 260x for the 4.8mm). The 4.8mm is the more versatile of the two — it hits very high magnification while still being usable on most steady nights. The 3.5mm is for nights of exceptional seeing in larger apertures. Most observers would choose the 4.8mm first unless they already own a 5mm eyepiece.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this for deep-sky objects?\u003c\/strong\u003e\u003cbr\u003eAt 260x+, deep-sky targets are limited to compact, bright objects — planetary nebulae (M57, NGC 7662, NGC 6826), tight globular cores, and close double stars. Large diffuse nebulae and galaxies are too faint and too large for this magnification. The 7mm, 9mm, 13mm, and 20mm XWAs are better choices for deep-sky.\u003c\/p\u003e\n\u003ch3\u003eFinal Thoughts\u003c\/h3\u003e\n\u003cp\u003eThe 4.8mm XWA is not an everyday eyepiece — it's the eyepiece for the nights when everything comes together. Steady seeing, a well-collimated scope, and this eyepiece deliver the kind of planetary views that remind you why you bought a telescope in the first place. The 110° field means you don't have to choose between magnification and comfort. The 15mm eye relief means you can observe for an hour without fatigue. And when you drop it into a 12-inch Dob on a night of Antoniadi II seeing and watch Jupiter's cloud bands scroll past, you understand why an owner called it \"a must have.\" It is — for the right nights and the right targets.\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%;\"\u003eFocal Length\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e4.8mm\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%;\"\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e110°\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%;\"\u003eOptical Elements\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e8 elements, fully multi-coated\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%;\"\u003eEye Relief\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e15mm\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%;\"\u003eBarrel Size\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e1.25\" and 2\" (removable 2\" collar)\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%;\"\u003eBarrel Finish\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eChrome with safety groove\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%;\"\u003eEyecup\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eSoft rolldown\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%;\"\u003eWaterproof\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eYes — O-ring sealed\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%;\"\u003eFast Scope Compatibility\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eDesigned for f\/4 and above\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e19 oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eWarranty\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40481994080329,"sku":"ATXWA04","price":279.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/hart0042.jpg?v=1675380207"},{"product_id":"astro-tech-7mm-100-field-waterproof-1-25-2-eyepiece","title":"Astro-Tech 7mm 100° Field Waterproof 1.25\"\/2\" Eyepiece","description":"\u003cp\u003eAt 7mm, you're pushing into serious magnification territory. In a 10-inch f\/5 Dobsonian, the 7mm XWA delivers 179x — high enough to resolve fine planetary detail, split close double stars, and show structure in planetary nebulae. In a 4-inch f\/7 refractor, it gives 102x with a 100° apparent field that one owner described as a \"space porthole.\" The magnification is high enough to be useful on planets. The field is wide enough that the planet doesn't sprint out of view while you're trying to study it. That combination — high power with a 100° field — is what makes this eyepiece worth having.\u003c\/p\u003e\n\u003ch3\u003eThe Optics\u003c\/h3\u003e\n\u003cp\u003eEight elements, fully multi-coated with blackened lens edges. The 7mm is widely regarded on Cloudy Nights as the best performer in the XWA line. In a detailed head-to-head test, one CN member compared the 7mm XWA directly against a 7mm Pentax XW and 7mm Nikon NAV-SW — two premium eyepieces — and found all three equal in contrast on deep-sky targets. NGC 2903 showed structural detail readily, NGC 4565 (the Needle Galaxy) revealed a glow opposite the dust lane, and M64's Black Eye was well-contrasted. He wrote that he \"very quickly became a big fan.\" Another Yotpo reviewer compared the 7mm directly to TeleVue Ethos eyepieces and called it \"right up there.\" At f\/5 and slower, the field is sharp to the edge.\u003c\/p\u003e\n\u003ch3\u003eEye Relief\u003c\/h3\u003e\n\u003cp\u003eEye relief is 15mm — the same as the 20mm and 13mm XWAs in this line, and notably generous for a 7mm focal length. Many high-power eyepieces at this focal length squeeze eye relief down to 10mm or less. The 15mm here means comfortable viewing even for extended sessions, and it's workable for eyeglass wearers — you'll lose some of the outer field, but the 100° apparent field is wide enough that you're moving your eye around to explore the edges regardless.\u003c\/p\u003e\n\u003ch3\u003eDual 1.25\"\/2\" Barrel\u003c\/h3\u003e\n\u003cp\u003eThe eyepiece comes with a removable 2\" collar. Take it off for 1.25\" focusers, diagonals, and Barlows. Both barrels have a safety groove machined into the chrome to engage your focuser's thumbscrew. At 17 ounces, the same weight as the 9mm XWA — the shorter focal length offsets the simpler 8-element design versus the 9mm's 9 elements.\u003c\/p\u003e\n\u003ch3\u003eWaterproof\u003c\/h3\u003e\n\u003cp\u003eO-ring sealed and waterproof. No internal fogging at freezing temperatures, no dust or grit working into the optical assembly, no fungus on interior elements over time. The sealed construction means fewer cleanings and a longer optical life.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAstro-Tech 7mm 100° XWA 1.25\"\/2\" eyepiece\u003c\/li\u003e\n\u003cli\u003eRemovable 2\" collar (installed)\u003c\/li\u003e\n\u003cli\u003eLens caps (top and bottom)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e100° apparent field of view\u003c\/strong\u003e — At 179x in a 1250mm Dob, the wide field gives you roughly 45 seconds of drift time on a planet before it exits the view. That's meaningful at high power, where narrow-field eyepieces give you 15–20 seconds at best.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8-element fully multi-coated optics\u003c\/strong\u003e — Blackened lens edges, corrected for f\/4 and above. Owners compare it favorably to the TeleVue Ethos line at the same focal length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7mm focal length\u003c\/strong\u003e — High-power territory. 179x in a 1250mm Dob, 143x in a 1000mm scope, 102x in a 714mm refractor. Sweet spot for planetary detail, close double stars, and planetary nebulae.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e15mm eye relief\u003c\/strong\u003e — Generous for a 7mm eyepiece. Comfortable without glasses, workable with glasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual 1.25\"\/2\" barrel\u003c\/strong\u003e — Removable 2\" collar. Safety groove on both barrels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWaterproof, O-ring sealed\u003c\/strong\u003e — Prevents fogging, dust intrusion, and fungus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e17 ounces\u003c\/strong\u003e — Same weight as the 9mm XWA. Check balance on lightweight scopes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eUnder the Night Sky\u003c\/h3\u003e\n\u003cp\u003eIn a 10-inch f\/5 Dob at 179x, Jupiter shows the equatorial belts with visible detail — festoons, barges, the Great Red Spot with its surrounding turbulence on good nights. The Galilean moons show as tiny disks. Saturn's Cassini Division is a clean dark gap, and the crepe ring becomes visible against the globe on transparent nights. Mars at opposition shows the dark surface markings and the polar cap.\u003c\/p\u003e\n\u003cp\u003eThis is also prime double-star territory. Albireo is split with room between the components, the gold and blue colors vivid. Epsilon Lyrae — the Double Double — splits cleanly into four stars in steady seeing. Gamma Andromedae shows its color contrast. And with 100° of field, you have time to study the colors and separations without constantly re-centering.\u003c\/p\u003e\n\u003cp\u003ePlanetary nebulae come alive at 179x. M57, the Ring Nebula, is large enough to show its oval shape and central hole clearly, with hints of color in larger scopes. NGC 7662, the Blue Snowball, shows its disk and blue-green tint. M27, the Dumbbell, shows structural detail in the brighter lobes and the fainter wings extending beyond.\u003c\/p\u003e\n\u003cp\u003eGlobular clusters are deeply resolved. M13 at this power breaks into hundreds of individual stars across the face, with chains and lanes visible. M5 shows its elongated shape and resolves well into the core. The view is detailed enough that you start noticing differences in star color within the cluster.\u003c\/p\u003e\n\u003ch3\u003eCommunity Says\u003c\/h3\u003e\n\u003cp\u003e\"I very quickly became a big fan.\" This owner tested the 7mm XWA head-to-head against a 7mm Pentax XW and 7mm Nikon NAV-SW and found all three equal in contrast on deep-sky targets. NGC 2903 showed structural detail readily, NGC 4565 revealed a glow opposite the dust lane, and M64's Black Eye was well-contrasted. He found the XWA more comfortable to use than an 8mm Ethos. — \u003ca href=\"https:\/\/www.cloudynights.com\/forums\/topic\/913601-astro-tech-xwa-7mm-feedback\/\"\u003eCloudy Nights AT XWA 7mm feedback\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eObserving Tip\u003c\/h3\u003e\n\u003cp\u003eIf you observe with both the 7mm XWA and a lower-power XWA like the 13mm, try them on the same target back to back. Start with the 13mm to frame the object and find it in context, then swap to the 7mm to zoom in on detail. The XWA line is close to parfocal, so you'll need only a small focus adjustment between eyepieces. This two-eyepiece approach is faster than using a single eyepiece with a Barlow, and the optical quality stays at its best.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs 179x too much for my scope?\u003c\/strong\u003e\u003cbr\u003eIt depends on your aperture and your sky conditions. A 10-inch scope can handle 179x on most nights with reasonable seeing. A 6-inch scope is being pushed — you'll get sharp views on steady nights, but the image will soften on nights with poor seeing. For a 4-inch refractor, 102x (which is what the 7mm delivers in a 714mm scope) is a comfortable, everyday magnification. The rule of thumb is roughly 25–50x per inch of aperture, depending on seeing conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this with a Barlow?\u003c\/strong\u003e\u003cbr\u003eYes — a 2x Barlow turns it into a 3.5mm eyepiece with 100° field, delivering extreme magnification (358x in a 1250mm Dob). That's useful only on nights of excellent seeing with scopes of 10 inches or more, but when the atmosphere cooperates, the view is remarkable.\u003c\/p\u003e\n\u003ch3\u003eFinal Thoughts\u003c\/h3\u003e\n\u003cp\u003eThe 7mm XWA sits at the intersection of high power and wide field — the magnification you need for planets and fine detail, wrapped in a 100° view that gives you time to observe instead of chase. With 15mm of eye relief it's comfortable at a focal length where many competing eyepieces are not, and at 8 elements it holds contrast and sharpness in a way that has owners comparing it to eyepieces at double the price. If you're building an eyepiece set for a Dob or a medium-focal-length refractor, the 7mm is the high-power anchor — the eyepiece you reach for when the seeing steadies and the detail comes 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%;\"\u003eFocal Length\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e7mm\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%;\"\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e100°\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%;\"\u003eOptical Elements\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e8 elements, fully multi-coated\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%;\"\u003eEye Relief\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e15mm\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%;\"\u003eBarrel Size\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e1.25\" and 2\" (removable 2\" collar)\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%;\"\u003eBarrel Finish\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eChrome with safety groove\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%;\"\u003eEyecup\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eSoft rolldown\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%;\"\u003eWaterproof\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eYes — O-ring sealed\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%;\"\u003eFast Scope Compatibility\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eDesigned for f\/4 and above\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e17 oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eWarranty\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40481994113097,"sku":"ATXWA07","price":279.