{"title":"Explore Scientific","description":"\u003cdiv\u003e\n  \u003cp\u003e\n    Explore Scientific occupies a useful place in the market: optics and eyepieces built to a standard that used to cost considerably more, backed by a transferable warranty. Their waterproof, argon-purged wide-field eyepieces and FCD-100 air-spaced apochromatic refractors are the products most often recommended to observers who have outgrown entry-level gear. David Astro carries Explore Scientific products in Canada, held in stock for fast domestic shipping.\n  \u003c\/p\u003e\n  \u003cp\u003e\n    Our team uses these instruments in the field, including in the cold and damp conditions where the argon purging in the eyepiece line genuinely earns its keep. We can tell you where the line's strengths are and where a different brand suits your use better.\n  \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- more --\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eThe Explore Scientific Lineup\u003c\/h2\u003e\n  \u003cp\u003e\n    Explore Scientific covers visual and imaging from beginner through advanced, with the eyepiece series being the best-known part of the catalogue.\n  \u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003e62, 68, 82 and 92 degree eyepieces:\u003c\/strong\u003e Waterproof and argon-purged so internal surfaces cannot fog, which matters on humid Canadian summer nights and in rapid temperature drops.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e100 degree series:\u003c\/strong\u003e Very wide apparent field designs for immersive views, particularly effective in undriven Dobsonians where field width equals tracking time.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eED apochromatic refractors:\u003c\/strong\u003e FCD-100 and FCD-1 glass air-spaced triplets with carbon fibre and aluminium tube options, suited to both wide-field imaging and high-contrast visual use.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTruss-tube and solid-tube Dobsonians:\u003c\/strong\u003e Large-aperture visual instruments with collapsible designs that make transport realistic.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMaksutov-Newtonian and Cassegrain optics:\u003c\/strong\u003e Long focal length designs for planetary and lunar detail.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDiagonals, Barlows and accessories:\u003c\/strong\u003e Dielectric diagonals, focal extenders and finders designed around the rest of the line.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eWhy Choose David Astro for Explore Scientific\u003c\/h2\u003e\n  \u003cp\u003e\n    Explore Scientific's range is broad enough that the wrong choice within it is easy. We narrow it against your telescope and your sky.\n  \u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEyepiece series matched to focal ratio:\u003c\/strong\u003e The wider series perform best in fast telescopes where cheaper designs break down at the edge; in slow scopes the narrower series is often the better value.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWeight and balance checked:\u003c\/strong\u003e The 100 degree eyepieces are heavy enough to unbalance a small Dobsonian, and we will tell you before you order rather than after.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAuthorized dealer:\u003c\/strong\u003e Full manufacturer warranty, with the transferable coverage properly registered and warranty handled domestically.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCanadian stock:\u003c\/strong\u003e In-stock items ship from Canada with no duties or brokerage fees for Canadian buyers.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSetup and collimation support:\u003c\/strong\u003e In-house help with first light on the larger Dobsonians and Newtonians.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eExplore Scientific in Canada — Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdl\u003e\n    \u003cdt\u003e\u003cstrong\u003eWhat does argon purging actually do?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eIt replaces the air inside the eyepiece with dry argon and seals it, so interior lens surfaces cannot fog when the eyepiece is moved between warm and cold air. In Canadian conditions that happens constantly.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003eIs the 82 or the 92 degree series better?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eThe 92 series has a wider field and better edge correction in fast telescopes, at more weight and cost. In an f\/8 or slower scope the 82 series performs very close to it for considerably less.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003eAre the ED refractors good for imaging?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eYes, paired with a matched field flattener. The triplet designs control colour well enough for broadband imaging, and the focusers on the current models handle typical imaging trains.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003eIs the warranty valid if I buy in Canada?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eYes, and it is handled here. As an authorized dealer we register and service warranty claims domestically, without international shipping.\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eChoosing within the range?\u003c\/h2\u003e\n  \u003cp\u003eTell us your telescope and what you observe, and we will narrow it down. Canadian stock, warranty handled here.\u003c\/p\u003e\n\u003c\/div\u003e","products":[{"product_id":"explore-scientific-firstlight-twilight-nano-mount","title":"Explore Scientific FirstLight Twilight Nano Mount","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eLight-Duty Alt-Azimuth Mount Head\u003c\/li\u003e\n\u003cli\u003eVixen-Style Dovetail Saddle\u003c\/li\u003e\n\u003cli\u003eAdjustable-Height Metal Tripod\u003c\/li\u003e\n\u003cli\u003eSingle-Arm Control Handle for Smooth Motion\u003c\/li\u003e\n\u003cli\u003eDesigned for \"Grab-and-Go\" Telescope Setups\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 FirstLight Twilight Nano Mount\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific FirstLight Twilight Nano Mount is a dedicated \u003ca href=\"\/collections\/alt-azimuth-mounts\"\u003ealt-azimuth\u003c\/a\u003e platform engineered for the ultimate \"grab-and-go\" observing session. This light-duty mount and \u003ca href=\"\/collections\/tripods-and-piers\"\u003etripod\u003c\/a\u003e combination provides a stable, intuitive base for small telescopes, allowing for quick setup and easy transport. It accepts any telescope with a Vixen-style \u003ca href=\"\/collections\/dovetail-plates\"\u003edovetail bar\u003c\/a\u003e, making it a versatile foundation for small \u003ca href=\"\/collections\/refractors\"\u003erefractors\u003c\/a\u003e, \u003ca href=\"\/collections\/maksutov-cassegrain-telescopes\"\u003eMaksutov-Cassegrains\u003c\/a\u003e, and fast \u003ca href=\"\/collections\/newtonian-telescopes\"\u003eNewtonian reflectors\u003c\/a\u003e.