{"title":"Explore Scientific Eyepieces","description":"\u003cp\u003eExplore Scientific eyepieces are grouped by apparent field, from the compact 52° and 62° series through the 68°, 72° and 82° series to the hyper-wide 92°, 100° and 120° models. Nearly all are waterproof and argon-purged, in 1.25\", 2\" and 3\" barrels.\u003c\/p\u003e\u003cp\u003eExamples include the 82° 8.5mm LER for comfortable high power, the 62° 40mm for low-power sweeps and the 100° 20mm for immersive deep-sky views. Choose the field width that fits your telescope and observing style.\u003c\/p\u003e","products":[{"product_id":"explore-scientific-62-9mm-waterproof-eyepiece-1-25","title":"Explore Scientific 62° 9mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e9mm Focal Length\u003c\/li\u003e\n\u003cli\u003e62° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eWaterproof \u0026amp; Argon-Purged\u003c\/li\u003e\n\u003cli\u003eFlat-Field Optical Design\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 62° 9mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 62° 9mm Waterproof Eyepiece delivers high-magnification views in a standard 1.25\" barrel, ideal for resolving fine planetary detail and splitting tight double stars. Its 62° apparent field of view provides a wider, more immersive window onto the sky than a typical Plössl design, while its flat-field optics keep stars sharp across the frame.\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 62° Flat-Field View in a 1.25\" Barrel\u003c\/h3\u003e\n\u003cp\u003eWith an apparent field of 62°, this eyepiece offers a significant upgrade in sky coverage over conventional Plössls. This wider perspective makes it easier to frame targets and track them in non-motorized mounts. The multi-element, flat-field design corrects for optical aberrations like field curvature, ensuring that stars remain tight points from the center of the field to the very edge.\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\u003eArgon-Purged Construction: A Truly Waterproof Eyepiece\u003c\/h3\u003e\n\u003cp\u003eUnlike standard eyepieces, the Explore Scientific 62° series is fully sealed and purged with inert argon gas. This process prevents internal fogging when moving from a warm house into cold night air and permanently protects the internal lens coatings from moisture, fungus, and dust. This rugged construction ensures long-term optical integrity and allows you to clean the eyepiece without fear of liquids seeping past the seals.\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\u003e9mm Focal Length for High-Contrast Planetary Detail\u003c\/h3\u003e\n\u003cp\u003eThe 9mm focal length is excellent for high-power observation of bright targets. In most telescopes, it yields the right magnification to study cloud bands on Jupiter, the Cassini Division in Saturn's rings, and fine crater detail on the Moon. The high-contrast optics make it easier to employ techniques like averted vision, where you look slightly to the side of a faint object to detect it with the more light-sensitive part of your eye—critical for teasing out detail in planetary nebulae or globular cluster cores.\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 62° 9mm vs. a Standard 52° Plössl\u003c\/h3\u003e\n\u003cp\u003eWhile a standard 9mm Plössl is a capable, affordable eyepiece, the Explore Scientific 62° model offers distinct advantages for the dedicated observer.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWider Apparent Field:\u003c\/strong\u003e The 62° field of the Explore Scientific eyepiece feels more immersive and is functionally wider than the typical 52° field of a Plössl, making it easier to locate and track objects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEdge-to-Edge Sharpness:\u003c\/strong\u003e The flat-field design of the 62° series corrects for off-axis errors that can soften stars at the edge of a Plössl's field, especially in telescopes with faster focal ratios.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll-Weather Durability:\u003c\/strong\u003e A standard Plössl is not sealed. The argon-purged, waterproof body of the Explore Scientific eyepiece protects it from dew, humidity, and dust for a lifetime of use.\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 suited for the Explore Scientific 62° 9mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 9mm focal length provides high magnification, making it ideal for observing bright, detailed objects. It excels at revealing features on \u003cstrong\u003eplanets like Jupiter and Saturn\u003c\/strong\u003e, resolving fine detail in \u003cstrong\u003elunar craters\u003c\/strong\u003e, splitting \u003cstrong\u003etight double stars\u003c\/strong\u003e, and viewing the cores of bright \u003cstrong\u003eglobular clusters\u003c\/strong\u003e like M13.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 62° field of view of this Explore Scientific eyepiece compare to a 9mm 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 \u003cstrong\u003e62° field of the Explore Scientific eyepiece provides a noticeably wider, more expansive view\u003c\/strong\u003e. This makes the observing experience more comfortable and makes it easier to keep an object within the field of view, especially with a non-tracking telescope mount.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does 'Argon-Purged Waterproof' mean for the Explore Scientific 62° 9mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis means the eyepiece barrel is sealed and filled with a dry, inert gas (argon). This has two key benefits:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIt \u003cstrong\u003eprevents internal fogging\u003c\/strong\u003e when the eyepiece is exposed to rapid temperature changes.\u003c\/li\u003e\n\u003cli\u003eIt \u003cstrong\u003eprotects the internal lens surfaces and coatings\u003c\/strong\u003e from moisture, dust, and fungus, ensuring the eyepiece maintains its optical quality for many years.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Explore Scientific 62° 9mm perform on Jupiter's cloud bands in an 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 8\" f\/10 SCT with a 2032mm focal length, the 9mm eyepiece will yield a magnification of 226x. This is an \u003cstrong\u003eexcellent magnification for viewing Jupiter\u003c\/strong\u003e, providing a large enough image to clearly resolve the primary equatorial belts, the Great Red Spot (when visible), and potentially smaller ovals and festoons during nights of steady seeing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 9mm focal length of this Explore Scientific eyepiece a good choice for splitting the Double-Double (Epsilon Lyrae) in a 4\" refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's a very good choice. A 4\" refractor has the resolving power to split the tight components of Epsilon Lyrae, which are separated by about 2.3 arcseconds. A 9mm eyepiece in a typical f\/7 4\" refractor (714mm focal length) would provide about 79x magnification, which is often enough to see the split, but higher power (around 120x or more) is ideal. The high-contrast, sharp optics of the Explore Scientific 62° 9mm will give you a clean view to attempt the split.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre the Explore Scientific 62° eyepieces parfocal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Explore Scientific 62° series is designed to be \u003cstrong\u003enear-parfocal\u003c\/strong\u003e. This means that when you switch between different eyepieces in this series, you should only need to make a very small adjustment to the focuser. This is a convenient feature that saves time and makes it easier to compare views at different magnifications.\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\u003e9mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e62°\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\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eYes, Argon-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eFlat-Field\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257018635\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\"\u003eExplore Scientific 62° 9mm Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTop Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBottom Dust Cap\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\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Explore_Scientific_Introduction_Booklet_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\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":44967199015197,"sku":"ES-EPWP6209LE-01","price":97.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-62-deg-9mm-Waterproof-Eyepiece-EPWP6209LE-01-1__49980.1594240340.1280.1280.jpg?v=1684338708"},{"product_id":"explore-scientific-62-14mm-waterproof-eyepiece-1-25","title":"Explore Scientific 62° 14mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e14mm Focal Length\u003c\/li\u003e\n\u003cli\u003e62° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eWaterproof \u0026amp; Argon-Purged Construction\u003c\/li\u003e\n\u003cli\u003eFlat-Field Multi-Element Design\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 62° 14mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 62° 14mm Waterproof Eyepiece provides a generous 62° apparent field of view, offering a more immersive window into the cosmos than standard oculars. Its 14mm focal length delivers versatile medium magnification suitable for any telescope accepting 1.25\" 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 62° Flat-Field View for High Contrast\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece is engineered as a flat-field, multi-element system, ensuring stars remain sharp across the entire 62° view. This optical correction is critical for resolving fine detail in open clusters or tracing the faint structures of nebulae right to the edge of the field stop.\u003c\/p\u003e\n\u003cp\u003eThe high-contrast optics make it easier to use averted vision—looking slightly to the side of a faint object—to detect dimmer targets. This technique places the image on a more light-sensitive part of your retina, and the clean optical design of the 62° series enhances this effect for hunting down faint galaxies and nebulosity.\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 1.25\" Barrel with Argon-Purged Durability\u003c\/h3\u003e\n\u003cp\u003eDesigned for reliability in all observing conditions, this eyepiece is fully waterproof and purged with inert argon gas. This process prevents internal fogging during nights with heavy dew and permanently seals the optics against dust, fungus, and moisture infiltration.\u003c\/p\u003e\n\u003cp\u003eThe rugged construction ensures the eyepiece can handle the rigors of travel and years of use in the field. The standard 1.25\" barrel provides compatibility with the vast majority of telescope focusers and accessories.\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 62° vs. a Standard 52° Plössl\u003c\/h3\u003e\n\u003cp\u003eCompared to a typical 50° or 52° Plössl eyepiece, the 62° apparent field of the Explore Scientific design feels noticeably wider and more engaging. While a Plössl provides a sharp center-field view, the 62° eyepiece offers a more expansive context around your target.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWider Context:\u003c\/strong\u003e The extra 10° of field makes it easier to frame larger objects like the Pleiades (M45) or keep planets within the field of view on non-driven mounts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat Field:\u003c\/strong\u003e Unlike many basic eyepieces that show distortion or softness at the edges, this eyepiece's flat-field design maintains image integrity across the view.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrade-Off:\u003c\/strong\u003e While significantly more immersive than a Plössl, the 62° field is not as vast as ultra-wide 82° or 100° eyepieces, which come at a much higher cost and weight.\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 benefit of the Explore Scientific 14mm 62° eyepiece over a kit Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary benefits are a \u003cstrong\u003ewider 62° apparent field of view\u003c\/strong\u003e for a more immersive experience, a \u003cstrong\u003eflat-field design\u003c\/strong\u003e for sharper edge-to-edge views, and its \u003cstrong\u003ewaterproof, argon-purged construction\u003c\/strong\u003e for superior durability and resistance to internal fogging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 14mm focal length perform in an 8\" f\/10 SCT for deep-sky?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 8\" f\/10 Schmidt-Cassegrain with a 2032mm focal length, the Explore Scientific 14mm eyepiece yields 145x magnification. This is an excellent medium power for resolving globular clusters like the Hercules Cluster (M13), viewing details in planetary nebulae like the Ring Nebula (M57), and darkening the sky background to enhance contrast on galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 14mm 62° eyepiece good for viewing Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, at 145x in an 8\" SCT, this eyepiece provides enough magnification to clearly resolve Jupiter's main cloud bands, the Great Red Spot, and its four Galilean moons. The high-contrast, flat-field optics ensure a sharp view of the planet without distracting aberrations at the edge of the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"Argon-Purged\" mean for the 14mm 62° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\"Argon-Purged\" means the air inside the eyepiece has been replaced with inert argon gas and then sealed. This process serves two key purposes: it \u003cstrong\u003eprevents internal lens fogging\u003c\/strong\u003e when moving from a warm house to cold outside air, and it \u003cstrong\u003eprotects the internal coatings\u003c\/strong\u003e from long-term degradation by oxidation or moisture.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre the Explore Scientific 62° series eyepieces parfocal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe manufacturer describes them as a \u003cstrong\u003e\"near parfocal\" design\u003c\/strong\u003e. This means that when you switch between different eyepieces in the 62° series, you should only need to make a very small adjustment to the focuser to regain a sharp image, which is convenient for quick comparisons between different magnifications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is a flat-field design important in the Explore Scientific 14mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA flat-field design corrects for optical aberrations that can make stars near the edge of the view appear stretched or out of focus. This ensures that stars remain sharp, pinpoint objects across the entire 62° field of view, which is especially important when observing star clusters or wide star fields.\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\u003e14mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e62°\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\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003eNot Specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eMulti-Element, Flat-Field\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\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257018628\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\"\u003e14mm 62° 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\u003cp\u003eNo manual or software is available for this product.\u003c\/p\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 Limited USA Lifetime Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967199146269,"sku":"ES-EPWP6214LE-01","price":97.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-62-deg-14mm-Waterproof-Eyepiece-EPWP6214LE-01-1__65551.1594240340.1280.1280.jpg?v=1684338712"},{"product_id":"explore-scientific-62-20mm-waterproof-eyepiece-1-25","title":"Explore Scientific 62° 20mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e1.25\" Barrel Format\u003c\/li\u003e\n\u003cli\u003eWaterproof \u0026amp; Argon-Purged\u003c\/li\u003e\n\u003cli\u003eFlat-Field Optical Design\u003c\/li\u003e\n\u003cli\u003eMulti-Coated Optics\u003c\/li\u003e\n\u003cli\u003eNear-Parfocal with 62° Series\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 62° 20mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 20mm 62° Waterproof Eyepiece is an argon-purged, flat-field ocular designed for high-contrast views of faint deep-sky objects. Its multi-element optical system delivers sharp, wide-field images, while its sealed construction ensures reliability in challenging observing conditions, making it a practical upgrade for any 1.25\" focuser.\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\u003eArgon-Purged Waterproofing for All-Weather Reliability\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece is fully sealed and purged with inert argon gas. This process prevents internal fogging during nights with heavy dew and stops dust or fungus from contaminating the internal lens surfaces, ensuring your views remain clear and high-contrast for the life of the eyepiece.\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\u003eFlat-Field Optics for High-Contrast, Edge-to-Edge Views\u003c\/h3\u003e\n\u003cp\u003eThe multi-element, flat-field optical design corrects for field curvature, keeping stars sharp across the entire field of view. This edge-to-edge sharpness combines with excellent contrast to make faint objects easier to detect, especially when using averted vision to place a target on the more light-sensitive part of your retina.\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\u003eNear-Parfocal Design for Seamless Magnification Changes\u003c\/h3\u003e\n\u003cp\u003eEngineered to be near-parfocal with other eyepieces in the Explore Scientific 62° series, this ocular minimizes the amount of refocusing needed when you switch magnifications. This convenience allows you to spend more time observing and less time adjusting focus, streamlining your journey from a low-power finder view to a high-power detail study.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the waterproof design of the Explore Scientific 20mm eyepiece benefit observing in humid conditions?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe eyepiece is \u003cstrong\u003esealed and argon-purged\u003c\/strong\u003e, which prevents moisture from getting inside. This completely stops internal fogging on humid nights, a common problem with unsealed eyepieces, ensuring your view stays clear even when dew is forming on your telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does a 'flat-field' design mean for viewing star clusters like the Pleiades (M45) with the Explore Scientific eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003eflat-field design\u003c\/strong\u003e corrects optical errors that can make stars near the edge of the view appear stretched or out of focus. When viewing a wide object like the Pleiades (M45), this means all the stars across the cluster will appear as sharp, distinct points, providing a more immersive and detailed image from edge to edge.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 20mm eyepiece suitable for observing faint galaxies in a Dobsonian telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent choice. The eyepiece's \u003cstrong\u003ehigh-contrast optics\u003c\/strong\u003e create a darker sky background, making it easier to see faint, diffuse objects like the Whirlpool Galaxy (M51). The description also highlights its suitability for \u003cstrong\u003eaverted vision\u003c\/strong\u003e, a key technique for detecting subtle details in faint galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the 'near-parfocal' feature on this Explore Scientific eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBeing \u003cstrong\u003enear-parfocal\u003c\/strong\u003e means it requires very little, if any, refocusing when you swap it with other eyepieces in the same series. This is a significant convenience, especially when tracking objects manually, as it lets you change magnification quickly without losing focus on your target.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is good contrast important in an eyepiece like this Explore Scientific model?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eHigh contrast is crucial for separating faint objects from the background sky. The advanced multi-coatings on this eyepiece maximize light transmission and suppress internal reflections, resulting in a darker background that makes faint nebulosity in objects like the Orion Nebula (M42) or the outer arms of galaxies stand out more clearly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 1.25\" Explore Scientific eyepiece work with my telescope's filter threads?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 1.25\" barrel is threaded to accept standard 1.25\" astronomy filters, such as light pollution, nebula, or color filters. This allows you to enhance your views of specific celestial objects by threading a filter directly onto the bottom of the eyepiece.\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\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257018642\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\"\u003eExplore Scientific 62° 20mm Waterproof Eyepiece - 1.25\"\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":44967199277341,"sku":"ES-EPWP6220LE-01","price":97.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-62-deg-20mm-Waterproof-Eyepiece-EPWP6220LE-01-1__99844.1594240341.1280.1280.jpg?v=1684338716"},{"product_id":"explore-scientific-62-5-5mm-waterproof-eyepiece-1-25","title":"Explore Scientific 62° 5.5mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e5.5mm Focal Length\u003c\/li\u003e\n\u003cli\u003e62° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Diameter Barrel\u003c\/li\u003e\n\u003cli\u003eWaterproof \u0026amp; Argon-Purged\u003c\/li\u003e\n\u003cli\u003eFlat-Field Multi-Element Design\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 62° 5.5mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 62° 5.5mm Waterproof Eyepiece delivers high-magnification views for planetary and double-star observation within an immersive 62° apparent field. Its 5.5mm focal length provides the power needed to resolve fine details on Jupiter's cloud bands or Saturn's rings, all housed in a rugged, argon-purged 1.25\" barrel that prevents internal fogging.\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 Flat-Field 62° View for High-Contrast Observing\u003c\/h3\u003e\n\u003cp\u003eWith a 62° apparent field, this eyepiece offers a noticeably wider and more comfortable window onto the universe than standard Plössls. The flat-field, multi-element optical design ensures sharp focus from the center to the edge of the view, a critical feature when tracking objects across the field at high power. The excellent contrast makes it easier to employ averted vision to detect faint planetary moons or subtle details in brighter nebulae.\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\u003eArgon-Purged Waterproofing in a 1.25\" Barrel\u003c\/h3\u003e\n\u003cp\u003eBuilt to withstand challenging field conditions, this eyepiece is fully waterproof and purged with inert argon gas. This process seals the internal optics, preventing moisture from fogging the lens elements during nights with heavy dew and protecting the coatings from fungus and dust over the long term. The 62° series is also designed to be near-parfocal, minimizing the amount of refocusing needed when you switch between different focal lengths in the same lineup.\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 62° 5.5mm vs. a Standard 5.5mm Plössl\u003c\/h3\u003e\n\u003cp\u003eWhile a standard Plössl eyepiece is a reliable workhorse, the Explore Scientific 62° 5.5mm represents a significant step up in several key areas.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eField of View:\u003c\/strong\u003e The Plössl design is typically limited to a 50-52° apparent field, while the ES 62° provides a wider, more immersive view that feels less like looking through a tunnel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEdge Correction:\u003c\/strong\u003e The ES 62° uses a more complex, flat-field optical design to correct for aberrations at the edge of the field, especially noticeable in faster telescopes where a Plössl might show distorted stars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e The waterproof and argon-purged construction of the ES 62° is a professional feature not found in standard eyepieces, ensuring reliability and longevity in all weather conditions.\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 Explore Scientific 62° 5.5mm eyepiece best for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eExplore Scientific 62° 5.5mm\u003c\/strong\u003e eyepiece excels at high-magnification observations. It is ideal for resolving fine detail on planets like Jupiter and Saturn, splitting tight double stars, and examining the cores of bright globular clusters like M13.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the 5.5mm Explore Scientific eyepiece perform on Jupiter with an 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn an 8\" (203mm) f\/10 Schmidt-Cassegrain Telescope with a 2032mm focal length, the \u003cstrong\u003eExplore Scientific 5.5mm eyepiece\u003c\/strong\u003e will yield approximately 369x magnification. This is a very high power, perfect for nights of steady seeing to observe details like the Great Red Spot, shadow transits of the Galilean moons, and intricate cloud bands.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 62° 5.5mm a good choice for splitting the Double Double (Epsilon Lyrae)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent choice. Splitting the tight components of Epsilon Lyrae requires high magnification and sharp optics. The \u003cstrong\u003e5.5mm focal length\u003c\/strong\u003e provides ample power in most telescopes, and the eyepiece's high-contrast, flat-field view will help you cleanly separate the four stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"Argon-Purged Waterproof\" mean for the Explore Scientific 5.5mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis means the eyepiece barrel is sealed and filled with an inert gas (argon) to prevent internal fogging on humid nights. It also protects the internal lens surfaces and coatings from dust, moisture, and fungus, ensuring a long operational life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need to refocus when switching from this 5.5mm eyepiece to others in the Explore Scientific 62° series?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Explore Scientific 62° series eyepieces are designed to be \u003cstrong\u003enear-parfocal\u003c\/strong\u003e. This means you should only need to make a very small adjustment to the focuser when changing between different focal lengths in the series, saving you time and effort during your observing session.\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 62° 5.5mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The \u003cstrong\u003e1.25\" barrel\u003c\/strong\u003e of the eyepiece is threaded to accept standard 1.25\" astronomy filters, such as planetary color filters or neutral density moon filters.\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\u003e5.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e62°\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\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eYes, Argon-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257018680\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\"\u003eExplore Scientific 62° 5.5mm Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\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":44967199310109,"sku":"ES-EPWP6255LE-01","price":97.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-62-deg-5-5mm-Waterproof-Eyepiece-EPWP6255LE-01-1__41434.1594240341.1280.1280.jpg?v=1684338720"},{"product_id":"explore-scientific-62-26mm-waterproof-eyepiece-1-25","title":"Explore Scientific 62° 26mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e26mm Focal Length\u003c\/li\u003e\n\u003cli\u003e62° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eWaterproof, Argon-Purged Construction\u003c\/li\u003e\n\u003cli\u003eFlat-Field Multi-Element Optical Design\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\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 62° 26mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 62° 26mm Waterproof Eyepiece delivers a wide 62° apparent field of view in a standard 1.25\" barrel, providing a significant upgrade over basic eyepieces. Its 26mm focal length produces low-to-medium magnification, perfect for scanning the Milky Way's star fields and framing large targets like the Orion Nebula (M42) or the Andromeda Galaxy (M31).\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 62° Flat-Field Window on the Universe\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece's multi-element, flat-field design presents a 62° apparent field that feels noticeably more immersive than a standard 50° ocular. The wider view keeps objects in the field longer in non-driven scopes and provides a \"spacewalk\" context around your primary target. The high-contrast optics make it easier to use averted vision to detect faint details, letting you place an object slightly off-center to activate the more light-sensitive parts of your eye.\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\u003eArgon-Purged Waterproofing for Dewy Nights\u003c\/h3\u003e\n\u003cp\u003eUnlike standard eyepieces, the Explore Scientific 62° 26mm is fully sealed and purged with inert argon gas. This process prevents internal fogging when moving from a warm house to cool outdoor air and stops moisture from penetrating the housing on nights with heavy dew. The sealed optics protect the delicate multi-coatings from fungus and decay, ensuring the eyepiece maintains its optical integrity for years of use in any weather condition.\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 62° 26mm vs. a Standard 25mm Plössl: A Wider Perspective\u003c\/h3\u003e\n\u003cp\u003eWhile a classic 25mm Plössl eyepiece is a reliable optic, its typical 52° field of view can feel restrictive. The Explore Scientific 62° 26mm eyepiece offers a tangible upgrade in visual immersion at a similar focal length.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlössl Advantage:\u003c\/strong\u003e A simple four-element Plössl design often has slightly higher on-axis light transmission, which can be beneficial on the brightest point-like targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific 62° Advantage:\u003c\/strong\u003e The 10° increase in apparent field makes scanning for objects easier and provides a more engaging, wide-screen view. The flat-field correction also ensures stars remain sharp closer to the edge of the field than in many basic oculars.\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 main benefit of the 62° field on the Explore Scientific 26mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e62° apparent field of view\u003c\/strong\u003e provides a wider, more immersive window into space compared to the standard 50-52° field of typical Plössl eyepieces. This makes it easier to locate objects, frame large nebulae and star clusters, and enjoy a more engaging \"spacewalk\" feeling when observing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the waterproofing on the ES 62° 26mm eyepiece actually work?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe eyepiece is completely sealed with O-rings and filled with \u003cstrong\u003einert argon gas\u003c\/strong\u003e. This process, known as gas purging, displaces all internal moisture-laden air. As a result, the internal lenses cannot fog up due to temperature changes, and the multi-coatings are protected from moisture, fungus, and dust for the life of the eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 62° 26mm a good eyepiece for my 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent choice. In a typical 8\" f\/10 SCT with a 2032mm focal length, the 26mm eyepiece will provide about 78x magnification. This is a perfect low-power magnification for locating objects, observing large open clusters like the Pleiades (M45), and viewing the full disk of the Moon.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Andromeda Galaxy (M31) look through the ES 62° 26mm eyepiece in a 10\" Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 10\" f\/4.7 Dobsonian (around 1200mm focal length), this eyepiece yields 46x magnification. This low power and the wide 62° field of view are ideal for framing the entirety of the Andromeda Galaxy (M31). You will be able to see the bright core and the extended galactic disk, along with its companion galaxies M32 and M110, all within a single field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"near parfocal\" mean for the Explore Scientific 62° series?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003e\"Near parfocal\"\u003c\/strong\u003e means that when you switch between different eyepieces in the same Explore Scientific 62° series, you will need to make only a very small adjustment to the focuser, if any at all. This saves significant time and effort when you want to change magnification quickly during an observing session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the ES 62° 26mm eyepiece good for \"averted vision\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe eyepiece's high-contrast, flat-field optics produce a dark sky background and sharp stars across the field. This clarity makes it easier to practice \u003cstrong\u003eaverted vision\u003c\/strong\u003e—looking slightly to the side of a faint object. This technique puts the object's light onto the more sensitive peripheral part of your retina, often making faint galaxies or nebular details \"pop\" into view against the dark background.\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\u003e26mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e62°\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\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eYes, Argon-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257018659\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\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":44967199375645,"sku":"ES-EPWP6226LE-01","price":111.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-62-deg-26mm-Waterproof-Eyepiece-EPWP6226LE-01-1__08180.1594240342.1280.1280.jpg?v=1684338808"},{"product_id":"explore-scientific-62-32mm-waterproof-eyepiece-2","title":"Explore Scientific 62° 32mm Waterproof Eyepiece -2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e32mm Focal Length\u003c\/li\u003e\n\u003cli\u003e62° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eWaterproof \u0026amp; Argon-Purged Construction\u003c\/li\u003e\n\u003cli\u003eFlat-Field Multi-Element Optics\u003c\/li\u003e\n\u003cli\u003eNear Parfocal Design\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 62° 32mm Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 62° 32mm Waterproof Eyepiece delivers an immersive 62° apparent field of view in a versatile 2-inch barrel format. Its 32mm focal length provides low-power, wide true fields of view, making it an ideal ocular for framing large deep-sky objects and scanning the Milky Way's star fields.\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 Flat 62° Apparent Field of View\u003c\/h3\u003e\n\u003cp\u003eStepping up from the 50-52° field of a standard Plössl, the 62° apparent field of this eyepiece provides a noticeably more immersive window on the universe. The multi-element, flat-field optical design ensures stars remain sharp across the view, not just in the center. This high-contrast optical system makes it easier to detect faint details in nebulae and galaxies, especially when using averted vision to place targets on the more light-sensitive parts of your retina.\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\u003eArgon-Purged Waterproof Construction\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece is built to withstand challenging field conditions. The optical housing is sealed and purged with inert argon gas, which prevents the formation of internal fogging when moving from a warm house to a cold observing site. This waterproofing also protects the internal lens elements and coatings from moisture, fungus, and dust over the lifetime of the eyepiece, ensuring it delivers consistent views year after year.\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 32mm Focal Length: Low Power for Faint Deep-Sky Objects\u003c\/h3\u003e\n\u003cp\u003eIn a 2-inch barrel, a 32mm focal length excels at providing low magnification and a wide true field of view, turning your telescope into a rich-field instrument. This is essential for locating objects and for observing large-scale structures like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000) in a single frame. The near-parfocal design of the 62° series also minimizes the amount of refocusing needed when switching between eyepieces in the same line.\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\"\u003eWhat is the main benefit of the Explore Scientific 32mm eyepiece being waterproof?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary benefit is durability and reliability in the field. The \u003cstrong\u003eargon-purged and sealed barrel\u003c\/strong\u003e prevents internal fogging during temperature changes, which is a common issue on dewy nights. It also protects the internal coatings from long-term damage due to moisture, ensuring the eyepiece maintains its optical clarity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 62° field of view in the Explore Scientific 32mm 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 a 50-52° apparent field of view. The \u003cstrong\u003e62° field\u003c\/strong\u003e of this Explore Scientific eyepiece offers a wider, more immersive experience without the significant cost or complexity of ultra-wide 82° or 100° designs. The view feels less like looking through a narrow tube and more like a \"spacewalk\" view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 62° 32mm eyepiece a good choice for my 8-inch f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent choice. On a typical 8\" f\/10 SCT with a 2032mm focal length, this 32mm eyepiece will provide 63.5x magnification. This low power is ideal for locating objects, scanning star fields, and viewing large targets like open clusters and emission nebulae that are too big to fit in the field of view at higher powers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Andromeda Galaxy (M31) look through the Explore Scientific 62° 32mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis eyepiece is perfectly suited for framing the Andromeda Galaxy (M31). Its low power and wide true field of view will allow you to see the galaxy's bright core and a significant portion of its extended spiral arms in a single view, along with its satellite galaxies M32 and M110. The flat field ensures stars across the view remain pinpoints, providing a rich backdrop for the galaxy.