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/hart0039.jpg?v=1675380209"},{"product_id":"astro-tech-9mm-100-field-waterproof-1-25-2-eyepiece","title":"Astro-Tech 9mm 100° Field Waterproof 1.25\"\/2\" Eyepiece","description":"\u003cp\u003eNine millimeters is where the view starts to get serious. In a 10-inch f\/5 Dobsonian, it gives you 139x — enough to split tight double stars, pull detail out of planetary nebulae, and show Jupiter's cloud belts with real structure. In an f\/7 refractor, it runs 79x with a half-degree true field: tight enough for planets, wide enough for compact clusters. The challenge at this magnification is usually the eyepiece — most high-power eyepieces give you a narrow apparent field, so you're constantly bumping the Dob to keep the target in view. The 9mm XWA solves that with 100° of apparent field. Objects drift through slowly. You observe instead of chase.\u003c\/p\u003e\n\u003ch3\u003eThe Optics\u003c\/h3\u003e\n\u003cp\u003eNine elements, fully multi-coated with blackened lens edges. The design is corrected for telescopes as fast as f\/4 — one Yotpo reviewer reports sharp, high-contrast views to the edge of the field in an f\/4.9 Dobsonian. On Cloudy Nights, a detailed observing report from a 10-inch f\/4.7 Dob user (same optical design, branded Sky Rover) describes the 9mm as delivering sharp images, excellent contrast, and saturated color rendition on everything from Venus to the Orion Nebula — calling M42 \"simply stunning\" and the Moon \"my best ever view\" through the eyepiece's 100° field. At f\/5 and slower, the field is sharp essentially to the stop.\u003c\/p\u003e\n\u003ch3\u003eEye Relief\u003c\/h3\u003e\n\u003cp\u003eEye relief is 13mm — shorter than the 20mm and 13mm XWAs in this line, which have 15mm. For observers without glasses, 13mm is comfortable enough for extended sessions. For eyeglass wearers, it's tight. You can still use the eyepiece with glasses, but you'll lose more of the outer field than you would with the longer-focal-length XWAs. The soft rolldown eyecup helps — fold it down to get your glasses closer to the eye lens.\u003c\/p\u003e\n\u003ch3\u003eDual 1.25\"\/2\" Barrel\u003c\/h3\u003e\n\u003cp\u003eThe eyepiece comes with a removable 2\" collar. Take it off and you have a 1.25\" barrel for smaller focusers, diagonals, and Barlows. Both barrels have a safety groove machined into the chrome to engage your focuser's thumbscrew. At 17 ounces, the eyepiece is lighter than the 20mm and 13mm XWAs — the shorter focal length means a smaller optical assembly — but it's still heavier than a typical Plossl or orthoscopic at this focal length.\u003c\/p\u003e\n\u003ch3\u003eWaterproof\u003c\/h3\u003e\n\u003cp\u003eO-ring sealed and waterproof. No internal fogging at freezing temperatures, no dust intrusion, no fungus on the interior elements. The sealed construction also makes exterior cleaning simpler — no risk of cleaning solution seeping past the lens edge into the interior.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAstro-Tech 9mm 100° XWA 1.25\"\/2\" eyepiece\u003c\/li\u003e\n\u003cli\u003eRemovable 2\" collar (installed)\u003c\/li\u003e\n\u003cli\u003eLens caps (top and bottom)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e100° apparent field of view\u003c\/strong\u003e — At high magnification, the wide field is a practical advantage, not just a luxury. Objects stay in view longer on untracked telescopes, and you see the target in context rather than isolated in a narrow tunnel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9-element fully multi-coated optics\u003c\/strong\u003e — Blackened lens edges, designed for edge sharpness and high contrast at focal ratios down to f\/4. Performs cleanly in fast Dobsonians.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9mm focal length\u003c\/strong\u003e — High-power territory. 139x in a 1250mm Dob, 111x in a 1000mm scope, 79x in a 714mm refractor. Useful for planets, planetary nebulae, globular cluster detail, double stars, and lunar close-ups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e13mm eye relief\u003c\/strong\u003e — Comfortable without glasses. Tight but usable with glasses — the rolldown eyecup helps.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual 1.25\"\/2\" barrel\u003c\/strong\u003e — Removable 2\" collar. Safety groove on both barrels engages your focuser thumbscrew.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWaterproof, O-ring sealed\u003c\/strong\u003e — Prevents internal fogging, dust intrusion, and fungus. Extends the life of the optics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e17 ounces\u003c\/strong\u003e — Lighter than the longer-focal-length XWAs in the line, but still a substantial eyepiece.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eUnder the Night Sky\u003c\/h3\u003e\n\u003cp\u003eIn a 10-inch f\/5 Dobsonian at 139x, Jupiter shows the two main equatorial belts with visible festoons and scalloping on good nights. The Great Red Spot shows color and shape when it transits. Saturn's rings are cleanly separated from the globe, Cassini's Division is a dark line on steady nights, and the shadow of the rings on the globe is visible. The 100° field means the planet drifts slowly across the view — you get a solid 45–60 seconds of observing before the planet reaches the edge, compared to maybe 30 seconds in an eyepiece with a 60° field.\u003c\/p\u003e\n\u003cp\u003eTurn the scope to M57, the Ring Nebula, and the ring shape is obvious at this power. The central hole is clearly defined. With a 12-inch or larger scope, you can start to detect the slight color tint. M27, the Dumbbell Nebula, shows its apple-core shape with the fainter outer lobes becoming visible on transparent nights.\u003c\/p\u003e\n\u003cp\u003eGlobular clusters are where 139x really delivers. M13 breaks into individual stars well past the core. M3 shows its denser central condensation surrounded by resolved chains and arcs. In a 12-inch scope, the view is spectacular — hundreds of individual stars across the face of the cluster, with the 100° field holding the entire globular in context with the surrounding star field.\u003c\/p\u003e\n\u003cp\u003eOn the Moon, 139x is a comfortable power for touring the terminator. Craters show central peaks, terraced walls, and shadow detail. The major rilles — Vallis Schroteri, Hadley Rille — are visible on sharp nights. You can spend an entire session working along the terminator without the view feeling cramped.\u003c\/p\u003e\n\u003ch3\u003eCommunity Says\u003c\/h3\u003e\n\u003cp\u003e\"Simply stunning.\" This owner tested the 9mm in a 10-inch f\/4.7 Dobsonian at 133x and reported Venus sharp and bright, Betelgeuse showing saturated orange, and M42 filling the 100° field with nebulosity that he called his best Orion Nebula view. The Moon was \"my best ever view\" through this eyepiece. \u003c\/p\u003e\n\u003ch3\u003eObserving Tip\u003c\/h3\u003e\n\u003cp\u003eThe 9mm XWA makes an excellent Barlow companion. Drop it into a quality 2x Barlow and you effectively have a 4.5mm eyepiece with 100° apparent field — extreme magnification for planetary and lunar detail on nights of exceptional seeing. Use the 1.25\" barrel (collar removed) in a 1.25\" Barlow for the most secure connection. This gives you two high-power focal lengths from one eyepiece.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs 13mm eye relief enough for eyeglasses?\u003c\/strong\u003e\u003cbr\u003eIt's usable but tight. Most eyeglass wearers can see about 85–90% of the field with glasses on and the eyecup rolled down. If full-field eyeglass compatibility is critical, the 13mm or 20mm XWAs have 15mm eye relief and are more comfortable with glasses. If you observe without glasses (correcting astigmatism with the focuser), 13mm is not an issue.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does this compare to the Astro-Tech 9mm 82° UWA?\u003c\/strong\u003e\u003cbr\u003eThe 82° UWA is lighter, less expensive, and has a narrower field. The 100° XWA has more glass (9 elements), a wider field, waterproof sealing, and better edge correction at fast focal ratios. If you observe with a fast Dob and want the widest possible field at high power, the XWA is the better choice. For a lighter, simpler eyepiece at a lower price, the 82° UWA is a solid alternative.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat magnification will I get?\u003c\/strong\u003e\u003cbr\u003eDivide your telescope's focal length by 9. Examples: 1250mm Dob = 139x, 1000mm scope = 111x, 714mm refractor = 79x, 500mm short refractor = 56x. The 100° apparent field gives a true field of roughly 100° ÷ magnification.\u003c\/p\u003e\n\u003ch3\u003eFinal Thoughts\u003c\/h3\u003e\n\u003cp\u003eThe 9mm is the planetary and detail eyepiece in the XWA line. It delivers the magnification you need for Jupiter's cloud bands, Saturn's rings, and globular cluster resolution, wrapped in a 100° field that gives you real time to observe before the object drifts out. At 17 ounces it's lighter than the wider-field XWAs, and the dual barrel fits any focuser or diagonal in your collection. One owner called it a top-shelf performer in a fast Dob — sharp, contrasty, and easy to use. For the observer who wants high-power views without the narrow-field tunnel effect, this is the eyepiece that delivers.\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%;\"\u003eFocal Length\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e9mm\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%;\"\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e100°\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%;\"\u003eOptical Elements\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e9 elements, fully multi-coated\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%;\"\u003eEye Relief\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e13mm\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%;\"\u003eBarrel Size\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e1.25\" and 2\" (removable 2\" collar)\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%;\"\u003eBarrel Finish\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eChrome with safety groove\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%;\"\u003eEyecup\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eSoft rolldown\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%;\"\u003eWaterproof\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eYes — O-ring sealed\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%;\"\u003eFast Scope Compatibility\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eDesigned for f\/4 and above\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e17 oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eWarranty\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40481994145865,"sku":"ATXWA09","price":279.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/hart0033.jpg?v=1675380212"},{"product_id":"astro-tech-13mm-100-field-waterproof-1-25-2-eyepiece","title":"Astro-Tech 13mm 100° Field Waterproof 1.25\"\/2\" Eyepiece","description":"\u003cp\u003eThirteen millimeters is the sweet spot for a lot of telescopes. In a 10-inch f\/5 Dobsonian, it gives you 96x — enough magnification to resolve the stars in globular clusters, split moderate double stars, and darken the sky background behind faint nebulae, while still holding nearly a full degree of true field. In an f\/7 refractor like the AT102EDL, it delivers 55x with a 1.8° field — the Pleiades sit inside the view with room to breathe. The Astro-Tech 13mm 100° XWA puts that kind of range into a single eyepiece, with an apparent field wide enough that you stop noticing where the view ends.\u003c\/p\u003e\n\u003ch3\u003eThe Optics\u003c\/h3\u003e\n\u003cp\u003eNine elements in six groups, fully multi-coated with blackened lens edges. The optical design is corrected for telescopes as fast as f\/4 — astigmatism, field curvature, and lateral color are controlled well enough that the field stays sharp into the outer zones. At f\/5 and slower, the correction is excellent to the edge. On Cloudy Nights, the 13mm XWA (identical optics whether branded AT, APM, or Lunt) is one of the most discussed eyepieces in the line. CN members consistently describe the contrast as excellent, and multiple experienced observers — including those who own TeleVue Ethos eyepieces — report that the performance gap with premium alternatives is much narrower than the price gap. One CN member calls the 13mm his most-used eyepiece in the entire XWA set. One Yotpo reviewer put it directly: the 13mm XWA delivers about 95% of a TeleVue at a third of the price.\u003c\/p\u003e\n\u003ch3\u003eDual 1.25\"\/2\" Barrel\u003c\/h3\u003e\n\u003cp\u003eThe eyepiece comes with a removable 2\" collar. Remove it and you have a 1.25\" barrel for smaller focusers and diagonals. Both barrels have a safety groove machined into the chrome to engage your focuser's thumbscrew — the eyepiece stays put even if the thumbscrew loosens during observing. At 19 ounces, it's a substantial eyepiece, and the safety groove matters.