{"title":"Oculaires Explore Scientific série 72°","description":"\u003cp\u003eLes oculaires Explore Scientific série 72° associent un champ apparent de 72° à du verre ED dans un boîtier étanche et purgé à l'argon. Les focales vont des 6.5mm, 8.5mm et 11.5mm pour les planètes et les étoiles doubles aux 15mm, 20mm et 25mm pour un usage général, et aux 30mm et 40mm pour les grands champs à faible grossissement.\u003c\/p\u003e\u003cp\u003eLe champ est assez large pour cadrer les grands objets tout en restant facile à embrasser d'un coup d'œil.\u003c\/p\u003e","products":[{"product_id":"explore-scientific-epwp7240ed-01","title":"Explore Scientific 72° ED 40mm Waterproof Eyepiece","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e40mm Focal Length\u003c\/li\u003e\n\u003cli\u003e72° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2-Inch Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eExtra-Low Dispersion (ED) Glass\u003c\/li\u003e\n\u003cli\u003eWaterproof and Gas-Purged Construction\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 72° ED 40mm Waterproof Eyepiece\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 72° ED 40mm Waterproof Eyepiece combines a massive 40mm focal length with an immersive 72° apparent field in a 2-inch barrel to deliver the widest possible true field of view in its series. This 40mm, 72° design is engineered to frame the largest deep-sky objects, leveraging its 2-inch format for expansive, low-magnification sweeps of the night sky.\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\u003eThe 72° Apparent Field: Framing the Largest Celestial Objects\u003c\/h3\u003e\n\u003cp\u003eWith a 40mm focal length and a 72° apparent field, this eyepiece is built for one purpose: maximizing your true field of view. It provides an immersive, \"spacewalk\" perspective that allows you to take in entire star fields and vast deep-sky objects like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000) in a single, well-framed view. For owners of long focal-length telescopes like Schmidt-Cassegrains or Maksutovs, this eyepiece serves as the ultimate finder and low-power scanning tool.\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\u003e40mm of ED Glass: High-Contrast, Color-Pure Views\u003c\/h3\u003e\n\u003cp\u003eAt the low magnifications produced by a 40mm eyepiece, controlling chromatic aberration is critical for a clean image. This eyepiece uses Extra-Low Dispersion (ED) glass to minimize color fringing, ensuring bright stars resolve to sharp points without distracting purple or blue halos. This superior color correction results in a higher-contrast view with a dark sky background, making faint nebulosity and galactic structure easier to detect.\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\u003eWaterproof 2-Inch Design for All-Weather Observing\u003c\/h3\u003e\n\u003cp\u003eBuilt for real-world observing conditions, the eyepiece is fully waterproof and gas-purged. This construction prevents internal fogging during nights with heavy dew and protects the internal lens surfaces from dust and fungus over the long term. The robust 2-inch barrel provides a secure connection to your focuser, essential for supporting an eyepiece of this class.\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\u003eExplore Scientific 72° 40mm vs. TeleVue Panoptic 41mm: Field and Correction\u003c\/h3\u003e\n\u003cp\u003eWhen choosing a low-power, 2-inch eyepiece, a key comparison is with the TeleVue Panoptic 41mm. While both eyepieces aim to maximize the true field of view, they take different design approaches.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTeleVue Panoptic 41mm Advantage:\u003c\/strong\u003e The Panoptic uses a 46mm field stop, the maximum physically possible in a 2-inch barrel. This gives it the largest possible true field of view, even though its apparent field is a narrower 68°. It is renowned for its exceptional edge-of-field correction, even in fast telescopes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific 72° 40mm Advantage:\u003c\/strong\u003e This eyepiece delivers a wider, more immersive 72° apparent field of view. For observers who prioritize the \"spacewalk\" feeling over the absolute maximum true field, the wider apparent field can provide a more engaging visual experience. The use of ED glass is also a specific design choice aimed at maximizing contrast and color purity.\u003c\/li\u003e\n\u003c\/ul\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\"\u003eWhat is the primary use for the Explore Scientific 72° ED 40mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis eyepiece is designed for \u003cstrong\u003elow-magnification, wide-field observing\u003c\/strong\u003e. Its main purpose is to act as a \"finder\" eyepiece for locating objects and for viewing very large celestial targets like the entire Veil Nebula complex, the Andromeda Galaxy (M31), or sweeping through the Milky Way's star clouds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the 72° ED 40mm eyepiece perform in my 8-inch f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt's an excellent match. In a typical 8\" f\/10 SCT with a 2000mm focal length, this eyepiece provides 50x magnification and a 4mm exit pupil, which is ideal for comfortable, bright views of deep-sky objects. It will deliver the widest possible true field of view your telescope can achieve, turning it into a capable instrument for scanning rich star fields.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 72° ED 40mm eyepiece a good choice for my f\/4.5 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt can be, but there is a trade-off. In a fast f\/4.5 telescope, this 40mm eyepiece produces a very large 8.9mm exit pupil. Since the human eye can typically only dilate to about 7mm, some of the telescope's light-gathering capability will be lost. You may also see the shadow of your telescope's secondary mirror in the center of the view. It is generally better suited for telescopes of f\/6 or slower.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"waterproof\" mean for an eyepiece like the 72° ED 40mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA waterproof eyepiece is sealed with O-rings and purged with an inert gas (like argon or nitrogen). This has two key benefits:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIt prevents moisture from getting inside the eyepiece on dewy nights, stopping internal fogging.\u003c\/li\u003e\n\u003cli\u003eIt keeps dust, pollen, and fungus from contaminating the internal lens elements, ensuring a lifetime of clear views.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy would I choose the 72° ED 40mm eyepiece over a 32mm Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile a 32mm Plössl is an excellent 1.25-inch eyepiece that also provides a wide true field, the \u003cstrong\u003eExplore Scientific 72° ED 40mm\u003c\/strong\u003e operates in a different class. It uses a 2-inch barrel to provide an even wider true field of view, lower magnification, and a more immersive 72° apparent field compared to the Plössl's ~50°. The ED glass also provides superior color correction.