{"product_id":"explore-scientific-epwp9220ed-01","title":"Explore Scientific 92° ED Series 20mm Waterproof Eyepiece","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e92° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e20mm Focal Length\u003c\/li\u003e\n\u003cli\u003e2-Inch Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eExtra-Low Dispersion (ED) Glass Element\u003c\/li\u003e\n\u003cli\u003eWaterproof and Gas-Purged Construction\u003c\/li\u003e\n\u003cli\u003eLong Eye Relief for Viewing Comfort\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific 92° ED Series 20mm Waterproof Eyepiece\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 92° ED Series 20mm Waterproof Eyepiece combines a massive 92° apparent field of view with a versatile 20mm focal length. This design, housed in a rugged 2-inch barrel, creates a panoramic viewing experience ideal for framing large nebulae and galaxies without sacrificing the magnification needed to resolve their structure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 92° Panoramic Window on the Deep Sky\u003c\/h3\u003e\n\u003cp\u003eThe ultra-wide 92° apparent field of view fundamentally changes your connection to the night sky, creating a \"spacewalk\" effect where the eyepiece body seems to disappear. This expansive perspective allows you to frame entire star clusters and large emission nebulae like the North American Nebula (NGC 7000) in a single, immersive view. Objects also drift through the field more slowly, allowing for more relaxed, extended observation without constant adjustments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eED Glass: Color-True Views at 20mm\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the 20mm eyepiece's optical train is an element of Extra-Low Dispersion (ED) glass. This premium material corrects for chromatic aberration, minimizing the false color fringing often seen on bright stars and lunar limbs in less-corrected designs. The result is a sharper, higher-contrast image with pure color rendition, revealing subtle details in planetary atmospheres and the faint outer arms of galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBuilt for Comfort: A Waterproof 2-Inch Barrel Design\u003c\/h3\u003e\n\u003cp\u003eEngineered for real-world observing conditions, this eyepiece is fully waterproof and argon-purged. This prevents internal fogging during nights with heavy dew and protects the internal coatings from moisture and fungus for long-term durability. The design also features long eye relief, allowing you to see the full 92° field comfortably, even with eyeglasses on, making long nights at the telescope more enjoyable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 92° field of the 20mm ED eyepiece change the view of large objects like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 92° field provides a panoramic context that most eyepieces cannot. With the \u003cstrong\u003eExplore Scientific 20mm 92° eyepiece\u003c\/strong\u003e, you can frame the entire core and a significant portion of the dust lanes of the Andromeda Galaxy (M31) at once, creating a sense of scale and depth that is impossible in a narrow-field view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 20mm focal length of this 92° eyepiece a good choice for my f\/10 Schmidt-Cassegrain?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent choice. On a typical 8\" f\/10 SCT with a 2000mm focal length, the 20mm eyepiece yields 100x magnification and a 2mm exit pupil. This is a sweet spot for resolving detail in many galaxies and planetary nebulae while the 92° field provides an incredibly wide true field of view for this level of magnification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"ED Glass\" mean for the 92° 20mm eyepiece's views?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eExtra-Low Dispersion (ED) glass\u003c\/strong\u003e is a premium optical glass that significantly reduces chromatic aberration. For you, this means:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSharper Stars:\u003c\/strong\u003e Stars will appear as tight, color-pure points of light without distracting blue or purple halos.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigher Contrast:\u003c\/strong\u003e By focusing all colors to the same point, contrast is enhanced, making it easier to see faint details on planets and in nebulae.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the waterproof design on the 92° 20mm ED eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe waterproof and argon-purged construction protects your investment. It prevents internal fogging on dewy nights, which can ruin an observing session, and seals the internal optics from dust, moisture, and fungus, ensuring the eyepiece delivers crisp views for years to come.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need my glasses when using the 20mm 92° ED eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis eyepiece features \u003cstrong\u003elong eye relief\u003c\/strong\u003e, which provides a comfortable viewing distance from the top lens. This design specifically accommodates observers who wear glasses, allowing them to see the entire 92° field of view without having to remove their corrective lenses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy choose a 20mm 92° eyepiece over a lower-power, narrower-field eyepiece for finding objects?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile a lower-power eyepiece might offer a slightly wider true field, the \u003cstrong\u003e20mm 92° eyepiece\u003c\/strong\u003e provides a unique combination of a wide, immersive apparent field and enough magnification to make faint fuzzies \"pop\" against the background sky. Many observers find it easier to identify deep-sky objects in the immersive 92° field compared to looking through a narrower \"tunnel-like\" view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e92°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eED Glass element\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eWaterproof, Argon-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":52909361103133,"sku":"ES-EPWP9220ED-01","price":630.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-92-ED-Series-20mm-Waterproof-Eyepiece-1_98508514-1d9e-43b8-9da3-d6e8ba11f8c7.jpg?v=1789061440","url":"https:\/\/davidastro.com\/products\/explore-scientific-epwp9220ed-01","provider":"David Astro","version":"1.0","type":"link"}