\u003c\/p\u003e\n\u003ch3\u003eEye Relief and Eyeglass Use\u003c\/h3\u003e\n\u003cp\u003eEye relief is 15mm — enough for comfortable viewing without eyeglasses. With glasses, you'll lose some of the outer field, but with a 100° apparent field, you're moving your eye around to explore the edges regardless. The soft rolldown eyecup shields against ambient light and folds flat for eyeglass wearers.\u003c\/p\u003e\n\u003ch3\u003eWaterproof\u003c\/h3\u003e\n\u003cp\u003eO-ring sealed and waterproof. The practical benefits for astronomy: no internal fogging when you bring a cold eyepiece indoors or observe at freezing temperatures, no dust or fine grit working its way into the optical assembly, and the internal coatings stay protected from humidity and fungus over the life of the eyepiece.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAstro-Tech 13mm 100° XWA 1.25\"\/2\" eyepiece\u003c\/li\u003e\n\u003cli\u003eRemovable 2\" collar (installed)\u003c\/li\u003e\n\u003cli\u003eLens caps (top and bottom)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e100° apparent field of view\u003c\/strong\u003e — Nearly 50% more viewing area than an 82° eyepiece at the same focal length. Deep-sky objects sit in context with their surrounding star fields, not cropped at the edges.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9 elements in 6 groups, fully multi-coated\u003c\/strong\u003e — Blackened lens edges reduce internal scatter. Designed for high contrast and edge sharpness at focal ratios down to f\/4.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e13mm focal length\u003c\/strong\u003e — A versatile mid-power focal length. 77x in a 1000mm scope, 96x in a 1250mm Dob, 55x in a 714mm refractor. Useful on everything from nebulae and clusters to planets and the Moon.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e15mm eye relief\u003c\/strong\u003e — Comfortable for extended sessions. Usable with eyeglasses, though some outer-field vignetting may occur.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual 1.25\"\/2\" barrel\u003c\/strong\u003e — Removable 2\" collar lets you use the eyepiece in any focuser or diagonal. Safety groove on both barrels engages the focuser thumbscrew.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWaterproof, O-ring sealed\u003c\/strong\u003e — Prevents internal fogging, resists dust intrusion, protects coatings from humidity and fungus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoft rolldown eyecup\u003c\/strong\u003e — Blocks ambient light. Rolls flat for eyeglass wearers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e19 ounces\u003c\/strong\u003e — Heavier than a standard eyepiece. Check your balance on lightweight scopes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eUnder the Night Sky\u003c\/h3\u003e\n\u003cp\u003eIn a 10-inch f\/5 Dobsonian, the 13mm XWA gives you 96x and just under a degree of true field. That's the magnification range where globular clusters come alive — M13 starts resolving individual stars across its face, not just at the edges. M22 in Sagittarius shows its slightly elongated shape and begins breaking into chains and knots of stars. Omega Centauri, if you can reach it, is a city of stars filling a good portion of the field.\u003c\/p\u003e\n\u003cp\u003ePoint it at the Orion Nebula and the nebulosity pops against a darker sky background than you'd get at lower power. The Trapezium is cleanly split, and the wings of M42 extend well out from center. Move to M1, the Crab Nebula, and the oval glow shows its slightly mottled texture — something that washes out at lower magnification.\u003c\/p\u003e\n\u003cp\u003eOn planets, 96x is a good starting point for Jupiter — the two main equatorial belts are obvious, the Great Red Spot is visible when it transits, and the Galilean moons show as tiny disks rather than points. Saturn's rings are cleanly separated from the globe with Cassini's Division visible on steady nights. This isn't a high-power planetary eyepiece, but the 100° field gives you a long drift time on an untracked Dob before the planet exits the view.\u003c\/p\u003e\n\u003cp\u003eIn a shorter refractor like the AT86EDQ at 500mm, the 13mm runs 38x with a 2.6° field — open clusters like M35, M37, and the Double Cluster are framed beautifully, fully resolved against a dark background with plenty of surrounding star field for context.\u003c\/p\u003e\n\u003ch3\u003eObserving Tip\u003c\/h3\u003e\n\u003cp\u003eThe 13mm XWA pairs exceptionally well with a UHC or O-III nebula filter on Dobsonians. At 96x in a 10-inch, you're at the sweet spot where the filter darkens the background enough to pull faint nebulosity out of the glow, while the magnification is high enough to show structural detail. Try it on the Veil Nebula — Pickering's Triangle and the thin filaments along NGC 6992 become visible in a way that lower-power views can't match.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow does this compare to the Astro-Tech 13mm 82° UWA?\u003c\/strong\u003e\u003cbr\u003eThe 82° UWA is lighter (about 10 oz), less expensive, and has an 82° field. The 100° XWA has a wider field, more glass (9 elements vs. fewer), and is waterproof. If the wider field and sealed construction matter to you, the XWA is the upgrade. If weight and cost are the priority, the 82° UWA is excellent in its own right.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this eyepiece parfocal with other XWAs in the line?\u003c\/strong\u003e\u003cbr\u003eThe XWA eyepieces are close to parfocal with each other, though you may need a small focus adjustment when swapping between focal lengths. They're not guaranteed parfocal with eyepieces from other lines.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this with a Barlow?\u003c\/strong\u003e\u003cbr\u003eYes. A 2x Barlow effectively turns the 13mm into a 6.5mm with 100° apparent field — very high power with a wide view. Use the 1.25\" barrel (collar removed) in a 1.25\" Barlow, or the 2\" barrel in a 2\" Barlow. Be aware that a Barlow adds optical elements and may slightly affect edge performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill 19 ounces cause balance problems?\u003c\/strong\u003e\u003cbr\u003eOn medium and large Dobsonians, no — the scope has enough mass to absorb the weight. On lightweight refractors, small tabletop Dobs, or alt-az mounts near their capacity, the eyepiece may tip the balance. Check before letting go of the tube.\u003c\/p\u003e\n\u003ch3\u003eFinal Thoughts\u003c\/h3\u003e\n\u003cp\u003eThe 13mm XWA occupies the middle of the magnification range in most telescopes — high enough for detail, low enough for context. It resolves globular clusters, shows planetary detail, and frames nebulae against dark backgrounds, all while holding a 100° field that makes tracking on a Dobsonian feel optional. At 19 ounces it's not a featherweight, and at 9 elements it's not optically simple. But it delivers a view that makes you forget about the hardware and focus on the sky, and that's the entire point of an eyepiece. Owners who've compared it to eyepieces at three times the price have come away impressed — and that tells you more than any spec sheet can.\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%;\"\u003eFocal Length\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e13mm\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%;\"\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e100°\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%;\"\u003eOptical Elements\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e9 elements in 6 groups, fully multi-coated\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%;\"\u003eEye Relief\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e15mm\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%;\"\u003eBarrel Size\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e1.25\" and 2\" (removable 2\" collar)\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%;\"\u003eBarrel Finish\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eChrome with safety groove\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%;\"\u003eEyecup\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eSoft rolldown\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%;\"\u003eWaterproof\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eYes — O-ring sealed\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%;\"\u003eFast Scope Compatibility\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eDesigned for f\/4 and above\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e19 oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eWarranty\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40481994178633,"sku":"ATXWA13","price":279.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/hart0028.jpg?v=1675380214"},{"product_id":"astro-tech-20mm-100-field-waterproof-xwa-2-eyepiece","title":"Astro-Tech 20mm 100° Field Waterproof XWA 2\" Eyepiece","description":"\u003cp\u003eDrop this eyepiece into a 12-inch Dobsonian and you'll understand what 100° does to a deep-sky view. The Orion Nebula doesn't just sit in the center of the field — the nebula, the Trapezium, and the surrounding star field all hang in space together, edge to edge, with room to spare. You stop thinking about the eyepiece and start thinking about the object. That's what the Astro-Tech 20mm 100° XWA is designed to do: give you an immersive, walk-around field of view at moderate power, with enough exit pupil to keep the background dark and the nebulosity bright.\u003c\/p\u003e\n\u003ch3\u003eWhere It Works Best\u003c\/h3\u003e\n\u003cp\u003eThe 20mm XWA is a wide-field, moderate-power eyepiece. In a typical f\/5 Newtonian (1250mm focal length), it delivers 63x with a 1.6° true field — wide enough to frame the entire Veil Nebula complex. In an f\/4.5 Dobsonian (1800mm focal length on a 16-incher), it gives 90x and still holds a degree of true field, enough to take in large globular clusters like M13 with the full halo resolved. In a short-focal-length APO refractor — say, the AT86EDQ at 500mm — it runs 25x with a massive 4° true field: useful for scanning the Milky Way or framing large open clusters like the Double Cluster in their full extent.\u003c\/p\u003e\n\u003cp\u003eThe nine-element optical design is corrected for telescopes as fast as f\/4. In an independent Cloudy Nights review, astronomer and author Alan Dyer tested the 20mm XWA head-to-head against a TeleVue 17mm Ethos in an 8-inch f\/6 Newtonian, a 94mm f\/5.5 APO, and a 105mm f\/6 Astro-Physics refractor. His finding: stars remained pinpoint across the central 75% of the field, softening only slightly in the outer 25% — only marginally behind the Ethos. No ghost images, minimal pincushion distortion, and no kidney-bean blackout. At f\/5 and slower, the field is sharp essentially to the edge. The 20mm also weighed in lighter than all competing 20mm 100° eyepieces — a meaningful advantage on Dobsonians where balance matters.\u003c\/p\u003e\n\u003ch3\u003e2\" Barrel Only\u003c\/h3\u003e\n\u003cp\u003eThe 20mm XWA fits 2\" focusers only. There is no 1.25\" adapter option. The field stop diameter on a 20mm, 100° eyepiece is physically larger than a 1.25\" barrel can accommodate — this is why the smaller XWAs (13mm, 9mm, 7mm, 4.8mm) come with a removable 2\" collar for dual-barrel use, but the 20mm cannot. If your scope only accepts 1.25\" eyepieces, this eyepiece won't work. A safety groove is machined into the chrome barrel to engage your focuser's thumbscrew, preventing the eyepiece from falling if the thumbscrew loosens.\u003c\/p\u003e\n\u003ch3\u003eEye Relief and Eyeglass Use\u003c\/h3\u003e\n\u003cp\u003eEye relief is 15mm — enough for comfortable viewing without eyeglasses. With glasses on, you'll lose some of the outer field, but that matters less than it sounds: the 100° apparent field is so wide that you can't take it all in at once anyway. You naturally move your eye around to explore the edges, and the soft rolldown eyecup lets you position comfortably whether you wear glasses or not.\u003c\/p\u003e\n\u003ch3\u003eWaterproof\u003c\/h3\u003e\n\u003cp\u003eThe eyepiece is O-ring sealed and waterproof. The practical benefit for astronomy isn't about rain — it's about preventing internal fogging when you bring a cold eyepiece indoors, and keeping dust and fine grit out of the optical assembly in windy or dusty conditions. It also means the optics stay clean longer, because the sealed barrel keeps contaminants from reaching the interior elements.