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use filters with the Explore Scientific 72° ED 40mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 2-inch barrel is threaded to accept standard 2-inch (48mm) astronomy filters. This eyepiece is an excellent candidate for use with nebula filters like an O-III or UHC filter when observing targets like the Orion Nebula (M42) or the Lagoon Nebula (M8), as the low magnification and bright image help offset the dimming effect of the filter.\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\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e40mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e72°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Elements\u003c\/td\u003e\n\u003ctd\u003eExtra-Low Dispersion (ED) Glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eWaterproof, Gas-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":52909340000541,"sku":"ES-EPWP7240ED-01","price":630.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-72-ED-Series-40mm-Waterproof-Eyepiece-1_6b083fee-1c99-4b34-8c00-8c8eb5180814.jpg?v=1789061321"},{"product_id":"explore-scientific-epwp7230ed-01","title":"Explore Scientific 72° ED Series 30mm Waterproof Eyepiece","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e30mm Focal Length\u003c\/li\u003e\n\u003cli\u003e72° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2-inch Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eExtra-Low Dispersion (ED) Glass\u003c\/li\u003e\n\u003cli\u003eWaterproof and Gas-Purged Construction\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 72° ED Series 30mm Waterproof Eyepiece\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 72° ED 30mm eyepiece leverages a 2-inch barrel to deliver an expansive 72° apparent field of view at a low-power 30mm focal length. This combination is engineered to produce the widest possible true field for sweeping large star fields and framing entire deep-sky objects that are too large for higher-magnification eyepieces.\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 72° Field Corrected with ED Glass\u003c\/h3\u003e\n\u003cp\u003eThe eyepiece's 72° apparent field creates a significant immersive effect, removing the sense of looking through a narrow tube. To maintain sharpness across this wide view, the optical design incorporates Extra-Low Dispersion (ED) glass. This high-grade material minimizes chromatic aberration, ensuring stars remain tight points of light and bright objects like Jupiter or the lunar limb are free of distracting color fringing, even at the edge of the field.\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\u003eThe 30mm Low-Power, Waterproof Design\u003c\/h3\u003e\n\u003cp\u003eWith its 30mm focal length, this eyepiece provides very low magnification, making it ideal for locating objects and observing large-scale structures like the North American Nebula (NGC 7000) or the full extent of the Andromeda Galaxy (M31). The fully waterproof and gas-purged body prevents internal fogging and protects the coatings from dew, ensuring reliability during long nights in humid conditions. The design also incorporates long eye relief for comfortable viewing, even with eyeglasses.\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\u003eExplore Scientific 72° 30mm vs. a Standard 32mm Plössl\u003c\/h3\u003e\n\u003cp\u003eWhile a standard 32mm Plössl is a reliable low-power eyepiece, its view is constrained by a narrower 50-52° apparent field. The Explore Scientific 72° ED 30mm offers a distinct advantage for wide-field observing.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eField of View:\u003c\/strong\u003e The 72° field of the Explore Scientific eyepiece provides a significantly larger and more immersive window into the sky compared to the Plössl's restricted view at a similar magnification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical Correction:\u003c\/strong\u003e The inclusion of ED glass gives the 72° eyepiece an edge in controlling chromatic aberration, resulting in higher contrast and sharper stars across the field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuild:\u003c\/strong\u003e A standard Plössl is rarely waterproof. The sealed, gas-purged construction of the 72° ED 30mm makes it a far more robust choice for observers who frequently deal with dew.\u003c\/li\u003e\n\u003c\/ul\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 Explore Scientific 72° 30mm eyepiece perform in an f\/10 SCT on the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis eyepiece is an excellent match for an f\/10 SCT. It will provide low magnification that allows you to frame the entire core and spiral arms of the Andromeda Galaxy (M31) in a single field of view, something impossible with standard, higher-power eyepieces. The ED glass ensures the dense star field remains sharp across the entire 72° view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 72° ED 30mm eyepiece a good choice for my fast f\/4.5 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt can be, but there is a trade-off. In an f\/4.5 telescope, this 30mm eyepiece produces a very large 6.7mm exit pupil. While this delivers a bright image, it may be larger than your eye's pupil, causing some light loss and potentially revealing the shadow of the telescope's secondary mirror. However, for sweeping the Milky Way from a dark site, the bright, wide field can be spectacular.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"ED Glass\" do for the view in the 72° 30mm eyepiece?\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 corrects for chromatic aberration, also known as \"false color.\" This means it focuses all colors of light to the same point, resulting in sharper, higher-contrast images. You'll notice this as tighter stars and a lack of purple or green fringing around bright objects like planets and bright stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need filters with the Explore Scientific 72° 30mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 2-inch barrel is threaded to accept standard 2\" astronomy filters. Because this eyepiece produces a low magnification and bright image, it pairs exceptionally well with nebula filters like a UHC or O-III. These filters will darken the sky background and dramatically increase the contrast on large emission nebulae like the Veil Nebula or the Lagoon Nebula (M8).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the waterproof feature of the 72° ED 30mm eyepiece benefit my observing sessions?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe waterproof, gas-purged construction prevents moisture from getting inside the eyepiece on dewy nights. This stops internal lens fogging, which can ruin a view and is difficult to clean. It also protects the delicate internal coatings from moisture damage and fungus, ensuring a longer lifespan for the eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the 72° field over a standard Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is immersion. A 72° apparent field of view is wide enough to fill your eye's perception, creating a \"spacewalk\" effect where the eyepiece body seems to disappear. This makes observing large open clusters like the Pleiades (M45) or scanning the Milky Way a much more engaging experience than the more constrained view of a typical 50° Plössl.