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does 'near parfocal' mean for the Explore Scientific 62° eyepiece series?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eNear parfocal\u003c\/strong\u003e means that you will need to make only minimal adjustments to your telescope's focuser when you switch between different eyepieces within the Explore Scientific 62° series. This is a convenient feature that saves time and makes comparing views at different magnifications much easier.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is a 2-inch barrel important for a 32mm eyepiece like this one?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA 1.25-inch barrel has a physical limit on the size of the field stop, which restricts the true field of view. To achieve a wide 62° apparent field at a long 32mm focal length without vignetting (darkening at the edges), a \u003cstrong\u003e2-inch barrel\u003c\/strong\u003e is necessary to accommodate a larger internal field stop, allowing for a wider true field on the sky.\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\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257018666\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\"\u003eExplore Scientific 62° 32mm Waterproof Eyepiece - 2\"\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":44967199408413,"sku":"ES-EPWP6232LE-01","price":167.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-62-deg-32mm-Waterproof-Eyepiece-EPWP6232LE-01-1__91541.1594240342.1280.1280.jpg?v=1684338812"},{"product_id":"explore-scientific-82-11mm-waterproof-eyepiece-1-25","title":"Explore Scientific 82° 11mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e11mm Focal Length\u003c\/li\u003e\n\u003cli\u003e82° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eWaterproof \u0026amp; Argon-Purged Construction\u003c\/li\u003e\n\u003cli\u003eEnhanced Multilayer Deposition (EMD) Coatings\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\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 82° 11mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 82° 11mm Waterproof Eyepiece delivers medium-high magnification in a standard 1.25\" barrel, combining a vast apparent field with rugged, all-weather construction. Its 82° field of view creates a \"spacewalk\" experience, presenting a view so wide that the eyepiece body effectively disappears, allowing you to scan detailed targets without constantly nudging your telescope.\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 82° Field: An Immersive, High-Contrast View\u003c\/h3\u003e\n\u003cp\u003eUsing a combination of low-dispersion and high-refractive-index glasses, this eyepiece is optimized for a high-contrast, flat field of view. Explore Scientific's EMD (Enhanced Multilayer Deposition) coatings maximize light transmission and minimize internal reflections, producing bright images with dark sky backgrounds.\u003c\/p\u003e\n\u003cp\u003eThe visual effect of the 82° apparent field is total immersion. Your eye relaxes, making it easier to hold faint details in view for longer periods. To preserve contrast, all internal barrel surfaces are flat black and lens edges are blackened to eliminate stray light from scattering within the optical path.\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 11mm Focal Length: All-Weather Views of Clusters and Nebulae\u003c\/h3\u003e\n\u003cp\u003eWith its 11mm focal length, this eyepiece provides the magnification needed to resolve individual stars in globular clusters like the Hercules Cluster (M13) or reveal structure in compact planetary nebulae like the Ring Nebula (M57). The argon-purged, waterproof design makes it exceptionally reliable for field use, preventing internal fogging during nights with heavy dew and protecting the coatings from moisture and fungus over the long term.\u003c\/p\u003e\n\u003cp\u003eThis magnification is also ideal for studying the bright core of comets or for initial, lower-power views of planets. When paired with Explore Scientific's focal extenders, you can increase magnification by 2x, 3x, or 5x while maintaining the eyepiece's generous eye relief and immersive 82° 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\u003e82° vs. 52° Eyepieces: The Advantage of Averted Vision\u003c\/h3\u003e\n\u003cp\u003eCompared to a standard Plössl with a 52° field, the 82° field of view offers a fundamentally different observing experience. While a Plössl presents a sharp but constrained \"porthole\" view, the 82° design lets an object drift across a much wider field, allowing for more patient study without constant adjustments to the telescope's position.\u003c\/p\u003e\n\u003cp\u003eThis expansive view is a significant advantage when observing faint objects. It allows you to use averted vision—looking slightly to the side of a target—to place its faint light onto the more sensitive peripheral parts of your retina. The wide field gives you ample dark space to comfortably look \"away\" from the object while still keeping it well within the field of view, making faint details more apparent.\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\"\u003eWhat makes the Explore Scientific 11mm 82° eyepiece \"waterproof\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe eyepiece barrel is sealed with O-rings and purged of air, which is then replaced with an inert gas, \u003cstrong\u003eargon\u003c\/strong\u003e. This process prevents moisture, dust, and fungus from ever entering the optical housing. It also means the eyepiece will not fog up internally when moving from a warm house to a cold, damp observing site.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 82° field of the Explore Scientific 11mm eyepiece help with observing faint objects?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ultra-wide 82° field provides a large, dark background around your target, which is essential for using \u003cstrong\u003eaverted vision\u003c\/strong\u003e. This technique, where you look slightly to the side of an object, makes faint details pop into view. The wide field makes it easy to do this without the object drifting out of sight, a common issue with narrower eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the best targets for the Explore Scientific 11mm 82° eyepiece in an 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 8\" f\/10 SCT with a 2032mm focal length, this 11mm eyepiece yields 185x magnification. This is an excellent power for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlobular Clusters:\u003c\/strong\u003e Resolving the dense core of M13, M92, and M15.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary Nebulae:\u003c\/strong\u003e Seeing detail and color in the Ring Nebula (M57) and the Dumbbell Nebula (M27).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGalaxies:\u003c\/strong\u003e Studying the dust lanes and bright core of the Whirlpool Galaxy (M51) or Bode's Galaxy (M81).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need to rebalance my telescope when using the Explore Scientific 11mm 82° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003ePossibly. The Explore Scientific 82° series eyepieces are substantially larger and heavier than standard Plössl or Kellner eyepieces due to their complex optical design and rugged construction. If you are switching from a much lighter 1.25\" eyepiece, you may need to adjust your counterweights or the position of your optical tube to ensure proper balance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use Barlows or focal extenders with the Explore Scientific 11mm 82° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. This eyepiece is designed to work well with focal extenders and high-quality Barlow lenses. Explore Scientific recommends their own Focal Extenders, which are designed to increase magnification without negatively impacting the eyepiece's native eye relief or wide 82° apparent field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Explore Scientific 11mm eyepiece perform on planets like Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 11mm focal length provides a powerful, detailed view of planets. On a night with steady seeing, you can expect to clearly resolve Jupiter's main cloud bands, the Great Red Spot, and the shadows of its moons during a transit. The wide 82° field is particularly enjoyable as it allows you to watch the planet and its four Galilean moons drift across the field in a single, expansive view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e11mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e82°\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\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eWaterproof, Argon-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eEnhanced Multilayer Deposition (EMD)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257014606\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\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":44967199441181,"sku":"ES-EPWP8211-01","price":209.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-82-deg-11mm-Waterproof-Eyepiece-EPWP8211-01-1__63911.1594240342.1280.1280.jpg?v=1684338815"},{"product_id":"explore-scientific-82-14mm-waterproof-eyepiece-1-25","title":"Explore Scientific 82° 14mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e14mm Focal Length\u003c\/li\u003e\n\u003cli\u003e82° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eWaterproof \u0026amp; Argon-Purged Design\u003c\/li\u003e\n\u003cli\u003eEMD (Enhanced Multilayer Deposition) Coatings\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 82° 14mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 82° 14mm Waterproof Eyepiece delivers a medium-high power view in a standard 1.25\" barrel. Its 14mm focal length is ideal for resolving details in globular star clusters and planetary nebulae. The expansive 82° apparent field of view provides a fully immersive, spacewalk-like experience that makes you feel like you're floating in space.\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 82° Immersive View at 14mm\u003c\/h3\u003e\n\u003cp\u003eWith an 82° apparent field, this eyepiece creates a window into space so wide your eye can relax and take in the entire scene. This full-immersion effect is not just dramatic; it makes it easier to use averted vision to detect faint details in nebulae or the outer arms of galaxies. The 14mm focal length provides the magnification needed to resolve individual stars in globular clusters like the Hercules Cluster (M13) or see structure in the Ring Nebula (M57).\u003c\/p\u003e\n\u003cp\u003eUsing a combination of low-dispersion and high-refractive-index glasses with Enhanced Multilayer Deposition (EMD) coatings, the optical system is optimized for high contrast and resolution. Views are sharp across the field, minimizing the need to re-center objects to see them clearly.\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 1.25\" Waterproof, Argon-Purged Eyepiece\u003c\/h3\u003e\n\u003cp\u003eDesigned for years of use in the field, this eyepiece is fully waterproof. The optical housing is purged with inert argon gas, which prevents the formation of internal fogging in damp conditions and protects the coatings from moisture, fungus, and dust. This ensures your view stays clear and the eyepiece maintains its integrity, even in challenging observing environments.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRugged Construction:\u003c\/strong\u003e A precision-machined metal barrel ensures the optical elements remain perfectly aligned for consistent, sharp images.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximized Contrast:\u003c\/strong\u003e All internal surfaces are blackened, and the lens edges are darkened to absorb stray light, preventing reflections that can wash out faint details.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Fit:\u003c\/strong\u003e The 1.25\" barrel fits any standard focuser or diagonal, making it a straightforward upgrade for virtually any telescope.\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 main advantage of the Explore Scientific 14mm eyepiece's 82° field of view?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 82° apparent field of view creates a fully immersive experience, often described as a \"spacewalk\" view. It allows your eye to relax, making it easier to observe for longer periods and to use techniques like averted vision to spot faint details that might be missed in a narrower field eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the waterproof, argon-purged design benefit the Explore Scientific 82° 14mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis design makes the eyepiece impervious to the elements. \u003cstrong\u003eArgon purging\u003c\/strong\u003e prevents internal fogging during nights with heavy dew and stops dust or fungus from getting inside the optical housing. This ensures long-term durability and consistently clear, high-contrast views, regardless of the observing conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat objects are best for the Explore Scientific 14mm 82° eyepiece in an 8\" SCT?\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, the 14mm focal length yields approximately 145x magnification. This is an excellent power for:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eResolving individual stars in bright globular clusters like M13 or M5.\u003c\/li\u003e\n\u003cli\u003eViewing planetary nebulae like the Ring Nebula (M57) or the Dumbbell Nebula (M27).\u003c\/li\u003e\n\u003cli\u003eObserving details in the cloud bands of Jupiter and the rings of Saturn.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 14mm 82° eyepiece suitable for a fast Dobsonian telescope like an f\/5?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The advanced optical design of the Explore Scientific 82° series provides good flat-field characteristics, making it a strong choice for fast telescopes like f\/5 or f\/4.7 Dobsonians. It will deliver sharp stars across most of the wide field of view with minimal distortion.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do the EMD coatings on the Explore Scientific 14mm eyepiece improve the view?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eEMD (Enhanced Multilayer Deposition) coatings are advanced anti-reflection coatings applied to all optical surfaces. They dramatically increase light transmission and reduce reflections and ghosting. The result is a brighter, higher-contrast image, which is especially critical for observing faint deep-sky objects.\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 82° 14mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 1.25\" barrel is threaded to accept standard 1.25\" astronomy filters, such as nebula filters (UHC, O-III), color filters for planetary observing, or a moon 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\u003e14mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e82°\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\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eYes, Argon-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eEnhanced Multilayer Deposition (EMD)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257014613\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":44967199473949,"sku":"ES-EPWP8214-01","price":209.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-82-deg-14mm-Waterproof-Eyepiece-EPWP8214-01-1__26427.1594240343.1280.1280.jpg?v=1684338818"},{"product_id":"explore-scientific-62-40mm-waterproof-eyepiece-2","title":"Explore Scientific 62° 40mm Waterproof Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e40mm Focal Length\u003c\/li\u003e\n\u003cli\u003e62° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" Diameter Barrel\u003c\/li\u003e\n\u003cli\u003eWaterproof \u0026amp; Argon-Purged Construction\u003c\/li\u003e\n\u003cli\u003eFlat-Field Multi-Element Optics\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 62° 40mm Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n      \u003cp\u003eThe Explore Scientific 62° 40mm eyepiece delivers the lowest practical magnification for most telescopes using its 2\" barrel, producing bright, expansive views of the night sky. Its flat-field, multi-element optical design presents a 62° apparent field of view that remains sharp to the edge. This 40mm eyepiece is fully waterproof and argon-purged, ensuring its internal optics are protected from moisture and dust for long-term reliability.\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\u003eLow-Power Immersion: A 62° Flat-Field View at 40mm\u003c\/h3\u003e\n      \u003cp\u003eWith a 40mm focal length, this eyepiece is designed to be your primary tool for locating objects and framing large-scale celestial targets. The 62° apparent field of view offers a noticeably wider and more immersive window than standard Plössl designs, creating a \"spacewalk\" effect as you sweep through star fields. Its flat-field optics correct for distortions at the edge, keeping stars sharp across the entire view.\u003c\/p\u003e\n      \u003cp\u003eThis design produces excellent contrast, making it easier to use averted vision to detect faint details in nebulae or the outer arms of galaxies. The near-parfocal design within the 62° series also means you'll spend less time refocusing when switching between eyepieces.\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\u003eAll-Weather Observing: The Argon-Purged, Waterproof Design\u003c\/h3\u003e\n      \u003cp\u003eUnlike standard eyepieces, the Explore Scientific 62° 40mm is built to withstand challenging environmental conditions. The optical housing is sealed and purged with inert argon gas, which is more effective than nitrogen at preventing internal fogging over a wider temperature range. This means you can move the eyepiece from a warm room into the cold night air without losing your view to condensation.\u003c\/p\u003e\n      \u003cp\u003eThis sealed construction also provides a permanent barrier against dust, moisture, and fungus, protecting the lens coatings and ensuring the eyepiece delivers high-contrast views for years. It's a robust, low-maintenance design for observers who don't let dew or humidity end their night.\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 62° 40mm vs. a Standard 2\" Plössl\u003c\/h3\u003e\n      \u003cp\u003eWhile a standard 2\" 40mm Plössl eyepiece may be a simpler and less expensive option, the Explore Scientific 62° model offers distinct optical and mechanical advantages.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWider Apparent Field:\u003c\/strong\u003e The primary difference is the view itself. The ES 62° eyepiece provides a 62° apparent field, which is significantly more expansive than the typical 50° field of a Plössl, making observations more engaging.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eEdge-of-Field Correction:\u003c\/strong\u003e The flat-field design of the ES 62° delivers sharper star points at the edge of the field compared to a standard Plössl, which often exhibits some softness away from the center, especially in faster telescopes.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e The waterproof, argon-purged construction of the Explore Scientific eyepiece provides a level of environmental protection and longevity that is absent in non-sealed Plössl designs.\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 benefit of the Explore Scientific 62° 40mm eyepiece?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIts primary benefit is providing a very wide \u003cstrong\u003etrue field of view\u003c\/strong\u003e with low magnification. This makes the Explore Scientific 62° 40mm an excellent \"finder\" eyepiece for locating celestial objects and for observing large deep-sky targets like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000) in their entirety.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow would the ES 62° 40mm perform on the Andromeda Galaxy (M31) in an 8\" f\/10 SCT?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIt would perform exceptionally well. In a typical 8\" f\/10 SCT with a 2032mm focal length, the 40mm eyepiece yields a magnification of 51x and a true field of view of about 1.2 degrees. This is wide enough to comfortably frame the core and a significant portion of the spiral arms of the Andromeda Galaxy (M31), providing a bright, detailed, and complete view of our galactic neighbor.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"argon-purged waterproof\" mean for the ES 62° 40mm eyepiece?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis means the eyepiece is internally sealed and filled with inert argon gas. This process offers two key advantages:\n    \u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003eIt \u003cstrong\u003eprevents internal fogging\u003c\/strong\u003e when moving the eyepiece between different temperatures, such as from a warm house to a cold observing site.\u003c\/li\u003e\n    \u003cli\u003eIt \u003cstrong\u003eprotects the internal optics\u003c\/strong\u003e from dust, moisture, and fungus, ensuring the eyepiece maintains high contrast and clarity over its lifetime.\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ES 62° 40mm eyepiece good for \"fast\" telescopes like f\/5 Newtonians?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, its \u003cstrong\u003eflat-field design\u003c\/strong\u003e makes it a good choice for faster telescopes. It will maintain sharper stars towards the edge of the 62° field of view compared to simpler designs like a Plössl. However, be aware that in an f\/5 telescope, this 40mm eyepiece will produce a very large 8mm exit pupil, which may be larger than your eye's pupil, causing some light loss and potentially making the secondary mirror shadow visible.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eI have a 12\" Dobsonian. Is the ES 62° 40mm a good finder eyepiece?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAbsolutely. For a 12\" (305mm) f\/5 Dobsonian, the 40mm eyepiece provides 38x magnification and a wide true field of view, making it an ideal first-step eyepiece for star-hopping and locating objects. The bright, expansive view helps you orient yourself in the sky before switching to higher-power eyepieces for detailed observation.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"near parfocal\" mean for the ES 62° eyepiece series?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cstrong\u003eNear parfocal\u003c\/strong\u003e means that you will only need to make minimal, if any, adjustments to your telescope's focuser when you switch between different eyepieces within the Explore Scientific 62° series. This is a convenient feature that saves time and makes comparing views at different magnifications much easier.\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\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257018673\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  \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":44967199539485,"sku":"ES-EPWP6240LE-01","price":363.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-62-deg-40mm-Waterproof-Eyepiece-EPWP6240LE-01-1__41903.1594240344.1280.1280.jpg?v=1684338821"},{"product_id":"explore-scientific-82-4-5mm-ler-waterproof-eyepiece-1-25","title":"Explore Scientific 82° 4.5mm LER Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e82° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e4.5mm High-Magnification Focal Length\u003c\/li\u003e\n\u003cli\u003e15.9mm Long Eye Relief (LER)\u003c\/li\u003e\n\u003cli\u003eArgon-Purged Waterproof Construction\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\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 82° 4.5mm LER Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 82° 4.5mm LER eyepiece delivers high-magnification views of the Moon and planets with an immersive, ultra-wide 82° apparent field of view. Its long eye relief of 15.9mm ensures comfortable viewing for all observers, including those who wear glasses. Designed for nights of steady seeing, this 4.5mm eyepiece is built to resolve fine details, from Cassini's Division in Saturn's rings to intricate structures within bright nebulae, all within a waterproof, argon-purged housing for all-weather reliability.\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\u003eImmersive 82° Views with High-Contrast EMD Coatings\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece provides an ultra-wide 82° apparent field that creates a \"spacewalk\" sensation, allowing your eye to relax and take in a vast scene. To ensure maximum contrast, the multi-element optical train uses low-dispersion glass with a high refractive index, and every lens is edge-blackened to eliminate internal reflections. Explore Scientific's Enhanced Multi-Layer Deposition (EMD) coatings maximize light transmission, delivering sharp, high-resolution images with crisp definition against a dark sky background.\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 15.9mm Eye Relief for High-Magnification Comfort\u003c\/h3\u003e\n\u003cp\u003eHigh-power observing often requires you to hold your eye steady for long periods. The 4.5mm LER eyepiece is engineered with a generous 15.9mm of eye relief, a critical feature for comfort. This extended relief allows eyeglass wearers to see the entire 82° field of view without removing their glasses and provides a more comfortable, less strenuous viewing position for everyone, preventing eye fatigue during detailed planetary 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\u003eArgon-Purged Waterproofing for All-Weather Reliability\u003c\/h3\u003e\n\u003cp\u003eField conditions are unpredictable, but your eyepiece's clarity shouldn't be. Each eyepiece in this series is O-ring sealed and purged with inert argon gas, creating a completely waterproof and internally fog-proof optical housing. This protects the internal EMD coatings from moisture, dust, and fungus, ensuring long-term durability and making the eyepiece easy to clean without fear of contaminants entering the barrel.\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-Power vs. Mid-Power: The 4.5mm LER in the 82° Series\u003c\/h3\u003e\n\u003cp\u003eThe 4.5mm focal length places this eyepiece firmly in the high-magnification category. It excels at splitting tight binary stars and resolving fine detail on planetary surfaces when atmospheric seeing is stable. In contrast, a longer focal length eyepiece from the same 82° series would provide a wider true field of view at lower power, better for framing large deep-sky objects like the Orion Nebula (M42). The trade-off for the 4.5mm's resolving power is its sensitivity to atmospheric turbulence; it demands steady skies to deliver its best views.\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\"\u003eWhat kind of viewing comfort does the Explore Scientific 4.5mm LER eyepiece offer for eyeglass wearers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Explore Scientific 4.5mm LER is designed with \u003cstrong\u003e15.9mm of long eye relief\u003c\/strong\u003e (LER). This allows observers who wear glasses for astigmatism to see the entire, immersive 82° field of view without having to press their eye against the lens, ensuring a comfortable and complete visual experience.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eOn an 8\" f\/10 SCT, what can I see on Jupiter with the Explore Scientific 4.5mm LER?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn an 8\" f\/10 Schmidt-Cassegrain Telescope, this 4.5mm eyepiece yields high magnification ideal for planetary detail. On a night of good seeing, you can expect to resolve Jupiter's main cloud belts, the Great Red Spot (if visible), and potentially smaller ovals and festoons within the zones. The four Galilean moons will appear as distinct, sharp disks.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the waterproof design of the Explore Scientific 4.5mm LER benefit observers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eargon-purged and O-ring sealed design\u003c\/strong\u003e makes the eyepiece impervious to internal fogging, even in high-humidity conditions. It also prevents dust, dew, or cleaning fluid from entering the optical housing, protecting the delicate multi-coatings and ensuring the eyepiece performs reliably in any weather.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is \"averted vision\" and how does the 82° field of the Explore Scientific 4.5mm LER help with it?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAverted vision is the technique of looking slightly to the side of a faint object to place its image on a more light-sensitive part of your retina. The ultra-wide 82° field of view of this eyepiece makes this technique more natural and effective. It provides ample space around the target, allowing you to detect faint details in nebulae or galaxies that are invisible when stared at directly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 4.5mm LER eyepiece good for deep-sky objects?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, for specific targets. While its high power is not suited for large objects like the Andromeda Galaxy (M31), it is excellent for resolving detail in smaller, brighter deep-sky objects. Use it to split the stars in the Trapezium within the Orion Nebula (M42), examine the structure of planetary nebulae like the Ring Nebula (M57), or resolve individual stars in bright 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\"\u003eWhat do the EMD coatings on the Explore Scientific 4.5mm LER eyepiece do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eEnhanced Multi-Layer Deposition (EMD) coatings\u003c\/strong\u003e are advanced anti-reflection layers applied to all optical surfaces. Their purpose is to maximize light transmission and minimize scatter, resulting in brighter images, higher contrast, and better resolution. This is especially critical for discerning subtle color variations on planets or faint details at the edge of visibility.\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\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e811803030213\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e4.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e82°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e15.9mm\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\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eYes, Argon-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated (EMD)\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":44967199572253,"sku":"ES-EPWP8245LE-01","price":209.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-4-5mm-82-deg-Series-LER-Waterproof-Eyepiece-EPWP8245LE-01-EPWP8245LE-01-1__18786.1594240345.1280.1280.jpg?v=1684338826"},{"product_id":"explore-scientific-82-6-5mm-ler-waterproof-eyepiece-1-25","title":"Explore Scientific 82° 6.5mm LER Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e6.5mm Focal Length\u003c\/li\u003e\n\u003cli\u003e82° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e16.8mm Long Eye Relief (LER)\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eArgon-Purged Waterproof 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 82° 6.5mm LER Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 82° 6.5mm LER Waterproof Eyepiece delivers high-magnification views with a generous 16.8mm of eye relief in a standard 1.25\" barrel. Its 6.5mm focal length is engineered for resolving fine planetary detail and splitting tight binary stars, while the immersive 82° apparent field of view provides a wide, comfortable context for the object, eliminating the \"looking through a straw\" feeling of narrower 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\u003eThe 6.5mm Focal Length: High-Power Views with an 82° Field\u003c\/h3\u003e\n\u003cp\u003eWith a 6.5mm focal length, this eyepiece is a specialist for high-power observation. It excels at revealing details on the Moon's surface, the cloud bands of Jupiter, and the rings of Saturn. The trade-off for this high magnification is a greater sensitivity to atmospheric seeing; on nights of excellent stability, this eyepiece can reveal stunning planetary detail and resolve the core structures of bright nebulae and globular clusters.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImmersive Views:\u003c\/strong\u003e The ultra-wide 82° apparent field of view creates a spacewalk-like experience, allowing you to use averted vision more effectively to detect faint details that might be missed in a narrower field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Contrast Optics:\u003c\/strong\u003e The design uses low-dispersion glass with a high refractive index, with all lenses fully multi-coated with Enhanced Multi-Layer Deposition (EMD) coatings and edge-blackened to maximize contrast and light transmission.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e16.8mm Long Eye Relief: Critical Comfort for Eyeglass Wearers\u003c\/h3\u003e\n\u003cp\u003eA standout feature of this eyepiece is its 16.8mm of eye relief, a critical specification for observers who wear glasses to correct for astigmatism. Unlike many high-power eyepieces that require you to press your eye against the lens, the long eye relief allows you to see the entire 82° field of view comfortably with your glasses on. This relaxed viewing posture reduces eye strain, enabling longer, more detailed observing sessions.\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\u003eArgon-Purged \u0026amp; Waterproof: A Sealed Optical System for All Conditions\u003c\/h3\u003e\n\u003cp\u003eExplore Scientific's LER eyepieces are built to withstand the elements. The optical housing is O-ring sealed and purged with inert argon gas, making it completely waterproof. This process prevents internal fogging when moving the eyepiece from a warm environment to cold outdoor temperatures and protects the internal coatings from moisture, fungus, and dust for the life of the eyepiece. This robust construction also makes cleaning the external surfaces simple and safe.\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\u003eChoosing Your Focal Length: The 6.5mm in the 82° LER Series\u003c\/h3\u003e\n\u003cp\u003eSelecting the right high-power eyepiece depends on your telescope and typical seeing conditions. Within the Explore Scientific 82° series, the 6.5mm model occupies a versatile sweet spot.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigher Power:\u003c\/strong\u003e Compared to an 11mm or 14mm eyepiece in the series, the 6.5mm provides significantly more magnification, making it the superior choice for planetary observing and resolving close double stars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeeing-Dependent:\u003c\/strong\u003e A shorter focal length, like a 4.7mm, would offer even higher magnification but would be usable on far fewer nights due to atmospheric turbulence. The 6.5mm provides a powerful view that remains practical under average-to-good seeing conditions for most locations.\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 6.5mm LER eyepiece perform on Jupiter with an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOn an 8\" f\/10 SCT, the 6.5mm eyepiece yields approximately 313x magnification. This is an excellent power for observing Jupiter's cloud bands, the Great Red Spot, and shadow transits of its moons, provided the atmospheric seeing is stable. The 82° field will comfortably frame the planet and all four Galilean moons.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 16.8mm eye relief on the Explore Scientific 6.5mm eyepiece enough for viewing with glasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. With \u003cstrong\u003e16.8mm of long eye relief\u003c\/strong\u003e, this eyepiece is specifically designed for comfort, especially for eyeglass wearers. You should be able to see the entire 82° field of view without needing to remove your glasses, which is essential if you have astigmatism.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"Argon-Purged\" mean for the Explore Scientific 82° 6.5mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\"Argon-Purged\" means the interior of the eyepiece has been filled with inert argon gas and sealed with O-rings. This makes the eyepiece \u003cstrong\u003efully waterproof\u003c\/strong\u003e and prevents internal optics from fogging up in cold or humid weather. It also protects the delicate internal coatings from dust and moisture over the long term.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 6.5mm focal length be too much magnification for my 6\" f\/5 Newtonian when viewing the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA 6\" f\/5 Newtonian has a focal length of about 762mm, so the 6.5mm eyepiece would provide around 117x magnification. While this is excellent for resolving the Trapezium cluster at the heart of the Orion Nebula (M42), it will be too powerful to fit the entire nebula in the field of view. For a full view of M42, a lower-power eyepiece (24mm or longer) would be more suitable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the 82° field of view on the 6.5mm eyepiece compared to a standard Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA standard Plössl eyepiece has an apparent field of view around 50°-52°. The \u003cstrong\u003e82° field\u003c\/strong\u003e of the Explore Scientific eyepiece provides a much wider, more immersive window onto the sky at the same magnification. This makes objects feel less constrained and allows you to more easily use averted vision to spot faint details.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I clean the Explore Scientific 6.5mm waterproof eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBecause the eyepiece is internally sealed, you only need to clean the outer lens surfaces. First, use a blower bulb to remove any loose dust or grit. Then, if needed, apply a few drops of a quality lens cleaning solution to a microfiber cloth and gently wipe the lens in a circular motion from the center to the edge.