\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 Twilight Nano's Alt-Azimuth Head: Smooth, Intuitive Control\u003c\/h3\u003e\n\u003cp\u003eDesigned for simplicity and fluid motion, the Twilight Nano's alt-azimuth head allows you to point your telescope anywhere in the sky by moving it up, down, left, and right. A single, large handle gives you precise control over the vertical (altitude) axis for smooth tracking of celestial objects and also serves as a lock to fix the telescope's position.\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\u003eVixen-Style Saddle: Broad Telescope Compatibility\u003c\/h3\u003e\n\u003cp\u003eThe Twilight Nano features a Vixen-style \u003ca href=\"\/collections\/saddles-and-clamps\"\u003edovetail saddle\u003c\/a\u003e, the industry standard for lightweight telescopes. This ensures out-of-the-box compatibility with a wide range of optical tubes, including popular models like the Explore Scientific ED80 refractor, small solar scopes, and compact Maksutov-Cassegrains. If your telescope has a Vixen-style rail, it will mount directly to the Twilight Nano without any additional hardware.\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\u003eAdjustable Metal Tripod: Set a Comfortable Viewing Height\u003c\/h3\u003e\n\u003cp\u003eThe mount is supported by a sturdy, yet lightweight, metal tripod. Its legs are continuously adjustable, allowing you to set the \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e at a comfortable height whether you're standing or seated, and making it accessible for observers of all ages. This adaptability is key for finding a stable, level position on uneven ground for backyard sessions or remote dark-sky sites.\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\u003eTwilight Nano vs. Photo Tripods: Why an Astronomy Mount Matters\u003c\/h3\u003e\n\u003cp\u003eWhile a heavy-duty photo tripod might seem sufficient, the Twilight Nano is purpose-built for astronomy, offering critical advantages. Its single-arm design is engineered to handle the cantilevered load of a telescope pointed towards the zenith, a position where photo heads can slip or fail. The movements are designed for tracking celestial objects, providing smoother motion with less friction than the pan\/tilt heads on camera tripods.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoad Bearing:\u003c\/strong\u003e Designed specifically to hold a telescope securely at high angles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmooth Tracking:\u003c\/strong\u003e The alt-azimuth motions are engineered for astronomical use, avoiding the \"stiction\" common in photo heads when making fine adjustments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Connection:\u003c\/strong\u003e The Vixen-style saddle is a dedicated astronomical standard, providing a more secure connection than a single 1\/4\"-20 screw.\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 telescopes work best with the Explore Scientific FirstLight Twilight Nano Mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Twilight Nano is designed for small, lightweight telescopes. It is an excellent match for \u003cstrong\u003eshort-tube refractors (like the ED80)\u003c\/strong\u003e, \u003cstrong\u003esmall Maksutov-Cassegrains\u003c\/strong\u003e, \u003cstrong\u003esmall solar telescopes\u003c\/strong\u003e, and \u003cstrong\u003eshort, fast Newtonian reflectors\u003c\/strong\u003e. Any telescope assembly with a Vixen-style dovetail bar will be compatible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Twilight Nano Mount for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Twilight Nano is an alt-azimuth mount, which means it is not designed for long-exposure astrophotography of deep-sky objects, as this requires an equatorial mount to track the stars' motion correctly and avoid field rotation. However, it is perfectly suitable for taking short snapshots of the Moon and bright planets with a \u003ca href=\"\/collections\/smartphone-adapters\"\u003esmartphone adapter\u003c\/a\u003e or a dedicated \u003ca href=\"\/collections\/planetary-cameras\"\u003eplanetary camera\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Twilight Nano Mount compare to using a standard photo tripod for astronomy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Twilight Nano offers superior stability and smoother motion for astronomical viewing. Unlike a photo tripod, it's designed to hold a telescope's weight safely when pointed high in the sky. It also uses a Vixen-style saddle for a much more secure, dedicated telescope connection than a simple camera screw.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Twilight Nano Mount suitable for a beginner astronomer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. Its simple point-and-look design is extremely intuitive for beginners. There is no complex alignment procedure required, making it a perfect \"grab-and-go\" solution that encourages frequent use and learning the night sky by star-hopping.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill my Explore Scientific ED80 refractor fit on the Twilight Nano Mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Explore Scientific ED80 is an ideal match for the Twilight Nano mount. The ED80 comes with a Vixen-style dovetail plate that will slide directly into the mount's saddle for a secure fit, creating a premium, portable observing setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Twilight Nano stable enough for viewing Jupiter's moons with a small Maksutov-Cassegrain?