{"title":"Explore Scientific 92° ED Eyepieces – Sale","description":"\u003cp\u003eSave 10% on the Explore Scientific 92° ED Series waterproof eyepieces — an ultra-wide 92° apparent field with ED glass in argon-purged, waterproof housings. Sale pricing runs through October 31.\u003c\/p\u003e","products":[{"product_id":"92-ed-series-9mm-waterproof-eyepiece","title":"92° ED Series 9mm Waterproof Eyepiece","description":"\u003cp\u003eThe Explore Scientific 92 degree ED 9mm eyepiece with a 2 inch barrel is designed for high magnification viewing with an ultra wide, immersive field of view. It is ideal for observing planetary detail and smaller deep sky objects while maintaining a sense of space and scale. The 92 degree apparent field of view creates a dramatic, immersive experience that allows objects to remain in view longer and reduces the need for constant repositioning. This is especially valuable at higher magnifications.\u003c\/p\u003e\n\u003cp\u003eThe extra low dispersion glass enhances clarity by reducing chromatic aberration and improving contrast. Fine details become more visible, and color accuracy is preserved, resulting in a more refined image. The eyepiece also offers long eye relief, providing comfort during extended viewing sessions.\u003c\/p\u003e\n\u003cp\u003eThis is a premium option for those who want high magnification performance without sacrificing field of view.\u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":52950346989679,"sku":"EPWP9209ED-01","price":570.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/EPWP9209ED-01.webp?v=1776181604"},{"product_id":"92-ed-series-14mm-waterproof-eyepiece-coming-soon","title":"92° ED Series 14mm Waterproof Eyepiece","description":"\u003cp\u003eThe Explore Scientific 92 degree ED 14mm eyepiece with a 2 inch barrel offers a powerful combination of moderate magnification and an ultra wide field of view. It is well suited for a wide range of observing targets, from planetary detail to deep sky exploration. The 92 degree apparent field of view creates a highly immersive experience, allowing users to take in more of the sky at once while maintaining focus on their target. This enhances both usability and overall enjoyment.\u003c\/p\u003e\n\u003cp\u003eExtra low dispersion glass improves image quality by reducing color fringing and increasing contrast. This results in sharper, more detailed views with accurate color representation. The long eye relief ensures comfortable viewing, even during extended sessions.\u003c\/p\u003e\n\u003cp\u003eThis focal length provides excellent versatility and is a strong all around performer within the 92 degree series.\u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":52950350921839,"sku":"EPWP9214ED-01","price":570.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/EPWP9214ED-01.webp?v=1776181675"},{"product_id":"92-ed-series-20mm-waterproof-eyepiece","title":"92° ED Series 20mm Waterproof Eyepiece","description":"\u003cp\u003eThe Explore Scientific 92 degree ED 20mm eyepiece with a 2 inch barrel is designed for immersive, wide field viewing with a balance of brightness and magnification. It is particularly effective for observing deep sky objects while maintaining an expansive perspective. The ultra wide 92 degree apparent field of view creates a panoramic experience that enhances the sense of depth and scale. Objects remain in view longer, making observation more fluid and engaging.\u003c\/p\u003e\n\u003cp\u003eThe extra low dispersion glass ensures that image quality remains sharp and well corrected. Color fringing is minimized, and contrast is enhanced, resulting in a clean and detailed image. The eyepiece is built for comfort, with long eye relief that supports extended observation.\u003c\/p\u003e\n\u003cp\u003eThis focal length is ideal for those who want a wide field experience while still maintaining enough magnification to reveal structure and detail.\u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":52950357639279,"sku":"EPWP9220ED-01","price":570.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/EPWP9220ED-01.webp?v=1776181778"},{"product_id":"92-ed-series-25mm-waterproof-eyepiece","title":"Explore Scientific 92° ED Series 25mm Waterproof Eyepiece","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Explore Scientific 92° ED Series 25mm is the widest-field end of Explore Scientific's eyepiece line: a 2-inch barrel ocular with a 92° apparent field, built around extra-low-dispersion glass. At 25mm it is a low-power, wide-field eyepiece, which is the combination that produces the enveloping views large deep-sky objects reward.\u003c\/p\u003e\n\u003cp\u003e92° is past the point where the field edge sits inside your peripheral vision. In practice the boundary of the view stops registering as a circle and starts behaving like a window, and objects are seen in a surrounding star field rather than isolated in the middle of a dark disc. That effect is the entire design goal of the series, and it is why a 2-inch barrel is necessary — a field this wide at 25mm needs a field stop far larger than a 1.25-inch barrel can pass.\u003c\/p\u003e\n\u003cp\u003eExplore Scientific specifies extra-low-dispersion glass to control colour across that very wide field, extended eye relief for comfort, and waterproof construction. This is a sparsely documented product on the vendor side, and what follows works only from what Explore Scientific actually publishes.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep-sky observers with a 2-inch focuser\u003c\/strong\u003e who want the widest, most immersive low-power view available in the range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eObservers of large extended objects\u003c\/strong\u003e — the Veil, the Andromeda halo, the North America Nebula, large open clusters — that overflow a narrower field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDobsonian owners:\u003c\/strong\u003e a 92° field on an undriven mount is a long interval between nudges, and at 25mm the drift is slow to start with.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eObservers who value the surrounding star field\u003c\/strong\u003e as part of what they are looking at, rather than treating the target in isolation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnyone already invested in 2-inch eyepieces\u003c\/strong\u003e looking for the widest field in the line to sit at the low-power end of the set.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e92° apparent field of view:\u003c\/strong\u003e the widest in the Explore Scientific range, and wide enough that the field edge falls outside the eye's central attention.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtra-low-dispersion (ED) glass:\u003c\/strong\u003e reduces chromatic aberration generated inside the eyepiece itself. In a field this wide, colour control at the outer zones is one of the harder problems to solve, and ED elements are the standard answer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-inch barrel:\u003c\/strong\u003e the format that allows a field stop large enough for 92° at 25mm. It fits any 2-inch focuser or 2-inch diagonal directly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e25mm focal length:\u003c\/strong\u003e low power in most telescopes, which is what makes the very wide apparent field translate into a very wide piece of sky.