\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\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e8118030302208\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":44967199670557,"sku":"ES-EPWP8265LE-01","price":209.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-6-5mm-82-deg-Series-LER-Waterproof-Eyepiece-EPWP8265LE-01-EPWP8265LE-01-1__47841.1594240345.1280.1280.jpg?v=1684338829"},{"product_id":"explore-scientific-82-8-5mm-ler-waterproof-eyepiece-1-25","title":"Explore Scientific 82° 8.5mm LER Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e8.5mm Focal Length for High Magnification\u003c\/li\u003e\n\u003cli\u003e82° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e15mm Long Eye Relief (LER)\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eArgon-Purged Waterproof 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 82° 8.5mm LER Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 82° 8.5mm LER Waterproof Eyepiece delivers high-magnification views with an expansive 82° apparent field of view. Its 8.5mm focal length is ideal for resolving fine detail on planets and tight binary stars, while the generous 15mm of eye relief ensures the entire immersive view is accessible, even with eyeglasses. Housed in a rugged, argon-purged 1.25\" barrel, this eyepiece is sealed against the elements for consistent, fog-free observing in any 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\u003eHigh-Magnification 8.5mm Focal Length and 82° Field\u003c\/h3\u003e\n\u003cp\u003eThe 8.5mm focal length produces high power in most telescopes, perfect for nights of steady seeing when you want to examine the cloud bands of Jupiter, the Cassini Division in Saturn's rings, or the craters of the Moon. Unlike traditional high-power designs, the ultra-wide 82° apparent field creates a \"spacewalk\" sensation, making the view feel boundless and making it easier to track targets as they drift.\u003c\/p\u003e\n\u003cp\u003eThis broad field of view also enhances the use of averted vision, a technique critical for detecting faint details. By looking slightly to the side of an object like the core of the Orion Nebula (M42), you place the image on a more light-sensitive part of your eye, allowing subtle structures to materialize that are invisible with direct vision.\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\u003e15mm of Long Eye Relief for Viewing Comfort\u003c\/h3\u003e\n\u003cp\u003eMany high-power eyepieces suffer from short eye relief, forcing you to press your eye against the lens to see the full field—an impossible task for eyeglass wearers. The Explore Scientific 8.5mm LER eyepiece solves this with a comfortable 15mm of eye relief, allowing you to hold your head at a relaxed distance and see the entire 82° field, with or without glasses.\u003c\/p\u003e\n\u003cp\u003eThis focus on comfort is not a luxury; it's a critical component of serious observation. When your eye is relaxed, you can observe for longer periods without fatigue, giving you more time to pick out faint planetary details or resolve close double stars.\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 1.25\" Argon-Purged Barrel with EMD Coatings\u003c\/h3\u003e\n\u003cp\u003eBuilt to withstand real-world observing conditions, every eyepiece in the Explore Scientific 82° Series is housed in a sealed, O-ring-lined 1.25\" barrel that is purged with inert argon gas. This process makes the eyepiece completely waterproof, preventing internal fogging on dewy nights and protecting the optics from dust, pollen, and fungus for a lifetime of use.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEMD Coatings:\u003c\/strong\u003e Fully multi-coated with Enhanced Multilayer Deposition (EMD) coatings, the optics maximize light transmission for brighter images and higher contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEdge-Blackened Optics:\u003c\/strong\u003e The edges of each lens are blackened to minimize internal reflections and stray light, ensuring a dark sky background and making faint objects pop.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy Cleaning:\u003c\/strong\u003e The waterproof design means you can confidently clean the eyepiece without fear of moisture seeping into the housing, simplifying maintenance.\u003c\/li\u003e\n\u003c\/ul\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 82° 8.5mm vs. a Standard Plössl: The Immersive Difference\u003c\/h3\u003e\n\u003cp\u003eWhile a standard 8.5mm Plössl eyepiece is a functional design, it cannot match the experience delivered by the Explore Scientific 82° LER. A Plössl is often lighter and more affordable, but its optical and ergonomic limitations become clear at high power.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eField of View:\u003c\/strong\u003e The most dramatic difference is the 82° apparent field of the ES eyepiece versus the restrictive ~50° field of a Plössl. The ES 82° shows you a significantly larger, more context-rich patch of sky at the same magnification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEye Relief:\u003c\/strong\u003e A high-power Plössl typically has very short eye relief, making it uncomfortable for long sessions and unusable for most eyeglass wearers. The 15mm of relief on the ES 8.5mm is a substantial ergonomic upgrade.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImmersion:\u003c\/strong\u003e The combination of the wide field and comfortable eye relief in the ES 82° eyepiece creates an immersive, engaging view that makes you feel like you are floating in space, rather than just looking through a small porthole.\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 main advantage of the Explore Scientific 82° 8.5mm eyepiece for eyeglass wearers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is its \u003cstrong\u003e15mm of long eye relief (LER)\u003c\/strong\u003e. This generous distance allows observers who wear glasses for astigmatism to see the entire, expansive 82° field of view without removing their corrective lenses, which is often impossible with standard high-power eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 82° field of view on the ES 8.5mm eyepiece change the experience of observing planets?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile a planet like Jupiter will appear the same size, the 82° field provides a much wider, darker background of space around it. This creates a more immersive \"spacewalk\" feeling and makes it easier to track the planet's movement across the sky, especially in non-driven telescopes like Dobsonians. It also provides more room to frame the planet with its Galilean moons in a single view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 8.5mm LER eyepiece good for observing deep-sky objects like the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The 8.5mm focal length provides high magnification that is perfect for resolving fine details within brighter deep-sky objects. On the Orion Nebula (M42), this eyepiece will excel at splitting the four main stars of the Trapezium cluster at its core and revealing the intricate wisps and structures within the surrounding nebulosity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"Argon-Purged Waterproof\" mean for the ES 82° 8.5mm eyepiece in practice?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn practice, it means the eyepiece is completely sealed from the environment.\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIt will \u003cstrong\u003enot fog up internally\u003c\/strong\u003e when moving from a warm house to a cold observing site.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDust, moisture, and fungus\u003c\/strong\u003e cannot get inside the optical housing, preserving optical quality.\u003c\/li\u003e\n\u003cli\u003eYou can \u003cstrong\u003eclean it thoroughly\u003c\/strong\u003e under running water without risk, making it easy to remove dew or fingerprints.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need a Barlow lens with the Explore Scientific 8.5mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt depends on your telescope's focal length. The 8.5mm eyepiece already provides high magnification on its own. For most Schmidt-Cassegrains or long refractors, this eyepiece will be near the maximum useful power on nights of average seeing. You would only pair it with a Barlow lens on nights of exceptionally steady atmospheric conditions for planetary observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the ES 8.5mm LER eyepiece compare to a standard Plössl of a similar focal length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Explore Scientific 8.5mm offers a significantly more immersive and comfortable view. Compared to a Plössl, it has a much wider \u003cstrong\u003e82° apparent field of view\u003c\/strong\u003e (vs. ~50°), and substantially longer \u003cstrong\u003e15mm eye relief\u003c\/strong\u003e, making it far superior for eyeglass wearers and for extended observing sessions.\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\u003e82°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e15mm\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\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eYes, Argon-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eEnhanced Multilayer Deposition (EMD)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e811803030237\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\"\u003eExplore Scientific 82° 8.5mm LER Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTop Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBottom Dust Cap\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":44967199703325,"sku":"ES-EPWP8285LE-01","price":209.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-8-5mm-82-deg-Series-LER-Waterproof-Eyepiece-EPWP8285LE-01-EPWP8285LE-01-1__73330.1594240345.1280.1280.jpg?v=1684338832"},{"product_id":"explore-scientific-82-18mm-waterproof-eyepiece-2","title":"Explore Scientific 82° 18mm Waterproof Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e18mm Focal Length\u003c\/li\u003e\n\u003cli\u003e82° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" Diameter Barrel\u003c\/li\u003e\n\u003cli\u003eWaterproof and Argon-Purged Construction\u003c\/li\u003e\n\u003cli\u003eEnhanced Multilayer Deposition (EMD) Coatings\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 82° 18mm Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 82° 18mm Waterproof Eyepiece delivers an immersive, medium-power view in any 2-inch focuser, combining a vast apparent field with generous eye relief. Its 18mm focal length is perfectly suited for resolving details in globular star clusters and planetary nebulae, while the expansive 82° field of view creates a \"spacewalk\" experience that frames targets in a rich, contextual starfield.\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 18mm Focal Length: An 82° Window on Globular Clusters\u003c\/h3\u003e\n\u003cp\u003eThe 18mm focal length provides a versatile medium-high magnification, ideal for examining the bright cores of comets, planetary nebulae like the Ring Nebula (M57), and resolving individual stars in globular clusters like the Hercules Cluster (M13). The optical design uses low-dispersion and high-refractive-index glasses with Enhanced Multilayer Deposition (EMD) coatings to produce sharp, high-contrast images across its flat 82° 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 82° Immersion Experience: Long Eye Relief for Relaxed Observing\u003c\/h3\u003e\n\u003cp\u003eAn 82° apparent field of view creates a true full-immersion experience, allowing your eye to relax and take in the entire scene. This wide vista makes it easier to use averted vision—looking slightly to the side of a faint object—to detect subtle details in galactic arms or faint nebulosity. The generous eye relief ensures a comfortable viewing position, even for extended periods at the eyepiece.\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\u003eRugged 2-Inch Design: Argon-Purged and Waterproof for Field Use\u003c\/h3\u003e\n\u003cp\u003eBuilt for years of use under the stars, this eyepiece features a completely sealed, waterproof optical housing purged with inert argon gas. This process prevents internal fogging in damp conditions and protects the EMD coatings from fungus and moisture, ensuring pristine views for the life of the eyepiece. All internal surfaces are blackened, and lens edges are darkened to eliminate internal reflections and maximize image contrast.\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 18mm 82° vs. a Standard Plössl Eyepiece\u003c\/h3\u003e\n\u003cp\u003eWhile a standard Plössl eyepiece is a capable and affordable design, the Explore Scientific 82° offers a fundamentally different observing experience. A Plössl's field is typically limited to around 50°, whereas this eyepiece's 82° field reveals a significantly larger patch of sky at the same magnification.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eContextual Framing:\u003c\/strong\u003e The wider 82° field allows you to see objects within their larger celestial neighborhood, making star-hopping and target acquisition more intuitive.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Contrast:\u003c\/strong\u003e The advanced EMD coatings and superior internal baffling of the Explore Scientific 82° design deliver a darker sky background and higher contrast compared to eyepieces with standard coatings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrade-Offs:\u003c\/strong\u003e The primary advantages of a Plössl are its smaller size, lighter weight, and lower cost. However, for an immersive, high-contrast view, the 82° design is superior.\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 18mm 82° eyepiece perform on the Orion Nebula (M42) in a 10\" f\/5 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a 10\" f\/5 Dobsonian (1270mm focal length), the 18mm eyepiece yields 70x magnification. This is an excellent power for framing the entire Orion Nebula (M42) sword region, from the bright Trapezium core to the fainter outer loops of nebulosity, all within the expansive 82° field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 18mm focal length of this Explore Scientific eyepiece a good choice for viewing Jupiter's moons with an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. In a typical 8\" f\/10 SCT (2032mm focal length), this eyepiece provides 113x magnification. This is enough power to easily resolve Jupiter's four Galilean moons and see the two main equatorial cloud bands on the planet itself, all with plenty of dark sky around the planet for comfortable viewing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"Argon-Purged\" mean for the Explore Scientific 18mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eArgon purging\u003c\/strong\u003e means the air inside the sealed eyepiece barrel has been replaced with inert argon gas. This prevents internal fogging during temperature changes, seals out dust and moisture, and stops the growth of fungus on the internal lens surfaces, ensuring a lifetime of clear views.\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 18mm 82° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 2-inch barrel of the Explore Scientific 18mm eyepiece is threaded to accept standard 2-inch (M48) astronomy filters, such as light pollution, nebula, or planetary color filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the 82° field of view on the Explore Scientific 18mm eyepiece compared to a standard Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary benefit is the immersive, \"spacewalk\" feeling. An 82° field is significantly wider than the approximate 50° field of a Plössl, showing you much more of the surrounding starfield at the same magnification. This makes finding and framing objects easier and provides a more engaging view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this Explore Scientific 18mm eyepiece with a focal extender or Barlow lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. This eyepiece is fully compatible with 2-inch Barlow lenses and Explore Scientific's own Focal Extenders. Using a 2x extender, for example, would effectively turn this into a 9mm eyepiece, doubling the magnification while maintaining its comfortable eye relief and 82° apparent field.\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\u003e18mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e82°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eYes, Argon-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eEnhanced Multilayer Deposition (EMD)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257014620\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\"\u003eExplore Scientific 82° 18mm Waterproof Eyepiece - 2\"\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":44967199736093,"sku":"ES-EPWP8218-01","price":265.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-82-deg-18mm-Waterproof-Eyepiece-EPWP8218-01-1__78414.1594240346.1280.1280.jpg?v=1684338835"},{"product_id":"explore-scientific-82-24mm-waterproof-eyepiece-2","title":"Explore Scientific 82° 24mm Waterproof Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e24mm Focal Length\u003c\/li\u003e\n\u003cli\u003e82° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eArgon-Purged Waterproof Design\u003c\/li\u003e\n\u003cli\u003eEnhanced Multilayer Deposition (EMD) Coatings\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 82° 24mm Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eWith a 24mm focal length and an 82° apparent field, the Explore Scientific Waterproof Eyepiece frames deep-sky targets in a fully immersive, super-wide view. Its 2-inch barrel format is optimized for high contrast and resolution, making this eyepiece a go-to choice for upper-medium power observation of globular clusters, planetary nebulae, and comets.\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 82° Full-Immersion Field of View\u003c\/h3\u003e\n\u003cp\u003eThe 82° apparent field creates a true \"spacewalk\" viewing sensation, relaxing your eye and allowing you to use averted vision to detect faint details in nebulae and galaxies. Explore Scientific uses a combination of low-dispersion and high-refractive-index glasses with Enhanced Multilayer Deposition (EMD) coatings to deliver high-contrast, high-resolution images across a superior flat field.\u003c\/p\u003e\n\u003cp\u003eWhile the optical design provides generous eye relief, the trade-off for any ultra-wide eyepiece is increased sensitivity to optical train limitations. In very fast telescopes (f\/5 and below), you may notice some edge-of-field aberrations like astigmatism, which is a normal characteristic of wide-field designs at extreme focal ratios.\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\u003eArgon-Purged Waterproof Construction for Field Use\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece is built to withstand harsh field conditions. The optical housing is purged of all internal air and filled with inert Argon gas, which prevents internal fogging during sudden temperature drops. This waterproof seal also makes the eyepiece easier to clean, as you can rinse it under running water without fear of moisture ingress damaging the internal coatings.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRugged Barrel:\u003c\/strong\u003e The precision-machined metal lens barrel ensures perfect optical alignment for years of use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStray Light Control:\u003c\/strong\u003e All internal surfaces are flat black, and the lens edges are blackened to eliminate internal reflections and maximize image contrast.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e24mm: An Upper-Medium Power Workhorse\u003c\/h3\u003e\n\u003cp\u003eThe 24mm focal length hits a sweet spot for many telescopes, providing enough magnification to resolve details in smaller deep-sky objects without making the view too dim or narrow. It is an ideal choice for examining the cores of globular clusters like M13, resolving the structure of planetary nebulae such as the Ring Nebula (M57), or studying the bright cloud structures around a comet's nucleus.\u003c\/p\u003e\n\u003cp\u003eFor even higher power, this eyepiece maintains its native 82° apparent field and generous eye relief when paired with Explore Scientific's 2X, 3X, or 5X Focal Extenders. This allows you to effectively triple your magnification options without buying three separate high-power eyepieces.\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\"\u003eWhat makes the Explore Scientific 82° 24mm eyepiece \"waterproof\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe eyepiece is hermetically sealed and \u003cstrong\u003epurged with inert Argon gas\u003c\/strong\u003e. This process removes internal, moisture-containing air and replaces it with a dry gas, preventing internal fogging when moving from a warm house to a cold observing site. The seal also protects the internal lens elements and coatings from moisture, dew, and dust.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 82° field of view on the ES 24mm eyepiece help with observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ultra-wide 82° apparent field of view creates an immersive, \"spacewalk\" feeling that makes observing more comfortable and engaging. This wide expanse makes it easier to use \u003cstrong\u003eaverted vision\u003c\/strong\u003e—looking slightly to the side of a faint object—which places the image on a more light-sensitive part of your retina, helping you see finer, fainter details in objects like galaxies and nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the best objects to observe with the Explore Scientific 24mm 82° eyepiece in an f\/10 SCT?\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, this 24mm eyepiece yields about 85x magnification, which is ideal for a wide range of deep-sky objects. It excels at framing moderately sized targets in their entirety, such as:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGlobular Clusters like the Hercules Cluster (M13) and M5.\u003c\/li\u003e\n\u003cli\u003eBright Planetary Nebulae like the Ring Nebula (M57) and the Dumbbell Nebula (M27).\u003c\/li\u003e\n\u003cli\u003eGalaxies where you want to resolve some core detail, such as Bode's Galaxy (M81).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Explore Scientific 24mm 82° eyepiece for planetary viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, while 24mm is generally considered a low-to-medium power for planets, it provides excellent initial views of Jupiter, Saturn, and Mars. For more detailed observation, you can pair it with a high-quality \u003cstrong\u003e2X or 3X Focal Extender\u003c\/strong\u003e or Barlow lens. This setup increases the magnification while preserving the eyepiece's comfortable eye relief and wide field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the view change if I use the Explore Scientific 24mm eyepiece with a 2x Barlow on the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWithout a Barlow, the 24mm eyepiece will provide a wide, expansive view of the entire Orion Nebula (M42), including the fainter surrounding nebulosity. Adding a \u003cstrong\u003e2x Barlow\u003c\/strong\u003e will double the magnification, effectively making it a 12mm eyepiece. This will narrow your field of view but allow you to zoom in on the core, easily resolving the four primary stars of the Trapezium (Theta¹ Orionis).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is this Explore Scientific 24mm eyepiece in a 2-inch barrel instead of 1.25-inch?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTo achieve a wide 82° apparent field at a 24mm focal length, a larger field stop is required than what can physically fit inside a 1.25-inch barrel. The \u003cstrong\u003e2-inch barrel format\u003c\/strong\u003e is necessary to prevent vignetting (darkening at the edges of the view) and allow the entire, expansive 82° field to be illuminated.\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\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e8122570146376\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\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Explore_Scientific_Introduction_Booklet_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\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 Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967199801629,"sku":"ES-EPWP8224-01","price":349.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-82-deg-24mm-Waterproof-Eyepiece-EPWP8224-01-1__66199.1594240346.1280.1280.jpg?v=1684338838"},{"product_id":"explore-scientific-82-30mm-waterproof-eyepiece-2","title":"Explore Scientific 82° 30mm Waterproof Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e30mm Focal Length\u003c\/li\u003e\n\u003cli\u003e82° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eWaterproof and Argon-Purged Construction\u003c\/li\u003e\n\u003cli\u003eEnhanced Multilayer Deposition (EMD) Coatings\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 82° 30mm Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 82° 30mm eyepiece delivers an expansive 82° apparent field of view in a rugged, waterproof 2\" barrel. Its 30mm focal length produces low-power, wide-field vistas ideal for framing large deep-sky objects like the North American Nebula (NGC 7000) or the Andromeda Galaxy (M31) in their entirety.\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\u003e82° Apparent Field: A Full-Immersion Experience\u003c\/h3\u003e\n\u003cp\u003eThe 82° apparent field creates a true \"spacewalk\" viewing experience, allowing your eye to relax and take in a vast scene. This immersive view makes it easier to use averted vision, a critical technique for detecting faint details in nebulae and galaxies by looking slightly to the side of the object. Explore Scientific uses combinations of low-dispersion and high-refractive-index glasses with Enhanced Multilayer Deposition (EMD) coatings to ensure high contrast, sharp resolution, and a superior flat field from edge to edge.\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\u003e30mm Focal Length for Rich-Field Observing\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece provides a low-magnification, rich-field perspective perfect for sweeping the Milky Way or locating targets. It excels at observing large globular star clusters like the Hercules Cluster (M13), the full extent of planetary nebulae like the Dumbbell Nebula (M27), and the cloud structure around comets. For higher power, it is fully compatible with Explore Scientific's 2X, 3X, or 5X Focal Extenders, which increase magnification while preserving the eyepiece's generous eye relief and immersive 82° 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\u003eArgon-Purged and Waterproof for All-Weather Reliability\u003c\/h3\u003e\n\u003cp\u003eDesigned for years of field use, each 82° Series eyepiece is hermetically sealed and purged with inert argon gas. This process prevents internal fogging during nights with heavy dew and protects the internal coatings from moisture and fungus. The precision-machined metal barrel and flat-blackened internal surfaces minimize reflections and light scatter, ensuring the highest possible image contrast reaches your eye.\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\"\u003eWhat makes the Explore Scientific 30mm 82° eyepiece \"waterproof\" and \"argon-purged\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe eyepiece is hermetically sealed to prevent moisture from entering, making it waterproof. It is then purged with inert argon gas, which displaces internal, moisture-containing air. This dual protection prevents internal fogging in humid conditions and protects the delicate optical coatings from long-term degradation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 30mm 82° eyepiece good for observing large objects like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. This is an ideal eyepiece for that purpose. Its 30mm focal length provides low magnification and a very wide true field of view, allowing you to fit the entire 3-degree span of the Andromeda Galaxy (M31) and its satellite galaxies M32 and M110 into a single frame in most amateur telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 30mm eyepiece work well in my fast f\/4 Dobsonian telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt will work, but there is a trade-off. In an f\/4 telescope, this 30mm eyepiece produces a very large 7.5mm exit pupil. Since most dark-adapted human pupils only dilate to about 7mm, some of the light gathered by your telescope may be lost. You may also notice the shadow of your telescope's secondary mirror in the center of the view, which is more apparent with large exit pupils. It performs optimally in telescopes of f\/5 or slower.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 82° apparent field of this Explore Scientific eyepiece help with observing faint details?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ultra-wide 82° field creates an immersive, comfortable viewing experience that allows your eye to relax. This makes it easier to observe for longer periods and to use \u003cstrong\u003eaverted vision\u003c\/strong\u003e—looking slightly to the side of a faint object. This technique places the image on a more light-sensitive part of your retina, often making faint details in galaxies and nebulae \"pop\" into view.\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 30mm 82° eyepiece with a focal extender or Barlow lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. This eyepiece is designed to work well with telecentric focal extenders, like the Explore Scientific models. Using a 2X focal extender will effectively turn it into a 15mm eyepiece, doubling the magnification while maintaining the comfortable eye relief and wide 82° apparent field of the original eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of views can I expect with the Explore Scientific 30mm 82° in an 11\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn an 11\" f\/10 SCT, this eyepiece provides 93x magnification and a true field of view of about 0.88 degrees, which is perfect for framing larger deep-sky objects. The resulting 3mm exit pupil is excellent for bringing out detail in bright globular clusters like Omega Centauri, resolving the core of the Orion Nebula (M42), and providing context for planetary nebulae like the Ring Nebula (M57).\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\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e8122570146444\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\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967199834397,"sku":"ES-EPWP8230-01","price":419.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-82-deg-30mm-Waterproof-Eyepiece-EPWP8230-01-1__86975.1594240346.1280.1280.jpg?v=1684338841"},{"product_id":"explore-scientific-100-5-5mm-waterproof-eyepiece-2","title":"Explore Scientific 100° 5.5mm Waterproof Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e5.5mm Focal Length for High-Magnification Views\u003c\/li\u003e\n\u003cli\u003e100° Apparent Field of View for an Immersive Spacewalk Experience\u003c\/li\u003e\n\u003cli\u003e2\" Barrel Format\u003c\/li\u003e\n\u003cli\u003eArgon-Purged and Waterproof for Maximum Durability\u003c\/li\u003e\n\u003cli\u003eFully Multi-Coated and Edge-Blackened Optics for High Contrast\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\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 100° 5.5mm Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 100° 5.5mm Waterproof Eyepiece delivers high-magnification views in a 2-inch barrel format, ideal for resolving fine detail on planets and compact deep-sky objects. Its immersive 100° apparent field of view creates a \"spacewalk\" effect, making objects easy to locate and track. Built for demanding field conditions, each eyepiece is argon-purged and tested to be waterproof for 30 minutes at a depth of 1 meter, ensuring a lifetime of reliable use.\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 5.5mm View: A 100° High-Magnification Spacewalk\u003c\/h3\u003e\n\u003cp\u003eWith a 5.5mm focal length, this eyepiece provides significant power for splitting tight double stars, resolving planetary details like Jupiter's cloud belts, and examining the cores of globular clusters. The expansive 100° apparent field transforms this high-power view into a panoramic experience, framing the object in a wide expanse of black sky that makes you feel as if you're looking through a porthole in space.\u003c\/p\u003e\n\u003cp\u003eTo ensure maximum contrast, all optical elements are fully multi-coated and edge-blackened. This suppresses internal reflections and scattered light, allowing the faintest details to stand out against a dark background, which is critical when pushing magnification to its limits.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBuilt for the Field: Waterproof to 1 Meter and Argon-Purged\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece is engineered to withstand the harshest observing environments. The optical housing is sealed and purged with dry argon gas, an inert element that prevents internal fogging during rapid temperature drops and stops mold or fungus from forming on the internal lens surfaces. This process maximizes the lifespan of the delicate optical coatings.\u003c\/p\u003e\n\u003cp\u003eEvery eyepiece in the 100° series is rigorously tested by submerging it in 1 meter of water for 30 minutes. Whether you observe in a dew-soaked field or a humid climate, you can be confident that your eyepiece is protected from the elements, night after night.\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\u003eObserving with 100°: Extended Tracking and Averted Vision\u003c\/h3\u003e\n\u003cp\u003eThe hyper-wide 100° field offers practical advantages beyond aesthetics. For observers using non-driven telescopes like Dobsonians, an object will drift across the field of view for a very long time before the telescope needs to be nudged. This allows for more relaxed, extended study of your target at high power.\u003c\/p\u003e\n\u003cp\u003eThis wide expanse also enhances the use of averted vision, a critical technique for observing faint objects. The generous field gives your eye ample room to look slightly to the side of a target like the Veil Nebula (NGC 6960), placing its faint light on the more sensitive part of your retina and making subtle details pop into 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\u003e100° vs. 82° Fields: What You Gain with a Hyper-Wide Eyepiece\u003c\/h3\u003e\n\u003cp\u003eWhile 82° eyepieces are a significant step up from standard designs, the jump to a 100° field provides a distinctly more immersive view. An 82° eyepiece can feel like looking at a large screen, whereas a 100° eyepiece fills your peripheral vision, largely removing the boundary of the field stop from your consciousness.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSituational Awareness:\u003c\/strong\u003e The wider field of the 100° design makes it easier to star-hop and locate challenging targets at high magnification, as you can see more of the surrounding star patterns for context.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFraming Large Objects:\u003c\/strong\u003e Even at the high power of 5.5mm, the 100° field allows you to better frame larger targets, such as the full disc of the moon or the Orion Nebula (M42), without feeling constrained by the edges of the view.\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 5.5mm focal length of the Explore Scientific 100° 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 a typical 8\" f\/10 SCT (2032mm focal length), the 5.5mm eyepiece yields a high magnification of 369x. This is an excellent power for resolving fine details in Jupiter's cloud bands, the Great Red Spot, and shadow transits of its moons, provided the atmospheric seeing is stable. The 100° field will frame the planet in a vast blackness, making the view feel incredibly immersive.\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 100° field on a Dobsonian when viewing the Ring Nebula (M57)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary benefit is extended viewing time. M57 is a small target that requires high magnification, causing it to drift quickly through the field of view in a non-tracking Dobsonian. The huge 100° field of the Explore Scientific 5.5mm eyepiece means you can observe for a much longer period before needing to nudge the telescope, allowing for more relaxed and detailed study.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the Explore Scientific 5.5mm eyepiece argon-purged and waterproof?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis construction method ensures maximum durability and longevity. \u003cstrong\u003eArgon purging\u003c\/strong\u003e prevents internal fogging in damp conditions and protects the lens coatings from degradation over time. The \u003cstrong\u003ewaterproof\u003c\/strong\u003e seal (tested to 1 meter for 30 minutes) protects the eyepiece from dew, rain, and accidental immersion, making it a reliable tool for any observing environment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 2-inch barrel of this 5.5mm eyepiece work in my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis eyepiece requires a telescope with a 2-inch focuser or a 2-inch diagonal. It will not fit in a standard 1.25-inch focuser. Most Schmidt-Cassegrains, larger refractors, and Dobsonian telescopes are equipped with 2-inch focusers and can accept this eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 100° field help with observing faint details using averted vision?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAverted vision requires you to look slightly away from your target to place its image on the more light-sensitive peripheral parts of your retina. The Explore Scientific 100° eyepiece provides a massive amount of surrounding sky, giving you plenty of \"empty space\" to focus on while keeping the faint object in your field of view, making the technique easier and more effective.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 100° 5.5mm eyepiece heavy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eHyper-wide eyepieces like this contain large, complex glass elements and are generally heavier than simpler designs like Plössls or Orthoscopics. While the exact weight is not specified, you should be prepared to rebalance your telescope, especially smaller models, when switching to or from this eyepiece to ensure smooth and stable tracking.\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\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257014934\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\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":44967199867165,"sku":"ES-EPWP10055-01","price":419.