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. When paired with a compatible lightweight Maksutov-Cassegrain, the Twilight Nano provides a solid platform for planetary viewing. The smooth controls allow for easy tracking of Jupiter as it moves across the sky, and the stability is sufficient to resolve its four Galilean moons at typical 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\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257018307\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":44967196033309,"sku":"ES-FL-TWINANOT1-00","price":140.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-FirstLight-Twilight-Nano-Mount-FL-TWINANOT1-00-1__59381.1594240332.1280.1280.jpg?v=1684338654"},{"product_id":"explore-scientific-firstlight-exos-nano-mount","title":"Explore Scientific FirstLight EXOS Nano Mount","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e15 lb Payload Capacity\u003c\/li\u003e\n\u003cli\u003e10 lb Mount Weight (without Counterweight)\u003c\/li\u003e\n\u003cli\u003eLight-Duty German Equatorial Design\u003c\/li\u003e\n\u003cli\u003eVixen-Style Dovetail Saddle\u003c\/li\u003e\n\u003cli\u003e1.25\" Adjustable Steel Tripod\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 FirstLight EXOS Nano Mount\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific FirstLight EXOS Nano Mount is a light-duty \u003ca href=\"\/collections\/equatorial-mounts\"\u003eGerman Equatorial mount\u003c\/a\u003e and \u003ca href=\"\/collections\/tripods-and-piers\"\u003etripod\u003c\/a\u003e for telescopes up to 15 pounds with a Vixen-Style Universal \u003ca href=\"\/collections\/dovetail-plates\"\u003eDovetail bar\u003c\/a\u003e. The mount (without \u003ca href=\"\/collections\/counterweights\"\u003ecounterweight\u003c\/a\u003e) weighs 10 pounds. It comes with the 1.25\" sturdy steel ST1 tripod, which stands 38.5\" to 45\" at its highest point with the mount head fitted.\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 Light-Duty German Equatorial Mount for Scopes up to 15 lbs\u003c\/h3\u003e\n\u003cp\u003eExplore Scientific designed the EXOS Nano to quickly and easily accept small scopes. Its rule is simple: as long as your telescope does not exceed 15 pounds and has a Vixen-Style Universal Dovetail bar, you are good to go. Once polar aligned, an equatorial mount follows the sky's motion around one axis, the right ascension axis.\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 1.25\" ST1 Steel Tripod Foundation\u003c\/h3\u003e\n\u003cp\u003eThe ST1 is a 1.25\" sturdy steel tripod. With the mount head attached and the tripod open, it stands 38.5\" at its highest point with legs retracted (36\" to the center of the mounting bracket) and 45\" with legs fully extended. Fully collapsed it is 25.5\" without the head and 42\" with it.\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\u003eTelescopes That Suit the EXOS Nano\u003c\/h3\u003e\n\u003cp\u003eThe mount accepts telescopes with a Vixen-Style Universal Dovetail bar.\u003c\/p\u003e\n\u003cp\u003eGood matches include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe ED80mm and other small refractors.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall Mak-Cassegrains.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall solar scopes.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShort, fast Newtonians.\u003c\/strong\u003e\n\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\u003eWeight\u003c\/h3\u003e\n\u003cp\u003eThe mount (without counterweight) weighs 10 pounds, making the EXOS Nano lightweight.\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 maximum payload of the Explore Scientific FirstLight EXOS Nano Mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Explore Scientific FirstLight EXOS Nano Mount has a specified payload capacity of \u003cstrong\u003e15 pounds\u003c\/strong\u003e. Your telescope must not exceed 15 pounds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of telescopes are compatible with the EXOS Nano mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTelescopes up to 15 pounds with a \u003cstrong\u003eVixen-Style Universal Dovetail bar\u003c\/strong\u003e. Suitable choices include small Mak-Cassegrains, small \u003ca href=\"\/collections\/refractors\"\u003erefractors\u003c\/a\u003e, small solar scopes, the ED80mm and short, fast \u003ca href=\"\/collections\/newtonian-telescopes\"\u003eNewtonians\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the EXOS Nano mount suitable for long-exposure astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the EXOS Nano is designed primarily for \u003cstrong\u003evisual astronomy\u003c\/strong\u003e. It is a light-duty mount for small scopes, and no motor drives, autoguiding or \u003ca href=\"\/collections\/polar-scopes\"\u003epolar scope\u003c\/a\u003e are listed for it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would the EXOS Nano mount handle an 80mm refractor for viewing Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ED80mm is a good match: ED80 tubes weigh 3.4 kg (7.5 lb), well under 15 pounds. Once polar aligned, following Jupiter means moving mainly the right ascension axis.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the EXOS Nano mount with a small Maksutov-Cassegrain?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Small Mak-Cassegrains are a match, as long as the telescope does not exceed 15 pounds and has a Vixen-Style Universal Dovetail bar.\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 1.25\" steel tripod on the EXOS Nano?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ST1 is a 1.25\" sturdy steel tripod. Its legs extend so the open tripod with head stands 38.5\" to 45\" at its highest point.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow much does the complete EXOS Nano mount system weigh?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe mount (without counterweight) weighs \u003cstrong\u003e10 pounds\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs it difficult to set up and polar align the EXOS Nano mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor visual use, a rough polar alignment is enough: tilt the polar axis to your latitude and point it roughly north (or south in the Southern Hemisphere).