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAstro-Tech 20mm 100° XWA 2\" eyepiece\u003c\/li\u003e\n\u003cli\u003eLens caps (top and bottom)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e100° apparent field of view\u003c\/strong\u003e — Nearly 50% more area than an 82° eyepiece at the same focal length. The wider field gives you a panoramic, immersive view of deep-sky objects without sacrificing magnification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9-element fully multi-coated optics\u003c\/strong\u003e — Optimized for high contrast and edge correction at focal ratios down to f\/4. Blackened lens edges reduce internal scatter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20mm focal length\u003c\/strong\u003e — A versatile moderate-power, wide-field focal length. Pairs well with Dobsonians (60–100x), refractors (25–50x), and SCTs (100–150x) depending on focal length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e15mm eye relief\u003c\/strong\u003e — Comfortable for extended observing sessions. Usable with eyeglasses, though the outer field may vignette slightly with glasses on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWaterproof, O-ring sealed\u003c\/strong\u003e — Prevents internal fogging at cold temperatures and keeps dust out of the optical assembly. Sealed construction means fewer cleanings over the life of the eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoft rolldown eyecup\u003c\/strong\u003e — Shields against ambient light from nearby security lights or neighbors. Rolls down flat for eyeglass wearers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2\" chrome barrel with safety groove\u003c\/strong\u003e — The safety groove engages your focuser's thumbscrew to prevent the eyepiece from falling if the thumbscrew loosens during observing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24 ounces\u003c\/strong\u003e — This is a substantial eyepiece. It will shift the balance point on lighter scopes — check your balance before letting go of the tube.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eUnder the Night Sky\u003c\/h3\u003e\n\u003cp\u003eThe 20mm XWA is a deep-sky eyepiece, full stop. In a 10-inch f\/5 Dob, it gives you 64x and a 1.6° true field — enough to frame the entire Orion Nebula complex including the Running Man (NGC 1977) in the same view. The Pleiades sit inside a single field with room around the edges. The Double Cluster in Perseus shows both clusters simultaneously, fully resolved, with a dark lane running between them.\u003c\/p\u003e\n\u003cp\u003eStep up to a 12-inch f\/5, and you're at 76x with the same generous true field. M42 shows the wings extending well beyond the Trapezium, with the nebulosity rolling off into the background. Large globular clusters — M13, M22, Omega Centauri from southern latitudes — start resolving individual stars across the face while the full halo stays within the field.\u003c\/p\u003e\n\u003cp\u003eIn a short-focal-length refractor like the AT66EDQ (390mm), the 20mm runs just 20x with a 5° true field — essentially a rich-field scanning eyepiece. In his CN review, Dyer tested it in a 94mm f\/5.5 refractor at 26x, where it delivered a 3.9° true field that he called \"great for sweeping along the Milky Way.\" Point it at the Cygnus Milky Way and pan slowly. The North America Nebula, the Pelican, the Veil — they drift through the field one after another.\u003c\/p\u003e\n\u003cp\u003eWhere the 100° field really earns its keep is on untracked Dobsonians. At 60–80x, objects stay in the field roughly 50% longer than they would in an 82° eyepiece at the same magnification. That's 50% more time observing before you have to nudge the scope. For sketchers and patient observers, that extra dwell time adds up over a session.\u003c\/p\u003e\n\u003ch3\u003eCommunity Says\u003c\/h3\u003e\n\u003cp\u003e\"I can highly recommend the 20mm XWA.\" This reviewer tested the 20mm head-to-head against a TeleVue 17mm Ethos in three telescopes — an 8-inch f\/6 Newtonian, a 94mm f\/5.5 APO, and a 105mm f\/6 Astro-Physics refractor. Stars remained pinpoint across the central 75% of the field, softening only slightly in the outer 25%. No ghost images, minimal pincushion distortion, and no kidney-bean blackout. The 20mm also weighed in lighter than all competing 20mm 100° eyepieces. — \u003ca href=\"https:\/\/www.cloudynights.com\/articles\/astro-gear-today\/reviews\/astro-tech%E2%80%99s-20mm-xwa-an-affordable-extreme-field-eyepiece-r4585\/\"\u003eCloudy Nights Astro Gear Today review\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eThis owner runs both the 28mm 82° UWA and the 20mm XWA and recommends having each for different situations — the 28mm for maximum true field and lowest power, the 20mm for immersive wide-angle views with better contrast against faint nebulosity. — \u003ca href=\"https:\/\/www.cloudynights.com\/forums\/topic\/909706-at-20mm-xwa-as-primary-low-power-piece\/\"\u003eCloudy Nights AT 20mm XWA discussion\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eObserving Tip\u003c\/h3\u003e\n\u003cp\u003eAt 24 ounces, this eyepiece weighs more than some finder scopes. If you're using a lightweight refractor on an alt-az mount — or a tabletop Dob — the scope will try to nose-dive when you drop the 20mm XWA in. Before you let go of the tube, slide the scope slightly back in the saddle or add a counterweight to the rear. On a Dobsonian, check your altitude tension. Once you've balanced for the 20mm, mark the position — you'll be swapping it in and out all night.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWill this fit a 1.25\" focuser?\u003c\/strong\u003e\u003cbr\u003eNo. The 20mm XWA is 2\" barrel only. The field stop is too large to fit inside a 1.25\" barrel. If your scope only accepts 1.25\" eyepieces, look at the shorter-focal-length XWAs (13mm, 9mm, 7mm, 4.8mm), which come with a removable 2\" collar and fit both barrel sizes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does this compare to the Astro-Tech 28mm 82° UWA?\u003c\/strong\u003e\u003cbr\u003eThe 28mm 82° UWA gives a wider true field (longer focal length means lower power and more sky), but the 20mm 100° XWA has a wider apparent field — the view feels more immersive. The 20mm also gives you higher magnification and a smaller exit pupil, which darkens the sky background and improves contrast on nebulae. Experienced CN members who own both recommend having each for different situations: the 28mm for maximum true field and the 20mm for the immersive wide-angle experience with better contrast. They serve different roles in the same eyepiece case.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the eye relief enough for eyeglasses?\u003c\/strong\u003e\u003cbr\u003eAt 15mm, you can use it with glasses, but you'll lose some of the outer field. Since the 100° field is too wide to see all at once anyway — you naturally look around to explore the edges — the vignetting is less of a practical issue than it would be with a narrower eyepiece. Most eyeglass wearers find it comfortable with the eyecup rolled down.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use a filter with this eyepiece?\u003c\/strong\u003e\u003cbr\u003eYes. Standard 2\" filters thread onto the barrel. This is a common pairing — an O-III or UHC filter on the 20mm XWA makes a formidable combination for large emission nebulae like the Veil, the North America, and the Rosette.\u003c\/p\u003e\n\u003ch3\u003eFinal Thoughts\u003c\/h3\u003e\n\u003cp\u003eThe 20mm XWA fills a specific role: it's the wide-field, moderate-power eyepiece you reach for when the target is big, faint, or both. In a Dobsonian, it's the eyepiece that turns the scope into a deep-sky panorama machine — the Veil complex in one field, the Double Cluster in one glance, the Orion Nebula with room to breathe. It's not light, it's not small, and it only fits 2\" focusers. But if you have a scope that can handle it, the 100° field changes how you observe extended objects. You stop chasing the edge of the field and start just looking.\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%;\"\u003eFocal Length\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e20mm\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%;\"\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e100°\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%;\"\u003eOptical Elements\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e9 elements, fully multi-coated\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%;\"\u003eEye Relief\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e15mm\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%;\"\u003eBarrel Size\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e2\" only\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%;\"\u003eBarrel Finish\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eChrome with safety groove\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%;\"\u003eEyecup\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eSoft rolldown\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%;\"\u003eWaterproof\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eYes — O-ring sealed\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%;\"\u003eFast Scope Compatibility\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eDesigned for f\/4 and above\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e24 oz (690g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eWarranty\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e1 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":40481994211401,"sku":"ATXWA20","price":299.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/products\/hart0031.jpg?v=1675380216"},{"product_id":"astro-tech-3-5mm-110-field-waterproof-1-25-2-eyepiece","title":"Astro-Tech 3.5mm 110° Field Waterproof 1.25\"\/2\" Eyepiece","description":"\u003cp\u003eHigh-power planetary eyepieces have a reputation problem: the higher the magnification, the narrower the view, and the faster the planet drifts out of the field. With a standard 50-degree eyepiece at 300×, Jupiter crosses your field of view in seconds. You spend more time nudging the scope than actually observing. The Astro-Tech 3.5mm XWA solves this the direct way — it delivers 110 degrees of apparent field, nearly 50% more viewing area than an 82-degree eyepiece at the same magnification. The planet still moves at the same rate, but you have a much wider window to watch it in. On a Dobsonian without tracking, that's the difference between glimpses and sustained observation.\u003c\/p\u003e\n\u003ch3\u003eThe View at 110°\u003c\/h3\u003e\n\u003cp\u003eOne hundred and ten degrees of apparent field is not like looking through a tube. It's closer to looking through a window. The field edge is in your peripheral vision — you're aware of it, but you're not bumping into it. At 3.5mm in an f\/5 Dobsonian (1,250mm focal length), you're observing at 357× with a true field of roughly 0.31 degrees. In a conventional 50° Plössl at that magnification, the same true field would require constant tracking adjustments. With 110°, Jupiter or Saturn stays centered long enough to study belt detail, follow a moon transit, or wait for a moment of steady seeing.\u003c\/p\u003e\n\u003cp\u003eThe optical design uses 8 elements with full broadband multi-coatings on all air-to-glass surfaces and blackened lens edges to control stray light. The result is good contrast and well-controlled astigmatism, field curvature, and lateral color across the field — important in a design this wide, where off-axis aberrations can compromise the outer third of a lesser eyepiece. This eyepiece is designed to perform in fast telescopes down to f\/4, so it handles the steep light cone of short-tube Newtonians and fast refractors without falling apart at the edges.\u003c\/p\u003e\n\u003ch3\u003eBuilt for the Field\u003c\/h3\u003e\n\u003cp\u003eThe entire eyepiece is O-ring sealed against moisture. That matters for astronomy more than it might sound. Sealed construction prevents internal fogging during cold-weather sessions when temperatures drop rapidly. It keeps dust and fine particulates out of the optics in windy conditions. It blocks fungal growth in humid climates. And it means you can clean the exterior without worrying about solution seeping between elements. Five practical benefits from one engineering decision.\u003c\/p\u003e\n\u003cp\u003eThe barrel is dual-diameter — a 1.25\" barrel with a removable 2\" collar, so it fits either focuser size without an adapter. A safety groove machined into the barrel engages your focuser thumbscrew, preventing the eyepiece from falling out if the thumbscrew loosens during use. At 19 ounces, this eyepiece has real weight to it. That's the tradeoff for 8 elements and 110 degrees of field. On a solid mount it's a non-issue, but on a lightweight tabletop Dob or small refractor, you may need to rebalance.\u003c\/p\u003e\n\u003cp\u003eThe soft rolldown eyecup shields your eye from ambient light — helpful when a neighbor's security light or a fellow observer's headlamp wants to wreck your dark adaptation. Fold it down for eyeglass use.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAstro-Tech 3.5mm 110° waterproof XWA eyepiece\u003c\/li\u003e\n\u003cli\u003eRemovable 2\" barrel collar (1.25\" barrel underneath)\u003c\/li\u003e\n\u003cli\u003eDust caps\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e110° apparent field of view\u003c\/strong\u003e — The widest AFOV in the Astro-Tech lineup. Nearly 50% more viewing area than an 82° eyepiece, and more than four times the area of a 50° Plössl. Planets stay in view dramatically longer on untracked mounts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.5mm focal length for serious high power\u003c\/strong\u003e — Delivers 257× in an f\/6, 343× in an f\/8, 357× in an f\/5, and 571× in an f\/10 SCT. This is the eyepiece for nights when the seeing is rock-steady and you want to push the magnification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8-element fully multi-coated optics\u003c\/strong\u003e — Full broadband multi-coatings on all air-to-glass surfaces keep internal reflections low and contrast high despite the complex multi-element design. Blackened lens edges further suppress scattered light.