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-100-deg-5-5mm-Waterproof-Eyepiece-EPWP10055-01-1__51525.1594240347.1280.1280.jpg?v=1684338724"},{"product_id":"explore-scientific-100-14mm-waterproof-eyepiece-2","title":"Explore Scientific 100° 14mm Waterproof Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e14mm Focal Length\u003c\/li\u003e\n\u003cli\u003e100° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eArgon-Purged and Waterproof Construction\u003c\/li\u003e\n\u003cli\u003eFully Multi-Coated and Edge-Blackened Optics\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 100° 14mm Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 100° 14mm Waterproof Eyepiece delivers an immense 100° apparent field of view in a rugged, 2-inch barrel design for a true \"spacewalk\" experience. Its 14mm focal length provides high-power, wide-field views of planets and compact deep-sky objects, while its argon-purged body is certified waterproof after being submerged for 30 minutes at a depth of 1 meter.\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 100° Apparent Field of View Experience\u003c\/h3\u003e\n\u003cp\u003eWith an apparent field of view of 100°, this eyepiece creates a panoramic window on the universe that can make you forget you're looking through a telescope. This vast expanse makes finding targets easier and keeps them in the field of view far longer in non-tracking telescopes like Dobsonians.\u003c\/p\u003e\n\u003cp\u003eThe immersive view also relaxes your eye, allowing you to use averted vision more effectively to detect faint details in nebulae and galaxies. By looking slightly to the side of an object, you place its light on a more sensitive part of your retina, revealing structures that are invisible to direct sight.\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\u003eArgon-Purged and Waterproof to 1 Meter\u003c\/h3\u003e\n\u003cp\u003eDesigned for durability in any climate, each Explore Scientific 100° eyepiece is internally sealed and purged with inert argon gas. This process prevents internal fogging during damp nights and protects the delicate internal coatings from moisture, fungus, and degradation over the life of the eyepiece.\u003c\/p\u003e\n\u003cp\u003eThis robust construction is tested to withstand being submerged in 1 meter of water for 30 minutes. Whether you observe in a humid coastal area or simply want the peace of mind that comes with environmentally-sealed optics, this eyepiece is built to last.\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\u003eFully Multi-Coated for Maximum Contrast\u003c\/h3\u003e\n\u003cp\u003eTo ensure the panoramic view is as sharp and contrasty as it is wide, all optical surfaces are fully multi-coated, and lens edges are blackened. This treatment dramatically reduces internal reflections and light scatter, which would otherwise reduce image brightness and wash out faint details.\u003c\/p\u003e\n\u003cp\u003eThe result is a dark, inky-black sky background that makes stars appear as sharp points and allows the subtle wisps of nebulae and distant galaxies to stand out. The high light throughput is critical for resolving fine detail on planetary surfaces and splitting tight double stars.\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 100° 14mm vs. Tele Vue Ethos 13mm: Field and Value\u003c\/h3\u003e\n\u003cp\u003eThe primary competitor for the Explore Scientific 14mm is the Tele Vue Ethos 13mm. While the Ethos is often considered the benchmark for edge-of-field correction in very fast (f\/4) telescopes, the Explore Scientific 100° series presents a compelling alternative.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompetitor's Advantage:\u003c\/strong\u003e The Tele Vue Ethos line is renowned for its exceptional optical correction, delivering pinpoint stars across the entire field even in the most demanding fast reflectors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis Eyepiece's Advantage:\u003c\/strong\u003e The Explore Scientific 14mm eyepiece provides the same immersive 100° field of view but adds the significant, practical benefit of being fully argon-purged and waterproof. For observers in challenging climates, this environmental sealing is a decisive feature.\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 100° 14mm eyepiece perform on globular clusters like M13 in an f\/10 SCT?\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, the 14mm focal length yields approximately 145x magnification. This is an excellent power for resolving the dense cores of globular clusters like the Hercules Cluster (M13), and the 100° field will frame the cluster beautifully against a dark background, showing its full extent and surrounding star field.\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 Explore Scientific 100° 14mm being argon-purged and waterproof?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is durability and longevity. \u003cstrong\u003eArgon purging\u003c\/strong\u003e prevents internal fogging on humid nights and stops moisture from degrading the internal optical coatings over time. Being \u003cstrong\u003ewaterproof\u003c\/strong\u003e means you can observe in dewy conditions without worry and clean the eyepiece more thoroughly without risk of internal damage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need a coma corrector with the Explore Scientific 100° 14mm eyepiece in a fast f\/4 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is highly recommended. While the eyepiece is well-corrected, any fast Newtonian reflector (f\/5 or faster) exhibits significant coma, which distorts stars at the edge of the field into seagull shapes. A high-quality coma corrector, like a Tele Vue Paracorr Type 2, is essential to achieve sharp stars across the full 100° field of this eyepiece in an f\/4 system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 100° field of the Explore Scientific 14mm eyepiece help with non-driven telescopes?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe extremely wide 100° apparent field of view results in a much larger true field of view at the telescope. This means that as the Earth rotates, a celestial object will take significantly longer to drift across the eyepiece compared to a standard 50° or 60° ocular. This reduces the need for constant nudging of the telescope, allowing for more relaxed, extended observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 100° 14mm eyepiece suitable for observers who wear glasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is a trade-off. Hyper-wide eyepieces like the Explore Scientific 100° series often have limited eye relief to achieve their expansive fields. While the exact specification is not provided, observers with significant astigmatism who must wear glasses may not be able to see the full 100° field of view. Most users observe with their glasses off and refocus the telescope to compensate for nearsightedness or farsightedness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the difference between the Explore Scientific 100° 14mm and the 92° LER series?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe main difference is a design choice between field of view and eye relief. The \u003cstrong\u003e100° series\u003c\/strong\u003e maximizes the apparent field of view for the most immersive experience possible. The \u003cstrong\u003e92° LER (Long Eye Relief) series\u003c\/strong\u003e trades a small amount of field width (92° vs 100°) for significantly more eye relief, making them a better choice for eyeglass wearers.\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\u003e14mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e100°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eArgon-Purged, Waterproof\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated, Edge-Blackened\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257014668\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\"\u003e14mm 100° 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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap (Top)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap (Bottom)\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":44967199899933,"sku":"ES-EPWP10014-01","price":489.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-100-deg-14mm-Waterproof-Eyepiece-EPWP10014-01-1__29146.1594240347.1280.1280.jpg?v=1684338728"},{"product_id":"explore-scientific-100-20mm-waterproof-eyepiece-2","title":"Explore Scientific 100° 20mm Waterproof Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eExpansive Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2-inch Diameter Barrel\u003c\/li\u003e\n\u003cli\u003eWaterproof and Fog-Proof Construction\u003c\/li\u003e\n\u003cli\u003eArgon-Purged and Sealed Optical Housing\u003c\/li\u003e\n\u003cli\u003eFully Multi-Coated and Edge-Blackened Optics\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 100° 20mm Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 100° 20mm Waterproof Eyepiece delivers an immense 100° apparent field of view in a 2-inch barrel format. This 20mm eyepiece is engineered to create a panoramic, immersive viewing experience that relaxes the eye, allowing you to study subtle details for extended periods. To ensure maximum durability and contrast, each eyepiece is fully sealed, argon-purged, and tested to be waterproof at a depth of 1 meter for 30 minutes.\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 100° Panoramic Viewing Experience\u003c\/h3\u003e\n\u003cp\u003eWith an apparent field of view of 100°, this eyepiece provides a \"spacewalk\" experience, where the boundary of the eyepiece seems to dissolve. This ultra-wide perspective is not just for dramatic effect; it relaxes your eye, allowing you to comfortably scan large star fields and take in the full context of large deep-sky objects without constantly moving the telescope.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Contrast:\u003c\/strong\u003e The optics are fully multi-coated and edge-blackened to eliminate internal reflections and light scatter, producing a dark sky background and making faint details pop.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelaxed Viewing:\u003c\/strong\u003e The expansive field helps you forget you're looking through an eyepiece, reducing eye strain during long observing sessions of objects like the Veil Nebula complex or the Andromeda Galaxy (M31).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEye Placement:\u003c\/strong\u003e A trade-off of such a wide field is that eye placement can be more critical than in narrow-field designs. You may need to move your eye slightly to take in the extreme edges of the field.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAll-Weather Reliability: Waterproof to 1 Meter\u003c\/h3\u003e\n\u003cp\u003eThe Explore Scientific 100° series eyepieces are built to withstand challenging field conditions. Each unit is hermetically sealed and purged with inert argon gas, which is more effective than nitrogen at preventing internal fogging over a wider temperature range. This process also protects the internal coatings from moisture, fungus, and fine dust, maximizing their lifespan.\u003c\/p\u003e\n\u003cp\u003eTo guarantee this seal, every eyepiece is factory-tested by being submerged in 1 meter of water for 30 minutes. This ensures your investment is protected from unexpected dew, humidity, or even accidental exposure to rain, providing peace of mind for any observing environment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 20mm focal length of the Explore Scientific 100° eyepiece perform on globular clusters like M13 in an f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 8-inch or 11-inch f\/10 Schmidt-Cassegrain Telescope, a 20mm focal length provides medium-to-low magnification (around 100x-140x). This is ideal for framing the entirety of large globular clusters like the Hercules Cluster (M13) or Omega Centauri within the immersive 100° field, showing the cluster against a dark, expansive background.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the 100° field when framing large nebulae like the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary benefit is context. Large emission nebulae often span several degrees of the sky. The ultra-wide 100° field of the Explore Scientific 20mm eyepiece allows you to see these objects in their entirety, especially when paired with a rich-field refractor. You can trace the full \"coastline\" of NGC 7000 or the sprawling arms of the Orion Nebula (M42) in a single view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the Explore Scientific 100° 20mm eyepiece purged with argon instead of nitrogen?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eArgon gas molecules are larger than nitrogen molecules, making them less prone to escaping through the eyepiece's seals over time. This provides a more stable, long-term waterproof and fog-proof solution, ensuring the internal optics remain pristine for the life of the eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 2-inch barrel on the Explore Scientific 100° 20mm necessary for the wide field?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, a 2-inch barrel is essential. The physical diameter of a 1.25-inch barrel would act as a restrictive aperture, making it impossible to deliver such a wide, well-illuminated 100° field of view to the observer's eye without significant vignetting (darkening at the edges).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does it mean that the Explore Scientific 100° 20mm is tested to be waterproof for 30 minutes at 1 meter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is a rigorous durability standard. It means the eyepiece's seals are robust enough to prevent any water intrusion even when fully submerged. For an astronomer, this translates to complete protection against heavy dew, high humidity, and accidental splashes or rain, preventing internal fogging or damage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need to move my head around to see the whole 100° field in the Explore Scientific 20mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor some observers, yes. Achieving a comfortable view of the entire 100° field at once can depend on your individual eye placement and whether you wear glasses. It is common with ultra-wide eyepieces to slightly shift your eye position to fully appreciate details at the very edge of the field stop.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\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":44967199932701,"sku":"ES-EPWP10020-01","price":699.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-100-deg-20mm-Waterproof-Eyepiece-EPWP10020-00-1__73534.1594240348.1280.1280.jpg?v=1684338732"},{"product_id":"explore-scientific-100-9mm-waterproof-eyepiece-2","title":"Explore Scientific 100° 9mm Waterproof Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e9mm Focal Length\u003c\/li\u003e\n\u003cli\u003e100° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eArgon-Purged Waterproof Construction\u003c\/li\u003e\n\u003cli\u003eFully Multi-Coated Optics\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 100° 9mm Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 100° 9mm Waterproof Eyepiece combines a high-power 9mm focal length with an immense 100° apparent field of view in a 2-inch barrel format. This design is fully sealed and argon-purged, tested to be waterproof for 30 minutes at a depth of 1 meter, ensuring maximum life for the internal coatings.\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 100° View: High-Contrast Immersion\u003c\/h3\u003e\n\u003cp\u003eWith a 100° apparent field, the barrier between you and the universe seems to dissolve. The 9mm focal length provides the high magnification needed for resolving globular clusters, planetary nebulae, and fine detail on the Moon and planets. Instead of a narrow \"keyhole\" view, targets appear suspended in a vast, black field, making them easier to locate and observe for extended periods.\u003c\/p\u003e\n\u003cp\u003eThis panoramic view also enhances the use of averted vision for detecting faint details. To maintain image clarity across this huge field, all optical elements are fully multi-coated and edge-blackened. This maximizes light transmission and eliminates internal reflections, producing a sharp, high-contrast image from edge to edge.\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 30-Minute, 1-Meter Waterproof Seal\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece is engineered to withstand challenging field conditions. The optical housing is hermetically sealed and purged with inert argon gas. This process prevents internal fogging during nights with heavy dew and stops contaminants like dust, pollen, or fungus from ever reaching the internal lens surfaces.\u003c\/p\u003e\n\u003cp\u003eEach eyepiece is factory-tested by being submerged in 1 meter of water for 30 minutes to guarantee its integrity. This robust construction not only protects your investment from the elements but also preserves the delicate optical coatings for a lifetime of use.\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 100° 9mm vs. Tele Vue Ethos: The Spacewalk Experience\u003c\/h3\u003e\n\u003cp\u003eWhile the Tele Vue Ethos line pioneered the 100° \"spacewalk\" experience, the Explore Scientific 100° series delivers that same profound sense of immersion. Both eyepiece families provide the massive field of view that allows non-driven telescopes to keep objects in view for much longer, relaxing the eye for detailed observation.\u003c\/p\u003e\n\u003cp\u003eThe primary distinction lies in the Explore Scientific's sealed and waterproof construction. For observers in dew-prone climates, the argon-purged housing of the ES 100° 9mm offers a practical advantage in reliability and longevity that other hyper-wide eyepieces do not match.\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 ES 9mm 100° eyepiece perform on Jupiter with an 8\" Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 8\" f\/6 Dobsonian (1200mm focal length), the 9mm eyepiece yields 133x magnification. This is an excellent power for viewing Jupiter's main cloud belts, the Great Red Spot, and the Galilean moons. The 100° field means you can watch the planet drift for a long time before needing to nudge the telescope, making for a very comfortable and immersive observing session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 9mm focal length good for viewing the Ring Nebula (M57) in a 10\" f\/5 scope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's a great choice. In a 10\" f\/5 Newtonian (1270mm focal length), the 9mm eyepiece provides 141x magnification. This is high enough to clearly resolve the \"donut\" shape of the Ring Nebula (M57) and potentially glimpse the faint central star. The wide 100° field will frame the nebula beautifully against a dark, expansive background.\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 100° field of view on the ES 9mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary benefit is the immersive, \"spacewalk\" feeling it creates. It also makes finding and tracking objects much easier, especially with non-motorized telescopes like Dobsonians. Objects stay in the field of view for a significantly longer time compared to standard eyepieces, allowing you to relax and study details without constant adjustments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is an argon-purged, waterproof eyepiece like the ES 9mm 100° useful?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn argon-purged and sealed eyepiece is protected from the environment. Key benefits include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo Internal Fogging:\u003c\/strong\u003e It will not fog up internally during nights with heavy dew.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContaminant-Free:\u003c\/strong\u003e Dust, moisture, and fungus cannot get inside the eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLongevity:\u003c\/strong\u003e The internal lens coatings are protected, ensuring a longer lifespan for the eyepiece.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a 2\" focuser to use the Explore Scientific 9mm 100° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. This eyepiece has a 2-inch barrel and requires a telescope with a 2-inch focuser. It cannot be used with telescopes that only accept 1.25-inch eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need a coma corrector with this 9mm eyepiece in my fast Newtonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn fast telescopes (f\/5 or lower), hyper-wide eyepieces like the ES 100° 9mm will show coma, an aberration that makes stars near the edge of the field appear comet-shaped. While still usable, pairing it with a good coma corrector like the Tele Vue Paracorr Type 2 will provide much sharper stars across the entire 100° field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e9mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e100°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWaterproofing\u003c\/td\u003e\n\u003ctd\u003eYes, Argon-Purged (Tested to 1 meter for 30 minutes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Edges\u003c\/td\u003e\n\u003ctd\u003eBlackened\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257014651\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\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967199965469,"sku":"ES-EPWP1009-01","price":419.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-100-deg-9mm-Waterproof-Eyepiece-EPWP1009-01-1__86753.1594240348.1280.1280.jpg?v=1684338735"},{"product_id":"explore-scientific-100-25mm-waterproof-eyepiece-2","title":"Explore Scientific 100° 25mm Waterproof Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e100° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e25mm Focal Length\u003c\/li\u003e\n\u003cli\u003e2\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eWaterproof and Argon-Purged Construction\u003c\/li\u003e\n\u003cli\u003eFully Multi-Coated and Edge-Blackened Optics\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 100° 25mm Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 100° 25mm Waterproof Eyepiece delivers an immense 100° apparent field of view in a 2-inch barrel format. This 25mm focal length provides low-power, panoramic views that fundamentally alter the visual experience, nearly doubling the perceived sky compared to standard eyepiece designs and creating a true \"spacewalk\" feeling.\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 100° Spacewalk Experience at 25mm\u003c\/h3\u003e\n\u003cp\u003eWith an apparent field so vast, the boundary of the eyepiece seems to dissolve, leaving you suspended in space. This 100° field makes locating objects effortless and allows them to drift through the view for long periods in non-driven telescopes like Dobsonians, minimizing the need for constant adjustments. This expansive view also enhances the use of averted vision, making it easier to detect faint details in nebulae and galaxies by placing them on the more light-sensitive parts of your retina.\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\u003eArgon-Purged and Waterproof to 1 Meter\u003c\/h3\u003e\n\u003cp\u003eEngineered for durability in all observing conditions, each eyepiece is internally sealed and purged with dry argon gas. This inert gas prevents internal fogging during nights with heavy dew and protects the internal multi-coatings from moisture-induced degradation over the eyepiece's lifetime. To ensure field-readiness, every eyepiece is tested for integrity by being submerged in 1 meter of water for 30 minutes, guaranteeing a completely waterproof seal against the elements.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Contrast:\u003c\/strong\u003e All internal lens elements are fully multi-coated and edge-blackened to eliminate stray light, ensuring a dark background sky and maximizing image contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDew-Proof Operation:\u003c\/strong\u003e The sealed optical train means you can move from a warm house to a cold outdoor environment without worrying about condensation forming between the lenses.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e100° vs. 50° AFOV: Framing the Orion Nebula (M42)\u003c\/h3\u003e\n\u003cp\u003eWhile a standard 25mm eyepiece with a 50° field provides a sharp, useful view, its limitations become apparent on large targets. A typical 50° eyepiece might frame the core of the Orion Nebula (M42), showing the Trapezium stars clearly, but the sprawling outer wings of the nebula are cut off. The trade-off for this narrower view is typically lower cost and lighter weight.\u003c\/p\u003e\n\u003cp\u003eIn contrast, the Explore Scientific 100° 25mm eyepiece, at the exact same magnification, contains the entire M42 complex in a single, immersive view. You see the Trapezium, the intricate gas clouds, and the faint outer loops all at once, set against a vast backdrop of surrounding stars. For large objects like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000), this capability is not just an incremental improvement; it's a completely different way of observing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Explore Scientific 25mm 100° eyepiece perform in a 10\" f\/4.7 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt's an excellent match. The 25mm focal length provides low magnification, ideal for sweeping large areas of the Milky Way. In a 10\" f\/4.7 Dobsonian, the immense 100° field means you can nudge the telescope to track objects far less frequently, letting you study faint details for longer without interruption.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I see the entire Andromeda Galaxy (M31) with the Explore Scientific 25mm 100° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, in most amateur telescopes, this eyepiece is capable of framing the entire visual extent of the Andromeda Galaxy (M31) and its satellite galaxies M32 and M110 in a single field of view. Its low power and ultra-wide field are perfectly suited for observing such large galactic structures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is an argon-purged eyepiece like the Explore Scientific 25mm 100° better than a non-sealed one?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eArgon purging makes the eyepiece weatherproof.\u003c\/strong\u003e It prevents internal fogging when moving from warm to cold environments and stops moisture, fungus, and dust from getting inside the eyepiece over its lifetime. This preserves the optical coatings and ensures consistent, high-contrast views for years, especially in humid climates.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 25mm 100° eyepiece heavy? Will I need to rebalance my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUltra-wide eyepieces with large glass elements are significantly heavier than standard Plössl or Kellner designs. When switching to the Explore Scientific 25mm 100° from a smaller 1.25\" eyepiece, you will almost certainly need to rebalance your telescope, particularly on Dobsonians or German equatorial mounts with sensitive balance points.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the 100° field on the Explore Scientific 25mm eyepiece for lunar observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile often considered a deep-sky eyepiece, the 100° field provides a stunning \"porthole in space\" view of the entire lunar disc with plenty of black sky around it. This context makes the Moon appear as a three-dimensional sphere hanging in space, an effect that is difficult to achieve with narrower field eyepieces that frame the Moon tightly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre filters compatible with the Explore Scientific 25mm 100° 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 (M48x0.75) astronomy filters. This allows you to use nebula filters like UHC or O-III to enhance contrast on deep-sky 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\u003e25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e100°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWaterproof Rating\u003c\/td\u003e\n\u003ctd\u003eSubmersible to 1 meter for 30 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGas Purge\u003c\/td\u003e\n\u003ctd\u003eArgon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Edges\u003c\/td\u003e\n\u003ctd\u003eBlackened\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257013852\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":44967200031005,"sku":"ES-EPWP10025-01","price":1259.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-100-deg-25mm-Waterproof-Eyepiece-EPWP10025-01-1__75459.1594240348.1280.1280.jpg?v=1684338739"},{"product_id":"explore-scientific-100-30mm-waterproof-eyepiece-3","title":"Explore Scientific 100° 30mm Waterproof Eyepiece - 3\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e30mm Focal Length\u003c\/li\u003e\n\u003cli\u003e100° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e3\" Diameter Barrel\u003c\/li\u003e\n\u003cli\u003eArgon-Purged Waterproof Construction\u003c\/li\u003e\n\u003cli\u003eFully Multi-Coated and Edge-Blackened Optics\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 100° 30mm Waterproof Eyepiece - 3\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 100° 30mm eyepiece delivers a hyper-wide field of view in a massive 3\" barrel format, creating a panoramic window into the universe. This 30mm ocular is fully waterproof, tested by submersion in 1 meter of water for 30 minutes to ensure its argon-purged interior remains pristine. The expansive 100° apparent field of view feels less like looking through an eyepiece and more like a true spacewalk experience.\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 100° Panoramic Experience in a 30mm Eyepiece\u003c\/h3\u003e\n\u003cp\u003eWith a 100° apparent field, the boundary of the eyepiece seems to dissolve, leaving you with an unrestricted, inky-black vista. This immense field makes it easier to locate targets and is a significant advantage for users of non-driven telescopes, such as large Dobsonians. Objects drift through the field of view for an extended time before your telescope needs repositioning.\u003c\/p\u003e\n\u003cp\u003eThis wide-field presentation also makes it easier to use averted vision. By looking slightly to the side of a faint galaxy or nebula, you place the image on a more light-sensitive part of your retina. The relaxed, panoramic view of the 30mm 100° eyepiece makes this technique feel natural, helping you perceive subtle details in faint deep-sky objects.\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 3\" Barrel for Unrestricted Low-Power Views\u003c\/h3\u003e\n\u003cp\u003eTo achieve a true 100° field of view at a 30mm focal length, a standard 2-inch barrel is not large enough to accommodate the necessary optics without introducing significant vignetting. The Explore Scientific 100° 30mm eyepiece solves this by moving to a 3-inch barrel, allowing for larger lens elements and an optical design that is fully illuminated to the edge of the field.\u003c\/p\u003e\n\u003cp\u003eThis design choice is critical for providing the lowest-power, widest possible true field of view in large telescopes. The result is maximum light throughput and a panoramic view that simply cannot be replicated in a smaller barrel format at this focal length. All optical elements are fully multi-coated and edge-blackened to ensure the highest possible contrast.\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\u003eArgon-Purged: Waterproof to 1 Meter\u003c\/h3\u003e\n\u003cp\u003eEach eyepiece in the 100° series is built to withstand harsh observing conditions. The optical housing is internally sealed and purged with inert argon gas, which prevents the formation of internal fogging during nights with heavy dew or rapid temperature changes. This process also protects the delicate internal coatings from moisture, maximizing their lifespan.\u003c\/p\u003e\n\u003cp\u003eTo guarantee this seal, every eyepiece is factory-tested by being submerged in 1 meter of water for 30 minutes. This rugged construction ensures your investment is protected from the elements, delivering consistent, high-contrast views every time you observe.\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 30mm 100° vs. 2-Inch Wide-Field Eyepieces\u003c\/h3\u003e\n\u003cp\u003eWhile legendary 2-inch eyepieces provide expansive views, the 3-inch format of the ES 30mm 100° pushes the physical limits of what's possible for low-power viewing.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. TeleVue 31mm Nagler:\u003c\/strong\u003e The 31mm Nagler is a benchmark for wide-field viewing in a 2-inch barrel, offering a superb 82° field. The ES 30mm 100°, by utilizing a 3-inch barrel, expands the apparent field to a full 100°, creating a more immersive, \"spacewalk\" sensation at a nearly identical focal length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrade-offs:\u003c\/strong\u003e The primary advantage of the 3-inch format is the wider, unvignetted field at long focal lengths. The trade-off is the requirement for a 3-inch focuser and the eyepiece's considerable size and weight, which may require counterbalancing on some telescopes.\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 kind of telescope requires the Explore Scientific 30mm 100° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis eyepiece is designed for large telescopes equipped with a \u003cstrong\u003e3-inch focuser\u003c\/strong\u003e. It is an ideal \"finder\" and low-power scanning eyepiece for large Dobsonian reflectors and high-end refractors, where its massive field of view can be fully appreciated for sweeping the Milky Way or framing large objects like the Andromeda Galaxy (M31).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the Explore Scientific 30mm 100° eyepiece have a 3-inch barrel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA standard 2-inch barrel is physically too small to pass the large cone of light required for a \u003cstrong\u003e30mm focal length\u003c\/strong\u003e and a \u003cstrong\u003e100° apparent field of view\u003c\/strong\u003e without darkening the edges (vignetting). The 3-inch barrel allows for larger internal lens elements, ensuring the entire field is bright and fully illuminated.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 100° field of view on the ES 30mm eyepiece help with finding faint objects?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe vast field of view makes it easier to use \u003cstrong\u003eaverted vision\u003c\/strong\u003e, a technique where you look slightly to the side of a faint object. This places the image on a more light-sensitive part of your eye. The relaxed, panoramic view of the ES 30mm makes this feel very natural, helping you detect faint details in galaxies and nebulae that are invisible with direct vision.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 30mm 100° eyepiece heavy? Will it balance on my Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, as a large 3-inch eyepiece, it has significant mass. You will likely need to add \u003cstrong\u003ecounterweights\u003c\/strong\u003e to your telescope, especially on a Dobsonian, to maintain proper balance. This is a necessary trade-off for the unparalleled wide-field views it provides.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat would the view of the Andromeda Galaxy (M31) be like through this ES 30mm 100° eyepiece in a 16-inch f\/4.5 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a 16-inch (1829mm focal length) Dobsonian, the ES 30mm eyepiece would provide 61x magnification and an exceptionally wide true field of view. You would be able to frame the entire core and sprawling spiral arms of the Andromeda Galaxy (M31) in a single view, along with its companion galaxies M32 and M110, all set against a dark, panoramic backdrop.\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 30mm 100° eyepiece on my 8\" SCT for objects like the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOnly if your 8\" SCT has been retrofitted with a 3-inch focuser, which is not standard. If it has, this eyepiece would offer the widest possible field of view your telescope can deliver, framing the entire Orion Nebula (M42) complex, from the Trapezium cluster out to the faintest wisps of nebulosity, in a stunning single field.\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\u003e30mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e100°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e3\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eYes, tested at 1 meter for 30 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGas Purge\u003c\/td\u003e\n\u003ctd\u003eArgon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEdge Blackening\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257013869\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\"\u003eExplore Scientific 100° 30mm Waterproof Eyepiece - 3\"\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":44967200063773,"sku":"ES-EPWP10030-01","price":1763.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-100-deg-3-inch-30mm-Waterproof-Eyepiece-EPWP10030-01-1__58126.1594240349.1280.1280.jpg?v=1684338742"},{"product_id":"explore-scientific-120-9mm-waterproof-eyepiece-2","title":"Explore Scientific 120° 9mm Waterproof Eyepiece -2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e9mm Focal Length\u003c\/li\u003e\n\u003cli\u003e120° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2-Inch Diameter Barrel\u003c\/li\u003e\n\u003cli\u003eArgon-Purged Waterproof Construction\u003c\/li\u003e\n\u003cli\u003eIdeal for Non-Driven Telescopes\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 120° 9mm Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 9mm 120° Waterproof Eyepiece delivers an apparent field of view so vast it eliminates the sensation of looking through an instrument. With a 9mm focal length providing high magnification in its 2-inch barrel, this eyepiece frames celestial objects in a 120° starfield that feels less like an observation and more like a direct spacewalk.\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 120° Spacewalk at 9mm Focal Length\u003c\/h3\u003e\n\u003cp\u003eUnlike typical wide-field eyepieces that deliver low-power views, the 9mm focal length brings you \"close up and personal\" to targets while maintaining an impossibly wide context. The 120° apparent field is so expansive that the field stop effectively vanishes, creating a fully immersive view where objects like the Orion Nebula (M42) or the Hercules Cluster (M13) are not just seen, but experienced.