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtended eye relief,\u003c\/strong\u003e specified by Explore Scientific for the series, which is what makes it possible to take in the whole 92° without pressing against the eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWaterproof construction,\u003c\/strong\u003e consistent with the sealed housings Explore Scientific uses across its waterproof eyepiece range.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLow-power deep-sky observing of large nebulae, open clusters and extended galaxies.\u003c\/li\u003e\n\u003cli\u003eWide-field sweeping through the summer and winter Milky Way.\u003c\/li\u003e\n\u003cli\u003eFraming objects that are physically large on the sky — supernova remnants, the Hyades, the Pleiades, the Double Cluster.\u003c\/li\u003e\n\u003cli\u003eObserving on a Dobsonian or another undriven mount, where apparent field is time on target.\u003c\/li\u003e\n\u003cli\u003eNebula-filter observing, where a wide field and a low power make faint extended structure easiest to see.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocuser:\u003c\/strong\u003e a 2-inch focuser or a 2-inch diagonal is needed. A 1.25-inch focuser will not accept this eyepiece, and no adapter converts downward in that direction — if your telescope is 1.25-inch only, the widest true field available comes from a 1.25-inch design with a maximum-diameter field stop, and we can point you at one.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnification:\u003c\/strong\u003e telescope focal length ÷ 25. A 663mm refractor gives 27x, a 1219mm Dobsonian 49x, a 2000mm Schmidt-Cassegrain 80x.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExit pupil:\u003c\/strong\u003e 25 ÷ the telescope's focal ratio. An f\/5.9 Dobsonian gives 4.2mm, an f\/6.5 refractor 3.8mm, an f\/10 Schmidt-Cassegrain 2.5mm. Below about f\/5 the exit pupil starts to exceed what many adult eyes dilate to.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e 2-inch eyepieces normally take 2-inch threaded filters, and a broadband or narrowband nebula filter is the natural partner for a wide low-power field. Explore Scientific does not publish the filter thread specification for this model, so we would rather check it than assume — ask us and we will confirm before you order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBalance:\u003c\/strong\u003e 2-inch ultra-wide eyepieces are typically the heaviest items in a case. Explore Scientific publishes no weight for this one, so we are not quoting a figure; on a Dobsonian it is sensible to have some balance adjustment available when swapping into a 2-inch eyepiece.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific publishes no specification table for this eyepiece.\u003c\/strong\u003e Eye relief in millimetres, field stop diameter, element and group count, weight and physical dimensions are not given on their product page, so those rows are absent from the table below rather than estimated. If one of them decides the purchase for you, ask and we will put the question to our Explore Scientific representative before you commit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWithout a published field stop figure, the true field cannot be calculated exactly.\u003c\/strong\u003e We are not going to quote a number we cannot source. The magnification arithmetic above is exact; the true field is the one figure that has to wait on Explore Scientific.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA 2-inch focuser is a requirement, not a preference.\u003c\/strong\u003e This is the one compatibility point worth settling first — send us your telescope model and we will confirm the focuser size with you.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltra-wide fields ask more of a telescope's focal ratio.\u003c\/strong\u003e In fast telescopes the outer field of any very wide eyepiece works hardest, which is part of why ED glass is in the design. In slower telescopes it is an easier job.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is a visual eyepiece.\u003c\/strong\u003e Eyepiece-projection imaging is possible with the right adapter, but the design target is the eye.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo — it slides into any 2-inch focuser or 2-inch diagonal and is ready to use. There is nothing to assemble, collimate or adjust.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat magnification will I get?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDivide your telescope's focal length in millimetres by 25. A 1000mm telescope gives 40x; a 1219mm Dobsonian gives 49x.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does 92° actually look like?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWide enough that the edge of the field sits at the boundary of where your eye naturally looks. Rather than seeing a bright circle surrounded by black, you see a field of stars that keeps going as your eye moves across it. On large clusters and nebulae that changes the character of the view rather than just the size of it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it fit my telescope?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt needs a 2-inch focuser or a 2-inch diagonal. Most larger Dobsonians and most refractors with a 2-inch focuser take it directly. If you are not sure what your telescope has, send us the model and we will check.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the ED glass change?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eExtra-low-dispersion glass brings different wavelengths closer to a common focus inside the eyepiece, so colour edges on bright stars stay cleaner across the field. In a 92° design the outer field is where that work shows, because the light is bent hardest there.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow heavy is it?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eExplore Scientific does not publish a weight for this model, so we are not going to quote one. As a class, 2-inch ultra-wide eyepieces are on the heavy side. If the exact figure matters for balancing a mount, ask us and we will get it confirmed.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: a 25mm ED-glass eyepiece with a 92° apparent field in a 2-inch waterproof barrel — the widest, most enveloping low-power view in the Explore Scientific range, aimed squarely at large deep-sky objects. Explore Scientific publishes little beyond that, so if there is a figure you need before ordering, tell us which one and we will get it from them for you.\u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":52950365372527,"sku":"EPWP9225ED-01","price":633.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/EPWP9225ED-01.webp?v=1776181861"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/collections\/EPWP9214ED-01.webp?v=1791406929","url":"https:\/\/ontariotelescope.com\/collections\/explore-scientific-92-ed-eyepieces-sale.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}