{"title":"Explore Scientific 100° and 120° Eyepieces","description":"\u003cp\u003eExplore Scientific 100° and 120° eyepieces have some of the widest apparent fields made, so the field stop sits at the edge of your vision. The 100° series includes 5.5mm, 9mm, 14mm, 20mm and 25mm models in 2\" barrels and a 30mm in a 3\" barrel, while the 120° 9mm goes wider still.\u003c\/p\u003e\u003cp\u003eAll are waterproof and argon-purged against internal fogging. They suit deep-sky observers with Dobsonians and fast telescopes who want large star fields at useful magnification.\u003c\/p\u003e","products":[{"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"}],"url":"https:\/\/davidastro.com\/en-us\/collections\/explore-scientific-100-and-120-eyepieces.oembed","provider":"David Astro","version":"1.0","type":"link"}