\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 120° Advantage for Non-Tracking Mounts\u003c\/h3\u003e\n\u003cp\u003eFor observers using non-driven telescopes like Dobsonians, the 120° field is a functional game-changer. At the high magnifications delivered by a 9mm eyepiece, objects normally drift out of view in seconds. This eyepiece's immense field allows targets to remain visible for significantly longer, minimizing the need to constantly nudge the telescope and allowing for more relaxed, sustained observation.\u003c\/p\u003e\n\u003cp\u003eThis wide expanse also enhances the use of averted vision. You have ample room to look slightly away from a faint galaxy or nebula to place its light on the more sensitive part of your retina, causing it to pop into view without ever losing the object from 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\u003e2-Inch Barrel Durability: Argon-Purged and Waterproof\u003c\/h3\u003e\n\u003cp\u003eThe robust 2-inch barrel houses optics protected from the elements. The eyepiece is fully waterproof and purged with inert argon gas, which prevents internal fogging during temperature drops and protects delicate coatings from moisture and fungus over the life of the instrument. This all-weather construction ensures your view remains clear and the eyepiece performs reliably, even on nights with heavy dew.\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 120° vs. 82° Ultra-Wides: Beyond the Field Stop\u003c\/h3\u003e\n\u003cp\u003eWhile 82° ultra-wide eyepieces are a respected standard for immersive views, the 120° field of this Explore Scientific eyepiece offers a fundamentally different experience. It's not just a quantitative increase in field of view; it's a qualitative leap in immersion.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e82° Eyepieces:\u003c\/strong\u003e These designs provide a fantastic \"picture window\" on the universe. They are often lighter, more compact, and can be more forgiving on telescopes with minor optical aberrations. The field edge is clearly defined.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific 120°:\u003c\/strong\u003e The primary advantage is the \"spacewalk\" effect. The field is so large your eye cannot take it all in at once, and the boundary between the view and your peripheral vision dissolves. For Dobsonian users, this extra 38° of sky provides even more drift time, making manual tracking at high power feel effortless.\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 9mm 120° eyepiece perform on planetary targets like Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis eyepiece provides a unique planetary viewing experience. The 9mm focal length yields high magnification suitable for resolving cloud bands on Jupiter or the Cassini Division in Saturn's rings. The 120° field means you can watch the planet and its moons drift across an enormous black background, giving a sense of scale that narrower eyepieces cannot match.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need a coma corrector with the 9mm 120° eyepiece in my f\/4.5 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is highly recommended. Fast telescopes (f\/5 and below) inherently produce coma, an aberration that distorts stars at the edge of the field into comet-like shapes. A 120° eyepiece will make this effect very apparent. Using a high-quality coma corrector will ensure stars remain sharp across the entire vast field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"Argon-Purged\" mean for this Explore Scientific 120° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eArgon purging\u003c\/strong\u003e is a process where the air inside the eyepiece is replaced with dry, inert argon gas. This has two main benefits:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIt prevents internal optics from fogging when moving the eyepiece from a warm house to a cold outdoor environment.\u003c\/li\u003e\n\u003cli\u003eIt protects the internal lens surfaces and coatings from long-term degradation caused by moisture, mold, or oxidation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 9mm 120° eyepiece too heavy for my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eEyepieces with extreme fields of view like this one contain large, heavy glass elements. While the exact weight isn't specified, it will be substantial. You should ensure your focuser can handle the load without slipping and be prepared to add counterweights to your telescope, especially on German Equatorial Mounts or Dobsonians, to maintain proper balance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow is the 120° field of this eyepiece different from an 82° or 100° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile 82° and 100° eyepieces are considered immersive, the 120° field crosses a perceptual threshold. At 82°, you are aware of the field stop. At 100°, it's less intrusive. At 120°, the field stop effectively disappears from your conscious view, creating the signature \"spacewalk\" feeling where you are no longer looking through an instrument but are seemingly suspended in space.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is a 2-inch barrel necessary for the Explore Scientific 9mm 120° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA 2-inch barrel is required to physically accommodate the large lens elements needed to produce a 120° apparent field of view. A smaller 1.25-inch barrel would act as a bottleneck, vignetting the view and making it impossible to illuminate such a massive field.\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\u003e9mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e120°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eArgon-Purged, Waterproof\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257013876\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":44967200096541,"sku":"ES-EPWP12009-01","price":1259.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-120-deg-9mm-Waterproof-Eyepiece-EPWP12009-01-1__69377.1594240349.1280.1280.jpg?v=1684338745"},{"product_id":"explore-scientific-52-3mm-waterproof-eyepiece-1-25","title":"Explore Scientific 52° 3mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e3mm Focal Length for High-Power Observing\u003c\/li\u003e\n\u003cli\u003e52° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eFully Waterproof and Argon-Purged\u003c\/li\u003e\n\u003cli\u003eEnhanced Multi-Layer Deposition (EMD) Coatings\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 52° 3mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 52° 3mm eyepiece is a specialized optical tool designed for high-magnification planetary and double-star observation. Its 3mm focal length delivers extreme power in most telescopes, while the 52° apparent field provides a classic, sharp window for on-axis viewing, all housed in a rugged, waterproof 1.25\" body.\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-Power Planetary Viewing: The 3mm Focal Length\u003c\/h3\u003e\n\u003cp\u003eWith a 3mm focal length, this eyepiece is built to push your telescope to its magnification limit on nights of steady seeing. In short-focal-length refractors, it provides the high power needed to resolve fine details on Jupiter's cloud bands or Saturn's rings. In larger instruments like Schmidt-Cassegrains or large Dobsonians, it achieves the magnifications required to split challenging double stars and examine the cores of bright globular clusters like M13.\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\u003eContrast-Optimized Optics: 52° Field with EMD Coatings\u003c\/h3\u003e\n\u003cp\u003eThe 52° apparent field of view is a deliberate design choice that prioritizes on-axis sharpness and contrast over an ultra-wide, immersive experience. This focused view is ideal for planetary work, where detecting subtle color variations and low-contrast details is critical. The optical system is fully EMD (Enhanced Multi-Layer Deposition) Coated with edge-blackened lenses to minimize internal reflections and maximize light transmission, ensuring a dark background sky and bright, crisp images.\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\u003eAll-Weather Reliability: Argon-Purged Waterproof Construction\u003c\/h3\u003e\n\u003cp\u003eAn inert argon-gas purge makes the eyepiece completely waterproof, preventing internal fogging when moving from a warm environment to cold outdoor conditions. This hermetic seal also protects the delicate internal coatings from moisture, fungus, and dust, ensuring the eyepiece maintains its optical integrity for years of use. This rugged construction makes it a reliable choice for observers in humid climates or those who frequently encounter dewing 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\u003eES 52° vs. Wider Field Eyepieces: A Focused Approach\u003c\/h3\u003e\n\u003cp\u003eWhile wider 68°, 82°, or 100° eyepieces offer a breathtaking \"spacewalk\" feeling, they achieve it with more complex optical designs that can sometimes compromise central sharpness and contrast. The Explore Scientific 52° 3mm eyepiece takes a different approach.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOn-Axis Priority:\u003c\/strong\u003e The simpler optical formula is optimized for the highest possible contrast and resolution at the center of the field, which is exactly where you place a planet or tight double star.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComfort and Simplicity:\u003c\/strong\u003e The 52° field is comfortable and easy to take in, without the need to pan your eye around to see the edges. It's a classic design for a reason, favored by planetary observers who value optical purity above all else.\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 Explore Scientific 3mm 52° eyepiece best for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Explore Scientific 3mm 52° eyepiece excels at \u003cstrong\u003ehigh-magnification observation\u003c\/strong\u003e of bright, small targets. Its primary uses are for detailed views of planets like Jupiter, Saturn, and Mars, splitting close binary stars, and examining the cores of planetary nebulae and bright globular clusters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Explore Scientific 3mm 52° perform in my 8\" f\/10 SCT?\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, this 3mm eyepiece will produce extremely high magnification. This level of power is useful only on nights with \u003cstrong\u003every steady atmospheric seeing\u003c\/strong\u003e. Under such conditions, it would be an excellent choice for attempting to resolve the Cassini Division in Saturn's rings all the way around or splitting very tight double stars like Epsilon Lyrae into its four components.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy choose a 52° field of view for the ES 3mm eyepiece instead of a wider one?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 52° apparent field of view is a deliberate design choice to maximize on-axis contrast and sharpness. For high-power planetary and double star observing, performance at the center of the field is more critical than a wide, immersive view. This design delivers the highest possible image fidelity for these specific targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"Argon-Purged Waterproof\" mean for the ES 3mm 52° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis means the eyepiece barrel is sealed and filled with a dry, inert gas (argon). This process offers two key benefits:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrevents Internal Fogging:\u003c\/strong\u003e It stops condensation from forming on internal lens surfaces when you take the eyepiece from a warm house into the cold night air.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtects Coatings:\u003c\/strong\u003e The seal keeps out moisture and microscopic dust, preventing the growth of fungus and preserving the lens coatings for a longer lifespan.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need a Barlow lens with the Explore Scientific 3mm 52° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAlmost certainly not. For the vast majority of telescopes, the 3mm focal length will provide more than enough magnification on its own. Using a Barlow with this eyepiece would likely push the magnification beyond what the telescope's aperture or the atmospheric seeing can support, resulting in a dim and blurry image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 3mm 52° eyepiece a good choice for resolving the Trapezium in the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is an excellent choice for that specific task. The high power of the 3mm eyepiece will darken the sky background, increasing the contrast between the four main Trapezium stars (A, B, C, and D) and the surrounding nebulosity. On a very steady night, it may also help you glimpse the fainter E and F stars with a moderate-to-large aperture telescope.\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\u003e3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e52°\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\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eYes, Argon-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eEMD (Enhanced Multi-Layer Deposition)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e811803030008\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\"\u003eExplore Scientific 52° 3mm Waterproof Eyepiece - 1.25\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap (Top)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap (Bottom)\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\u003cp\u003eNo downloads are available for this product.\u003c\/p\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":44967200129309,"sku":"ES-EPWP5203-01","price":97.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-3mm-52-deg-Series-Waterproof-Eyepiece-EPWP5203-01-1__92046.1594240349.1280.1280.jpg?v=1684338750"},{"product_id":"explore-scientific-52-10mm-waterproof-eyepiece-1-25","title":"Explore Scientific 52° 10mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e10mm Focal Length\u003c\/li\u003e\n\u003cli\u003e52° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eWaterproof, Argon-Purged Construction\u003c\/li\u003e\n\u003cli\u003eFlat-Field Multi-Element Optical Design\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 52° 10mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 52° 10mm Waterproof Eyepiece delivers a critical medium-power view through its 1.25\" barrel, providing a sharp 52° apparent field of view. This multi-element ocular is argon-purged to be fully waterproof, ensuring it remains free of internal fogging during dewy nights where simpler eyepieces would fail.\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 10mm Focal Length: Your Go-To for Medium Magnification\u003c\/h3\u003e\n\u003cp\u003eA 10mm eyepiece is a foundational tool in any observer's kit, marking the transition from low-power scanning to detailed observation. It provides enough magnification to resolve detail in brighter deep-sky objects and begin splitting tight double stars, without pushing the limits of atmospheric seeing on most nights.\u003c\/p\u003e\n\u003cp\u003eFor many amateur telescopes, this focal length is ideal for targets that are too dim to withstand very high power. Objects like the Dumbbell Nebula (M27) or the galaxies of the Leo Triplet (M65, M66, NGC 3628) are framed perfectly, revealing structure that would be lost at lower magnification.\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\u003e52° Flat-Field Optics for Superior Contrast\u003c\/h3\u003e\n\u003cp\u003eWith an apparent field of view of 52 degrees, this eyepiece presents a classic, immersive window on the sky. Its advanced flat-field, multi-element design produces excellent contrast, which is crucial for discerning faint details against the sky background. This high-contrast view makes it easier to use averted vision—looking slightly to the side of a target—to detect faint extensions in nebulae or the dim outer stars of a globular cluster.\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\u003e1.25\" Barrel with Argon-Purged Waterproofing\u003c\/h3\u003e\n\u003cp\u003eThe chief advantage of this eyepiece is its sealed, waterproof construction. The optical housing is purged with inert argon gas, which prevents internal condensation from forming when the temperature drops. This means you can move from a warm house to a cold observing site without the eyepiece fogging up from the inside.\u003c\/p\u003e\n\u003cp\u003eThis hermetic seal also protects the internal lens coatings from moisture, fungus, and dust over the long term. The standard 1.25\" barrel ensures compatibility with the vast majority of telescope focusers and diagonal mirrors.\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 10mm 52° vs. a Standard 10mm Plössl\u003c\/h3\u003e\n\u003cp\u003eWhile a standard Plössl is a common entry-level eyepiece, the Explore Scientific 52° 10mm offers distinct advantages for a modest increase in investment.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Plössl Advantage:\u003c\/strong\u003e A simple 4-element Plössl is often lighter and less expensive.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific 52° Advantage:\u003c\/strong\u003e The multi-element, flat-field design of the Explore Scientific eyepiece provides sharper stars at the edge of the field, especially in faster telescopes. Its superior contrast and fully waterproof build make it a far more reliable and capable tool for serious deep-sky observing.\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 10mm 52° eyepiece waterproof?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe eyepiece is hermetically sealed and purged with \u003cstrong\u003einert argon gas\u003c\/strong\u003e. This process removes internal moisture-laden air, preventing condensation from forming on the internal lens surfaces when the eyepiece gets cold. It also protects the delicate coatings from long-term degradation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 52° field of view in this eyepiece compare to a standard Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 52° apparent field of view is very similar to that of a classic Plössl design. The key difference is in the optical correction; the Explore Scientific 52° series uses a more advanced \u003cstrong\u003eflat-field design\u003c\/strong\u003e that maintains better star sharpness toward the edge of the field compared to a comparably priced Plössl.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will this 10mm eyepiece perform on the Orion Nebula (M42) in an 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn an 8\" f\/10 SCT, this 10mm eyepiece will provide 203x magnification. This is an excellent power for examining the core of the Orion Nebula (M42), easily resolving the four primary stars of the Trapezium cluster (Theta-1 Orionis) and revealing the intricate gas clouds and structures immediately surrounding them.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 10mm 52° a good choice for globular clusters like M13 in a 6\" f\/8 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's a great choice. In a 6\" f\/8 Dobsonian, a 10mm eyepiece yields 122x magnification. This is often the sweet spot for resolving the dense core of the Hercules Cluster (M13) into individual stars while keeping the cluster beautifully framed within the 52° field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is a 10mm eyepiece considered a 'workhorse' focal length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA 10mm eyepiece provides a significant step up in magnification from low-power \"finder\" eyepieces without being so powerful that the view is easily blurred by atmospheric turbulence. It's versatile enough for planetary viewing on steady nights, resolving details in galaxies, and studying planetary nebulae, making it one of the most frequently used eyepieces in a collection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is 'averted vision' and why is this eyepiece good for it?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAverted vision is the technique of looking slightly to the side of a faint object to see it more clearly. This places the image on a part of your retina that is more sensitive to low light. The Explore Scientific 10mm 52° eyepiece is excellent for this because its \u003cstrong\u003ehigh-contrast optics\u003c\/strong\u003e make the faint glow of deep-sky objects stand out more distinctly from the black sky background, making the technique more effective.\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\u003e10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e52°\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\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eYes, Argon-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e811803030039\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\"\u003eExplore Scientific 52° 10mm 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":44967200162077,"sku":"ES-EPWP5210-01","price":97.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-10mm-52-deg-Series-Waterproof-Eyepiece-EPWP5210-01-1__02175.1594240350.1280.1280.jpg?v=1684338755"},{"product_id":"explore-scientific-52-15mm-waterproof-eyepiece-1-25","title":"Explore Scientific 52° 15mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e15mm Focal Length\u003c\/li\u003e\n\u003cli\u003e52° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eWaterproof, Argon-Purged Construction\u003c\/li\u003e\n\u003cli\u003eFlat-Field Multi-Element Optical Design\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 52° 15mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n      \u003cp\u003eThe Explore Scientific 52° 15mm Waterproof Eyepiece delivers essential mid-range magnification in a rugged 1.25\" barrel design. Its multi-element, flat-field optical system provides a sharp 52° apparent field of view, offering a distinct upgrade in edge-to-edge clarity over comparably priced Plössl eyepieces.\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\u003e15mm Focal Length: The Deep-Sky Workhorse\u003c\/h3\u003e\n      \u003cp\u003ePositioned squarely in the mid-magnification range for most telescopes, the 15mm focal length is a true workhorse for deep-sky observation. It provides a significant increase in image scale over low-power eyepieces, darkening the sky background to enhance contrast. This makes the faint arms of galaxies and the delicate structures within nebulae like the Lagoon Nebula (M8) more apparent, especially from suburban locations.\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 52° Flat-Field View vs. a Standard Plössl\u003c\/h3\u003e\n      \u003cp\u003eWhile the 52° apparent field is only slightly wider than a typical Plössl, the true advantage of the Explore Scientific 52° series lies in its flat-field optical design. This advanced, multi-element construction corrects for field curvature, ensuring stars remain sharp points across the entire field of view, not just in the center.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eEdge-to-Edge Sharpness:\u003c\/strong\u003e Where a standard Plössl may show stars becoming elongated near the field stop, this eyepiece maintains tight, point-like stars for a more pleasing and detailed view.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eEnhanced Contrast:\u003c\/strong\u003e Superior coatings and internal baffling produce high-contrast images that make it easier to employ techniques like averted vision to detect the faintest details in objects.\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\u003eArgon-Purged and Waterproof for Field Reliability\u003c\/h3\u003e\n      \u003cp\u003eUnlike standard eyepieces, every Explore Scientific 52° eyepiece is built to withstand harsh observing conditions. The optical housing is sealed and purged with inert argon gas, making it fully waterproof. This design offers two critical benefits for real-world astronomy.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eNo Internal Fogging:\u003c\/strong\u003e The argon-purged barrel prevents moisture from getting inside the eyepiece on dewy nights, eliminating the possibility of internal fogging that can end an observing session.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eEasy Cleaning \u0026amp; Longevity:\u003c\/strong\u003e The sealed optics are protected from fungus, dust, and moisture, ensuring a long service life. If the outer lens gets dirty, you can safely rinse the eyepiece under running water without risk.\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 will the Explore Scientific 15mm 52° eyepiece perform on the Orion Nebula (M42) in an 8-inch f\/6 Dobsonian?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIn an 8-inch f\/6 Dobsonian (1200mm focal length), the 15mm eyepiece yields 80x magnification. This is an excellent power for M42, providing enough image scale to resolve the four main stars of the Trapezium (Theta Orionis) while keeping the entire nebula, including its faint outer wings, comfortably within the 52° field of view.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 15mm focal length a good choice for globular clusters like M13 in an f\/10 SCT?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, it's a great starting point. On a typical 8\" f\/10 SCT (2032mm focal length), the 15mm provides 135x magnification. This is often enough to begin resolving the dense core of the Hercules Cluster (M13) into individual stars from a dark sky site, and the high-contrast optics will help the cluster stand out against the darkened sky background.\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 Explore Scientific 15mm 52° over a standard 15mm Plössl?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe primary advantages are its \u003cstrong\u003eflat-field optics\u003c\/strong\u003e and \u003cstrong\u003ewaterproof construction\u003c\/strong\u003e. The flat field provides noticeably sharper stars at the edge of the view compared to a Plössl. The argon-purged, sealed body prevents internal fogging and makes the eyepiece far more durable for use in damp conditions.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does 'Argon-Purged Waterproof' mean for the Explore Scientific 15mm eyepiece?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis means the eyepiece barrel is sealed with O-rings and filled with an inert gas (argon) that contains no water vapor. This process makes the eyepiece completely waterproof, prevents internal lenses from fogging up during temperature changes, and protects the delicate optical coatings from moisture, dust, and fungus over the long term.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the Explore Scientific 15mm 52° eyepiece good for 'averted vision'?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe product description highlights this because of the eyepiece's excellent contrast. Averted vision—looking slightly to the side of a faint object—works by placing the image on a more light-sensitive part of your retina. A high-contrast eyepiece makes this technique more effective by presenting a cleaner, darker background, which helps your eye detect the subtle glow of faint fuzzies like distant galaxies.\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 Explore Scientific 15mm 52° eyepiece suitable for eyeglass wearers?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe manufacturer does not publish a specific eye relief value for this eyepiece. While many observers find 52° designs comfortable, those who require eyeglasses to correct for significant astigmatism may not be able to see the full field of view. Eyeglass wearers typically need eyepieces with at least 15-20mm of eye relief for comfortable viewing.\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\u003e52°\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\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eWaterproof, Argon-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eFlat-Field Multi-Element\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e811803030046\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\"\u003eExplore Scientific 52° 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":44967200227613,"sku":"ES-EPWP5215-01","price":97.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-52-deg-15mm-Waterproof-Eyepiece-EPWP5215-01-1__87791.1594240350.1280.1280.jpg?v=1684338760"},{"product_id":"explore-scientific-52-20mm-waterproof-eyepiece-1-25","title":"Explore Scientific 52° 20mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e20mm Focal Length\u003c\/li\u003e\n\u003cli\u003e52° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eWaterproof \u0026amp; Argon-Purged Construction\u003c\/li\u003e\n\u003cli\u003eFlat-Field Multi-Element Optical Design\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\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 52° 20mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 52° 20mm Waterproof Eyepiece delivers a generous 52° apparent field of view in a standard 1.25\" barrel, providing a significant upgrade over basic kit eyepieces. Its 20mm focal length produces a versatile mid-range magnification ideal for locating and framing a wide range of celestial objects, from open star clusters to large nebulae.\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 20mm Focal Length: A 52° Flat-Field View\u003c\/h3\u003e\n\u003cp\u003eThe 20mm focal length is often considered a \"workhorse\" for many amateur telescopes, offering a balance between a wide true field for context and enough magnification to resolve detail. The 52° apparent field feels more immersive than a typical Plössl and the flat-field multi-element design ensures stars remain sharp across the view, not just in the center.\u003c\/p\u003e\n\u003cp\u003eThis optical combination is ideal for sweeping the star fields of the Milky Way or stepping through the targets of a Messier Marathon. For observers with binoviewers, the compact size and comfortable view make the 20mm 52° an excellent choice for creating a matched pair.\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\u003eArgon-Purged Construction: A 1.25\" Eyepiece Sealed for Life\u003c\/h3\u003e\n\u003cp\u003eUnlike standard eyepieces, this 1.25\" ocular is fully waterproof and sealed with an inert argon gas purge. This process prevents internal fogging during nights with heavy dew and permanently protects the internal lens surfaces from dust, moisture, and fungus. You get a clean, high-contrast view every time you observe, without worrying about internal contamination.\u003c\/p\u003e\n\u003cp\u003eThe trade-off for this level of protection is that the eyepiece is sealed at the factory and not intended to be disassembled by the user. However, this robust construction ensures a lifetime of reliable use under all observing 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\u003eExplore Scientific 52° 20mm vs. a Standard Plössl\u003c\/h3\u003e\n\u003cp\u003eWhile a Plössl is a classic design, the Explore Scientific 52° Series offers distinct advantages for a comparable price. The advanced optical design provides superior contrast, which is critical for teasing out faint details in galaxies and nebulae. This enhanced contrast also makes it easier to use averted vision—looking slightly to the side of a target to place it on a more light-sensitive part of your retina.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperior Contrast:\u003c\/strong\u003e The multi-element design and modern coatings deliver darker sky backgrounds and make faint objects \"pop\" more than in simpler four-element eyepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWider, Flatter Field:\u003c\/strong\u003e The 52° apparent field is not only wider than many Plössls but is also better corrected towards the edge, keeping stars sharp across a larger portion of the view.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSealed Construction:\u003c\/strong\u003e The waterproof, argon-purged body offers a level of durability and protection against the elements that unsealed eyepieces cannot match.\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 52° 20mm eyepiece different from a standard 20mm Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Explore Scientific 52° 20mm offers three main advantages over a comparably priced Plössl. It has a wider \u003cstrong\u003e52° apparent field of view\u003c\/strong\u003e, a \u003cstrong\u003eflat-field design\u003c\/strong\u003e for better edge-of-field sharpness, and a fully \u003cstrong\u003ewaterproof, argon-purged construction\u003c\/strong\u003e that prevents internal fogging and contamination.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the waterproof design of the ES 52° 20mm eyepiece benefit my observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe waterproof and argon-purged design prevents moisture from getting inside the eyepiece on dewy nights, eliminating the possibility of internal fogging. It also creates a sealed environment that protects the internal optics from dust, pollen, and fungus, ensuring the eyepiece maintains its original contrast and clarity for years.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 52° 20mm a good eyepiece for binoviewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. As noted by Explore Scientific, its relatively small physical size and versatile magnification make the 20mm 52° Series a good selection for use in binoviewers. You can create a well-matched pair without adding excessive weight or balance issues to your telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kinds of objects are best viewed with the Explore Scientific 52° 20mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 20mm focal length is excellent for medium-power views of a wide variety of objects. It's ideal for framing \u003cstrong\u003elarge open clusters\u003c\/strong\u003e like the Pleiades (M45) or Beehive Cluster (M44), observing \u003cstrong\u003eextended nebulae\u003c\/strong\u003e like the Lagoon Nebula (M8), and locating targets when sweeping rich star fields.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Explore Scientific 52° 20mm eyepiece perform on the Orion Nebula (M42) in an 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 8\" f\/10 SCT with a 2032mm focal length, the 20mm eyepiece will provide about 102x magnification. This is an excellent power for framing the entire Orion Nebula (M42), from the bright core of the Trapezium cluster out to the fainter \"wings\" of nebulosity, all within a single, high-contrast field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 20mm focal length suitable for a Messier Marathon with a 6\" f\/8 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. A 6\" f\/8 Dobsonian has a focal length of around 1200mm, where the 20mm eyepiece yields 60x magnification and a true field of view of approximately 0.87 degrees. This is a perfect \"finder\" magnification for a Messier Marathon, wide enough to easily locate objects but with enough power to identify them clearly.\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\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e52°\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\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eWaterproof, Argon-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e811803030053\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\"\u003eExplore Scientific 52° 20mm Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\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":44967200293149,"sku":"ES-EPWP5220-01","price":97.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-20mm-52-deg-Series-Waterproof-Eyepiece-EPWP5220-01-1__67213.1594240351.1280.1280.jpg?v=1684338766"},{"product_id":"explore-scientific-52-25mm-waterproof-eyepiece-1-25","title":"Explore Scientific 52° 25mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e25mm Focal Length\u003c\/li\u003e\n\u003cli\u003e52° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eWaterproof \u0026amp; Argon-Purged Construction\u003c\/li\u003e\n\u003cli\u003eWeighs 6.4 oz (181.4 g)\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 52° 25mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 52° 25mm Waterproof Eyepiece delivers a generous 52° apparent field of view in a standard 1.25\" barrel format. As a multi-element, flat-field ocular weighing just 6.4 oz, it serves as a significant optical upgrade over basic eyepieces, providing a comfortable, high-contrast view at the versatile 25mm focal length.\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 Flat-Field 52° View Beyond Standard Plössls\u003c\/h3\u003e\n\u003cp\u003eWith a 52° apparent field, this eyepiece offers an immersive window that feels wider and more comfortable than many traditional designs. Its flat-field optics correct for distortions at the edge of view, ensuring stars remain sharp across the entire field, not just in the center. This correction, combined with excellent contrast, makes it easier to detect faint details in galaxies and nebulae.\u003c\/p\u003e\n\u003cp\u003eThe high-contrast image is particularly effective for using averted vision—looking slightly to the side of a dim object. This technique places the image on a more light-sensitive part of your retina, and the clean, dark background of the 52° 25mm eyepiece makes those faint fuzzies pop into view more readily.\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 6.4 oz Argon-Purged Waterproof Optic\u003c\/h3\u003e\n\u003cp\u003eBuilt to withstand demanding field conditions, the eyepiece is fully waterproof and purged with inert argon gas. This process prevents internal fogging during nights with heavy dew and protects the internal lens coatings from moisture and fungus, ensuring a lifetime of use. The durable construction adds reliability without excessive mass.\u003c\/p\u003e\n\u003cp\u003eAt a lightweight 6.4 oz (181.4 g), the 52° 25mm is easy to handle and helps maintain your telescope's balance, especially when used in pairs for a binoviewer. Its low weight makes it an ideal workhorse eyepiece that you can switch in and out without needing to rebalance the optical tube.