\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 colspan=\"2\" style=\"text-align:center;\"\u003eNo specifications available.\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\u003cli class=\"DAV-grid-item\"\u003e\n  \u003cdiv\u003e\n    \u003cp class=\"DAV-item-title\"\u003eNo contents available.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\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":52909341802781,"sku":"ES-EPWP7230ED-01","price":560.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-72-ED-Series-30mm-Waterproof-Eyepiece-1_f8c58428-3140-4bb6-82d0-d477f514d167.jpg?v=1789061334"},{"product_id":"explore-scientific-epwp7225ed-01","title":"Explore Scientific 72° ED Series 25mm Waterproof Eyepiece","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e25mm Focal Length\u003c\/li\u003e\n\u003cli\u003e72° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2-Inch Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eExtra-Low Dispersion (ED) Glass\u003c\/li\u003e\n\u003cli\u003eWaterproof and Gas-Purged Construction\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\u003e72° ED Series 25mm Waterproof Eyepiece\u003c\/h2\u003e\n      \u003cp\u003eThe Explore Scientific 72° ED Series 25mm Waterproof Eyepiece uses a 2-inch barrel to deliver expansive, low-power views of the night sky. Its 72° apparent field of view is designed to fully contain large deep-sky objects, while the 25mm focal length produces bright images perfect for sweeping through rich star fields like the Milky Way.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eThe 72° Field: Low-Power, Immersive Views\u003c\/h3\u003e\n      \u003cp\u003eWith a 25mm focal length, this eyepiece provides low magnification, which brightens the image and widens the true field of view in your telescope. The 72° apparent field creates an immersive \"spacewalk\" effect, making it easier to frame large targets like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000) in their entirety.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n    \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eED Glass Optics in a 2-Inch Barrel\u003c\/h3\u003e\n      \u003cp\u003eThis eyepiece incorporates Extra-Low Dispersion (ED) glass to minimize chromatic aberration, or false color fringing, which is especially critical in a wide-field design. This results in sharper star points, higher contrast, and more natural color rendition across the entire 72° field. The 2-inch barrel format allows for a larger internal field stop than a 1.25-inch eyepiece, preventing vignetting and ensuring the view is bright to the edge.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n        \u003ch3\u003eWaterproof Construction and Comfortable Eye Relief\u003c\/h3\u003e\n        \u003cp\u003eThe eyepiece body is argon-purged and sealed, making it fully waterproof. This prevents internal fogging during nights with heavy dew and protects the internal lens coatings from moisture and fungus over the long term. Generous eye relief allows for comfortable viewing sessions without needing to press your eye right up against the lens, a significant benefit for all observers.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eExplore Scientific 72° 25mm vs. a Standard 25mm Plössl\u003c\/h3\u003e\n      \u003cp\u003eCompared to a traditional 25mm Plössl eyepiece, the Explore Scientific 72° ED offers two primary advantages.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWider Apparent Field:\u003c\/strong\u003e A standard Plössl typically has a 50-52° apparent field. The 72° field of this eyepiece shows a significantly larger area of sky at the same magnification, making it easier to find and frame objects.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eSuperior Color Correction:\u003c\/strong\u003e The ED glass in the Explore Scientific design provides a noticeable reduction in chromatic aberration. On bright targets like Jupiter or the lunar limb, the view through the 72° ED eyepiece will show minimal to no color fringing, while a standard Plössl may exhibit a slight purplish or yellowish halo.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the Explore Scientific 72° 25mm eyepiece's 2-inch barrel?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe \u003cstrong\u003e2-inch barrel\u003c\/strong\u003e allows for a larger physical field stop inside the eyepiece. This is essential for achieving a wide 72° apparent field of view at a long 25mm focal length without causing the edges of the view to dim or be cut off (vignetting).\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the ED glass in the 72° 25mm eyepiece improve 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 corrects for chromatic aberration. This means it focuses all colors of light to the same point, resulting in sharper stars, higher contrast, and the elimination of distracting purple or yellow color fringing around bright objects like planets and bright stars.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 72° 25mm eyepiece good for observers who wear glasses?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. The eyepiece is designed with generous eye relief, which means you can hold your eye at a comfortable distance from the lens and still see the entire 72° field of view. This makes it much more comfortable for eyeglass wearers.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is a waterproof eyepiece like the 72° ED 25mm useful?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eBeing \u003cstrong\u003ewaterproof and argon-purged\u003c\/strong\u003e prevents internal fogging on dewy nights, which can ruin an observing session. It also protects the internal multicoatings from moisture, dust, and fungus, ensuring the eyepiece lasts for many years.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow would the 72° ED 25mm eyepiece perform on the Pleiades (M45) in an 8-inch Dobsonian?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIt would be an excellent choice. An 8-inch f\/6 Dobsonian has a focal length of about 1200mm, so a 25mm eyepiece yields 48x magnification. This low power combined with the wide 72° field would beautifully frame the entire Pleiades star cluster, showing the main stars as sharp points against a dark background with hints of the surrounding nebulosity.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 72° 25mm a good \"finder\" eyepiece for an f\/10 Schmidt-Cassegrain Telescope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAbsolutely. In a typical 8-inch f\/10 SCT with a 2032mm focal length, the 25mm eyepiece provides 81x magnification and the widest possible true field of view. This makes it invaluable for locating faint galaxies and nebulae before switching to higher-power eyepieces for detailed observation.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\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":52909342949661,"sku":"ES-EPWP7225ED-01","price":490.