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eO-ring sealed \/ waterproof\u003c\/strong\u003e — Prevents internal fogging in cold, keeps out dust and moisture, blocks fungal growth in humid climates, and makes cleaning the exterior safe and simple.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e15mm eye relief\u003c\/strong\u003e — Comfortable for extended observing sessions, including use with eyeglasses. Soft rolldown eyecup adjusts for glasses-on or glasses-off viewing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual 1.25\"\/2\" barrel\u003c\/strong\u003e — Removable 2\" collar reveals a 1.25\" barrel underneath. Fits any focuser without adapters. Safety groove engages the thumbscrew so the eyepiece can't fall out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesigned for fast telescopes (f\/4 and above)\u003c\/strong\u003e — Well-controlled astigmatism and field curvature at fast focal ratios. Works with short-tube Newtonians, fast refractors, and Dobsonians without edge-of-field breakdown.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6.7mm field stop\u003c\/strong\u003e — Determines the true field of view in your telescope. Divide 6.7mm by your telescope's focal length (in mm) and multiply by 57.3 to get your true field in degrees.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eObserving Tip\u003c\/h3\u003e\n\u003cp\u003eThe first time you look through a 110° eyepiece, your instinct will be to press your eye tight against the lens to see the whole field. Don't. Hold your eye at the full 15mm of relief, relax, and let the field fill your vision naturally. It takes a session or two to learn the viewing technique — the field edge is in your peripheral vision, not centered. Once you stop trying to \"find\" the edge and let the view come to you, the spaceship-window effect clicks, and you won't want to go back to a narrow field.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is 3.5mm too much magnification for my scope?\u003c\/strong\u003e\u003cbr\u003eIt depends on your focal length and your sky conditions. A useful rule: divide your aperture in millimeters by 0.5 to get the theoretical maximum useful magnification. So a 200mm scope can handle up to 400×. But the atmosphere usually limits you to 200–300× on most nights. The 3.5mm XWA is built for the nights when the seeing cooperates and you want to push the limits. On average nights, it may be more magnification than the atmosphere supports — that's normal. Pair it with a longer XWA for nights when the seeing is less steady.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does 110° compare to an 82° eyepiece at the same focal length?\u003c\/strong\u003e\u003cbr\u003eAt the same focal length, you get the same magnification. The difference is field width. A 110° eyepiece shows nearly 50% more sky area than an 82° eyepiece. In practical terms, a planet drifts through the 110° field roughly a third longer before exiting. That extra time is the whole point — more observing, less nudging.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will it work with eyeglasses?\u003c\/strong\u003e\u003cbr\u003eYes. The 15mm eye relief accommodates most eyeglasses. Fold down the soft rolldown eyecup to bring your eye closer to the lens. You won't see the full 110° with glasses on — expect to lose some edge — but the usable field is still wider than most conventional eyepieces deliver at any focal length.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: The eyepiece weighs 19 ounces — will it tip my scope?\u003c\/strong\u003e\u003cbr\u003eIt might, on a lightweight setup. If you're using a small tabletop Dobsonian or a light refractor on a photo tripod, test the balance before loosening your altitude lock. On a solid equatorial mount or a full-size Dobsonian, 19 ounces won't be an issue. If you're concerned, have a counterweight ready or check the balance before pointing to zenith.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I need the 2\" barrel, or can I use it in a 1.25\" focuser?\u003c\/strong\u003e\u003cbr\u003eBoth. The 2\" collar is removable — unscrew it and you have a standard 1.25\" barrel underneath with a safety groove. If your scope has a 2\" focuser, use the full collar for a secure fit. If it only accepts 1.25\", remove the collar. No adapter needed either way.\u003c\/p\u003e\n\u003ch3\u003eFinal Thoughts\u003c\/h3\u003e\n\u003cp\u003eThe 3.5mm XWA is not for every night or every scope. It's a specialized tool — the eyepiece you reach for when the atmosphere settles down and you want to push serious magnification without losing the target every few seconds. On a good night, with a scope that can feed it enough light and resolution, 110 degrees at high power is unlike anything a conventional eyepiece can deliver. The planet just sits there, suspended in a wide dark field, while you watch the details unfold. Sealed, dual-barrel, built for fast scopes. For the observer who already knows what magnification they need and wants the widest possible view when they get there.\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%;\"\u003eEyepiece Type\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eUltra-wide-angle (XWA)\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;\"\u003e3.5mm\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%;\"\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e110°\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%;\"\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e6.7mm\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%;\"\u003eEye Relief\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e15mm\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%;\"\u003eNumber of Optical Elements\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e8\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 broadband multi-coated (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%;\"\u003eLens Edge Treatment\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eBlackened\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%;\"\u003eBarrel Size\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e1.25\" and 2\" (removable 2\" collar)\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%;\"\u003eSafety Groove\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eYes — machined into barrel for thumbscrew retention\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%;\"\u003eEyecup\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eSoft rolldown\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%;\"\u003eWaterproof\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eYes — O-ring sealed\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%;\"\u003eFast Scope Compatibility\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eDesigned for f\/4 and above\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%;\"\u003eFilter Threaded\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eNo\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;\"\u003e19 oz\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%;\"\u003eApproximate Length\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e~170mm (with 2\" collar)\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%;\"\u003eIncluded\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eEyepiece with 2\" collar, dust caps\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 manufacturer warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Astro-Tech","offers":[{"title":"Default Title","offer_id":41403630714953,"sku":"ATXWA03","price":279.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/image_4b1b9abc-62f3-4b82-9f28-61fca5c61923.jpg?v=1716202015"},{"product_id":"astro-tech-21mm-uwa-82-2-eyepiece","title":"Astro-Tech 21mm UWA 82° 2\" Eyepiece","description":"\u003cp\u003eYou spend half the night swapping eyepieces. A 28mm wide-field for the big nebulae, a 16mm for the tight clusters, and something in between that you never quite found — an eyepiece that gives you a real wide-field view at a magnification high enough to pull detail out of deep sky objects without drowning in exit pupil. The Astro-Tech 21mm UWA 82° was designed to fill that gap.\u003c\/p\u003e\n\u003cp\u003eAt 21mm in an f\/7 refractor, you're working with a 3mm exit pupil — dark enough to boost contrast on faint nebulosity, bright enough that the sky background stays smooth. The 82° apparent field gives you roughly 1.7 degrees of true field at that magnification, which is enough to frame the entire Veil Nebula complex or the full sweep of the Double Cluster with room to spare. In an f\/5 Dobsonian, you're at higher power with a tighter exit pupil, and the eyepiece becomes a serious planetary nebula and globular cluster tool.\u003c\/p\u003e\n\u003cp\u003eThe optical design uses six elements in four groups — low-dispersion glass, high-refractive-index elements, and full multicoatings on every air-to-glass surface. The lens edges are blackened to kill internal reflections. The result is a clean, high-contrast image with excellent color correction across the field. And unlike some 82° designs that compromise sharpness at the edges, the 21mm UWA delivers a remarkably flat field — Cloudy Nights reviewers have called it the sharpest edge-to-edge performer in the AT UWA series.\u003c\/p\u003e\n\u003cp\u003eOne honest note on the eye relief: at 14mm, it's comfortable for most observers without glasses. But if you wear eyeglasses, you won't see the entire 82° field. The fold-down rubber eyecup helps you get close, and the moderate eye placement prevents kidney-beaning and blackouts. Non-glasses wearers generally find it natural and easy — just fold the cup down and look.\u003c\/p\u003e\n\u003cp\u003eThe 21mm weighs 14.1 ounces, which is nearly ten ounces lighter than the 28mm UWA. It's a 2\" barrel eyepiece, built from anodized aluminum with a clean black-and-silver finish. It ships with dust caps for both ends and is parfocal with the rest of the AT UWA 82° series — swap from the 28mm to the 21mm to the 16mm without refocusing.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAstro-Tech 21mm UWA 82° 2\" eyepiece\u003c\/li\u003e\n\u003cli\u003eSoft fold-down rubber eyecup\u003c\/li\u003e\n\u003cli\u003eDust cap — eye end\u003c\/li\u003e\n\u003cli\u003eDust cap — barrel end\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCommunity Says\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\"I was surprised to see the stars in the 21mm were sharp all the way to the field edge in my AT102EDL f\/7 refractor. The view was flat like a 30mm UFF eyepiece, but with a wider AFOV and shorter eye relief.\"\u003c\/strong\u003e\u003cbr\u003e— \u003ca href=\"https:\/\/www.cloudynights.com\/forums\/topic\/968136-astro-tech-21mm-uwa-82-reviews-specs-pics-observation-reports\/?do=findComment\u0026amp;comment=14192928\"\u003eCloudy Nights AT 21mm UWA discussion\u003c\/a\u003e. This owner compared it directly to the 28mm UWA, 16mm UWA, and 24mm ES 68° over an entire night and found the 21mm was the only eyepiece consistently sharp to the field edge.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\"To call the field flat is an understatement. Eye relief is fine for me but many will find it to be rather sparse.\"\u003c\/strong\u003e\u003cbr\u003e— \u003ca href=\"https:\/\/www.cloudynights.com\/forums\/topic\/968136-astro-tech-21mm-uwa-82-reviews-specs-pics-observation-reports\/?do=findComment\u0026amp;comment=14203261\"\u003eCloudy Nights AT 21mm UWA discussion\u003c\/a\u003e. This owner conducted drift tests confirming the manufacturer's 1.7° true field spec and resolved the tight double star Porrima right up to the field stop at 48x in a 1000mm refractor.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\"In better seeing, the 21 UWA and the 20 T5 Nagler felt more similar than different.\"\u003c\/strong\u003e\u003cbr\u003e— \u003ca href=\"https:\/\/www.cloudynights.com\/forums\/topic\/968136-astro-tech-21mm-uwa-82-reviews-specs-pics-observation-reports\/?do=findComment\u0026amp;comment=14490999\"\u003eCloudy Nights AT 21mm UWA discussion\u003c\/a\u003e. This owner tested the 21mm UWA against a Nagler T5 20mm, an Axiom LX 23mm, and a Pentax XW 23mm in a 16\" f\/4.5 Dob with a Paracorr 2, and found only minor astigmatism in the outer 10% of the field — comparable to the Nagler.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e82° apparent field of view.\u003c\/strong\u003e Wide enough that you lose the \"looking down a tube\" feeling of a 50° Plössl, without the weight and cost of a 100° design. The 82° sweet spot gives you a full-immersion view where star patterns match your charts and your eye can relax into averted vision naturally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSix-element, four-group optical design.