{"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":299.99,"currency_code":"USD","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","url":"https:\/\/davidastro.com\/fr-us\/products\/explore-scientific-epwp72115ed-01","provider":"David Astro","version":"1.0","type":"link"}