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-72-ED-Series-25mm-Waterproof-Eyepiece-1_f7cbfb08-bde2-4fe2-a509-5356ee8c0fb2.jpg?v=1789061348"},{"product_id":"explore-scientific-epwp7265ed-01","title":"Explore Scientific 72° ED Series 6.5mm Waterproof Eyepiece","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e6.5mm Focal Length for High Magnification\u003c\/li\u003e\n\u003cli\u003e72° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eExtra-Low Dispersion (ED) Glass Element\u003c\/li\u003e\n\u003cli\u003eWaterproof and Fogproof Construction\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 72° ED Series 6.5mm Waterproof Eyepiece\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 72° ED 6.5mm eyepiece delivers high-power views of the Moon and planets through a standard 1.25\" barrel. Its 72° apparent field of view creates an immersive, wide-screen perspective, framing celestial targets with more surrounding sky than conventional designs.\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\u003eHigh-Magnification Planetary Viewing: A 6.5mm Focal Length with ED Correction\u003c\/h3\u003e\n\u003cp\u003eThe 6.5mm focal length is engineered for detailed observation, pushing the magnification of your telescope to resolve fine features on planets, lunar craterlets, and tight double stars. An Extra-Low Dispersion (ED) glass element corrects for chromatic aberration, minimizing the false color fringing that can soften planetary limbs and bright stars. This results in sharper, higher-contrast images with accurate color, making it easier to distinguish subtle cloud bands on Jupiter or the Cassini Division in Saturn's rings. However, like all high-power eyepieces, the best results from the 6.5mm focal length depend on stable atmospheric seeing conditions.\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\u003eThe 72° Apparent Field Advantage\u003c\/h3\u003e\n\u003cp\u003eCompared to the restrictive 50-52° field of a standard Plössl eyepiece, the 72° apparent field of view offers a noticeably more expansive window on the sky. This wider perspective creates a \"spacewalk\" sensation, reducing the feeling of looking down a narrow tube. For observers with non-tracking mounts like Dobsonians, this wider true field means your target stays in view longer before needing to be repositioned, allowing for more sustained and relaxed observation.\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\u003eField-Ready Ergonomics in a 1.25\" Waterproof Body\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece is fully waterproofed and internally purged, preventing moisture, dust, or fungus from contaminating the internal optics. This robust construction ensures reliability during dewy nights and makes the eyepiece easy to clean without fear of introducing fluid behind the lenses. The design also incorporates generous eye relief, providing comfortable views for extended periods and allowing eyeglass wearers to see the entire 72° field without having to press their eye to the lens.\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 will the Explore Scientific 72° ED 6.5mm eyepiece perform on Jupiter with an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn an 8\" f\/10 Schmidt-Cassegrain Telescope, the 6.5mm eyepiece will yield approximately 313x magnification. This is an ideal power for resolving fine details like Jupiter's Great Red Spot, smaller cloud belts, and festoons, provided the atmospheric seeing is steady. The ED glass will be crucial at this magnification for minimizing chromatic aberration and maximizing contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 6.5mm focal length on this 72° eyepiece good for splitting double stars like Albireo?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 6.5mm focal length is excellent for splitting close double stars. While a wide pair like Albireo (Beta Cygni) is easily split at lower powers, this eyepiece will provide the high magnification needed to resolve much tighter pairs. The sharp, high-contrast view from the ED optics will help define the separation between close stellar components.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main benefit of ED glass in the 72° 6.5mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary benefit of \u003cstrong\u003eExtra-Low Dispersion (ED) glass\u003c\/strong\u003e is the significant reduction of chromatic aberration, or false color. At high magnifications, bright objects like planets and stars can show distracting purple or blue halos in non-ED eyepieces. The ED element in this eyepiece focuses all colors of light to the same point, resulting in a sharper, higher-contrast image with true-to-life colors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Explore Scientific 72° ED 6.5mm eyepiece while wearing glasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. This eyepiece is designed with generous eye relief, which means you can hold your eye at a comfortable distance from the lens and still see the entire 72° field of view. This makes it an excellent choice for observers who need to wear glasses to correct for astigmatism.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 72° field of view on this eyepiece compare to a standard Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA standard Plössl eyepiece typically has an apparent field of view around 50-52°. The 72° field of this Explore Scientific eyepiece provides a significantly wider, more immersive viewing experience. In a non-tracking telescope, an object will take about 40% longer to drift across the field of view compared to a 50° Plössl at the same magnification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"waterproof\" mean for the 72° ED 6.5mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe waterproof designation means the eyepiece has a sealed optical housing that is purged of internal air and filled with an inert gas like nitrogen or argon. This has two key benefits:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIt prevents internal fogging when moving from a warm environment to cold night air.\u003c\/li\u003e\n\u003cli\u003eIt protects the internal lens surfaces from dew, rain, and dust, ensuring longevity and making it safe to clean the exterior lenses with cleaning solutions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\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\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e6.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e72°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eContains Extra-Low Dispersion (ED) Glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eWaterproof, Gas-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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e72° ED Series 6.5mm Waterproof Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\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":52909344522525,"sku":"ES-EPWP7265ED-01","price":420.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-72-ED-Series-6-5mm-Waterproof-Eyepiece-1_a0ff30a9-8a4a-492e-957b-947cac444ee3.jpg?v=1789061357"},{"product_id":"explore-scientific-epwp7285ed-01","title":"Explore Scientific 72° ED 8.5mm Waterproof Eyepiece","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e8.5mm Focal Length\u003c\/li\u003e\n\u003cli\u003e72° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003eExtra-Low Dispersion (ED) Glass\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eWaterproof and Gas-Purged\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 72° ED 8.5mm Waterproof Eyepiece\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 72° ED Series 8.5mm Waterproof Eyepiece delivers a wide 72° apparent field of view in a versatile 8.5mm focal length perfect for high-contrast planetary and deep-sky observation. Its 1.25-inch barrel design incorporates Extra-Low Dispersion (ED) glass to virtually eliminate chromatic aberration, ensuring sharp, color-pure views from the center to the edge of the field.