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the EXOS Nano mount include a polar scope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo polar scope is listed for the EXOS Nano, and our box list shows the mount only.\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\u003eMount Type\u003c\/td\u003e\n\u003ctd\u003eGerman Equatorial\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePayload Capacity\u003c\/td\u003e\n\u003ctd\u003e15 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount Weight\u003c\/td\u003e\n\u003ctd\u003e10 lbs (without counterweight)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Mounting\u003c\/td\u003e\n\u003ctd\u003eVixen-Style Universal Dovetail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTripod\u003c\/td\u003e\n\u003ctd\u003eST1 Steel Tripod\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTripod Leg Diameter\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTripod Height Range\u003c\/td\u003e\n\u003ctd\u003e38.5\" to 45\" (with mount head)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257018291\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSaddle\u003c\/td\u003e\n\u003ctd\u003eVixen\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGoTo\u003c\/td\u003e\n\u003ctd\u003eNo (manual slow-motion controls)\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 FirstLight EXOS Nano Mount\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\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":44967196066077,"sku":"ES-FL-EXOSNANOT1-00","price":209.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-FirstLight-EXOS-Nano-Mount-FL-EXOSNANOT1-00-1__09113.1594240333.1280.1280.jpg?v=1684338656"},{"product_id":"explore-scientific-exos2-gt-equatorial-mount-with-pmc-eight-goto-system","title":"Explore Scientific EXOS2-GT Equatorial Mount with PMC-Eight GoTo System","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e28 lb Astrophotography Payload Capacity\u003c\/li\u003e\n\u003cli\u003e40 lb Visual Payload Capacity\u003c\/li\u003e\n\u003cli\u003ePMC-Eight OpenGOTO System\u003c\/li\u003e\n\u003cli\u003eWireless Control via WiFi \u0026amp; Bluetooth®\u003c\/li\u003e\n\u003cli\u003eIncludes Two 11.25 lb Counterweights\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\u003eEXOS2-GT Equatorial Mount with PMC-Eight GoTo System\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific EXOS2-GT mount supports a 28 lb astrophotography payload and a 40 lb visual payload on a robust 30 lb platform. Its PMC-Eight GoTo system connects wirelessly via WiFi or Bluetooth® to the ExploreStars app, which contains a database of over 80,000 objects. The heavy-duty tripod features 2-inch stainless steel legs adjustable from 26.8\" to 42.5\", providing a stable foundation for serious imaging and 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-Payload Design: 28 lbs for Imaging, 40 lbs for Visual\u003c\/h3\u003e\n\u003cp\u003eThe EXOS2-GT is engineered with two distinct payload capacities: a 28 lb limit for demanding astrophotography and a 40 lb limit for visual observation. This dual rating acknowledges that while the mount can physically carry heavier loads, the tight tracking precision required for long-exposure imaging is maintained with a sub-28 lb instrument. For visual use, where minor tracking deviations are imperceptible, you can confidently mount larger telescopes.\u003c\/p\u003e\n\u003cp\u003eThis capacity is supported by a heavy-duty stainless steel tripod with 2-inch diameter legs, a built-in bubble level, and an extension range from 26.8 to 42.5 inches. The entire system, weighing 30 lbs without counterweights, offers a portable yet remarkably solid platform that rivals much larger mounts. The choice of belt-driven stepper motors over DC servos ensures the drive system can handle significant strain without damaging mechanical or electronic components.\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\u003ePMC-Eight GoTo: Wireless Control with Stepper Motor Precision\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the EXOS2-GT is the PMC-Eight, an open-source GoTo system controlled wirelessly from your own device. Using WiFi or Bluetooth®, you can command the mount from any tablet or PC running Windows, Android, or iOS without being tethered by a hand controller. This allows you to stay warm indoors while your telescope operates outside, or simply enjoy a more comfortable, cable-free setup in the field.\u003c\/p\u003e\n\u003cp\u003eThe open architecture of the PMC-Eight extends to its software compatibility. In addition to the native ExploreStars app, a full ASCOM driver is provided, allowing you to integrate the mount with a vast ecosystem of third-party software. This includes popular astrophotography suites like Sequence Generator Pro, N.I.N.A., and Maxim DL, as well as planetarium programs like Stellarium and Cartes du Ciel.\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\u003eExploreStars App: Navigating an 80,000+ Object Database\u003c\/h3\u003e\n\u003cp\u003eThe free ExploreStars application transforms your tablet or computer into a powerful observatory control center. It features an intuitive graphical interface for navigating the night sky and controlling the mount. Alignment is streamlined with simple 2-star and 3-star procedures, getting you on target quickly and accurately.\u003c\/p\u003e\n\u003cp\u003eThe app's celestial database includes over 80,000 objects, from planets in our solar system to deep-sky targets in the Messier, NGC, and IC catalogs. For many popular objects, ExploreStars provides educational information and images, enriching your observing session. This database is updatable and can even be customized, allowing you to add your own notes and images to your favorite targets.\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 real-world payload of the EXOS2-GT mount for imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe official astrophotography payload for the EXOS2-GT is \u003cstrong\u003e28 lbs\u003c\/strong\u003e. This refers to the weight of the telescope and all imaging accessories (camera, guide scope, filter wheel, etc.). While the mount can physically handle more for visual use (up to 40 lbs), staying at or below the 28 lb imaging limit ensures the tracking accuracy required for sharp, long-exposure images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat devices can I use to control the EXOS2-GT with the PMC-Eight system?