\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\"\u003eWhat makes the Explore Scientific 25mm 52° eyepiece better than a standard Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile sharing a similar apparent field, the Explore Scientific 52° 25mm uses a more advanced \u003cstrong\u003emulti-element, flat-field design\u003c\/strong\u003e. This results in sharper stars at the edge of the field and typically offers better contrast and eye comfort compared to a comparably priced, simpler Plössl eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does 'Argon-Purged Waterproof' mean for the 25mm 52° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis means the eyepiece barrel is sealed and filled with inert argon gas. This process achieves two key benefits:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWaterproofing:\u003c\/strong\u003e It prevents moisture, dew, or rain from getting inside the eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnti-Fogging:\u003c\/strong\u003e It stops internal lenses from fogging up when moving from a warm house to a cold observing site, ensuring a clear view all night.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Explore Scientific 25mm eyepiece perform for finding faint objects like the Andromeda Galaxy (M31) in a 10\" Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 10\" f\/5 Dobsonian (1250mm focal length), the 25mm eyepiece provides 50x magnification. This is an ideal low-power magnification for framing large objects like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000), making it an excellent \"finder\" eyepiece for locating and centering deep-sky targets before increasing magnification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 25mm 52° a good choice for a binoviewer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent choice. Its light weight of only \u003cstrong\u003e6.4 oz\u003c\/strong\u003e means a pair of them won't put excessive strain on your focuser or require significant counterweights. The comfortable view also makes extended observing with two eyes much more enjoyable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have an 8\" f\/10 SCT. What kind of views can I expect with the 25mm 52° eyepiece on the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOn a typical 8\" SCT with a 2032mm focal length, the 25mm eyepiece yields 81x magnification. This is a perfect magnification for framing the entire Orion Nebula (M42), from the bright Trapezium stars at its core to the faint, sweeping outer loops of nebulosity, all within a single high-contrast field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is averted vision, and why is this 25mm eyepiece good for it?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eAverted vision\u003c\/strong\u003e is the technique of looking slightly to the side of a faint object to see it more clearly. The Explore Scientific 52° 25mm eyepiece has excellent contrast and a dark background, which makes it easier for the faint light from objects like nebulae or galaxies to be detected by the more sensitive peripheral parts of your vision.\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\u003e25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e52°\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\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eYes, Argon-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e6.4 oz \/ 181.4 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e811803030060\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\"\u003eExplore Scientific 52° 25mm 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":44967200325917,"sku":"ES-EPWP5225-01","price":111.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-25mm-52-deg-Series-Waterproof-Eyepiece-EPWP5225-01-1__63744.1594240352.1280.1280.jpg?v=1684338771"},{"product_id":"explore-scientific-52-30mm-waterproof-eyepiece-1-25","title":"Explore Scientific 52° 30mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e30mm Focal Length\u003c\/li\u003e\n\u003cli\u003e52° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eWaterproof \u0026amp; Argon-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 52° 30mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 52° 30mm Waterproof Eyepiece yields an expansive true field of view from a standard 1.25\" barrel. Its 30mm focal length produces the low magnification needed for locating faint objects, and the 52° apparent field creates a comfortable, flat-field window on large nebulae and galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 30mm Focal Length Advantage: Wide Fields for Deep Sky\u003c\/h3\u003e\n\u003cp\u003eA 30mm eyepiece is a critical tool for any deep-sky observer. It produces a large exit pupil that floods your eye with light, revealing the faint, extended details in galaxies and nebulae. This low-power, wide-field view is essential for initially locating targets and is often the best choice for framing large objects like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000) in their entirety.\u003c\/p\u003e\n\u003cp\u003eWhen atmospheric seeing is poor, high magnification only amplifies the turbulence. The low power of the 30mm eyepiece maintains a stable, sharp image, allowing you to continue observing when other eyepieces would be unusable. It serves as the ideal starting point for any observing session, giving you the \"big picture\" view of the 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\u003e52° Flat-Field Optics for High-Contrast Views\u003c\/h3\u003e\n\u003cp\u003eThe Explore Scientific 52° series uses a multi-element, flat-field optical design that pushes it beyond a simple Plössl. The 52° apparent field is comfortable and immersive, but its real strength is the exceptional contrast and edge-to-edge sharpness. This optical correction is vital for discerning subtle details in faint objects.\u003c\/p\u003e\n\u003cp\u003eThis high contrast makes the eyepiece particularly effective for using averted vision—the technique of looking slightly to the side of a faint object. By placing the image on a more light-sensitive part of your retina, you can perceive details that are otherwise invisible. The clean, dark background of this eyepiece makes that technique significantly more productive.\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\u003eArgon-Purged for a Lifetime of Waterproof Integrity\u003c\/h3\u003e\n\u003cp\u003eUnlike standard eyepieces, the Explore Scientific 52° 30mm is a fully sealed and waterproof unit. The optical housing is purged of air and filled with inert argon gas. This process makes it impossible for internal fogging to occur, even during nights with heavy dew, and permanently protects the internal lens surfaces from dust, fungus, and moisture.\u003c\/p\u003e\n\u003cp\u003eThis robust construction ensures that the eyepiece will maintain its out-of-the-box optical clarity for years without needing internal cleaning. The trade-off for this durability is that the sealed unit cannot be disassembled by the user, but the design ensures it will never need to be.\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 52° 30mm vs. a Standard 1.25\" Plössl\u003c\/h3\u003e\n\u003cp\u003eWhile a 30mm or 32mm Plössl is a common low-power eyepiece, the Explore Scientific 52° 30mm represents a significant step up in optical design and user comfort. A direct comparison reveals several key advantages for the deep-sky observer.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat Field:\u003c\/strong\u003e Standard Plössls often exhibit some field curvature, meaning stars near the edge of the view are not perfectly sharp. The multi-element design of the ES 52° eyepiece is corrected to produce a flatter field, keeping stars tight across the entire view.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEye Relief:\u003c\/strong\u003e This eyepiece is designed for superior viewing comfort compared to many Plössls, making it easier to hold your eye position for long, relaxed observing sessions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContrast:\u003c\/strong\u003e Enhanced baffling and modern multi-coatings contribute to a darker sky background, which is crucial for picking out the faintest details in galaxies and nebulae.\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\"\u003eWhy choose the Explore Scientific 52° 30mm eyepiece for finding objects?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e30mm focal length\u003c\/strong\u003e produces a very wide true field of view, showing you a much larger patch of sky than a high-power eyepiece. This makes it significantly easier to star-hop and locate your target object before switching to higher magnifications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the ES 52° 30mm eyepiece help in viewing large objects like the Andromeda Galaxy (M31) through a Schmidt-Cassegrain telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eSchmidt-Cassegrains (SCTs) have long focal lengths, which can make it difficult to fit large deep-sky objects into the field of view. The Explore Scientific 52° 30mm eyepiece provides the lowest practical magnification, ensuring that you can see the full extent of large targets like the Andromeda Galaxy (M31) or the Pleiades (M45) within a single, well-framed view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"Argon-Purged Waterproof\" mean for the ES 52° 30mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis means the eyepiece is hermetically sealed to prevent moisture, dust, or fungus from ever entering the optical housing. The air inside has been replaced with \u003cstrong\u003einert argon gas\u003c\/strong\u003e, which stops internal lens surfaces from fogging up on cold, humid nights. It ensures the eyepiece remains internally pristine for its entire lifespan.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ES 52° 30mm a good choice for a portable, short-focal-length refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent match. On a short refractor, this eyepiece will function as a \"finder\" eyepiece, delivering an extremely wide true field of view for sweeping the Milky Way's star fields and observing large emission nebulae like the North American Nebula (NGC 7000).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the main benefits of the Explore Scientific 52° 30mm over a similarly priced Plössl eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eCompared to a standard Plössl, the Explore Scientific 52° 30mm offers a \u003cstrong\u003eflatter field of view\u003c\/strong\u003e (sharper stars at the edge), generally \u003cstrong\u003ebetter eye relief\u003c\/strong\u003e for more comfortable viewing, and a sealed, \u003cstrong\u003ewaterproof build\u003c\/strong\u003e for enhanced durability and longevity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I see the shadow of my secondary mirror with this 30mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn very \"fast\" telescopes (f\/5 or lower), a 30mm eyepiece can produce an exit pupil so large that you may notice the dark silhouette of your telescope's secondary mirror. However, in most common telescopes like f\/8 refractors or f\/10 Schmidt-Cassegrains, the exit pupil is smaller and this is rarely an issue during nighttime observing.\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\u003e30mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e52°\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\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e811803030077\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\"\u003eExplore Scientific 52° 30mm 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\u003cp\u003eNo manual or software is available for this product.\u003c\/p\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 Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967200358685,"sku":"ES-EPWP5230-01","price":139.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-30mm-52-deg-Series-Waterproof-Eyepiece-EPWP5230-01-1__12318.1594240352.1280.1280.jpg?v=1684338847"},{"product_id":"explore-scientific-52-40mm-waterproof-eyepiece-2","title":"Explore Scientific 52° 40mm Waterproof Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e40mm Focal Length\u003c\/li\u003e\n\u003cli\u003e52° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" Diameter Barrel\u003c\/li\u003e\n\u003cli\u003eWaterproof and Argon-Purged Construction\u003c\/li\u003e\n\u003cli\u003eFully Multi-Coated, Flat-Field Optics\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 52° 40mm Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 52° 40mm Waterproof Eyepiece delivers the widest possible true field of view for deep-sky observers using long focal length telescopes. Its 40mm focal length produces low magnification for scanning vast star fields, while the 52° apparent field offers a sharp, flat window that makes this the only 2-inch eyepiece in the 52° series.\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\u003eDeep-Sky Views: The 40mm Focal Length Advantage\u003c\/h3\u003e\n\u003cp\u003eWith a 40mm focal length, this eyepiece is engineered for observers hunting the faintest objects at the limit of their telescope's reach. The low magnification darkens the sky background and increases surface brightness, making it ideal for framing large targets like the Andromeda Galaxy (M31), the Rosette Nebula (NGC 2244), and sprawling open star clusters.\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 52° Flat-Field Window on the Sky\u003c\/h3\u003e\n\u003cp\u003eUnlike a standard Plössl, the Explore Scientific 52° 40mm uses a multi-element, flat-field optical design. This corrects for field curvature, keeping stars sharp across the entire 52° apparent field. The high-contrast optics make it easier to use averted vision—looking slightly to the side of a faint object—to detect subtle details in galactic structure or faint nebulosity that would otherwise be invisible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBuilt for the Field: Argon-Purged and Waterproof in a 2\" Barrel\u003c\/h3\u003e\n\u003cp\u003eDesigned for real-world observing conditions, this eyepiece is fully waterproof and purged with inert argon gas. This process prevents internal fogging during nights with heavy dew and stops contaminants like dust or fungus from ever entering the sealed optical path. As the only 2-inch model in the 52° lineup, it's built to provide a lifetime of reliable views.\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\u003eChoosing Your 40mm: 52° vs. 62° and 68° Series Eyepieces\u003c\/h3\u003e\n\u003cp\u003eExplore Scientific offers three distinct 40mm eyepieces, each serving a different purpose. The choice depends on your priority between an immersive field and maximum viewing comfort.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e52° Series (This Model):\u003c\/strong\u003e Offers the longest eye relief of the three. It's the top choice for observers who wear glasses or prefer the most comfortable, relaxed view without needing to press their eye close to the lens.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e62° and 68° Series:\u003c\/strong\u003e These eyepieces provide a significantly wider, more immersive apparent field of view. This \"spacewalk\" effect comes with shorter eye relief, making them better suited for observers who do not require eyeglasses.\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 52° 40mm eyepiece in an 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 8\" f\/10 SCT with a 2032mm focal length, the Explore Scientific 52° 40mm eyepiece yields 51x magnification and a wide true field of view. It's perfect for framing large deep-sky objects like the entire Andromeda Galaxy (M31), the North American Nebula (NGC 7000), the Veil Nebula complex in Cygnus, and large open clusters like the Pleiades (M45).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does waterproofing help the Explore Scientific 52° 40mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003ewaterproof and argon-purged\u003c\/strong\u003e construction prevents moisture from getting inside the eyepiece on dewy nights, which would cause internal fogging and ruin a view. It also creates a sealed environment that protects the internal multi-coatings from dust, pollen, and fungus for the life of the eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy choose the Explore Scientific 52° 40mm over the 68° 40mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary reason is \u003cstrong\u003eeye relief\u003c\/strong\u003e. The 52° 40mm model is designed for maximum viewing comfort, especially for observers who need to wear eyeglasses to correct for astigmatism. While the 68° version offers a wider, more immersive field, the 52° is the more practical choice if long eye relief is your priority.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 52° 40mm eyepiece good for a fast f\/5 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn an f\/5 telescope, this eyepiece produces a very large 8mm exit pupil (40mm \/ 5). Since most dark-adapted human pupils only open to 7mm, some of the light gathered by your telescope will be wasted. You may also see the shadow of your telescope's secondary mirror. It is generally better suited for telescopes with focal ratios 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 is the benefit of a \"flat-field\" design in the Explore Scientific 52° 40mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA flat-field design corrects for optical aberrations that can make stars near the edge of the view appear blurry or stretched. With this eyepiece, stars remain sharp, point-like sources across the entire \u003cstrong\u003e52° apparent field of view\u003c\/strong\u003e, providing a more pleasing and accurate image, especially when scanning dense star fields in the Milky Way.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2\" filters with the Explore Scientific 52° 40mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 2-inch barrel of the Explore Scientific 52° 40mm eyepiece is threaded to accept standard 2-inch (M48x0.75) astronomy filters. This allows you to easily add nebula filters, light pollution filters, or polarizers to enhance your views.\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\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e811803030084\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":44967200424221,"sku":"ES-EPWP5240-01","price":209.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-40mm-52-deg-Series-Waterproof-Eyepiece-EPWP5240-01-1__01847.1594240353.1280.1280.jpg?v=1684338853"},{"product_id":"explore-scientific-52-4-5mm-waterproof-eyepiece-1-25","title":"Explore Scientific 52° 4.5mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eHigh-magnification focal length for detailed views\u003c\/li\u003e\n\u003cli\u003e52° apparent field of view\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" barrel format\u003c\/li\u003e\n\u003cli\u003eWaterproof and argon-purged for all-weather use\u003c\/li\u003e\n\u003cli\u003eFlat-field multi-element optical design\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 52° 4.5mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 52° 4.5mm Waterproof Eyepiece delivers high-magnification views ideal for planets, double stars, and compact deep-sky objects, weighing only 181.4 grams. With a 52° apparent field and a 1.25\" barrel, this ocular is built for any observing conditions thanks to its waterproof, argon-purged housing. The flat-field, multi-element design darkens the sky background, enhancing contrast for detailed 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\u003eHigh-Power Planetary and Compact DSO Views\u003c\/h3\u003e\n\u003cp\u003eThis 4.5mm eyepiece is engineered for high magnification, bringing out fine details in planets and splitting tight double stars. It also excels on bright, compact deep-sky objects; the increased image scale makes planetary nebulae and globular clusters impressive as they fill the field of view. By concentrating light from the object and darkening the surrounding sky, this eyepiece significantly boosts contrast.\u003c\/p\u003e\n\u003cp\u003eAchieving these detailed views is highly dependent on atmospheric stability. The benefits of high power are only realized when seeing conditions are favorable enough to support a sharp, steady image.\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\u003eFlat-Field Optics for Enhanced Contrast\u003c\/h3\u003e\n\u003cp\u003eThe Explore Scientific 52° Series features a flat-field, multi-element optical system that provides sharp images across the entire field. This design delivers exceptional contrast, which is critical for teasing out faint details. It makes the skill of using averted vision more effective, allowing you to place a dim object slightly off-center in the field.\u003c\/p\u003e\n\u003cp\u003eBy doing so, the image falls on a part of your eye that is more sensitive to low light. This technique, aided by the eyepiece's clean optical presentation, can be the difference between detecting a faint galaxy's outer arm or missing it entirely.\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\u003eArgon-Purged All-Weather Construction\u003c\/h3\u003e\n\u003cp\u003eDesigned for reliability, the eyepiece is fully waterproof and purged with inert argon gas. This process prevents internal fogging, which can occur when moving from a warm house to a cold night, and protects the internal lens coatings from moisture-induced degradation over the long term. This robust construction ensures your eyepiece is ready to perform regardless of dew or humidity.\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\u003eAdvanced Multi-Element Design vs. Standard Plössls\u003c\/h3\u003e\n\u003cp\u003eWhile a Plössl is a classic design, the Explore Scientific 52° 4.5mm eyepiece offers a significant step up in optical sophistication for a comparable investment. Its multi-element, flat-field design provides better edge-of-field correction and contrast than what is typically found in a standard four-element Plössl. This results in a more immersive and comfortable viewing experience, especially during long planetary sessions where you are studying subtle features at high power.\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\"\u003eWhat objects are best observed with the Explore Scientific 4.5mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Explore Scientific 4.5mm eyepiece is a high-power ocular, making it ideal for observing objects that benefit from high magnification. This includes resolving details on \u003cstrong\u003eplanets\u003c\/strong\u003e like Jupiter's cloud bands and Saturn's rings, splitting \u003cstrong\u003eclose double stars\u003c\/strong\u003e, and examining bright, compact \u003cstrong\u003edeep-sky objects\u003c\/strong\u003e like planetary nebulae (e.g., the Ring Nebula, M57) and the cores of globular clusters (e.g., 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 high magnification of the 4.5mm eyepiece help with faint objects?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eHigh magnification darkens the sky background. This increases the \u003cstrong\u003econtrast\u003c\/strong\u003e between a faint object and the surrounding sky, often making the object easier to see. While it doesn't make the object intrinsically brighter, the improved contrast can reveal subtle details that would be lost at lower powers. This is especially effective for small planetary nebulae and galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is an argon-purged eyepiece like the Explore Scientific 4.5mm better than a standard one?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn argon-purged eyepiece is sealed and filled with an inert gas, making it \u003cstrong\u003efully waterproof\u003c\/strong\u003e. This has two main benefits: it prevents internal lens surfaces from fogging up in humid conditions or with rapid temperature changes, and it protects the delicate optical coatings from long-term moisture damage and fungus growth, ensuring a longer lifespan.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Explore Scientific 4.5mm eyepiece work well for viewing Mars in my 6\" f\/8 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is an excellent scenario. In a 6\" f\/8 Dobsonian (which has a 1200mm focal length), the 4.5mm eyepiece would yield approximately 267x magnification. This is a powerful combination for observing Martian surface features like the polar ice caps and darker albedo regions, provided the atmospheric seeing is stable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the Explore Scientific 52° eyepiece over a basic Plössl eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Explore Scientific 52° eyepiece uses a more advanced \u003cstrong\u003emulti-element, flat-field design\u003c\/strong\u003e. Compared to a comparably priced Plössl, this typically provides better sharpness at the edge of the field of view and superior contrast. This results in a more comfortable and detailed image, especially for observers who spend a lot of time studying targets at high power.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 4.5mm focal length too much power for my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe maximum useful magnification is typically about 50x to 60x per inch of aperture under excellent seeing conditions. For a 4-inch telescope, this is around 200x-240x. The 4.5mm eyepiece will exceed this on many telescopes, making it very sensitive to atmospheric turbulence. It will perform best in telescopes with shorter focal lengths or on nights of exceptionally steady air.\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\u003e4.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e52°\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\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003eData not available\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Elements\u003c\/td\u003e\n\u003ctd\u003eData not available\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eMulti-coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eYes, Argon-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e6.4 oz (181.4 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e811803030015\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\"\u003eExplore Scientific 52° 4.5mm Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\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":44967200456989,"sku":"ES-EPWP5245-01","price":97.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-4-5mm-52-deg-Series-Waterproof-Eyepiece-EPWP5245-01-1__17085.1594240354.1280.1280.jpg?v=1684338858"},{"product_id":"explore-scientific-52-6-5mm-waterproof-eyepiece-1-25","title":"Explore Scientific 52° 6.5mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e6.5mm Focal Length\u003c\/li\u003e\n\u003cli\u003e52° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eWaterproof and Argon-Purged Construction\u003c\/li\u003e\n\u003cli\u003eMulti-Coated, Flat-Field Optics\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 52° 6.5mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 52° 6.5mm Waterproof Eyepiece delivers high-magnification views in a standard 1.25\" barrel format. Its multi-element optical design produces a 52° apparent field of view, offering a noticeable upgrade in sharpness and contrast over a standard Plössl at the same 6.5mm focal length.\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 52° Flat-Field View Beyond Standard Plössls\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece's multi-element, flat-field design pushes it beyond the performance of a typical Plössl. The 52° apparent field feels more immersive and makes it easier to track objects as they drift, especially on non-driven mounts. Stars remain sharp across the field, a critical factor when examining tight double stars or the cores of globular clusters.\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 6.5mm Focal Length: High Power for Ideal Seeing\u003c\/h3\u003e\n\u003cp\u003eA 6.5mm focal length provides high magnification, ideal for resolving fine detail on planetary surfaces, splitting close double stars, and examining planetary nebulae. Achieving sharp views at this power is challenging and depends on steady atmospheric seeing, precise telescope collimation, and thermal equilibrium. When conditions are right, the views delivered by the 6.5mm eyepiece are unforgettable.\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\u003eArgon-Purged Waterproofing: Dew-Proof and Dust-Proof Optics\u003c\/h3\u003e\n\u003cp\u003eUnlike standard eyepieces, the Explore Scientific 52° series is fully sealed and purged with inert argon gas. This process prevents internal fogging during nights with heavy dew and stops dust, fungus, or moisture from ever contaminating the internal lens surfaces. The result is an eyepiece that is easier to clean, more durable, and maintains its optical contrast for years of use in any climate.\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 52° vs. Plössl: A Step-Up in Contrast and Comfort\u003c\/h3\u003e\n\u003cp\u003eWhile a Plössl is a classic design, the Explore Scientific 52° 6.5mm offers tangible advantages. The primary benefit is improved contrast, which makes it easier to use averted vision to detect faint details or nebulae. This skill, which involves looking slightly to the side of an object, places the image on a more light-sensitive part of your retina, and the high-contrast background of this eyepiece makes that technique more effective.\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\"\u003eWhat objects are best suited for the Explore Scientific 52° 6.5mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 6.5mm focal length provides high power, making it ideal for small, bright objects. It excels at revealing detail on \u003cstrong\u003eplanets like Jupiter and Saturn\u003c\/strong\u003e, splitting \u003cstrong\u003eclose double stars\u003c\/strong\u003e, and resolving the cores of \u003cstrong\u003ebright globular clusters like M13\u003c\/strong\u003e. It is also excellent for viewing small \u003cstrong\u003eplanetary nebulae such as the Ring Nebula (M57)\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Explore Scientific 6.5mm eyepiece perform on Jupiter with an 8\" f\/10 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 (2032mm focal length), the 6.5mm eyepiece will yield a magnification of 312x. This is an excellent power for observing Jupiter's cloud bands, the Great Red Spot, and shadow transits of its moons, provided you have good atmospheric seeing. The eyepiece's high contrast will help make these features stand out.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is a waterproof, argon-purged eyepiece like the Explore Scientific 6.5mm useful?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe argon-purged, waterproof design provides two key benefits:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDew Prevention:\u003c\/strong\u003e It prevents internal lens surfaces from fogging up in damp conditions, which is a common problem during long observing sessions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLongevity:\u003c\/strong\u003e The sealed barrel protects the internal coatings from moisture, fungus, and dust, ensuring the eyepiece maintains its optical clarity and contrast for many years.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 52° 6.5mm a significant upgrade over a standard 6mm Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, for several reasons. The Explore Scientific 52° eyepiece offers a \u003cstrong\u003eflatter field of view\u003c\/strong\u003e, meaning stars stay sharp closer to the edge. It also provides \u003cstrong\u003ebetter contrast\u003c\/strong\u003e, which is crucial for seeing faint details on planets or teasing out dim stars. Finally, its \u003cstrong\u003ewaterproof construction\u003c\/strong\u003e makes it far more durable and reliable in variable weather conditions.\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 6.5mm eyepiece to split the Double-Double (Epsilon Lyrae) in my 4\" refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. A 4-inch (102mm) refractor has the resolving power to split the components of Epsilon Lyrae, which are separated by about 2.5 arc-seconds. The high magnification provided by the 6.5mm eyepiece will be essential for cleanly separating the two pairs, making this a perfect combination for that classic observing challenge on a night of steady seeing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eThe description mentions averted vision. How does the Explore Scientific 52° 6.5mm eyepiece help with this technique?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAverted vision works best when the object you're trying to see is set against a dark, high-contrast background. The Explore Scientific 52° eyepiece's advanced multi-coatings and optical design produce a very dark sky background with minimal scattered light. This boosts contrast, making it easier for the more sensitive parts of your peripheral vision to detect faint objects like the central star in the Ring Nebula (M57) or faint extensions of galaxies.\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\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e811803030022\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":44967200489757,"sku":"ES-EPWP5265-01","price":97.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-52-deg-6-5mm-Waterproof-Eyepiece-EPWP5265-01-1__17455.1594240354.1280.1280.jpg?v=1684338863"},{"product_id":"explore-scientific-68-20mm-waterproof-eyepiece-1-25","title":"Explore Scientific 68° 20mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e20mm Focal Length\u003c\/li\u003e\n\u003cli\u003e68° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eArgon-Purged Waterproof Construction\u003c\/li\u003e\n\u003cli\u003eParfocal with other ES 68° Eyepieces\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 68° 20mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 68° 20mm Waterproof Eyepiece delivers a wide 68° apparent field of view in a standard 1.25\" barrel format. Its 20mm focal length provides the medium-power magnification needed to frame larger deep-sky objects like the Lagoon Nebula (M8) or the Andromeda Galaxy (M31) while maintaining a bright, high-contrast image.\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 68° Immersive, Flat-Field View\u003c\/h3\u003e\n\u003cp\u003eEngineered with an advanced optical design, this eyepiece uses combinations of low-dispersion and high-refractive-index glasses to deliver sharp, high-resolution views. The 68° apparent field creates an immersive viewing window, while the optics are optimized to maintain a superior flat field, ensuring stars remain tight points from the center to the edge of the view.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Multi-Coatings:\u003c\/strong\u003e Every air-to-glass surface is treated with enhanced multilayer deposition coatings to maximize light transmission and contrast, darkening the sky background and making faint details pop.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImmersion Experience:\u003c\/strong\u003e The combination of a wide field and long eye relief provides a comfortable, spacious view that feels less like looking through an instrument and more like floating in space.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eArgon-Purged for Lifetime Waterproofing\u003c\/h3\u003e\n\u003cp\u003eUnlike standard eyepieces, the Explore Scientific 68° series is fully sealed and purged with inert Argon gas. This process makes the eyepiece completely waterproof, preventing internal fogging in high humidity and protecting the internal lens elements from dust, fungus, and cleaning solutions for the life of the product.\u003c\/p\u003e\n\u003cp\u003eArgon is chosen over the more common Nitrogen because its larger atomic structure is less prone to diffusing through seals over time. This ensures the dry, sealed environment remains pristine, protecting your investment and guaranteeing consistent, clear views regardless of observing conditions. Every eyepiece is factory-tested to be waterproof, withstanding full immersion without failure.\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\u003eParfocal and Long Eye Relief Design\u003c\/h3\u003e\n\u003cp\u003eThe 20mm eyepiece is designed to be parfocal with other eyepieces in the Explore Scientific 68° series. This means you can switch between different focal lengths in the series with little to no refocusing, saving valuable observing time and making it easier to compare views at different magnifications.\u003c\/p\u003e\n\u003cp\u003eA generous amount of eye relief and a foldable, soft silicone rubber eyecup enhance observer comfort, which is critical during long nights at the telescope. This design allows you to relax your eye and see the entire 68° field with ease, a significant benefit for observers who wear 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\u003eChoosing Your Focal Length: 20mm vs. 24mm in the 68° Series\u003c\/h3\u003e\n\u003cp\u003eWithin the 1.25\" 68° series, the 20mm and 24mm focal lengths serve different primary purposes. The best choice depends on your telescope and typical targets.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eES 68° 24mm:\u003c\/strong\u003e This eyepiece delivers a wider true field of view and lower magnification. It excels as a \"finder\" eyepiece in Schmidt-Cassegrains and is ideal for framing the largest nebulae and star clusters, like the Pleiades (M45).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eES 68° 20mm:\u003c\/strong\u003e The 20mm provides more magnification, darkening the sky background and increasing image scale. This makes it better for resolving detail in medium-sized objects, such as the Hercules Cluster (M13) or the Dumbbell Nebula (M27), without sacrificing too much field of view.\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 does \"Argon-purged\" mean for the Explore Scientific 68° 20mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eArgon-purging\u003c\/strong\u003e means the air inside the eyepiece has been replaced with dry, inert argon gas and then sealed. This makes the Explore Scientific 68° 20mm eyepiece completely waterproof and prevents internal fogging, dust intrusion, and the growth of fungus on the lenses. It ensures the eyepiece performs reliably in any weather condition and lasts a lifetime.