\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\u003eAn 8.5mm Focal Length with ED Glass Correction\u003c\/h3\u003e\n\u003cp\u003eThe 8.5mm focal length provides significant magnification for resolving fine details on planetary surfaces, splitting tight double stars, and examining the cores of compact deep-sky objects. The inclusion of ED glass is critical at these magnifications, as it corrects for chromatic aberration—the color fringing seen around high-contrast targets like the limb of Jupiter or bright stars. This results in a cleaner, higher-contrast image where subtle details are not washed out by false color.\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\u003eThe 72° Apparent Field of View Advantage\u003c\/h3\u003e\n\u003cp\u003eWith a 72° apparent field of view, this eyepiece offers an immersive, wide-window experience that makes observing more comfortable and engaging than standard 50° designs. For users with non-tracking mounts like Dobsonians, the wider field means celestial objects stay in view longer before needing adjustment. This generous field is ideal for framing smaller open clusters and planetary nebulae within their stellar context, providing a more satisfying and complete view.\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\u003eWaterproof Design for Field Reliability\u003c\/h3\u003e\n\u003cp\u003eDesigned for real-world observing conditions, the eyepiece is fully waterproof and argon-purged. This sealed construction prevents internal fogging during nights with heavy dew and protects the internal optics from dust and moisture. This not only ensures reliable views regardless of the weather but also makes the eyepiece much easier to clean without risk of moisture seeping into the housing.\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\u003eExplore Scientific 72° ED 8.5mm vs. a Tele Vue 8mm Plössl\u003c\/h3\u003e\n\u003cp\u003eWhen choosing a premium high-magnification eyepiece, a benchmark like the Tele Vue 8mm Plössl is known for its exceptional sharpness and contrast in a compact form factor. However, the Explore Scientific 72° ED 8.5mm eyepiece presents a different set of advantages for the observer.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWider Apparent Field:\u003c\/strong\u003e The most significant difference is the 72° field of the Explore Scientific eyepiece compared to the 50° field of the Plössl. This provides a much more expansive and immersive viewing experience.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eED Glass Element:\u003c\/strong\u003e The ED glass in the 72° Series specifically targets and minimizes chromatic aberration, offering superior color correction on bright objects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSealed Construction:\u003c\/strong\u003e The waterproof and argon-purged body of the Explore Scientific eyepiece offers greater durability and resistance to dew, a feature not present in the standard Plössl design.\u003c\/li\u003e\n\u003c\/ul\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\"\u003eWhat objects are best for the Explore Scientific 72° ED 8.5mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 8.5mm focal length is excellent for high-magnification views of bright objects. It excels at resolving cloud bands on \u003cstrong\u003eJupiter\u003c\/strong\u003e, the Cassini Division in \u003cstrong\u003eSaturn's rings\u003c\/strong\u003e, and fine crater details on the \u003cstrong\u003eMoon\u003c\/strong\u003e. It's also ideal for smaller, bright deep-sky objects like the Ring Nebula (M57) and globular clusters like the Hercules Cluster (M13).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 72° field of view on the ED 8.5mm eyepiece help with a Dobsonian telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor non-tracking telescopes like a \u003cstrong\u003eDobsonian\u003c\/strong\u003e, a wider field of view is a major asset. The 72° field allows an object to drift across the eyepiece for a longer period before you need to nudge the telescope, making for more relaxed and continuous observation, especially at high power.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Explore Scientific 72° ED 8.5mm eyepiece work for observers who wear glasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this eyepiece is designed with \u003cstrong\u003elong eye relief\u003c\/strong\u003e. This allows eyeglass wearers to see the entire 72° field of view comfortably without having to press their glasses against the lens, which is often a problem with short eye relief eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of ED glass in the 8.5mm eyepiece when viewing Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhen viewing a bright planet like \u003cstrong\u003eJupiter\u003c\/strong\u003e, lesser eyepieces can show a purple or blue fringe of false color around the planet's edge. The \u003cstrong\u003eExtra-Low Dispersion (ED) glass\u003c\/strong\u003e in the Explore Scientific 72° ED 8.5mm corrects this, resulting in a sharp, high-contrast view with true-to-life colors, making it easier to see subtle details in the cloud bands.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is a waterproof eyepiece like the Explore Scientific 72° ED 8.5mm useful?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA waterproof, gas-purged design prevents dew from forming on internal lens surfaces, a common problem during long nights in humid climates. It also keeps dust and fungus out of the optical path, ensuring the eyepiece performs like new for years and can be cleaned without fear of introducing moisture inside.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 8.5mm focal length on the Explore Scientific 72° ED eyepiece compare to a 25mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn 8.5mm eyepiece provides much higher magnification than a 25mm eyepiece. In a telescope with a 1000mm focal length, the 8.5mm would yield approximately 118x magnification, while a 25mm would provide 40x. The 8.5mm is for detailed, close-up views, whereas the 25mm is for wide-field scanning and finding objects.\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\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e8.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e72°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eContains Extra-Low Dispersion (ED) Glass\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\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003eLong (Eyeglass Friendly)\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e72° ED Series 8.5mm Waterproof Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\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":52909345571101,"sku":"ES-EPWP7285ED-01","price":420.