{"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","url":"https:\/\/davidastro.com\/fr\/products\/explore-scientific-epwp7215ed-01","provider":"David Astro","version":"1.0","type":"link"}