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Explore Scientific 68° 20mm perform on the Orion Nebula (M42) in an 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 8\" f\/10 SCT (2032mm focal length), the ES 68° 20mm eyepiece provides 102x magnification. This is an excellent power for framing the entire Orion Nebula (M42), from the bright Trapezium star cluster at its core to the faint, sweeping outer arms. The 68° field will feel immersive and provide a dark sky background to enhance nebulosity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 20mm focal length good for planetary viewing with the ES 68° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 20mm focal length provides medium power, which is great for locating planets and viewing them in context with their moons, such as Jupiter and the Galilean satellites. For detailed observation of planetary features like Jupiter's Great Red Spot or Saturn's Cassini Division, you would typically use a much shorter focal length eyepiece (e.g., 6mm to 9mm) or a Barlow lens with the 20mm eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of a \"parfocal\" eyepiece like the ES 68° 20mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003eparfocal eyepiece\u003c\/strong\u003e requires little to no refocusing when swapped with other eyepieces in the same series. The main benefit is speed and convenience. When you switch from the 20mm to another ES 68° eyepiece, your target will snap back into focus almost instantly, saving you from having to hunt for focus in the dark.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need to wear my glasses with the Explore Scientific 68° 20mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Explore Scientific 68° 20mm features long eye relief, which allows you to hold your eye at a comfortable distance from the lens and still see the entire field of view. This design is ideal for observers who wear glasses to correct for astigmatism. For those who don't, the included foldable rubber eyecup helps maintain the correct eye position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 68° 20mm eyepiece a good all-around choice?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, for many telescopes, a 20mm focal length is an excellent workhorse for deep-sky observing. It provides enough magnification to resolve details in many galaxies and nebulae while still offering a wide enough true field of view to easily locate objects. It's a versatile choice that bridges the gap between low-power scanning and high-power planetary 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\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e8122570105304\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":44967200522525,"sku":"ES-EPWP6820-01","price":153.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-68-deg-20mm-Waterproof-Eyepiece-EPWP6820-01-1__68888.1594240354.1280.1280.jpg?v=1684338866"},{"product_id":"explore-scientific-68-24mm-waterproof-eyepiece-1-25","title":"Explore Scientific 68° 24mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e24mm Focal Length\u003c\/li\u003e\n\u003cli\u003e68° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eArgon-Purged Waterproof Construction\u003c\/li\u003e\n\u003cli\u003eParfocal with 68° Series Eyepieces\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\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 68° 24mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 68° 24mm Waterproof Eyepiece delivers an immersive 68° apparent field of view in a rugged, all-weather 1.25\" format. Its 24mm focal length provides a versatile medium-low power that is ideal for framing large deep-sky objects, while its advanced optical design maintains high contrast and a flat field from edge to edge. By sealing the optical housing with inert Argon gas, this eyepiece guarantees protection against internal fogging, dust, and moisture, ensuring consistent views regardless of observing 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 24mm 68° Full-Immersion Experience\u003c\/h3\u003e\n\u003cp\u003eWith a 68° apparent field, this eyepiece provides a viewing window that feels expansive and immersive, a significant step up from standard Plössl designs. The 24mm focal length hits a sweet spot for many telescopes, offering wide true fields of view perfect for locating objects and observing large star clusters like the Pleiades (M45) or extended nebulae like the Orion Nebula (M42). Using low dispersion and high refractive index glasses, the design is optimized to produce sharp, high-resolution images across a superiorly flat 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\u003eArgon-Purged: A 100% Waterproof Optical Chamber\u003c\/h3\u003e\n\u003cp\u003eThe defining feature of this eyepiece is its sealed, Argon-purged body. Unlike nitrogen-purged optics, Argon's larger atoms are less prone to diffusing through seals over time, offering superior long-term protection. This process creates a dry, inert internal environment that completely prevents internal fogging during rapid temperature drops and stops the growth of fungus or the intrusion of fine dust. The trade-off for this durability is that the eyepiece is not user-serviceable, but the benefit is pristine internal elements that are protected for the life of the instrument.\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\u003eParfocal Design for Seamless Magnification Changes\u003c\/h3\u003e\n\u003cp\u003eAs part of the Explore Scientific 68° Series, this 24mm eyepiece is parfocal with its siblings. This means that when you switch between different focal lengths in the series, the focus point remains nearly identical, requiring little to no adjustment. This is a critical time-saver in the field, allowing you to change magnification to study different details of an object without losing focus and having to start over. The eyepiece also features long eye relief and a foldable rubber eyecup, enhancing comfort for all observers, including those 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\u003eExplore Scientific 24mm 68° vs. Tele Vue 24mm Panoptic\u003c\/h3\u003e\n\u003cp\u003eThe most common comparison for this eyepiece is the Tele Vue 24mm Panoptic, which is often considered the benchmark in this class.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTele Vue 24mm Panoptic:\u003c\/strong\u003e The Panoptic is renowned for its exceptional edge-to-edge sharpness and contrast. It is lighter than the Explore Scientific model and sets the standard for optical correction in a 68° eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific 24mm 68°:\u003c\/strong\u003e This eyepiece offers a directly comparable 68° field of view and excellent optical characteristics at a competitive price. Its key advantage is the Argon-purged waterproof construction, making it the superior choice for observers in humid or dew-prone climates, or for anyone prioritizing ruggedness and environmental durability.\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 24mm 68° eyepiece \"waterproof\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe eyepiece body is fully sealed and purged with inert \u003cstrong\u003eArgon gas\u003c\/strong\u003e. This dry gas replaces normal air, preventing moisture from ever entering the optical housing. This makes it impervious to internal fogging, humidity, and contaminants like dust or fungus, ensuring the internal lenses remain clean indefinitely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Explore Scientific 24mm 68° perform in an 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 8\" f\/10 Schmidt-Cassegrain with a 2032mm focal length, the Explore Scientific 24mm 68° eyepiece will provide \u003cstrong\u003e85x magnification\u003c\/strong\u003e and a true field of view of approximately 0.8°. This is an excellent magnification for framing the entire Andromeda Galaxy (M31), viewing the full extent of the Dumbbell Nebula (M27), or resolving 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\"\u003eIs the Explore Scientific 24mm 68° a good choice for viewing large open clusters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an ideal choice. The combination of a wide 68° apparent field and a 24mm focal length is perfect for framing large open clusters. In most telescopes, it will allow you to see objects like the Beehive Cluster (M44) or the Pleiades (M45) in their entirety within a single, sharp field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"parfocal\" mean for the Explore Scientific 68° eyepiece series?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eParfocal\u003c\/strong\u003e means that all eyepieces in the Explore Scientific 68° series share a nearly identical focal plane. When you swap from the 24mm to another eyepiece in the series (e.g., the 16mm or 34mm), your telescope will remain in focus. This saves significant time and effort, as you won't need to make major adjustments to the focuser each time you change magnification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Explore Scientific 24mm 68° compare to a standard 25mm Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Explore Scientific 24mm 68° eyepiece offers a dramatically wider and more immersive view. A standard Plössl has an apparent field of view around 50°-52°, while the 68° field of this eyepiece feels like looking out of a window rather than through a tunnel. It also features superior optical coatings and the significant advantage of being waterproof.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 1.25\" filters with the Explore Scientific 24mm 68° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 1.25\" barrel of the Explore Scientific 24mm 68° eyepiece is threaded to accept standard 1.25\" astronomy filters, such as moon filters, light pollution filters, or nebula filters.\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\u003e24mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e68°\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\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eArgon-Purged, Waterproof\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries Feature\u003c\/td\u003e\n\u003ctd\u003eParfocal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e8122570105236\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\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":44967200555293,"sku":"ES-EPWP6824-01","price":153.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-68-deg-24mm-Waterproof-Eyepiece-EPWP6824-01-1__76659.1647796027.1280.1280.jpg?v=1684338869"},{"product_id":"explore-scientific-68-28mm-waterproof-eyepiece-2","title":"Explore Scientific 68° 28mm Waterproof Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e28mm Focal Length\u003c\/li\u003e\n\u003cli\u003e68° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eArgon-Purged Waterproof Construction\u003c\/li\u003e\n\u003cli\u003eLong Eye Relief with Foldable Eyecup\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\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 68° 28mm Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 68° 28mm eyepiece delivers a wide, immersive viewing experience in a rugged, fully waterproof 2\" barrel design. Its 28mm focal length provides low-to-medium power views ideal for scanning star fields, while the 68° apparent field of view feels expansive without being overly demanding on telescope optics.\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 68° Flat-Field Window on the Sky\u003c\/h3\u003e\n\u003cp\u003eUsing a combination of low-dispersion and high-refractive-index glasses, this 28mm eyepiece is optimized for high contrast and resolution across its entire 68° apparent field. The result is a superior flat field, keeping stars sharp from the center to the edge, a critical feature when observing dense open clusters or extended nebulae.\u003c\/p\u003e\n\u003cp\u003eThe multi-layer coatings on all air-to-glass surfaces maximize light transmission, ensuring that the faintest stars and subtle details in galaxies are not lost. This optical design makes the eyepiece a versatile workhorse for everything from sweeping the Milky Way to framing large targets like the Andromeda Galaxy (M31).\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\u003eArgon-Purged for a Lifetime of Clarity\u003c\/h3\u003e\n\u003cp\u003eExplore Scientific seals this eyepiece and purges the internal volume with inert argon gas, making it completely waterproof and internally fog-proof. To ensure this seal, every eyepiece is tested by submerging it in one meter of water for 30 minutes. This process prevents the growth of internal fungus and protects the coatings from contaminants over the lifetime of the eyepiece.\u003c\/p\u003e\n\u003cp\u003eArgon is chosen over nitrogen for its larger atomic size, making it less likely to leak through seals over time. Its superior inertness also prevents chemical reactions with internal components, extending longevity and ensuring the optics remain as pristine as the day they were assembled, regardless of dew, humidity, or rapid temperature drops.\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\u003eLong Eye Relief and Parfocal Convenience\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece features long eye relief, providing comfortable views for all observers, including those who wear glasses. A soft, foldable silicone rubber eyecup allows you to set the perfect eye distance to see the full field of view while blocking stray light, which is critical for detecting faint details at the limit of vision.\u003c\/p\u003e\n\u003cp\u003eAs part of an integrated eyepiece series, the 68° 28mm is designed to be nearly parfocal with other eyepieces in the line. This minimizes the amount of refocusing needed when switching between different focal lengths, saving valuable observing time and making comparisons between views much more efficient.\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 68° 28mm vs. the 82° Series: Field of View and Eye Placement\u003c\/h3\u003e\n\u003cp\u003eWhile the Explore Scientific 82° series offers a more expansive \"spacewalk\" effect, the 68° series presents a different set of advantages. The primary trade-off is the apparent field of view against eye comfort and optical tolerance.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific 82° Series Advantage:\u003c\/strong\u003e The wider 82° field provides a more immersive sensation and can fit slightly larger objects into the view at a similar magnification. It is often the choice for observers prioritizing the widest possible apparent field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific 68° 28mm Advantage:\u003c\/strong\u003e The 68° field is significantly less demanding on telescope optics, showing better edge-of-field performance in fast Newtonians. It also typically features more comfortable eye relief, making it easier to hold the full field of view, especially for eyeglass wearers or those new to wide-field eyepieces.\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\"\u003eWhy is Argon purging important for the ES 68° 28mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eArgon purging\u003c\/strong\u003e makes the eyepiece fully waterproof and internally fog-proof. This protects the delicate internal lens elements and coatings from moisture, fungus, and dust for the life of the eyepiece. Because Argon atoms are larger than Nitrogen, they are less likely to escape the seals over time, ensuring a superior, long-lasting dry environment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 68° 28mm eyepiece parfocal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this eyepiece is designed to be nearly \u003cstrong\u003eparfocal\u003c\/strong\u003e with other eyepieces in the Explore Scientific 68° and 62° series. This means you will only need to make minimal focus adjustments when switching between different focal lengths in the series, which is a significant convenience during an observing session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the ES 68° 28mm perform for finding galaxies like M81 and M82 in an 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 8\" f\/10 SCT with a 2032mm focal length, the 28mm eyepiece yields 72.5x magnification and a true field of view of just under 1 degree. This is an ideal magnification and field size for framing both Bode's Galaxy (M81) and the Cigar Galaxy (M82) together, making it an excellent eyepiece for locating and observing galaxy groups.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ES 68° 28mm a good choice for large open clusters like the Pleiades (M45) in a fast Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent choice. In a 10\" f\/4.7 Dobsonian, the 28mm eyepiece provides 43x magnification and a wide true field of view. The 68° apparent field is also less demanding on the fast optics compared to an 82° or 100° eyepiece, resulting in sharper stars across the field, which is critical for appreciating the beauty of large clusters like the Pleiades (M45).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI don't wear glasses. Will the long eye relief of the ES 68° 28mm be a problem?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe long eye relief is beneficial for everyone, not just eyeglass wearers. To manage the distance, the eyepiece includes a \u003cstrong\u003efoldable rubber eyecup\u003c\/strong\u003e. By extending the eyecup, you can comfortably rest your eye at the correct distance to see the entire 68° field without experiencing blackouts or \"kidney-beaning.\"\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 a 68° field of view in the 28mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 68° apparent field of view provides a significant immersive upgrade over standard Plössl (50°) or Kellner eyepieces without the bulk, weight, and optical demands of 82° or 100° designs. It strikes a balance, offering a wide, comfortable window on the sky that performs well in a wide variety of telescopes.\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\u003e28mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e68°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eYes, Argon-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257010516\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\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":44967200588061,"sku":"ES-EPWP6828-01","price":237.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-68-deg-28mm-Waterproof-Eyepiece-EPWP6828-01-1__36888.1594240355.1280.1280.jpg?v=1684338872"},{"product_id":"explore-scientific-68-34mm-waterproof-eyepiece-2","title":"Explore Scientific 68° 34mm Waterproof Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e34mm Focal Length\u003c\/li\u003e\n\u003cli\u003e68° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" Diameter Barrel\u003c\/li\u003e\n\u003cli\u003eArgon-Purged Waterproof Construction\u003c\/li\u003e\n\u003cli\u003eParfocal with other 68° Series Eyepieces\u003c\/li\u003e\n\u003cli\u003eLong Eye Relief for Eyeglass Wearers\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 68° 34mm Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 68° 34mm Waterproof Eyepiece delivers an immersive, wide-field view in a 2-inch barrel format. With a 34mm focal length, this eyepiece provides low-power, expansive views of the sky, framed within a generous 68° apparent field of view. Its fully sealed, Argon-purged body is tested to be waterproof at a depth of 1 meter for 30 minutes, ensuring it remains internally pristine regardless of observing 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\u003eA 68° Immersive Field in a 34mm Focal Length\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece is engineered to produce a wide, flat, and high-contrast window into the cosmos. The 34mm focal length yields very low magnification, making it an ideal \"finder\" eyepiece for locating faint targets and an exceptional instrument for observing large-scale objects. The 68° apparent field of view is wide enough to frame the entirety of the Andromeda Galaxy (M31) or the Veil Nebula complex in most long-focal-length telescopes.\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\u003eArgon-Purged: Waterproof to 1 Meter for 30 Minutes\u003c\/h3\u003e\n\u003cp\u003eDew and humidity are constant challenges in astronomy, but this eyepiece is built to withstand them. The optical housing is purged of all air and filled with inert Argon gas before being sealed. This process makes the eyepiece impervious to internal fogging, fungus growth, and contaminants, and it has been factory-tested by submersion in 1 meter of water for 30 minutes. The dry, sealed environment means you can move from a warm house to a cold field without fear of internal condensation clouding your 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\u003eParfocal Design and Long Eye Relief for Observer Comfort\u003c\/h3\u003e\n\u003cp\u003ePracticality is central to the 68° Series design. This 34mm model is parfocal with its siblings, meaning you can swap between different focal lengths in the series with little to no refocusing required. It also features long eye relief and a soft, foldable silicone eyecup, providing comfortable views for all observers, including those who must wear eyeglasses to correct for astigmatism.\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 68° 34mm vs. ES 82° 30mm: Field of View vs. Eye Relief\u003c\/h3\u003e\n\u003cp\u003eWhen choosing a low-power eyepiece, a common comparison is between the 68° series and the wider 82° series. While the 82° eyepieces offer a more expansive \"spacewalk\" apparent field, the 68° series provides a critical advantage in observer comfort.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEye Relief:\u003c\/strong\u003e The 68° 34mm eyepiece has significantly longer eye relief, making it a superior choice for observers who wear glasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrue Field:\u003c\/strong\u003e Despite the smaller apparent field, the longer 34mm focal length means the true field of view is very comparable to a 30mm 82° eyepiece. You are not sacrificing much sky.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImmersion vs. Comfort:\u003c\/strong\u003e The choice comes down to priorities. The 82° series offers maximum immersion, while the 68° series provides a more relaxed, comfortable view without giving up the wide-field experience.\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 68° 34mm eyepiece \"waterproof\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe eyepiece is fully sealed and purged with inert \u003cstrong\u003eArgon gas\u003c\/strong\u003e. This dry, pressurized environment prevents moisture, dew, and dust from ever entering the optical housing. Explore Scientific tests each eyepiece by submerging it in 1 meter of water for 30 minutes to guarantee the integrity of the seals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the ES 68° 34mm perform for finding objects in an f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt excels in this role. In a typical 8-inch f\/10 Schmidt-Cassegrain Telescope, the 34mm focal length provides a low magnification (around 60x) and a wide true field of view. This makes it much easier to star-hop and locate faint deep-sky objects compared to higher-power eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does it mean for the ES 68° 34mm eyepiece to be \"parfocal\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBeing \u003cstrong\u003eparfocal\u003c\/strong\u003e means this eyepiece shares a common focal plane with other eyepieces in the Explore Scientific 68° series. When you switch from one 68° eyepiece to another, the image will remain nearly in focus, requiring only a minimal adjustment. This saves significant time and effort during an observing session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 34mm focal length of this ES 68° eyepiece a good choice for viewing large objects like the Pleiades (M45)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent choice. The 34mm focal length is designed to provide a wide true field of view that can easily frame large open star clusters like the Pleiades (M45) or sprawling emission nebulae like the North American Nebula (NGC 7000) in a single view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eShould I choose this 68° 34mm eyepiece or an 82° series eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eChoose the \u003cstrong\u003e68° 34mm\u003c\/strong\u003e if you prioritize observer comfort, especially if you wear eyeglasses, as it offers longer eye relief. Choose an 82° eyepiece if your top priority is the most immersive, \"spacewalk\" viewing experience possible and you do not require long eye relief.\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 Explore Scientific 68° 34mm sufficient for eyeglass wearers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Explore Scientific 68° series is known for its \u003cstrong\u003elong eye relief\u003c\/strong\u003e. This allows observers who need to wear glasses for astigmatism correction to see the entire 68° field of view comfortably without having to press their glasses against the lens.\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\u003e34mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e68°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eYes, Argon-Purged (Tested to 1 meter for 30 minutes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParfocal\u003c\/td\u003e\n\u003ctd\u003eYes (with ES 68° Series)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003eLong\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257010509\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\"\u003eExplore Scientific 68° 34mm 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":44967200620829,"sku":"ES-EPWP6834-01","price":307.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-68-deg-34mm-Waterproof-Eyepiece-EPWP6834-01-1__90379.1594240355.1280.1280.jpg?v=1684338875"},{"product_id":"explore-scientific-68-40mm-waterproof-eyepiece-2","title":"Explore Scientific 68° 40mm Waterproof Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e40mm Focal Length\u003c\/li\u003e\n\u003cli\u003e68° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eArgon-Purged Waterproof Construction\u003c\/li\u003e\n\u003cli\u003eLong Eye Relief for Eyeglass Wearers\u003c\/li\u003e\n\u003cli\u003eParfocal with other Explore Scientific 68° Eyepieces\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 68° 40mm Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n      \u003cp\u003eThe Explore Scientific 68° 40mm Waterproof Eyepiece delivers a fully immersive 68° apparent field of view in a 2-inch barrel, designed for sweeping low-power views of the deep sky. Its argon-purged body is waterproof-tested for 30 minutes at a depth of one meter, ensuring complete protection from dew, humidity, and accidental exposure to the elements.\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 40mm, 68° Wide-Field View: Maximum Context in a 2\" Barrel\u003c\/h3\u003e\n      \u003cp\u003eWith a 40mm focal length, this eyepiece provides very low magnification, making it an ideal tool for locating objects and framing the largest deep-sky targets. The expansive 68° apparent field of view creates a \"spacewalk\" experience, allowing you to see large structures like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000) in their entirety within many long-focal-length telescopes.\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\u003eArgon-Purged \u0026amp; Waterproof: Sealed for 30 Minutes at 1 Meter\u003c\/h3\u003e\n      \u003cp\u003eBy purging the optical housing with inert argon gas, Explore Scientific prevents the growth of internal fungus and eliminates fogging during nights with heavy dew. Unlike nitrogen, the larger argon atoms are less likely to leak through seals over time, ensuring the eyepiece remains pristine for years. This sealed environment means you can clean the eyepiece without risk of solvents seeping between lens elements, a critical feature for maintaining optical contrast.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eTested Immersion:\u003c\/strong\u003e Every eyepiece is tested to be waterproof for 30 minutes in one meter of water, guaranteeing performance in any observing condition.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eInert Environment:\u003c\/strong\u003e The argon-purged interior protects delicate multi-coatings from degradation caused by moisture and contaminants.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eThermal Stability:\u003c\/strong\u003e Argon's lower thermal conductivity helps buffer the optics against rapid temperature drops, reducing the risk of thermal shock.\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\u003eParfocal Design \u0026amp; Long Eye Relief: A Focus on Observer Comfort\u003c\/h3\u003e\n      \u003cp\u003eThis eyepiece features long eye relief and a soft, foldable silicone eyecup, making it comfortable for all observers, including those who wear eyeglasses. It is also parfocal with other eyepieces in the Explore Scientific 68° series, meaning you can switch between different magnifications with little to no refocusing required. This convenience saves valuable time at the telescope, keeping your target sharp as you change your view.\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 40mm 68° vs. TeleVue 55mm Plössl: Apparent vs. True Field\u003c\/h3\u003e\n      \u003cp\u003eWhen choosing a low-power 2\" eyepiece, it's critical to understand the trade-offs between apparent field of view (AFOV) and true field of view (TFOV).\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eTeleVue 55mm Plössl's Advantage:\u003c\/strong\u003e The 55mm Plössl is designed to produce the widest possible TFOV in a 2\" barrel. It's the ultimate \"finder\" eyepiece, showing the largest possible patch of sky at the lowest magnification, but with a narrower 50° AFOV.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eExplore Scientific 40mm's Advantage:\u003c\/strong\u003e The ES 40mm prioritizes an immersive viewing experience with its wide 68° AFOV. While its TFOV is slightly smaller than the 55mm Plössl's, the \"picture window\" effect is much more pronounced. Additionally, its waterproof construction offers a level of environmental protection the Plössl does not.\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\"\u003eWhy choose the Explore Scientific 40mm 68° eyepiece for an f\/10 SCT?\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, the Explore Scientific 40mm 68° eyepiece yields 50x magnification and a true field of over 1.3 degrees—wide enough to frame the entire Pleiades star cluster (M45). It effectively turns the narrow field of an SCT into a rich-field instrument for sweeping the Milky Way.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the waterproofing on the Explore Scientific 40mm 68° help during a dewy night?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe primary benefit is the prevention of \u003cstrong\u003einternal fogging\u003c\/strong\u003e. On humid nights, temperature changes can cause moisture to condense on interior lens surfaces of unsealed eyepieces, rendering them useless until they dry out. The argon-purged, sealed body of the Explore Scientific 40mm 68° eyepiece completely prevents this, ensuring a clear view all night long.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 40mm 68° good for framing large objects like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, this is an excellent choice for that purpose. In many amateur telescopes with focal lengths from 1000mm to 2000mm, the Explore Scientific 40mm 68° eyepiece provides a field of view wide enough to capture the Andromeda Galaxy (M31) and its satellite galaxies M32 and M110 in a single, immersive view.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"parfocal\" mean for the Explore Scientific 40mm 68° eyepiece?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cstrong\u003eParfocal\u003c\/strong\u003e means that this eyepiece requires little to no refocusing when swapped with other eyepieces in the same Explore Scientific 68° series. This is a significant convenience, as it allows you to change magnifications quickly without losing focus on your target, which is especially useful when tracking moving objects or sharing views at a star party.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need an extension tube to reach focus with the Explore Scientific 40mm 68° eyepiece?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIt depends on your telescope's focuser travel. Long focal length eyepieces like this 40mm model sometimes require more \"out-travel\" than some focusers provide. If you cannot reach focus, a simple 2\" barrel extender is all that is needed to move the eyepiece to the correct focal plane.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 68° field of view in the Explore Scientific 40mm 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 has an apparent field of view around 50°-52°. The 68° field of the Explore Scientific eyepiece feels significantly wider and more immersive, providing a \"picture window\" view of the sky rather than looking through a narrow tube. This makes navigating among the stars and observing large nebulae a more engaging experience.\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\u003e40mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e68°\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eArgon-Purged, Waterproof\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257010493\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  \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":44967200653597,"sku":"ES-EPWP6840-01","price":433.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-68-deg-40mm-Waterproof-Eyepiece-EPWP6840-01-1__53001.1594240356.1280.1280.jpg?v=1684338878"},{"product_id":"explore-scientific-92-12mm-long-eye-relief-waterproof-eyepiece-2","title":"Explore Scientific 92° 12mm Long Eye Relief Waterproof Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e12mm Focal Length\u003c\/li\u003e\n\u003cli\u003e92° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eLong Eye Relief for Viewing Comfort\u003c\/li\u003e\n\u003cli\u003eArgon-Purged Waterproof 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\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific 92° 12mm Long Eye Relief Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 92° 12mm Eyepiece redefines wide-field observing with its hyper-wide 92° apparent field of view. This 12mm ocular fits any 2-inch focuser, providing high power for detailed views of planets and small deep-sky objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 92° Hyper-Wide Apparent Field of View\u003c\/h3\u003e\n\u003cp\u003eWith an apparent field of view of 92°, this eyepiece delivers an immersive, 'spacewalk' experience that makes you feel like you're floating in the cosmos. This expansive view not only makes finding celestial objects easier but also keeps them in the field of view longer in non-driven telescopes like Dobsonians, reducing the need for constant nudging.\u003c\/p\u003e\n\u003cp\u003eThe wide canvas is particularly effective for framing moderately sized objects like the Hercules Cluster (M13) or the Lagoon Nebula (M8) in their entirety. It also aids in the use of averted vision, allowing you to place faint targets on the more sensitive periphery of your retina to tease out subtle details.\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\u003eLong Eye Relief in a 12mm Design\u003c\/h3\u003e\n\u003cp\u003eHigh-power, wide-field eyepieces often come with the trade-off of short, uncomfortable eye relief. Explore Scientific has engineered the 92° 12mm eyepiece with long eye relief, ensuring you can see the entire 92° field comfortably without pressing your eye against the lens. This is a critical feature for eyeglass wearers, who can observe with their glasses on and still take in the full, expansive 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\u003eA 2-Inch Waterproof Eyepiece: Argon-Purged for Longevity\u003c\/h3\u003e\n\u003cp\u003eDesigned for real-world observing conditions, the 92° 12mm eyepiece is fully waterproof. The optical housing is sealed and purged with inert argon gas, which prevents the formation of internal fogging during sudden temperature drops. This process also protects the internal lens coatings from moisture and fungus, ensuring the eyepiece delivers high-contrast views for years.\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 92° vs. 82° Series: The Extra 10 Degrees\u003c\/h3\u003e\n\u003cp\u003eWhile the 82° field of view has long been a standard for \"ultra-wide\" eyepieces, the 92° series pushes that boundary for a more profound sense of immersion. The key difference lies in the observational experience.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e82° Field of View:\u003c\/strong\u003e An 82° eyepiece provides a generous window into space, a significant step up from standard Plössls. It's a workhorse field of view that balances width with optical correction and cost.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e92° Field of View:\u003c\/strong\u003e The 92° field is so large that it can fill your eye's peripheral vision, creating the sensation of having no eyepiece at all. This \"spacewalk\" effect is what defines the 92° series, offering a more engaging and captivating view, especially on large, diffuse objects.\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 92° 12mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 12mm focal length provides medium-to-high magnification, making it ideal for resolving details in globular clusters like M13, observing planetary nebulae such as the Ring Nebula (M57), and framing smaller galaxies like the Whirlpool Galaxy (M51). In a telescope with a 2000mm focal length, it yields 167x magnification, perfect for planetary observing on nights of good seeing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 92° field of view on the 12mm eyepiece help with a Dobsonian telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a manual telescope like a Dobsonian, objects drift across the field of view due to Earth's rotation. The hyper-wide 92° field of the Explore Scientific 12mm eyepiece means an object will take significantly longer to drift from one side to the other compared to a standard eyepiece. This allows for longer, more relaxed observations at high power before you need to reposition the telescope.\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 92° 12mm eyepiece with eyeglasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. This eyepiece is specifically designed with \u003cstrong\u003elong eye relief\u003c\/strong\u003e, a feature that allows eyeglass wearers to position their eye at a comfortable distance from the lens and still see the entire 92° apparent field of view. This makes it an excellent choice for observers with astigmatism.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"Argon-Purged\" mean for the Explore Scientific 12mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\"Argon-Purged\" means the interior of the eyepiece has been filled with inert argon gas and sealed. This process serves two purposes:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIt prevents internal optics from fogging up when moving the eyepiece from a warm house to a cold outdoor environment.