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-72-ED-Series-8-5mm-Waterproof-Eyepiece-1_0b22e52f-8524-4dc9-89f6-13e89c5c20ec.jpg?v=1789061366"},{"product_id":"explore-scientific-epwp72115ed-01","title":"Explore Scientific 72° ED Series 11.5mm Waterproof Eyepiece","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e11.5mm Focal Length\u003c\/li\u003e\n\u003cli\u003e72° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003eExtra-Low Dispersion (ED) Glass\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eWaterproof Construction\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 72° ED Series 11.5mm Waterproof Eyepiece\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 72° ED Series 11.5mm Waterproof Eyepiece delivers a wide 72° apparent field of view in a standard 1.25-inch barrel. Its 11.5mm focal length provides a versatile mid-range magnification, making it an excellent single eyepiece for capturing detailed views of the Moon, planets, and brighter deep-sky objects without needing to swap between multiple eyepieces during a session.\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\u003e72° Field and ED Glass: Immersive Views with Minimal False Color\u003c\/h3\u003e\n\u003cp\u003eThe 72° apparent field of view creates an immersive, \"spacewalk\" perspective that makes objects feel closer and more detailed. This wide window allows celestial targets to drift through the field for longer before your mount needs adjustment, enabling more relaxed and continuous observation. By incorporating Extra-Low Dispersion (ED) glass, this eyepiece virtually eliminates chromatic aberration, resulting in sharp, high-contrast images with true color fidelity, especially noticeable on bright targets like Jupiter's cloud bands or the lunar terminator.\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\u003e11.5mm Focal Length: A Versatile Workhorse for Any Target\u003c\/h3\u003e\n\u003cp\u003eThe 11.5mm focal length strikes a critical balance between magnification, field of view, and image brightness, making it a dependable workhorse for any telescope. It provides enough power to resolve details in planetary cloud belts and lunar craters while remaining wide enough for framing many open clusters and smaller nebulae. The waterproof construction and comfortable eye relief ensure it performs reliably in dewy conditions and supports long, comfortable viewing sessions, even for observers who wear glasses.\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\u003eES 72° 11.5mm vs. a 52° Plössl: The Value of a Wider Field\u003c\/h3\u003e\n\u003cp\u003eCompared to a standard Plössl eyepiece with a typical 52° field, the Explore Scientific 72° ED Series 11.5mm offers a significantly more expansive view. This isn't just about aesthetics; the wider field provides better context around your target and makes object location easier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 11mm Plössl:\u003c\/strong\u003e Delivers a narrower, more \"looking through a tube\" experience. Bright objects like the Moon can feel constrained, and star clusters may not fit entirely in the view.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific 72° 11.5mm:\u003c\/strong\u003e The wider field frames the same object with more surrounding dark sky, making the target stand out. The ED glass further enhances the view by correcting for the false color fringing that can soften images in simpler optical designs.\u003c\/li\u003e\n\u003c\/ul\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\"\u003eWhat makes the Explore Scientific 72° 11.5mm eyepiece a good all-around choice?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts \u003cstrong\u003e11.5mm focal length\u003c\/strong\u003e provides a useful medium magnification that is effective on a wide variety of objects, from planets to deep-sky targets. Combined with the immersive \u003cstrong\u003e72° apparent field of view\u003c\/strong\u003e and high-contrast optics from the ED glass, it serves as an excellent single \"grab-and-go\" eyepiece for many different telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the ED glass in the 72° 11.5mm eyepiece improve views of Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eJupiter is a very bright, high-contrast target that often shows purple or blue color fringing (chromatic aberration) in standard eyepieces. The \u003cstrong\u003eExtra-Low Dispersion (ED) glass\u003c\/strong\u003e in the Explore Scientific 72° 11.5mm eyepiece corrects this optical error, resulting in a sharper image with truer colors. You will see cleaner distinctions between the cloud bands and a more defined edge on the planet's limb.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the eye relief on the 72° 11.5mm eyepiece suitable for eyeglass wearers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the eyepiece is designed with comfortable eye relief that allows most users to see the full 72° field of view while wearing their glasses. This prevents the need to constantly remove and replace your glasses, making for a more convenient and comfortable observing session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does 'waterproof' mean for the Explore Scientific 72° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe waterproof design means the eyepiece is internally sealed and purged (typically with argon or nitrogen gas) to prevent moisture, dust, or fungus from getting inside the optical housing. This makes it highly resistant to dew and internal fogging during cold, humid nights, ensuring clear views and protecting the longevity of the internal lens coatings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the 72° 11.5mm eyepiece perform in an 8-inch f\/10 SCT on the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn an 8-inch f\/10 Schmidt-Cassegrain Telescope, the 11.5mm focal length will yield approximately 177x magnification. This is an excellent power for examining the core of the Orion Nebula (M42), easily resolving the four main stars of the Trapezium cluster (Theta-1 Orionis). The 72° field of view will beautifully frame the brightest nebulosity and surrounding starfield, offering a detailed and immersive perspective.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy choose a 72° field of view over a standard 52° Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA 72° field of view provides a much more immersive \"spacewalk\" feeling than the 52° field of a standard Plössl. It allows you to see more of the sky around your target, which is useful for star-hopping and for appreciating large objects like open clusters in their entirety. Objects also take longer to drift out of the field, allowing for more relaxed viewing.\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\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e11.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e72°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Elements\u003c\/td\u003e\n\u003ctd\u003eExtra-Low Dispersion (ED) Glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eWaterproof\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":52909346750749,"sku":"ES-EPWP72115ED-01","price":420.