\u003c\/strong\u003e Low-dispersion and high-refractive-index glass with full multicoatings on all air-to-glass surfaces. Blackened lens edges suppress internal scatter. The result is high contrast and flat-field sharpness from center to edge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3mm exit pupil in an f\/7 scope.\u003c\/strong\u003e The 21mm focal length hits a practical sweet spot for deep sky work in refractors and longer-focal-length Newtonians. High enough magnification to darken the sky background and boost contrast on faint objects, low enough to keep the field bright and the image smooth.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e14.1-ounce weight.\u003c\/strong\u003e Nearly ten ounces lighter than the 28mm UWA. Light enough that it won't throw off the balance on a small refractor or stress a compression ring fitting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParfocal with the AT UWA 82° series.\u003c\/strong\u003e Swap between the 28mm, 21mm, 16mm, 13mm, and 10mm without refocusing. Build a matched set that lets you change magnification without losing your target.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2\" barrel with undercut.\u003c\/strong\u003e Locks securely into any standard 2\" focuser with a compression ring or thumbscrew. The wider barrel eliminates the vignetting you'd get from a 1.25\" barrel at this field of view.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFold-down rubber eyecup.\u003c\/strong\u003e Fold it up for glasses wearers who want to get as close as possible, or fold it down for a natural eye position without glasses. Soft rubber that won't scratch your lenses.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eUnder the Night Sky\u003c\/h3\u003e\n\u003cp\u003eIn an 8\" f\/6 Dobsonian (1200mm focal length), the 21mm UWA puts you at 57x with a 1.4° true field. That's a solid deep sky magnification: the Double Cluster fills the view beautifully with both NGC 869 and NGC 884 resolved into individual stars against a dark background. M13 shows its granular core and the outer chains of stars fanning outward. The Dumbbell Nebula (M27) pops against the sky background with its apple-core shape clearly defined.\u003c\/p\u003e\n\u003cp\u003eMove to a 10\" f\/5 Dob and you're at 63x with a 1.3° field. Now the Orion Nebula (M42) fills the view with the Trapezium cluster sharp at center and the nebulosity streaming outward to the field edges. The Lagoon Nebula (M8) shows its dark lane cutting through the bright emission regions. NGC 7000, the North America Nebula, starts to reveal its shape under dark skies — the 21mm's contrast and wide field are exactly what that object needs.\u003c\/p\u003e\n\u003cp\u003eIn a 4\" f\/7 refractor — the scope the AT UWA series was tested in most extensively on Cloudy Nights — you're at 34x with a 2.4° true field. That's a proper rich-field setup: the Pleiades fit comfortably in the field with the faint reflection nebulosity around the brighter stars visible on a transparent night. Sweep through Cygnus and you'll catch the entire Veil Nebula arc in a single field of view with an OIII filter.\u003c\/p\u003e\n\u003ch3\u003eObserving Tip\u003c\/h3\u003e\n\u003cp\u003eThe 21mm UWA's 3mm exit pupil in an f\/7 refractor is ideal for hunting faint nebulae and planetary nebulae against a darkened sky background. But here's a trick: pair it with an OIII or UHC narrowband filter for emission nebula work. The 82° field means you're scanning less and seeing more in each field of view, and the high contrast of the eyepiece plays well with the filter's narrowband pass. The North America Nebula, the Veil complex, and the Rosette Nebula all benefit enormously from this combination. The 2\" barrel means your filter threads right onto the eyepiece — no adapter needed.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this eyepiece with glasses on?\u003c\/strong\u003e\u003cbr\u003eThe 14mm eye relief is comfortable without glasses, but eyeglass wearers will not see the full 82° field. You'll see most of it — probably 70° or so — but the extreme edges will be vignetted. If full-field viewing with glasses is a priority, consider the 28mm UWA, which has 15mm of eye relief in a slightly more forgiving eye position, or look at the AT UFF series, which offers longer eye relief at the cost of a narrower apparent field.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the 21mm compare to the 28mm UWA?\u003c\/strong\u003e\u003cbr\u003eSame optical family, different jobs. The 28mm is your widest-field, lowest-power eyepiece — maximum true field, maximum exit pupil, the big-sweep view. The 21mm steps up the magnification and darkens the sky background for higher-contrast deep sky views. It's almost ten ounces lighter than the 28mm and produces a flatter field edge-to-edge, likely because the optical design was refined after the rest of the UWA series. Think of the 28mm as your finder-chart view and the 21mm as your \"now let's look closer\" view.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this eyepiece sharp at the edges in fast scopes?\u003c\/strong\u003e\u003cbr\u003eIn f\/7 and slower scopes, the 21mm UWA is exceptionally sharp to the edge — multiple Cloudy Nights reviewers have noted it's the best edge performer in the AT UWA series. In f\/5 to f\/6 scopes, you may see some field curvature or slight softening at the extreme edge, which is normal for an 82° eyepiece at those speeds. In a fast Dob (f\/4 to f\/5), a coma corrector like a Paracorr helps, and users report results comparable to a Nagler T5 in that configuration.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the true field of view in my scope?\u003c\/strong\u003e\u003cbr\u003eDivide your telescope's focal length into 21mm to get the magnification, then divide 82° by that magnification to get an approximate true field. For example: 1000mm focal length → 48x → 1.7° true field. A 1200mm SCT → 57x → 1.4°. A 714mm f\/7 refractor → 34x → 2.4°. The manufacturer's spec has been independently confirmed by drift tests.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this eyepiece parfocal with the other AT UWAs?\u003c\/strong\u003e\u003cbr\u003eYes. It's designed to be parfocal across the AT UWA 82° series (28mm, 21mm, 16mm, 13mm, 10mm, 7mm, 4mm). You can swap eyepieces without refocusing, which keeps your target centered and speeds up your observing.\u003c\/p\u003e\n\u003ch3\u003eAccessories\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAstro-Tech 28mm UWA 82° 2\" Eyepiece:\u003c\/strong\u003e The wide-field companion. Use the 28mm for maximum true field and the 21mm when you need more magnification and contrast. Together they cover the low-to-medium power range in any 2\" focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAstro-Tech 16mm UWA 82° 1.25\" Eyepiece:\u003c\/strong\u003e Step up from the 21mm when you need tighter framing on smaller objects. Parfocal with the 21mm, so you swap without refocusing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCelestron LensPen Optics Cleaning Tool:\u003c\/strong\u003e The best way to clean an eyepiece lens in the field. Retractable brush on one end, carbon cleaning pad on the other.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2\" UHC or OIII Narrowband Filter:\u003c\/strong\u003e Thread onto the 21mm's 2\" barrel for emission nebula work. The wide field and high contrast of the 21mm UWA are ideal partners for narrowband filtering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFinal Thoughts\u003c\/h3\u003e\n\u003cp\u003eThe AT UWA 82° series has been one of the quiet success stories in affordable wide-field eyepieces — solid performers that don't pretend to be Naglers but deliver a lot more than their price would suggest. The 21mm is the newest addition to the line, and it may be the best one yet. The flat-field performance that Cloudy Nights reviewers keep pointing to — sharp stars to the edge in an f\/7 refractor, competitive with a Nagler T5 in a fast Dob — suggests the optical design genuinely improved between the original series and this release. If you're building an AT UWA set for deep sky work, this is the eyepiece that fills the gap between the 28mm's big-sweep view and the 16mm's tighter framing. If you just want one wide-field 2\" eyepiece that balances magnification, contrast, true field, and weight, the 21mm is a very strong place to start.\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%;\"\u003eFocal Length\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e21mm\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%;\"\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e82°\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%;\"\u003eBarrel Size\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e2\" (50.8mm)\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%;\"\u003eEye Relief\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e14mm\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%;\"\u003eOptical Design\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e6 elements in 4 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eCoatings\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eFully multicoated (all air-to-glass surfaces)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f0f4f8;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc; font-weight: bold; width: 50%;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003e14.1 oz (~400g)\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%;\"\u003eEyecup\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eSoft fold-down rubber\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%;\"\u003eWaterproof\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eYes — nitrogen-purged, O-ring sealed\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%;\"\u003eParfocal\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eYes — within the AT UWA 82° series\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%;\"\u003eConstruction\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #cccccc;\"\u003eAnodized aluminum, blackened lens edges\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":41515796922441,"sku":"ATUWA21","price":191.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/21mmUWA82_Eyepiece1-9702.jpg?v=1731952281"},{"product_id":"celestron-omni-56mm-2-plossl","title":"Celestron Omni 56mm 2\" Plossl  93328","description":"\u003cp data-start=\"166\" data-end=\"264\" class=\"\"\u003e\u003cstrong data-start=\"166\" data-end=\"264\"\u003eCelestron Omni 56mm 2\" Plössl Eyepiece – A Wide-Field Low Power Giant for Deep Sky Exploration\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"266\" data-end=\"705\" class=\"\"\u003eThe Celestron Omni 56mm 2\" Plössl eyepiece is designed to deliver expansive low-power views, making it an excellent choice for deep-sky observing and framing large celestial objects like the Andromeda Galaxy, the Pleiades, or wide swaths of the Milky Way. With its ultra-long 56mm focal length and standard 2\" barrel, this eyepiece is all about maximizing true field of view—perfect for sweeping the heavens with large-aperture telescopes.\u003c\/p\u003e\n\u003cp data-start=\"707\" data-end=\"1150\" class=\"\"\u003eWhile shorter focal length Plössls excel in planetary and lunar detail, long focal length Plössls like the 56mm Omni serve a different purpose: giving observers the largest possible field of view for visual observing or as a finder eyepiece. It's a favorite among visual astronomers who want to fully experience the scale and grandeur of the night sky, especially when used with slower focal ratio scopes like Schmidt-Cassegrains or Maksutovs.\u003c\/p\u003e\n\u003ch3 data-start=\"1152\" data-end=\"1173\" class=\"\"\u003eOptics and Design\u003c\/h3\u003e\n\u003cp data-start=\"1175\" data-end=\"1522\" class=\"\"\u003eThe Celestron Omni 56mm Plössl uses a classic four-element symmetrical design, known for delivering crisp, flat-field images with minimal distortion across most of the field. The optics are fully multicoated to enhance light transmission and contrast, helping faint nebulae and galaxies stand out more clearly against the dark background of space.\u003c\/p\u003e\n\u003cp data-start=\"1524\" data-end=\"1950\" class=\"\"\u003eThe 56mm focal length provides a huge exit pupil when paired with telescopes of f\/10 or slower, making it well-suited to maximizing brightness in deep-sky objects. However, in faster scopes, the exit pupil can become excessively large, potentially leading to some light loss as your eye’s pupil can’t capture all the delivered light. This eyepiece performs best in scopes around f\/10 to f\/15, such as Celestron’s popular SCTs.\u003c\/p\u003e\n\u003ch3 data-start=\"1952\" data-end=\"1969\" class=\"\"\u003eBuild Quality\u003c\/h3\u003e\n\u003cp data-start=\"1971\" data-end=\"2379\" class=\"\"\u003eCelestron’s Omni eyepieces are built with durability and usability in mind. The 2\" barrel is threaded for standard 2\" filters, allowing you to easily attach light pollution or nebula filters for enhanced performance. The barrel is precision-machined and blackened internally to reduce reflections and stray light. A rubber grip ring around the body makes it easier to handle in the dark, even with gloves on.