\u003c\/li\u003e\n\u003cli\u003eIt protects the delicate lens coatings from long-term degradation due to moisture, ensuring a lifetime of crisp, high-contrast 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\"\u003eWill I need a coma corrector with the 92° 12mm eyepiece in a fast Newtonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn fast telescopes (f\/5 or lower), hyper-wide eyepieces like the Explore Scientific 92° 12mm will reveal the coma inherent in the telescope's optics, causing stars at the edge of the field to appear elongated. For the sharpest possible views across the entire 92° field, using a high-quality coma corrector is strongly recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy choose the Explore Scientific 92° 12mm eyepiece over a zoom eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile a zoom eyepiece offers convenience, a fixed focal length eyepiece like this 12mm model is optically simpler. This generally results in a wider apparent field of view (92° vs. typically 40°-60° in a zoom), better light transmission, and higher contrast, providing a more immersive and detailed image at its specific magnification.\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\u003e12mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e92°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003eLong\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eYes, Argon-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257017386\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\"\u003eExplore Scientific 92° 12mm Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\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":44967202259229,"sku":"ES-EPWP9212-01","price":433.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-92-deg-12mm-Long-Eye-Relief-Waterproof-Eyepiece-EPWP9212-01-1__04558.1594240356.1280.1280.jpg?v=1684338774"},{"product_id":"explore-scientific-92-17mm-long-eye-relief-waterproof-eyepiece-2","title":"Explore Scientific 92° 17mm Long Eye Relief Waterproof Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e17mm Focal Length\u003c\/li\u003e\n\u003cli\u003e92° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eLong Eye Relief Design\u003c\/li\u003e\n\u003cli\u003eArgon-Purged Waterproof 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 92° 17mm Long Eye Relief Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 92° 17mm eyepiece delivers a hyper-wide 92° apparent field of view in a rugged, waterproof 2\" barrel. Its 17mm focal length provides the medium-high magnification needed to resolve detail in globular clusters and galaxies, while the vast field makes finding and tracking your targets effortless.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 92° Window on the Universe at 17mm\u003c\/h3\u003e\n\u003cp\u003eWith an apparent field of view of 92°, this eyepiece creates a true \"spacewalk\" experience, dissolving the boundary between you and the night sky. The 17mm focal length is ideal for resolving individual stars in globular clusters like the Hercules Cluster (M13) or revealing the faint structure in galaxies like the Whirlpool Galaxy (M51).\u003c\/p\u003e\n\u003cp\u003eThis combination of magnification and field width frames celestial objects in a way that narrower designs cannot, providing context and an immersive sense of scale. The generous long eye relief design further enhances comfort during long observing sessions, reducing eye strain as you take in the expansive 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\u003eArgon-Purged for a Lifetime of Dew-Free Views\u003c\/h3\u003e\n\u003cp\u003eUnlike standard eyepieces, the Explore Scientific 92° 17mm is hermetically sealed and purged with inert argon gas. This process makes the eyepiece completely waterproof, preventing internal fogging when moving from a warm environment to cold outdoor temperatures—a common issue that can end an observing session.\u003c\/p\u003e\n\u003cp\u003eThis sealed construction also protects the delicate internal multi-coatings from dust, fungus, and moisture for the life of the eyepiece. You get consistent, high-contrast views every time you observe, without worrying about internal contamination or dew.\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\u003eHow 92° Benefits Non-Driven Scopes\u003c\/h3\u003e\n\u003cp\u003eThe vast 92° field of view is a significant advantage for users of non-driven telescopes like Dobsonians. An object will remain in the field of view for a remarkably long time before your telescope needs to be nudged, allowing for more relaxed, uninterrupted study of faint details.\u003c\/p\u003e\n\u003cp\u003eThis wide expanse of sky also aids in the use of averted vision. When hunting for faint objects like the Veil Nebula (NGC 6960), the extra space around your target makes it easier to look slightly to the side, placing the image on a more light-sensitive part of your retina and revealing details that are invisible to direct vision.\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 92° 17mm vs. Tele Vue Nagler 17mm: Field and Durability\u003c\/h3\u003e\n\u003cp\u003eThe Tele Vue Nagler series is a benchmark for sharp-to-the-edge performance. The Explore Scientific 92° 17mm, however, offers two distinct advantages for the field observer.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWider Apparent Field:\u003c\/strong\u003e The 92° apparent field of the Explore Scientific is significantly more immersive than the 82° field of the 17mm Nagler Type 4, creating a more dramatic viewing experience.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWaterproof Construction:\u003c\/strong\u003e The argon-purged, sealed design of the ES 92° eyepiece provides a level of environmental protection against internal dew and contaminants that is not a standard feature of the Nagler line.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor observers prioritizing the widest possible view and all-weather durability, the Explore Scientific 92° 17mm presents a compelling choice.\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\"\u003eWhat is the main advantage of the Explore Scientific 92° 17mm eyepiece's field of view?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage of the \u003cstrong\u003e92° apparent field of view\u003c\/strong\u003e is the incredibly immersive, \"spacewalk\" experience it provides. For users of non-driven telescopes like Dobsonians, it also means objects stay in the field of view much longer, requiring less frequent manual adjustments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is an argon-purged eyepiece like the ES 92° 17mm better for field use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn argon-purged and sealed eyepiece is \u003cstrong\u003ecompletely waterproof\u003c\/strong\u003e. This prevents internal optics from fogging up when you take it from a warm house into the cold night air. It also permanently seals out dust, moisture, and fungus, protecting the lens coatings and ensuring high-contrast views for years.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the ES 92° 17mm perform on globular clusters like M13 in an 8\" f\/6 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn an 8\" f\/6 Dobsonian (1219mm focal length), the 17mm eyepiece yields about 72x magnification. This is an excellent power for viewing the Hercules Cluster (M13), providing enough magnification to resolve its dense core into individual stars while the 92° field frames the cluster beautifully against a dark sky background.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 17mm focal length of this ES 92° eyepiece a good choice for the Orion Nebula (M42) in a 10\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a 10\" f\/10 SCT (2540mm focal length), this eyepiece provides 149x magnification. This is a relatively high-power view that will not fit the entire Orion Nebula (M42) in the field. However, it is an exceptional choice for examining fine details within the nebula's core, easily resolving the four main stars of the Trapezium (Theta Orionis) and the intricate cloud structures surrounding them.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 92° 17mm eyepiece suitable for eyeglass wearers?\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 for enhanced viewing comfort. This generally allows observers who wear glasses for astigmatism to see most or all of the 92° field of view without having to remove their glasses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Explore Scientific 92° 17mm compare to an 82° eyepiece at the same focal length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ES 92° 17mm provides a noticeably larger and more immersive apparent field than an 82° eyepiece. This creates a more compelling visual experience and allows celestial objects to drift through the field more slowly, which is a significant benefit for observers with manual telescopes.\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\u003e17mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e92°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257017379\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\"\u003eExplore Scientific 92° 17mm 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\u003cp\u003eNo manual or software is available for this product.\u003c\/p\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":44967202291997,"sku":"ES-EPWP9217-01","price":517.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-92-deg-17mm-Long-Eye-Relief-Waterproof-Eyepiece-EPWP9217-01-1__97519.1594240356.1280.1280.jpg?v=1684338778"},{"product_id":"explore-scientific-68-16mm-waterproof-eyepiece-1-25","title":"Explore Scientific 68° 16mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e16mm Focal Length\u003c\/li\u003e\n\u003cli\u003e68° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eWaterproof \u0026amp; Argon-Purged\u003c\/li\u003e\n\u003cli\u003eParfocal with 68° Series Eyepieces\u003c\/li\u003e\n\u003cli\u003eLong Eye Relief\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 68° 16mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 68° 16mm Waterproof Eyepiece delivers an immersive, wide-field view in a rugged, fully-sealed 1.25\" barrel. Its 16mm focal length provides useful magnification for resolving details in celestial objects, framed by a generous 68° apparent field of view. This eyepiece is fully Argon-purged, making it impervious to internal fogging or contaminants regardless of observing 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\u003e16mm Focal Length in a 68° Flat-Field Design\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece's optical design is optimized to produce high-contrast, high-resolution images across its entire 68° apparent field. By using combinations of low-dispersion and high-refractive-index glasses with durable multi-layer coatings, stars remain sharp, point-like sources from the center to the edge of the field stop. The 16mm focal length hits a sweet spot, providing enough power to resolve individual stars in globular clusters while keeping the field wide enough to frame many nebulae and galaxies in their entirety.\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\u003eArgon-Purged Waterproofing in a 1.25\" Body\u003c\/h3\u003e\n\u003cp\u003eUnlike standard eyepieces, this 68° series model is environmentally sealed and purged with inert Argon gas. This process makes the eyepiece completely waterproof, preventing internal fogging during sudden temperature drops and protecting the optics from dust, moisture, and fungus for the life of the instrument. Argon provides superior long-term protection over Nitrogen because its larger atoms are less likely to escape through seals over time, ensuring the internal elements remain pristine.\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 68° Series Parfocal System: Seamless Magnification Changes\u003c\/h3\u003e\n\u003cp\u003eThe Explore Scientific 68° Series eyepieces are designed to be parfocal, meaning they all reach focus at nearly the same point. When you switch from this 16mm eyepiece to another focal length in the series, you'll only need a minimal, if any, turn of the focus knob. This saves valuable time at the telescope, keeping your target sharp and centered as you change magnification.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong Eye Relief:\u003c\/strong\u003e Generous eye relief allows for comfortable viewing, reducing eye strain during long observing sessions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFold-Down Eyecup:\u003c\/strong\u003e A soft, foldable silicone rubber eyecup shields your eye from stray light and can be adjusted for use with or without eyeglasses.\u003c\/li\u003e\n\u003c\/ul\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 16mm Sweet Spot: Framing Globular Clusters and Nebulae\u003c\/h3\u003e\n\u003cp\u003eIn the 68° series, the 16mm focal length serves as a crucial workhorse for deep-sky observing. While a longer focal length eyepiece like a 24mm or 34mm is ideal for locating objects, the 16mm provides the next step up in power needed to resolve structure. In a typical 8-inch f\/10 SCT, this eyepiece yields 127x magnification, perfect for darkening the sky background and making faint details pop in objects like the Hercules Cluster (M13) or the Ring Nebula (M57).\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\"\u003eWhat is the main advantage of the Explore Scientific 16mm 68° eyepiece being Argon-purged?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is \u003cstrong\u003etotal environmental protection\u003c\/strong\u003e. The Argon-purged and sealed body prevents internal fogging when moving from a warm house to a cold outdoor environment. It also permanently blocks dust, pollen, and moisture from getting between the lenses, eliminating the risk of internal fungus growth and ensuring the optics remain clean for life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 16mm focal length of this 68° eyepiece perform on planetary nebulae like the Ring Nebula (M57)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 16mm focal length is excellent for objects like the Ring Nebula (M57). In most telescopes, it provides enough magnification to clearly resolve M57's iconic smoke-ring shape while the 68° field of view provides a wide, dark backdrop that makes the nebula stand out. It offers a significant advantage over lower-power eyepieces that might show the nebula as just a small, fuzzy star.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 16mm 68° eyepiece suitable for observers who wear glasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. This eyepiece features \u003cstrong\u003elong eye relief\u003c\/strong\u003e, which means you can hold your eye at a comfortable distance from the lens and still see the entire 68° field of view. The soft silicone eyecup can also be folded down to provide a better fit for eyeglass wearers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does it mean that the Explore Scientific 16mm 68° eyepiece is 'parfocal'?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eParfocal\u003c\/strong\u003e means that this eyepiece will stay in focus when you switch it with other eyepieces from the same Explore Scientific 68° series. This is a significant convenience, as it minimizes the need to make large adjustments to your telescope's focuser each time you change magnification, saving you time and keeping your target centered.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 16mm eyepiece work well in my 8\" f\/10 Schmidt-Cassegrain telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. In an 8\" f\/10 SCT with a 2032mm focal length, this 16mm eyepiece provides 127x magnification. This is an ideal medium-high power for resolving globular clusters, viewing details in brighter nebulae, and studying lunar features. The 68° field will provide a true field of view of about half a degree, enough to frame the entire Orion Nebula (M42) sword region.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 68° field of view on this 16mm eyepiece compare to a standard 52° Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 68° apparent field of view feels significantly more immersive, like looking through a porthole rather than a narrow tube. While both eyepieces would provide the same magnification, the 68° eyepiece shows a much wider area of the surrounding sky, making it easier to appreciate the context of celestial objects and providing a more engaging \"spacewalk\" experience.\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\u003e16mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e68°\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\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eYes, Argon-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParfocal\u003c\/td\u003e\n\u003ctd\u003eYes, with 68° Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e8122570105472\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\"\u003eExplore Scientific 68° 16mm 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\u003cp\u003eNo manual or software is available for this product.\u003c\/p\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":44968076476701,"sku":"ES-EPWP6816-01","price":153.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-68-16mm__95451.1681244116.1280.1280.jpg?v=1684348756"},{"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"},{"product_id":"explore-scientific-epwp9225ed-01","title":"Explore Scientific 92° ED Series 25mm Waterproof Eyepiece","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e92° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e25mm Focal Length\u003c\/li\u003e\n\u003cli\u003e2\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eExtra-Low Dispersion (ED) Glass\u003c\/li\u003e\n\u003cli\u003eWaterproof and Fog-Proof 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\u003e92° ED Series 25mm Waterproof Eyepiece\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 92° ED Series 25mm Waterproof Eyepiece delivers an ultra-wide, low-magnification viewing experience in a 2-inch barrel format. Its 25mm focal length is designed for sweeping through vast star fields, while the immense 92° apparent field of view creates a genuine \"spacewalk\" immersion that narrower designs cannot replicate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 92° Panoramic Window on the Cosmos\u003c\/h3\u003e\n\u003cp\u003eThe 92° apparent field of view fundamentally changes how you observe. Instead of looking through a narrow portal, the view fills your perception, allowing large deep-sky objects to be seen in their entirety. You can frame the full expanse of the Andromeda Galaxy (M31) or trace the intricate dust lanes of the North American Nebula (NGC 7000) without panning your telescope.\u003c\/p\u003e\n\u003cp\u003eThis eyepiece is engineered to serve as a wide-field finder and a primary observing instrument. The low power provided by the 25mm focal length makes it easy to locate targets and appreciate the grand scale of the Milky Way's star clouds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eED Glass for High-Contrast, Color-Free Views\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece uses Extra-Low Dispersion (ED) glass to significantly reduce chromatic aberration—the false color fringing seen around bright stars and planetary limbs. By correcting for this distortion, star points remain sharp and white across the field, and subtle color differences in nebulae become more apparent.\u003c\/p\u003e\n\u003cp\u003eThe primary benefit is a dramatic increase in contrast. With chromatic aberration suppressed, the sky background appears darker and the separation between faint objects and the surrounding space is much more distinct, improving the visibility of faint galactic arms and nebulous filaments.\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 Construction for All-Night Observing\u003c\/h3\u003e\n\u003cp\u003eBuilt to withstand challenging field conditions, this eyepiece is fully waterproof. The internal optical chambers are sealed and purged, preventing internal fogging when moving from a warm house to a cool observing site. This also protects the internal lens surfaces from dust and moisture, ensuring long-term optical integrity.\u003c\/p\u003e\n\u003cp\u003eThe design incorporates long eye relief, providing comfortable viewing for extended periods. This is a critical feature for observers who wear eyeglasses, allowing them to see the entire 92° field without having to press their eye against the lens.\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\u003e92° vs. 70° Field: The Immersive Difference\u003c\/h3\u003e\n\u003cp\u003eWhile a 70° eyepiece offers a wide view, a 92° field delivers a qualitatively different experience. The key distinction is the role of the field stop—the black edge of the viewing circle.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e70° Field:\u003c\/strong\u003e You are aware of the field stop. The view feels like a generous window, but it is still clearly a window.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e92° Field:\u003c\/strong\u003e The field stop recedes into your peripheral vision, often disappearing entirely. This creates the sensation of being suspended in space rather than looking through an instrument, which is the ultimate goal of an ultra-wide eyepiece. The trade-off for this immersion is the requirement for a 2\" focuser, which is not standard on all telescopes.\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 92° 25mm eyepiece ideal for large deep sky objects?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe combination of a long \u003cstrong\u003e25mm focal length\u003c\/strong\u003e (for low magnification) and an enormous \u003cstrong\u003e92° apparent field of view\u003c\/strong\u003e allows you to fit exceptionally large objects like the Andromeda Galaxy (M31) or the Veil Nebula complex into a single frame. This contextual view is impossible to achieve with standard eyepieces at the same magnification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the 92° 25mm eyepiece perform in an 8\" 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 a typical 8\" f\/10 SCT with a 2032mm focal length, this 25mm eyepiece will yield approximately 81x magnification. The true field of view will be over 1.1°, wide enough to frame not just the core Trapezium stars but also the entire \"wingspan\" of the Orion Nebula (M42) and its neighbor, De Mairan's Nebula (M43), with dark sky around them. The ED glass will ensure the hot, bright stars of the Trapezium are rendered as sharp points without distracting purple halos.\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 Explore Scientific 92° 25mm 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 corrects for chromatic aberration. In practical terms, this means you get higher contrast and sharper views. Bright stars will not show false color fringes (like purple halos), and the background sky will appear darker, making it easier to see faint details in galaxies and nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 92° 25mm eyepiece a good choice for planetary viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this eyepiece is not designed for high-magnification planetary viewing. Its long 25mm focal length provides low power, which is ideal for deep-sky objects. For observing fine details on Jupiter or the rings of Saturn, a short focal length eyepiece (e.g., 5mm to 9mm) would be a much better choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the long eye relief of this eyepiece suitable for observers who wear glasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The long eye relief is a key feature designed for comfort, especially for eyeglass wearers. It allows you to position your eye at a sufficient distance to see the entire vast 92° field of view without removing your glasses, which is critical if you need them to correct for astigmatism.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the \"waterproof\" feature mean for the 92° 25mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBeing waterproof means the eyepiece is internally sealed and purged with an inert gas. This has two major benefits for an observer:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrevents Internal Fogging:\u003c\/strong\u003e It won't fog up on the inside during nights with heavy dew.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKeeps Dust Out:\u003c\/strong\u003e The seals prevent dust, pollen, and other contaminants from getting inside the eyepiece and settling on the lens surfaces, ensuring a clean view for years.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\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":52909354582301,"sku":"ES-EPWP9225ED-01","price":700.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-92-ED-Series-25mm-Waterproof-Eyepiece-1_a286425f-d806-4d32-98c2-c9651fb00c61.jpg?v=1789061413"},{"product_id":"explore-scientific-epwp9209ed-01","title":"Explore Scientific 92° ED Series 9mm Waterproof Eyepiece","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e9mm Focal Length\u003c\/li\u003e\n\u003cli\u003e92° 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 92° ED Series 9mm Waterproof Eyepiece\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 92° ED Series 9mm Waterproof Eyepiece delivers an ultra-wide 92° apparent field of view in a 9mm focal length, optimized for high-magnification planetary and deep-sky observation. This 2-inch barrel eyepiece is engineered to create a fully immersive, \"spacewalk\" experience, keeping targets in the view longer at high power and reducing the need for constant scope adjustments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 92° Spacewalk: High-Power Views in a 9mm Eyepiece\u003c\/h3\u003e\n\u003cp\u003eThe 92° apparent field of view transforms high-power observing from looking through a keyhole into a panoramic experience. At the high magnification provided by the 9mm focal length, this expansive view allows you to frame not just Jupiter, but its Galilean moons in a single, dramatic vista. For smaller deep-sky objects like the Ring Nebula (M57) or the Hercules Cluster (M13), the wide field provides context, making the object feel suspended in a vast, dark 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\u003eED Glass in a 2-Inch Barrel: Maximizing Contrast and Color Fidelity\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece uses Extra-Low Dispersion (ED) glass to virtually eliminate chromatic aberration, or false color fringing. This correction is critical at high magnifications, ensuring fine details on bright objects like the lunar terminator or Saturn's rings resolve with maximum sharpness and contrast. The result is a color-pure image, preserving the subtle hues of Jupiter's cloud bands and the true colors of double stars.\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-Power Comfort: The 9mm ED's All-Weather Design\u003c\/h3\u003e\n\u003cp\u003eEngineered for demanding field use, this 9mm eyepiece is fully waterproof and gas-purged. This process prevents internal optics from fogging during nights with heavy dew, protecting your investment and ensuring your views remain clear. The design also incorporates long eye relief, providing comfortable viewing during extended sessions and reducing eye strain when studying faint planetary details.\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 92° 9mm vs. TV 9mm Nagler: A 92° Field vs. an 82° Benchmark\u003c\/h3\u003e\n\u003cp\u003eThe Tele Vue 9mm Nagler is a long-standing benchmark for high-power, wide-field viewing, known for its sharp optics and compact form factor. The Explore Scientific 92° 9mm eyepiece, however, presents a compelling alternative with distinct advantages.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWider Apparent Field:\u003c\/strong\u003e The primary difference is the Explore Scientific's 92° field compared to the Nagler's 82°. This extra 10 degrees creates a noticeably more immersive view.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll-Weather Construction:\u003c\/strong\u003e The waterproof and gas-purged design of the Explore Scientific eyepiece is a significant practical advantage for observers in humid climates, a feature not standard on the Nagler.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrade-Offs:\u003c\/strong\u003e To achieve its ultra-wide field, the 92° eyepiece is physically larger than a Nagler. Both eyepieces represent a significant step up from standard Plössl or Kellner designs in both view quality and physical size.\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 92° 9mm 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 a typical 8\" f\/10 SCT (2032mm focal length), the 9mm eyepiece yields 226x magnification. This is an ideal power for resolving fine details like the Cassini Division in Saturn's rings and intricate cloud bands on Jupiter. The 92° field of view will comfortably frame the planet and all four Galilean moons simultaneously.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 9mm focal length of this Explore Scientific eyepiece suitable for viewing the Ring Nebula (M57) in a 10\" Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent choice. A 10\" f\/4.7 Dobsonian (1200mm focal length) would achieve 133x with this 9mm eyepiece. This magnification is high enough to show the central star within M57 on a good night, while the 92° field provides a dark, expansive backdrop that makes the nebula stand out.\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 92° field of view on the Explore Scientific 9mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary benefit is the immersive, \"spacewalk\" feeling it creates, which makes observing more engaging. Practically, it keeps objects within the field of view for a longer time, especially on non-driven mounts like Dobsonians, reducing the need to constantly nudge the telescope at high power.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the \"ED\" in the Explore Scientific 92° 9mm eyepiece mean for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eED\u003c\/strong\u003e stands for \u003cstrong\u003eExtra-Low Dispersion\u003c\/strong\u003e glass. For the observer, this means the eyepiece corrects for chromatic aberration (false color). Views of high-contrast targets like the Moon, planets, and bright stars will be sharper, with higher contrast and no distracting purple or yellow color fringing around the edges.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 92° 9mm eyepiece comfortable 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 long eye relief, which allows you to hold your eye at a comfortable distance from the lens and still see the entire 92° field of view. This makes it significantly more comfortable for eyeglass wearers than eyepieces with short eye relief.\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 92° 9mm useful?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWaterproofing is achieved by sealing the eyepiece and purging the air inside with an inert gas like argon or nitrogen. This prevents moisture, dew, and dust from getting inside the eyepiece barrel. It ensures the internal lens surfaces stay clean and prevents internal fogging on cold or humid nights.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\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":52909355761949,"sku":"ES-EPWP9209ED-01","price":630.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-92-ED-Series-9mm-Waterproof-Eyepiece-1_c518bb4d-de4b-42b7-809a-2bc8526ffb07.jpg?v=1789061423"},{"product_id":"explore-scientific-epwp9214ed-01","title":"Explore Scientific 92° ED Series 14mm Waterproof Eyepiece","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e14mm Focal Length\u003c\/li\u003e\n\u003cli\u003e92° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2-inch Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eExtra-Low Dispersion (ED) Glass Element\u003c\/li\u003e\n\u003cli\u003eWaterproof, 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 92° ED Series 14mm Waterproof Eyepiece\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 92° ED Series 14mm Waterproof Eyepiece delivers an exceptionally immersive, ultra-wide viewing experience in a 2-inch barrel format. Its 92° apparent field of view provides a \"spacewalk\" perspective, allowing you to see large swaths of the sky and frame extensive deep-sky objects without panning your telescope.\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 92° Apparent Field: A Spacewalk-Like View\u003c\/h3\u003e\n\u003cp\u003eWith a 92° apparent field, this eyepiece renders an image that can fill your entire field of vision, creating the sensation of looking through a spaceship porthole rather than an eyepiece. This ultra-wide perspective is ideal for observing large nebulae like the North American Nebula (NGC 7000) or scanning the dense star fields of the Milky Way, as it keeps the object comfortably framed with a dark sky border.\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\u003e14mm Focal Length with ED Glass: High-Contrast Views\u003c\/h3\u003e\n\u003cp\u003eThe 14mm focal length provides moderate magnification, making it a versatile workhorse for a wide range of celestial targets. An integrated Extra-Low Dispersion (ED) glass element significantly reduces chromatic aberration, or color fringing, which is especially noticeable on bright objects like Jupiter and the lunar limb. This results in sharper, higher-contrast images with more accurate color rendition across 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\u003eWaterproof, Purged Body in a 2-Inch Format\u003c\/h3\u003e\n\u003cp\u003eDesigned for durability in the field, the eyepiece is fully waterproofed and purged with an inert gas. This prevents internal fogging during nights with high humidity or rapid temperature drops and protects the internal lens surfaces from dust and fungus. The robust 2-inch barrel provides a secure connection to the focuser and is necessary to accommodate the large lens elements required for the ultra-wide 92° 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\u003eExplore Scientific 14mm 92° vs. Tele Vue 13mm Nagler: Field of View and Features\u003c\/h3\u003e\n\u003cp\u003eWhen choosing an ultra-wide eyepiece, a common comparison is with the Tele Vue Nagler series. The 13mm Nagler is a benchmark for edge-of-field sharpness and correction in a compact format.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eApparent Field of View:\u003c\/strong\u003e The Tele Vue 13mm Nagler offers an 82° apparent field. The Explore Scientific eyepiece provides a noticeably larger 92° field, increasing the sense of immersion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeatherproofing:\u003c\/strong\u003e The Explore Scientific 92° series is gas-purged and waterproof, a significant advantage for observers in humid climates or those concerned with long-term durability. The Nagler series is not sealed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEye Relief:\u003c\/strong\u003e Both eyepieces have similar eye relief, though the longer eye relief of the Explore Scientific design may be more comfortable for some observers during extended sessions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel Size:\u003c\/strong\u003e The Explore Scientific 14mm uses a 2-inch barrel exclusively, while the 13mm Nagler is a dual-format 1.25\"\/2\" design, offering more flexibility for different focusers.\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 kind of objects is the Explore Scientific 14mm 92° eyepiece best for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis eyepiece excels at observing large deep-sky objects where a wide, immersive field is beneficial. It's ideal for open star clusters like the Pleiades (M45), large emission nebulae like the Orion Nebula (M42), and for scanning the star clouds of Sagittarius in the Milky Way.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the 14mm 92° 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\u003eIn a typical 8\" f\/10 Schmidt-Cassegrain with a 2032mm focal length, the 14mm eyepiece will provide 145x magnification. This is an excellent medium-high power for resolving detail in globular clusters like the Hercules Cluster (M13) and viewing planetary nebulae, all while enjoying the expansive 92° field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 14mm 92° eyepiece good for fast telescopes like an f\/4.5 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUltra-wide eyepieces can be demanding on fast optical systems. While the Explore Scientific 92° series is well-corrected, you may notice some astigmatism or coma at the very edges of the field in telescopes faster than f\/5. Using a coma corrector with a fast Newtonian is highly recommended to get the best performance across the full 92° field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"waterproof and purged\" mean for the 14mm 92° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe eyepiece barrel is sealed with O-rings and filled with an inert gas (like argon or nitrogen). This has two main 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 surfaces over the life of the eyepiece.\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 does this eyepiece only come in a 2-inch barrel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTo achieve a 92° apparent field of view at a 14mm focal length, the lenses must be very large. A standard 1.25-inch barrel is physically too small to accommodate the required lens diameter without severe vignetting (cutting off the light path), so a 2-inch barrel is necessary.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the long eye relief on the Explore Scientific 14mm 92° help with eyeglasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the long eye relief is designed to provide a more comfortable viewing experience, especially for observers who wear glasses to correct for astigmatism. You should be able to see a significant portion of the wide field of view with your glasses on, though seeing the absolute edge may still require careful eye placement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\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":52909357826333,"sku":"ES-EPWP9214ED-01","price":630.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-92-ED-Series-14mm-Waterproof-Eyepiece-1_8aca00c4-046a-459a-a59a-7371285e1a80.jpg?v=1789061431"}],"url":"https:\/\/davidastro.com\/collections\/explore-scientific-eyepieces.oembed?page=3","provider":"David Astro","version":"1.0","type":"link"}