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-72-ED-Series-11-5mm-Waterproof-Eyepiece-1_4e82d640-4cfe-4090-a66a-b7c77ebfa4cb.jpg?v=1789061374"},{"product_id":"explore-scientific-epwp7215ed-01","title":"Explore Scientific 72° ED Series 15mm Waterproof Eyepiece","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e15mm Focal Length\u003c\/li\u003e\n\u003cli\u003e72° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Diameter Barrel\u003c\/li\u003e\n\u003cli\u003eExtra-Low Dispersion (ED) Glass\u003c\/li\u003e\n\u003cli\u003eWaterproof Construction\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\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 72° ED Series 15mm Waterproof Eyepiece\u003c\/h2\u003e\n      \u003cp\u003eThe Explore Scientific 72° ED Series 15mm Waterproof Eyepiece delivers an expansive 72-degree apparent field of view through a standard 1.25-inch barrel. This 15mm focal length provides a versatile mid-range magnification perfect for framing large star clusters and nebulae, offering an immersive perspective that simpler designs cannot match.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eA 72° Field of View: Immersive, Wide-Sky Viewing\u003c\/h3\u003e\n      \u003cp\u003eThe 72° apparent field of view creates a \"spacewalk\" experience, allowing you to see more of the sky at once without moving the telescope. This makes it far easier to locate faint objects and to appreciate the full scale of large targets like the Pleiades (M45) or the North American Nebula (NGC 7000), which can be contained within a single, dramatic frame.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n    \n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eHigh-Contrast ED Optics in a 1.25-inch Barrel\u003c\/h3\u003e\n      \u003cp\u003eThis eyepiece uses Extra-low Dispersion (ED) glass to minimize chromatic aberration, the false color fringing visible on high-contrast targets like the lunar limb, Jupiter, or bright stars. The result is a cleaner, higher-contrast image with pinpoint stars and more natural color rendition. Its waterproof construction also protects the internal optics from dew and moisture, ensuring reliability during long nights in the field.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003e72° ED 15mm vs. a 15mm Plössl: The AFOV Difference\u003c\/h3\u003e\n      \u003cp\u003eWhile a standard 15mm Plössl is a reliable, lightweight eyepiece, its field of view is typically limited to around 52°. The Explore Scientific 72° ED eyepiece offers a significantly wider window on the sky.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eImmersive Experience:\u003c\/strong\u003e The 72° field feels less like looking through a tube and more like a direct view of the cosmos, reducing the need to constantly nudge the telescope to follow an object.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eOptical Correction:\u003c\/strong\u003e The ED glass in the 72° eyepiece provides superior color correction compared to the standard achromatic glass used in most Plössls, delivering sharper, higher-contrast views of bright objects.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eTrade-Offs:\u003c\/strong\u003e A Plössl is often lighter and more compact. The 72° ED eyepiece uses more complex optics to achieve its wide, corrected field, which is reflected in its physical design.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Explore Scientific 72° 15mm eyepiece perform on the Andromeda Galaxy (M31) in an 8-inch Dobsonian?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIn a typical 8-inch f\/6 Dobsonian, the 15mm focal length yields around 81x magnification. The 72° field of view is wide enough to frame the bright core and a significant portion of the surrounding dust lanes of the Andromeda Galaxy (M31), making it an excellent choice for observing large galaxies and nebulae.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 15mm focal length of this 72° eyepiece a good choice for viewing Jupiter's moons in a 102mm refractor?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, the 15mm focal length provides a useful medium power for planetary viewing. The ED glass is particularly beneficial here, as it reduces chromatic aberration on Jupiter's bright disk, leading to a sharper view of its cloud bands and the pinpoint Galilean moons without distracting color fringing.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main benefit of the ED glass in the Explore Scientific 72° 15mm eyepiece?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe primary benefit of \u003cstrong\u003eExtra-low Dispersion (ED) glass\u003c\/strong\u003e is its ability to significantly reduce chromatic aberration. This results in sharper, higher-contrast images with truer color fidelity, especially noticeable when observing bright objects like planets, the Moon, and bright double stars like Albireo (Beta Cygni).\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 72° 15mm eyepiece suitable for observers who wear glasses?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis eyepiece is designed with generous eye relief, which makes it more comfortable for extended observing sessions. While the specific eye relief distance is not published, this design consideration generally makes it easier for eyeglass wearers to see a large portion of the field of view.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does 'waterproof' mean for the 72° ED 15mm eyepiece?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe waterproof construction means the eyepiece is internally sealed and purged, typically with an inert gas like argon or nitrogen. This prevents internal fogging and protects the lens coatings from moisture, fungus, and dust, ensuring long-term optical integrity even in dewy or humid conditions.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 72° apparent field of view on this 15mm eyepiece change the observing experience?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eA 72° apparent field of view provides a much more immersive experience than standard eyepieces (which are often around 50°). It feels more like looking out of a spaceship porthole than through a narrow tube, making it easier to scan large areas of the Milky Way and appreciate the context of deep-sky objects within their surrounding star fields.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e15mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e72°\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eLens Elements\u003c\/td\u003e\n\u003ctd\u003eExtra-Low Dispersion (ED) Glass\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eWaterproof\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003e72° ED Series 15mm Waterproof Eyepiece\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\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":52909349175581,"sku":"ES-EPWP7215ED-01","price":420.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-72-ED-Series-15mm-Waterproof-Eyepiece-1_8c3215b7-9615-415a-a836-cf1ef2c4c946.jpg?v=1789061389"},{"product_id":"explore-scientific-epwp7220ed-01","title":"Explore Scientific 72° ED Series 20mm Waterproof Eyepiece","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e20mm Focal Length\u003c\/li\u003e\n\u003cli\u003e72° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eWaterproof \u0026amp; Gas-Purged Construction\u003c\/li\u003e\n\u003cli\u003eExtra-Low Dispersion (ED) Glass\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 72° ED Series 20mm Waterproof Eyepiece\u003c\/h2\u003e\n      \u003cp\u003eThe Explore Scientific 72° ED Series 20mm Waterproof Eyepiece combines an immersive 72° apparent field of view with color-faithful Extra-Low Dispersion (ED) glass in a versatile 1.25\" barrel. This 20mm focal length serves as an ideal low-to-mid power scanning eyepiece, delivering bright, expansive views of large celestial objects and rich star fields.