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou can control the EXOS2-GT mount wirelessly using a wide range of devices. The PMC-Eight system and its ExploreStars app are compatible with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWindows 8.1 or 10 PCs, laptops, and tablets\u003c\/li\u003e\n\u003cli\u003eAndroid tablets and phones\u003c\/li\u003e\n\u003cli\u003eApple iPads and iPhones (iOS)\u003c\/li\u003e\n\u003cli\u003eAmazon Fire tablets\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eYou connect to the mount via its built-in \u003cstrong\u003eWiFi or Bluetooth®\u003c\/strong\u003e, eliminating the need for a traditional hand controller.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the EXOS2-GT PMC-Eight support ASCOM for use with software like Sequence Generator Pro?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e The EXOS2-GT with PMC-Eight is fully ASCOM compliant. Explore Scientific provides a dedicated ASCOM driver that allows the mount to be controlled by any ASCOM-compatible software, including popular automation and planetarium programs like Sequence Generator Pro (SGP), N.I.N.A., APT, Stellarium, and Cartes du Ciel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the EXOS2-GT's stepper motor drive compare to a servo motor drive?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe EXOS2-GT uses \u003cstrong\u003ebelt-driven stepper motors\u003c\/strong\u003e, which are known for their high torque and durability. Unlike DC servo motors, which can be damaged if they encounter a hard stop or an overloaded condition, stepper motors can handle significant strain without harming the electronics or gears. This makes the mount more robust and forgiving in real-world use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of telescope is a good match for the EXOS2-GT for imaging the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor imaging a large target like the Orion Nebula (M42), a wide-field refractor is an excellent choice. An 80mm to 102mm triplet apochromatic refractor, along with a camera and guide scope, would typically weigh between 15 and 25 lbs, well within the EXOS2-GT's \u003cstrong\u003e28 lb imaging capacity\u003c\/strong\u003e. This combination would provide a wide, flat field of view perfect for capturing the full expanse of the nebula.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the EXOS2-GT for visual observation with a 10\" f\/5 Newtonian telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, most likely. A typical 10-inch f\/5 Newtonian optical tube weighs around 25-30 lbs. This is well within the EXOS2-GT's \u003cstrong\u003e40 lb visual payload capacity\u003c\/strong\u003e. The mount would provide a solid, stable platform for observing planets and deep-sky objects with such an instrument, though it would be at the upper limit for serious astrophotography.\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\u003eMount Type\u003c\/td\u003e\n\u003ctd\u003eGerman Equatorial\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAstrophotography Payload\u003c\/td\u003e\n\u003ctd\u003e28 lbs (instrument weight)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVisual Payload\u003c\/td\u003e\n\u003ctd\u003e40 lbs (instrument weight)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGoTo System\u003c\/td\u003e\n\u003ctd\u003ePMC-Eight OpenGOTO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrive System\u003c\/td\u003e\n\u003ctd\u003eBelt-Driven Stepper Motors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnectivity\u003c\/td\u003e\n\u003ctd\u003eWiFi and Bluetooth®\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Software\u003c\/td\u003e\n\u003ctd\u003eExploreStars App (free)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Platforms\u003c\/td\u003e\n\u003ctd\u003eWindows 8.1\/10, Android, Amazon Fire, iOS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eASCOM Compatible\u003c\/td\u003e\n\u003ctd\u003eYes, with included driver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObject Database\u003c\/td\u003e\n\u003ctd\u003eOver 80,000 objects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Mount Weight\u003c\/td\u003e\n\u003ctd\u003e30 lbs (without counterweights)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHead Weight\u003c\/td\u003e\n\u003ctd\u003e13.4 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTripod Weight\u003c\/td\u003e\n\u003ctd\u003e13 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTripod\u003c\/td\u003e\n\u003ctd\u003eStainless Steel with 2\" diameter legs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTripod Height\u003c\/td\u003e\n\u003ctd\u003e26.8\" to 42.5\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCounterweights\u003c\/td\u003e\n\u003ctd\u003e2 x 11.25 lbs included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePolar Finder\u003c\/td\u003e\n\u003ctd\u003eIncluded, pre-installed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower\u003c\/td\u003e\n\u003ctd\u003eAC Adapter included\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\"\u003eEXOS2-GT Equatorial Mount Head with PMC-Eight\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\"\u003eStainless Steel Tripod with 2\" Legs\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\"\u003e11.25 lb Counterweight\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\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\"\u003eAC Adapter\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\"\u003eInstalled Polar-finder Scope\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_PMC-Eight_Precision_Motion_Controller_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":44967196098845,"sku":"ES-EXOS2GTPMCT3-01","price":1400.