\u003c\/p\u003e\n\u003cp data-start=\"2381\" data-end=\"2695\" class=\"\"\u003eThe eye lens on the 56mm is large and easy to view through, and the eyepiece offers very generous eye relief—ideal for eyeglass wearers or those who prefer a more relaxed viewing experience. While the apparent field of view is a modest 47°, the true field—thanks to the long focal length—remains impressively wide.\u003c\/p\u003e\n\u003ch3 data-start=\"2697\" data-end=\"2715\" class=\"\"\u003eWho Is It For?\u003c\/h3\u003e\n\u003cp data-start=\"2717\" data-end=\"2750\" class=\"\"\u003eThis eyepiece is best suited for:\u003c\/p\u003e\n\u003cul data-start=\"2752\" data-end=\"3103\"\u003e\n\u003cli data-start=\"2752\" data-end=\"2829\" class=\"\"\u003e\n\u003cp data-start=\"2754\" data-end=\"2829\" class=\"\"\u003eDeep-sky observers who want to view large objects or scan rich star fields.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2830\" data-end=\"2913\" class=\"\"\u003e\n\u003cp data-start=\"2832\" data-end=\"2913\" class=\"\"\u003eSCT or Maksutov owners looking to wring every bit of true field from their scope.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2914\" data-end=\"3024\" class=\"\"\u003e\n\u003cp data-start=\"2916\" data-end=\"3024\" class=\"\"\u003eAstronomers who need a low-power finder eyepiece to frame targets before switching to higher magnifications.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3025\" data-end=\"3103\" class=\"\"\u003e\n\u003cp data-start=\"3027\" data-end=\"3103\" class=\"\"\u003eEyeglass wearers who appreciate generous eye relief and comfortable viewing.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"3105\" data-end=\"3123\" class=\"\"\u003eConsiderations\u003c\/h3\u003e\n\u003cp data-start=\"3125\" data-end=\"3564\" class=\"\"\u003eDue to its long focal length, this eyepiece is not ideal for fast focal ratio telescopes (like f\/5 Newtonians), where the exit pupil could exceed your eye’s dilation limit and reduce perceived image brightness. Also, because of its relatively narrow apparent field of view, it won’t feel as immersive as modern wide-angle eyepieces—but it excels at what it’s designed to do: offer the longest, brightest views possible through a 2\" barrel.\u003c\/p\u003e\n\u003chr data-start=\"3566\" data-end=\"3569\" class=\"\"\u003e\n\u003cp data-start=\"3571\" data-end=\"3940\" class=\"\"\u003eIf you’re looking for a cost-effective way to unlock the widest fields your telescope can offer, the \u003cstrong data-start=\"3672\" data-end=\"3705\"\u003eCelestron Omni 56mm 2\" Plössl\u003c\/strong\u003e delivers sharp performance and dependable build quality in a classic optical design. It’s a solid addition to any serious visual astronomer’s eyepiece kit, especially if you favor deep-sky observing with long focal length instruments.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable id=\"product-specs-list\" class=\"table-open\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size (DIA):\u003c\/td\u003e\n\u003ctd\u003e50.8mm (2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length:\u003c\/td\u003e\n\u003ctd\u003e56mm (2.20\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View:\u003c\/td\u003e\n\u003ctd\u003e47°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design:\u003c\/td\u003e\n\u003ctd\u003ePlössl\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Lens Elements:\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Lens Groups:\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings:\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief:\u003c\/td\u003e\n\u003ctd\u003e52mm (2.1\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParfocal Eyepieces:\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads:\u003c\/td\u003e\n\u003ctd\u003e50.8mm (2.0\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Guard:\u003c\/td\u003e\n\u003ctd\u003eYes, rubber, fold-down\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight:\u003c\/td\u003e\n\u003ctd\u003e15 oz (425.24 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions:\u003c\/td\u003e\n\u003ctd\u003e119mm x 64mm (4.7\" x 2.5\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCalifornia Residents\u003c\/td\u003e\n\u003ctd class=\"cali-prop65-warning\"\u003eView Proposition 65 Warning\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":41626970652745,"sku":"93328","price":129.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/93328_Omni_56mm-2in_01_570x380_2x_962aefd6-8063-4279-87a3-b6386441bbaa.webp?v=1721761127"},{"product_id":"celestron-ultima-edge-30mm-2-eyepiece","title":"Celestron Ultima Edge 30mm 2\" Eyepiece  93454","description":"\u003cp data-start=\"236\" data-end=\"318\" class=\"\"\u003e\u003cstrong data-start=\"236\" data-end=\"318\"\u003eCelestron Ultima Edge 30mm 2\" Eyepiece – Flat Field, Wide View, Premium Optics\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"320\" data-end=\"744\" class=\"\"\u003eIf you're looking for a wide-field eyepiece that delivers pinpoint stars across the entire field of view—even with fast telescopes—then the Celestron Ultima Edge 30mm 2\" eyepiece deserves a serious spot in your kit. This premium wide-angle eyepiece combines modern optical design with excellent build quality, offering a sharp, immersive experience whether you're cruising the Milky Way or framing extended deep-sky objects.\u003c\/p\u003e\n\u003ch3 data-start=\"746\" data-end=\"795\" class=\"\"\u003eSharp From Edge to Edge – Even in Fast Scopes\u003c\/h3\u003e\n\u003cp data-start=\"797\" data-end=\"1166\" class=\"\"\u003eThe Ultima Edge series lives up to its name with a flat-field optical design that minimizes field curvature, keeping stars tack-sharp across the entire 70° apparent field. Many wide-field eyepieces struggle at the edges, especially in fast focal ratio scopes, but the Ultima Edge keeps the whole view crisp and clean—no need to refocus or fight off coma or astigmatism.\u003c\/p\u003e\n\u003cp data-start=\"1168\" data-end=\"1487\" class=\"\"\u003eThis makes it an ideal pairing for modern fast Newtonians, Schmidt-Cassegrains, refractors, and Dobsonians down to f\/5 and even faster systems. It's also an excellent match for coma correctors or field flatteners, making it a versatile tool for both visual observers and those who occasionally dabble in afocal imaging.\u003c\/p\u003e\n\u003ch3 data-start=\"1489\" data-end=\"1532\" class=\"\"\u003eLong Eye Relief and Comfortable Viewing\u003c\/h3\u003e\n\u003cp data-start=\"1534\" data-end=\"1925\" class=\"\"\u003eThe 30mm Ultima Edge offers a generous 22mm of eye relief, making it extremely comfortable for extended viewing sessions. Eyeglass wearers will appreciate the full field accessibility without strain, and the rubber eyecup can be left up or folded down as needed. The large 2\" format provides an expansive view without tunnel vision, giving you that “spacewalk” experience without distortion.\u003c\/p\u003e\n\u003ch3 data-start=\"1927\" data-end=\"1984\" class=\"\"\u003eFully Multi-Coated and Blackened for Maximum Contrast\u003c\/h3\u003e\n\u003cp data-start=\"1986\" data-end=\"2415\" class=\"\"\u003eCelestron coats every air-to-glass surface with their proprietary fully multi-coated optics, ensuring excellent light transmission across the visual spectrum. Internal lens edges are blackened to reduce stray light and preserve contrast, especially critical when observing faint nebulae or galaxies near bright stars or skyglow. The result is a high-contrast image with true-to-life color and better definition of subtle details.\u003c\/p\u003e\n\u003ch3 data-start=\"2417\" data-end=\"2463\" class=\"\"\u003eBuilt for Standard 2\" Focusers and Filters\u003c\/h3\u003e\n\u003cp data-start=\"2465\" data-end=\"2875\" class=\"\"\u003eThe Ultima Edge 30mm uses a standard 2\" barrel that fits securely in any 2\" focuser or diagonal. The barrel is threaded to accept 2\" filters, allowing seamless use of nebula filters, light pollution reducers, or planetary contrast filters. Its robust housing and precision-machined components provide a solid, confidence-inspiring feel, whether you're observing from your backyard or at a remote dark sky site.\u003c\/p\u003e\n\u003ch3 data-start=\"2877\" data-end=\"2917\" class=\"\"\u003eIdeal Targets and Telescope Pairings\u003c\/h3\u003e\n\u003cp data-start=\"2919\" data-end=\"3002\" class=\"\"\u003eAt 30mm focal length, this eyepiece excels at wide-field viewing. It's perfect for:\u003c\/p\u003e\n\u003cul data-start=\"3004\" data-end=\"3300\"\u003e\n\u003cli data-start=\"3004\" data-end=\"3063\" class=\"\"\u003e\n\u003cp data-start=\"3006\" data-end=\"3063\" class=\"\"\u003eSweeping star clouds in Cygnus, Sagittarius, and Auriga\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3064\" data-end=\"3144\" class=\"\"\u003e\n\u003cp data-start=\"3066\" data-end=\"3144\" class=\"\"\u003eFraming large nebulae like the North America Nebula, Veil Nebula, or Rosette\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3145\" data-end=\"3218\" class=\"\"\u003e\n\u003cp data-start=\"3147\" data-end=\"3218\" class=\"\"\u003eCapturing open clusters like the Double Cluster, M44, or the Pleiades\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3219\" data-end=\"3300\" class=\"\"\u003e\n\u003cp data-start=\"3221\" data-end=\"3300\" class=\"\"\u003eGiving you full context around extended galaxy groups or larger Messier objects\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3302\" data-end=\"3515\" class=\"\"\u003eIt performs beautifully in refractors, Newtonians, and SCTs, especially when you want a rich-field experience or need to locate faint fuzzies with the aid of a wider field before switching to higher magnification.\u003c\/p\u003e\n\u003cp data-start=\"3838\" data-end=\"4204\" class=\"\"\u003eWhether you're a seasoned observer or just upgrading your kit, the Celestron Ultima Edge 30mm 2\" eyepiece is a top-tier choice that balances wide-field performance, comfort, and build quality at a price that competes with far more expensive eyepieces. It's the kind of eyepiece that stays in your diagonal longer than you expected—because the view is just that good.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable id=\"product-specs-list\" class=\"table-open\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size Diameter:\u003c\/td\u003e\n\u003ctd\u003e2\" (50.8mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length:\u003c\/td\u003e\n\u003ctd\u003e30mm (1.18\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter:\u003c\/td\u003e\n\u003ctd\u003e30.4mm (1.2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View:\u003c\/td\u003e\n\u003ctd\u003e70°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design:\u003c\/td\u003e\n\u003ctd\u003eProprietary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Lens Elements:\u003c\/td\u003e\n\u003ctd\u003e9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Lens Groups:\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings:\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief:\u003c\/td\u003e\n\u003ctd\u003e22mm (.87\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParfocal:\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads:\u003c\/td\u003e\n\u003ctd\u003e2\" (M48.5X0.6-6H)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Guard:\u003c\/td\u003e\n\u003ctd\u003eYes- Fold Down\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material:\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight:\u003c\/td\u003e\n\u003ctd\u003e23.8 oz (674.7 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions:\u003c\/td\u003e\n\u003ctd\u003e116mm x 60mm x 60mm (4.57\" x 2.36\" x 2.36\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!----\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":41627197014089,"sku":"93454","price":299.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/93454_30mm_Ultima_Edge_Eyepiece_01._570x380_2x_54a00642-74da-4ab9-be49-2af83ed4b5bc.webp?v=1721769405"},{"product_id":"pentax-16-5mm-xw-extra-wide-angle-eyepiece","title":"Pentax 16.5mm XW Extra Wide Angle Eyepiece","description":"\u003cp\u003eThis medium focal length Pentax is a dual-purpose eyepiece for both terrestrial and astronomical observing.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eTerrestrially, \u003c\/em\u003eit is an excellent moderate power eyepiece for detailed long- and medium-distance nature studies with the 80mm and 100mm Pentax spotting scopes under virtually any lighting conditions, dawn to dusk.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eAstronomically, \u003c\/em\u003eit provides superb medium power wide field lunar and planetary observing with long focal length refractors, reflectors, or catadioptric scopes. With short focal length refractors and fast focal ratio reflectors, it gives a \"picture window on space\" image. An f\/4.5 Dobsonian reflector, for example, will yield a 3.1mm exit pupil, for bright images of emission nebulas and galaxies. Its sharpness across the field makes smaller globular clusters vivid and nearly three-dimensional. The 650mm focal length TMB-105 triplet apo refractor provides 39x, a 2.25mm exit pupil, and a 1.3-degree field (almost three times as wide as the Moon). These figures are all very usable for observing open clusters such as the Pleiades, large nebulas such as the Lagoon, and large globulars such as M-13. All will fit nicely into the field of view, with a framework of black velvet around them to set off their subtleties.