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eThe 72° ED Glass Advantage: Chromatic Aberration Control\u003c\/h3\u003e\n      \u003cp\u003eThis eyepiece's optical design centers on Extra-Low Dispersion (ED) glass to minimize chromatic aberration—the false color fringing seen on bright objects like stars and planetary limbs. By correcting for this distortion, the 20mm ED eyepiece produces sharper, higher-contrast images with more natural color rendition across its entire 72° apparent field.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eHigh-Contrast Views:\u003c\/strong\u003e Suppressing false color results in a darker sky background and makes faint details in nebulae and galaxies easier to discern.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eEdge-to-Edge Sharpness:\u003c\/strong\u003e The ED element helps maintain tight, point-like stars even at the edge of the wide 72° field, creating a more cohesive and immersive viewing experience.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n    \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eAll-Weather Scanning: A Waterproof 20mm Eyepiece\u003c\/h3\u003e\n      \u003cp\u003eEngineered for reliability in the field, the 72° ED 20mm eyepiece is fully waterproof and gas-purged. This prevents internal fogging during nights with heavy dew and protects the internal lens coatings from moisture and fungus, ensuring long-term durability.\u003c\/p\u003e\n        \u003cp\u003eThis robust construction, combined with a comfortable eye relief, makes it a workhorse eyepiece for extended observing sessions. Its primary role as a 20mm low-power eyepiece makes it perfect for locating objects and scanning the Milky Way, where changing temperatures and dew are common challenges.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n        \u003ch3\u003e72° ED vs. 50° Plössl: A Wider Context for Deep Sky Objects\u003c\/h3\u003e\n        \u003cp\u003eA standard 20mm Plössl eyepiece typically offers a 50-52° apparent field of view. While effective, this narrower field can feel restrictive when viewing large-scale structures. The Explore Scientific 72° ED 20mm eyepiece provides a dramatically larger window on the sky.\u003c\/p\u003e\n        \u003cul\u003e\n            \u003cli\u003e\n\u003cstrong\u003eFraming Large Targets:\u003c\/strong\u003e The 72° field allows you to frame entire objects like the Pleiades (M45) or the Andromeda Galaxy (M31) within a single view, which is often impossible with a standard Plössl at the same magnification.\u003c\/li\u003e\n            \u003cli\u003e\n\u003cstrong\u003eImmersive Experience:\u003c\/strong\u003e The wider field of view enhances the sense of \"space-walking,\" making deep-sky observing more engaging by revealing the surrounding star fields that give context to the main object.\u003c\/li\u003e\n        \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the Explore Scientific 72° ED 20mm eyepiece?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIts primary advantage is the combination of a \u003cstrong\u003ewide 72° apparent field of view\u003c\/strong\u003e with \u003cstrong\u003eExtra-Low Dispersion (ED) glass\u003c\/strong\u003e. This pairing delivers an immersive, expansive view that is also sharp and free of distracting false color (chromatic aberration), making it ideal for high-contrast deep-sky observing.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the ED glass in the 20mm eyepiece improve the view?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cstrong\u003eED glass\u003c\/strong\u003e significantly reduces chromatic aberration, which is the color fringing (often purple or blue) seen around bright stars and the edge of the Moon. By correcting this, the eyepiece produces truer colors, higher contrast, and sharper images from the center to the edge of the field.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 20mm ED eyepiece good for planetary viewing?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWhile the ED glass provides excellent color correction, a 20mm focal length typically provides low-to-medium power, which is not ideal for detailed planetary observation. It is primarily designed for sweeping star fields and viewing large deep-sky objects. For high-magnification planetary views, you would need to pair this eyepiece with a high-quality Barlow lens.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the 72° field of the 20mm eyepiece help when observing large open clusters like the Pleiades (M45)?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe expansive 72° field of view allows you to see the entire Pleiades star cluster (M45) at once, including its surrounding nebulosity, in most telescopes. A standard eyepiece with a narrower field would require you to pan around to see the full extent of the cluster, losing the impressive context of the object as a whole.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWith an 8-inch f\/10 SCT, what can I expect from the Explore Scientific 20mm ED eyepiece?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIn a typical 8\" f\/10 Schmidt-Cassegrain Telescope (2000mm focal length), the 20mm eyepiece will provide \u003cstrong\u003e100x magnification\u003c\/strong\u003e. This is an excellent medium-power magnification for this type of telescope, perfect for framing globular clusters like M13, resolving details in larger nebulae like the Orion Nebula (M42), and exploring the star clouds of the Milky Way.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does 'waterproof' mean for the Explore Scientific 72° ED 20mm eyepiece?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe waterproof and gas-purged construction means the eyepiece is sealed against the elements. This prevents moisture, dew, and dust from getting inside the eyepiece, which prevents internal fogging and protects the lens coatings from damage over time. It ensures reliable performance even in damp observing conditions.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\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\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e72°\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBarrel Diameter\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eLens Construction\u003c\/td\u003e\n\u003ctd\u003eExtra-Low Dispersion (ED) Glass\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eYes, Gas-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003e72° ED Series 20mm Waterproof Eyepiece\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\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":52909353173277,"sku":"ES-EPWP7220ED-01","price":420.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-72-ED-Series-20mm-Waterproof-Eyepiece-1_8291e35d-79c6-401e-b2b0-fa8488abcd14.jpg?v=1789061404"}],"url":"https:\/\/davidastro.com\/fr\/collections\/explore-scientific-72-series-eyepieces.oembed","provider":"David Astro","version":"1.0","type":"link"}