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-EXOS2-GT-Equatorial-Mount-with-PMC-Eight-GoTo-System-with-WiFi-and-Bluetooth-1_01b31e55-eee1-4c0f-8e4f-eab069c6c12b.jpg?v=1789060940"},{"product_id":"explore-scientific-twilight-medium-duty-tripod-white","title":"Explore Scientific Twilight Medium Duty Tripod (White)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDirect Stability Upgrade for the iEXOS-100 Mount\u003c\/li\u003e\n\u003cli\u003eFully Adjustable Stainless Steel Legs\u003c\/li\u003e\n\u003cli\u003eDie-Cast Aluminum Spreader Tray with Threaded T-Bar\u003c\/li\u003e\n\u003cli\u003eEngineered to Minimize Vibrations for Astrophotography\u003c\/li\u003e\n\u003cli\u003eIncreases the Effective Weight Capacity of Your Setup\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 Twilight Medium Duty Tripod (White)\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific Twilight Medium Duty \u003ca href=\"\/collections\/tripods-and-piers\"\u003eTripod\u003c\/a\u003e is the designated stability upgrade for the iEXOS-100 mount, replacing the standard tripod with a more robust foundation for observing and astrophotography. Featuring fully adjustable stainless steel legs anchored by a die-cast aluminum spreader tray, this tripod is engineered to support heavier imaging payloads. It provides a significant reduction in vibrations, ensuring your mount can track accurately without compromising the sharpness of your 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\u003eStainless Steel \u0026amp; Aluminum Construction: A Foundation for Imaging\u003c\/h3\u003e\n\u003cp\u003eThe core of the Twilight Medium Duty Tripod's stability lies in its materials. The adjustable legs are made from stainless steel, offering greater rigidity and vibration damping than the lighter aluminum legs found on entry-level tripods. This assembly is locked securely in place by a die-cast aluminum spreader tray and a threaded T-bar, creating a unified, stable structure from the ground up that resists flexing and settles quickly after 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\u003eThe Upgrade Path for the iEXOS-100 Mount\u003c\/h3\u003e\n\u003cp\u003eThis tripod is specifically offered as the solution for iEXOS-100 users who have expanded their setup beyond a simple optical tube. By increasing the stability of the mount's base, you can confidently add \u003ca href=\"\/collections\/autoguiding\"\u003eguide scopes\u003c\/a\u003e, larger cameras, and other accessories without overloading the system's capacity to damp vibrations. This upgrade is essential for imagers looking to get the best tracking and guiding performance from their iEXOS-100 mount. Please note that an azimuth adjuster adapter, sold separately, is required to connect the iEXOS-100 mount head to this tripod.\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\u003eTwilight Medium Duty vs. Stock iEXOS-100 Tripod: A Stability Upgrade\u003c\/h3\u003e\n\u003cp\u003eWhile the stock tripod included with the iEXOS-100 is designed for portability and casual visual use, the Twilight Medium Duty Tripod is built for imaging. The primary difference is the move from lighter materials to a heavier, more rigid stainless steel and die-cast aluminum construction.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStock Tripod Advantage:\u003c\/strong\u003e Lighter weight and maximum portability for grab-and-go observing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwilight MD Tripod Advantage:\u003c\/strong\u003e Superior vibration suppression and a higher effective payload capacity. This results in sharper stars, more consistent guiding, and less time waiting for oscillations to settle after focusing or during a light breeze.\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\"\u003eI want to use my iEXOS-100 with a refractor and guide scope. Is the Twilight Medium Duty Tripod necessary?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is the exact scenario where the Twilight Medium Duty Tripod becomes essential. Adding a guide scope and imaging camera increases the weight and changes the balance of your setup, making it more susceptible to vibrations. This tripod provides the stable base needed to handle the extra equipment and maintain sharp, guided exposures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Twilight Medium Duty Tripod improve my images of the Moon or Jupiter with my iEXOS-100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor high-resolution planetary and lunar imaging, stability is critical. The slightest vibration, even from focusing, can blur fine details like Jupiter's cloud bands or small lunar craters. The Twilight Medium Duty Tripod's robust construction damps these vibrations much faster than a standard tripod, allowing you to capture sharper video frames (SER files) for stacking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat do I need to attach my iEXOS-100 mount to the Twilight Medium Duty Tripod?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will need an \u003cstrong\u003eazimuth adjuster adapter\u003c\/strong\u003e from Explore Scientific. This component is sold separately and is required to properly mate the iEXOS-100 mount head to the top of the Twilight tripod.\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 Twilight Medium Duty Tripod's stainless steel legs?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is \u003cstrong\u003erigidity and mass\u003c\/strong\u003e. Stainless steel is denser and stiffer than aluminum, which means the legs are less prone to flexing under load and are more effective at absorbing and damping vibrations from wind or user adjustments.\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 Twilight Medium Duty Tripod with other mounts?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile this tripod is specifically designed and marketed as an upgrade for the Explore Scientific iEXOS-100 (with the appropriate adapter), its compatibility with other mounts would depend on the mounting bolt size and the base design of the mount head. It is not guaranteed to be compatible with other brands without potential modification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the spreader tray on the Twilight Medium Duty Tripod improve stability?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe die-cast aluminum spreader tray acts as a rigid brace, locking the legs at a fixed angle and preventing them from splaying outwards under the weight of the telescope. This triangulation creates a much more stable structure than a tripod without a robust spreader system, significantly reducing wobble and flex.