\u003c\/p\u003e\n\u003cp\u003eThe long 20mm eye relief is ideal for those who \u003cem\u003emust \u003c\/em\u003e wear eyeglasses while observing due to astigmatism. Even those who do not wear glasses will find the long eye relief a comfortable change from the cramped eye relief that is typical of the usual short focal length eyepiece.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFor terrestrial observing . . . \u003cbr\u003e\u003c\/strong\u003eWith an 80mm straight-through Pentax spotting scope this eyepiece provides 36x magnification and a 102' field of view at 1000 yards, which are the values given in the specifications to the left. \u003cbr\u003eWith the 80mm \u003cem\u003eangled \u003c\/em\u003ePentax spotting scope this eyepiece provides 37x magnification and a 99' field of view at 1000 yards. \u003cbr\u003eWith the 100mm aperture Pentax spotting scope this eyepiece provides 45x magnification and an 81' field of view.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFor astronomical observing . . . \u003cbr\u003e\u003c\/strong\u003eThe field of view of 70° degrees given in the specifications to the left is the apparent field of view. The actual field of view will be equal to that apparent field divided by the magnification of the eyepiece\/telescope combination.\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e70\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view 1000 yards\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e102'\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e16.5mm\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\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e12.9 oz\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","brand":"Pentax","offers":[{"title":"Default Title","offer_id":41750945103945,"sku":"PXW16","price":526.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/Eyepieces_Square4-e1671044738543.png?v=1726598770"},{"product_id":"pentax-23mm-xw-extra-wide-angle-eyepiece","title":"Pentax 23mm XW Extra Wide Angle Eyepiece","description":"\u003cp\u003eThis medium focal length Pentax provides sharp and very wide field images for both terrestrial and astronomical observing.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eTerrestrially, \u003c\/em\u003eit is an excellent medium power wide field eyepiece for detailed close-in or wide field nature studies with the 80mm and 100mm Pentax spotting scopes in overcast and sub-par light conditions, dawn to dusk.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eAstronomically, \u003c\/em\u003eits six lens\/four group design makes it an excellent high-contrast choice for medium power deep space observing with long focal length refractors, reflectors, or catadioptric scopes. It is a superb low power eyepiece with short focal length refractors and fast focal ratio reflectors. An f\/4.5 Dobsonian reflector, for example, will yield a 4.4mm exit pupil, excellent for detailed images of emission nebulas and galaxies. Its sharpness across the field makes globular clusters and nebulas vivid and nearly three-dimensional. The 650mm focal length TMB-105 triplet apo refractor provides 28x, a 4mm exit pupil, and a 2.15-degree field (over four times as wide as the Moon). These figures are all very usable for observing open clusters such as the Pleiades; large nebulas such as the Lagoon, Veil, and Orion; and large globulars such as M-13 and Omega Centauri. All will fit nicely into the field of view, with a generous framework of black velvet sky around them to set off their subtleties.\u003c\/p\u003e\n\u003cp\u003eThe long 20mm eye relief is ideal for those who \u003cem\u003emust \u003c\/em\u003e wear eyeglasses while observing due to astigmatism. Even those who do not wear glasses will find the long eye relief a comfortable change from the cramped eye relief that is typical of the usual short focal length eyepiece.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFor terrestrial observing . . . \u003cbr\u003e\u003c\/strong\u003eWith an 80mm straight-through Pentax spotting scope this eyepiece provides 25x magnification and a huge 147' field of view at 1000 yards, which are the values given in the specifications to the left. \u003cbr\u003eWith the 80mm \u003cem\u003eangled \u003c\/em\u003ePentax spotting scope this eyepiece provides 26x magnification and a 141' field of view at 1000 yards. \u003cbr\u003eWith the 100mm aperture Pentax spotting scope this eyepiece provides 32x magnification and a big 115' field of view.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFor astronomical observing . . . \u003cbr\u003e\u003c\/strong\u003eThe field of view of 70° degrees given in the specifications to the left is the apparent field of view. The actual field of view will be equal to that apparent field divided by the magnification of the eyepiece\/telescope combination.\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\u003eBarrel Size\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEye Relief\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e70\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eField of view 1000 yards\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e147'\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e23mm\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\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e12.6 oz\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","brand":"Pentax","offers":[{"title":"Default Title","offer_id":41750945267785,"sku":"PXW23","price":546.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/Eyepieces_Square3-e1671044714574.png?v=1726598938"},{"product_id":"tele-vue-delos-24-mm-2-eyepiece","title":"Tele Vue Delos 24 mm 2\" Eyepiece","description":"\u003ch2 data-end=\"383\" data-start=\"347\"\u003eTele Vue Delos 24 mm Eyepiece\u003c\/h2\u003e\n\u003cp data-end=\"930\" data-start=\"404\"\u003eThe Delos 24 mm is more than a window into the sky — it’s an invitation.\u003c\/p\u003e\n\u003cp data-end=\"930\" data-start=\"404\"\u003eBorn from Tele Vue’s legendary optical craft, this eyepiece transforms starlight into experience. Every element is tuned for contrast and comfort: a 72-degree apparent field, 22 millimeters of true eye relief, and glass polished to reveal the faintest edge of a nebula without strain or distortion.\u003c\/p\u003e\n\u003cp data-end=\"930\" data-start=\"404\"\u003eUnder dark skies, it does what Al Nagler loved most — it teaches through beauty. Each star field feels infinite yet intimate, wide but never wasted.\u003c\/p\u003e\n\u003chr data-end=\"935\" data-start=\"932\"\u003e\n\u003ch3 data-end=\"953\" data-start=\"937\"\u003eOptics\u003c\/h3\u003e\n\u003cp data-end=\"1496\" data-start=\"954\"\u003eTele Vue designed the Delos line to preserve the clarity and neutrality of its finest glass while expanding the field to an immersive 72 degrees. The 24 mm version captures the soul of that philosophy: pinpoint stars across the field, high transmission through fully multi-coated elements, and a balance between scale and serenity that suits both refractors and large-aperture reflectors.\u003c\/p\u003e\n\u003cp data-end=\"1496\" data-start=\"954\"\u003eColor is true, edge definition unwavering, and the background sky dissolves to black — not because of marketing claims, but because the optics earn it.\u003c\/p\u003e\n\u003chr data-end=\"1501\" data-start=\"1498\"\u003e\n\u003ch3 data-end=\"1530\" data-start=\"1503\"\u003eMechanical Design\u003c\/h3\u003e\n\u003cp data-end=\"1915\" data-start=\"1531\"\u003eMachined from anodized aluminum and finished with an adjustable eyeguard, the Delos 24 mm feels deliberate in the hand. Its 2-inch barrel offers full illumination for deep-sky use, while the locking eyeguard sets an exact eye position that seals out stray light. Every click of the height adjuster feels like precision, built for observers who stay up long after the cold has settled.\u003c\/p\u003e\n\u003chr data-end=\"1920\" data-start=\"1917\"\u003e\n\u003ch3 data-end=\"1951\" data-start=\"1922\"\u003eUnder the Night Sky\u003c\/h3\u003e\n\u003cp data-end=\"2343\" data-start=\"1952\"\u003eAim it at the Pleiades, the Lagoon, or the lunar terminator — the Delos responds with crisp contrast and an ease that keeps you observing longer. The wide field feels natural, not exaggerated. You don’t scan; you drift. The stars simply \u003cem data-end=\"2196\" data-start=\"2189\"\u003eexist\u003c\/em\u003e, sharp to the edge, held in a quiet frame of optical discipline.\u003c\/p\u003e\n\u003cp data-end=\"2343\" data-start=\"1952\"\u003eIt’s an eyepiece that rewards patience: the longer you look, the more it shows.\u003c\/p\u003e\n\u003chr data-end=\"2348\" data-start=\"2345\"\u003e\n\u003ch3 data-end=\"2380\" data-start=\"2350\"\u003eObserver Impressions\u003c\/h3\u003e\n\u003cp data-end=\"2674\" data-start=\"2381\"\u003eObservers call the Delos line “effortless.” The comfort, the relief, the way the field seems to open without edge strain — these are not luxuries, but necessities for long sessions under the stars. The 24 mm sits at the heart of that series, bridging wide-field immersion and detailed clarity.\u003c\/p\u003e\n\u003chr data-end=\"2679\" data-start=\"2676\"\u003e\n\u003ch3 data-end=\"2704\" data-start=\"2681\"\u003eObserving Tip\u003c\/h3\u003e\n\u003cp data-end=\"2975\" data-start=\"2705\"\u003eSet the eyeguard to your natural eye height before focusing; once adjusted, the field holds steady and immersive. In moderate focal-length scopes, the 24 mm provides the ideal bridge between finder and detail eyepieces — wide enough to navigate, precise enough to study.\u003c\/p\u003e\n\u003chr data-end=\"2980\" data-start=\"2977\"\u003e\n\u003ch3 data-end=\"3006\" data-start=\"2982\"\u003eFinal Thoughts\u003c\/h3\u003e\n\u003cp data-end=\"3275\" data-start=\"3007\"\u003eThe Delos 24 mm is not an accessory — it’s a teacher in glass and metal.\u003cbr data-end=\"3082\" data-start=\"3079\"\u003eEvery time you lift it to the night, it reminds you why you started looking up.\u003cbr data-end=\"3164\" data-start=\"3161\"\u003eFor those who see astronomy not as a hobby but as a dialogue with the universe, this eyepiece answers fluently.\u003c\/p\u003e\n\u003ch2\u003eTech Details:\u003c\/h2\u003e\n\u003ctable data-start=\"1885\" data-end=\"2176\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead data-start=\"1885\" data-end=\"1904\"\u003e\n\u003ctr data-start=\"1885\" data-end=\"1904\"\u003e\n\u003cth data-start=\"1885\" data-end=\"1895\" data-col-size=\"sm\"\u003eFeature\u003c\/th\u003e\n\u003cth data-start=\"1895\" data-end=\"1904\" data-col-size=\"sm\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"1915\" data-end=\"2176\"\u003e\n\u003ctr data-start=\"1915\" data-end=\"1939\"\u003e\n\u003ctd data-start=\"1915\" data-end=\"1930\" data-col-size=\"sm\"\u003eFocal Length\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"1930\" data-end=\"1939\"\u003e24 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1940\" data-end=\"1972\"\u003e\n\u003ctd data-start=\"1940\" data-end=\"1965\" data-col-size=\"sm\"\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"1965\" data-end=\"1972\"\u003e72°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1973\" data-end=\"1995\"\u003e\n\u003ctd data-start=\"1973\" data-end=\"1986\" data-col-size=\"sm\"\u003eEye Relief\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"1986\" data-end=\"1995\"\u003e22 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1996\" data-end=\"2016\"\u003e\n\u003ctd data-start=\"1996\" data-end=\"2010\" data-col-size=\"sm\"\u003eBarrel Size\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"2010\" data-end=\"2016\"\u003e2″\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2017\" data-end=\"2053\"\u003e\n\u003ctd data-start=\"2017\" data-end=\"2034\" data-col-size=\"sm\"\u003eFilter Threads\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"2034\" data-end=\"2053\"\u003e2″ (M48 × 0.75)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2054\" data-end=\"2080\"\u003e\n\u003ctd data-start=\"2054\" data-end=\"2063\" data-col-size=\"sm\"\u003eWeight\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"2063\" data-end=\"2080\"\u003eApprox. 18 oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2081\" data-end=\"2114\"\u003e\n\u003ctd data-start=\"2081\" data-end=\"2103\" data-col-size=\"sm\"\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"2103\" data-end=\"2114\"\u003e29.6 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2115\" data-end=\"2176\"\u003e\n\u003ctd data-start=\"2115\" data-end=\"2140\" data-col-size=\"sm\"\u003eParfocal Compatibility\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"2140\" data-end=\"2176\"\u003eYes – with other Delos eyepieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":54816817021001,"sku":"TD24","price":551.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/EP_EDL-24.0.jpg?v=1762444287"}],"url":"https:\/\/astronomics.com\/collections\/2-eyepieces.oembed?page=2","provider":"Astronomics","version":"1.0","type":"link"}