\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\u003e811803032224\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":44967198130461,"sku":"ES-TL-ST2W-00","price":196.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-Twilight-Medium-Duty-Tripod-White-TL-ST2W-00-1__14532.1594240335.1280.1280.jpg?v=1684338793"},{"product_id":"explore-scientific-twilight-heavy-duty-tripod-black","title":"Explore Scientific Twilight Heavy Duty Tripod (Black)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eTripod Weight: 13.6 lb (6.2 kg)\u003c\/li\u003e\n\u003cli\u003eLeg Diameter: 2-inch Stainless Steel\u003c\/li\u003e\n\u003cli\u003eHeight Range: 26.5\" to 42.5\"\u003c\/li\u003e\n\u003cli\u003eCollapsed Length: 31.5\"\u003c\/li\u003e\n\u003cli\u003eCompatibility: Twilight I \u0026amp; iEXOS-100 Mounts\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 Twilight Heavy Duty Tripod (Black)\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific Twilight Heavy Duty Tripod provides a robust 13.6 lb (6.2 kg) platform, extending from a minimum height of 26.5 inches to a maximum of 42.5 inches for versatile observing stances. When collapsed for transport, it measures a compact 31.5 inches, delivering a critical stability upgrade for your Twilight I or iEXOS-100 mount.\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 13.6 lb Foundation with 2-Inch Steel Legs\u003c\/h3\u003e\n\u003cp\u003eWeighing in at 13.6 lb, this tripod establishes a far more rigid base than lighter, stock tripods, translating directly to shorter vibration damping times. The key to its stability is the set of 2-inch diameter stainless steel legs, which are locked firmly in place by a die-cast aluminum spreader tray and a secure threaded T-bar to prevent flexure under load.\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\u003eAdjustable from 26.5\" to 42.5\" for Twilight I \u0026amp; iEXOS-100 Mounts\u003c\/h3\u003e\n\u003cp\u003eThe tripod's operational height ranges from a low of 26.5 inches, ideal for seated viewing, up to 42.5 inches for comfortable standing observation. This tripod is specifically designed as a drop-in enhancement for the Explore Scientific Twilight I and iEXOS-100 mounts, allowing you to use heavier optical tubes or imaging gear without compromising the system's stability.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eiEXOS-100 Adapter Required:\u003c\/strong\u003e Please note that attaching an iEXOS-100 mount head requires a separate azimuth adjuster adapter, which is not included with the tripod.\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\u003eTwilight Heavy Duty vs. Standard Tripods: The Stability Difference\u003c\/h3\u003e\n\u003cp\u003eIf you've noticed vibrations when focusing your telescope or during light breezes, the standard tripod is often the limiting factor. The move to the Twilight Heavy Duty tripod addresses this issue directly through superior engineering and mass.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeg Diameter:\u003c\/strong\u003e The 2-inch steel legs offer a significant increase in rigidity and resistance to torsion compared to the smaller-diameter legs of most stock tripods.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMass for Damping:\u003c\/strong\u003e At 13.6 lb, the sheer weight of the tripod provides superior damping, settling vibrations from adjustments or wind much more quickly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpreader System:\u003c\/strong\u003e The robust die-cast spreader and T-bar create a more secure leg lock than simpler spreader designs, preventing instability when your mount is fully loaded.\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 much more stable will my Twilight I mount be with the Heavy Duty Tripod when using a 102mm refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary benefit is a dramatic reduction in vibration damping time. With a 102mm \u003ca href=\"\/collections\/refractors\"\u003erefractor\u003c\/a\u003e, you'll notice that vibrations from focusing or light wind settle almost immediately with the \u003cstrong\u003e13.6 lb Heavy Duty Tripod\u003c\/strong\u003e, compared to several seconds with a standard tripod. This is due to the larger \u003cstrong\u003e2-inch leg diameter\u003c\/strong\u003e and increased mass providing a more rigid platform.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Twilight Heavy Duty Tripod improve my guiding with an iEXOS-100 mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, a stable platform is critical for accurate guiding. The Twilight Heavy Duty Tripod minimizes micro-vibrations from the mount's motors and external sources like wind, providing a more solid foundation. This allows your \u003ca href=\"\/collections\/autoguiding\"\u003eautoguider\u003c\/a\u003e to make finer corrections, potentially leading to rounder stars. Remember, you will need the separate \u003cstrong\u003eazimuth adjuster adapter\u003c\/strong\u003e to connect the iEXOS-100.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the height range of the Explore Scientific Twilight Heavy Duty Tripod?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe tripod has an adjustable operating height ranging from \u003cstrong\u003e26.5 inches\u003c\/strong\u003e at its lowest setting to \u003cstrong\u003e42.5 inches\u003c\/strong\u003e when fully extended. When collapsed for transport, it measures \u003cstrong\u003e31.5 inches\u003c\/strong\u003e in length.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Twilight Heavy Duty Tripod with mounts other than the Twilight I or iEXOS-100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis tripod is designed with a specific mounting base for the \u003cstrong\u003eExplore Scientific Twilight I\u003c\/strong\u003e and \u003cstrong\u003eiEXOS-100\u003c\/strong\u003e mount heads. While it may be possible to adapt it for other small mounts with custom hardware, it is not a universal fit and compatibility with other brands is not guaranteed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 13.6 lb weight of the Twilight Heavy Duty Tripod difficult to transport?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt \u003cstrong\u003e13.6 lb (6.2 kg)\u003c\/strong\u003e, the tripod is substantial but remains portable for field use. It is heavier than a standard tripod, which is the source of its stability, but it is manageable for one person to carry and set up. Its collapsed length is \u003cstrong\u003e31.5 inches\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat adapter do I need for the Twilight Heavy Duty Tripod and my iEXOS-100 mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTo properly attach the iEXOS-100 mount head, you will need the \"azimuth adjuster adapter\" from Explore Scientific. This part is sold separately and is required for a secure and functional connection.\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\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e13.6 lb \/ 6.2 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Operating Height\u003c\/td\u003e\n\u003ctd\u003e42.5 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Operating Height\u003c\/td\u003e\n\u003ctd\u003e26.5 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCollapsed Height\u003c\/td\u003e\n\u003ctd\u003e31.5 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLeg Diameter\u003c\/td\u003e\n\u003ctd\u003e2 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e2-inch stainless steel legs, die-cast aluminum spreader tray\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTop plate \/ mount interface\u003c\/td\u003e\n\u003ctd\u003eTwilight I and iEXOS-100 (iEXOS-100 needs azimuth adjuster adapter, sold separately)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight Range\u003c\/td\u003e\n\u003ctd\u003e673 to 1080 (26.5 to 42.5 in)\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 Twilight Heavy Duty Tripod (Black)\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\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":44967198163229,"sku":"ES-TL-ST3B-00","price":489.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-Twilight-Heavy-Duty-Tripod-Black-TL-ST3B-00-1__77661.1594240336.1280.1280.jpg?v=1684338796"},{"product_id":"explore-scientific-2x-focal-extender-1-25","title":"Explore Scientific 2x Focal Extender - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDoubles the magnification of any 1.25\" eyepiece\u003c\/li\u003e\n\u003cli\u003eTelecentric optical design ensures a true 2x power factor\u003c\/li\u003e\n\u003cli\u003eMaintains the original eye relief of the eyepiece in use\u003c\/li\u003e\n\u003cli\u003eImproves image quality compared to standard Barlow lenses\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 2x Focal Extender - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 2x Focal Extender doubles the power of any 1.25\" \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e, effectively turning your existing accessory case into a collection with twice the magnification options. Its advanced telecentric optical design delivers a consistent and true 2x magnification factor, a critical advantage over traditional \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eBarlow lenses\u003c\/a\u003e, especially for astrophotography.\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\u003eTelecentric Design: A Stable 2x Magnification Factor\u003c\/h3\u003e\n\u003cp\u003eUnlike a standard Barlow, which uses a negative lens group, the Explore Scientific Focal Extender employs a multi-element telecentric design. This system produces light rays that exit parallel to the optical axis, ensuring the 2x magnification remains constant regardless of the distance to the eyepiece or camera sensor. This provides predictable, sharp, and evenly illuminated views across the entire field, which is essential for consistent results in both visual observation and imaging.\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\u003e2x Power While Preserving Eyepiece Eye Relief\u003c\/h3\u003e\n\u003cp\u003eOne of the most significant ergonomic benefits of this focal extender is its ability to preserve the native eye relief of your eyepiece. Lower-power eyepieces typically have more generous eye relief, and by using the 2x extender, you can achieve high magnification while enjoying that same comfortable viewing distance. This makes high-power observing sessions more accessible and comfortable, especially for 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\u003eFocal Extender vs. Traditional Barlow: Why Telecentric Matters\u003c\/h3\u003e\n\u003cp\u003eThe choice between a focal extender and a Barlow lens comes down to optical stability and intended use. While both increase magnification, their methods differ significantly, leading to different outcomes.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTraditional Barlow Lens:\u003c\/strong\u003e A Barlow's magnification can vary depending on how far the eyepiece is spaced from the lens. This can be useful for fine-tuning image scale but introduces unpredictability. The diverging light cone can also induce vignetting and degrade edge-of-field sharpness, especially in fast telescopes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific Focal Extender:\u003c\/strong\u003e The telecentric design provides a fixed, true 2x magnification that does not change with spacing. Its parallel light path is much gentler on complex eyepieces, preserving their designed optical corrections and maintaining image quality from the center to the edge of the field. This makes it the superior choice for imaging and for observers who demand consistency.\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 2x Focal Extender over a standard 2x Barlow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is its \u003cstrong\u003etelecentric optical design\u003c\/strong\u003e. This ensures a true, fixed 2x magnification regardless of eyepiece or camera spacing, providing more consistent and predictable results than a traditional Barlow lens, whose magnification can fluctuate with distance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Explore Scientific 2x Focal Extender help observers who wear eyeglasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis focal extender preserves the original eye relief of the eyepiece you pair it with. You can use a comfortable, long-eye-relief, low-power eyepiece to achieve high magnification, allowing you to keep your glasses on and still see the entire field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have a 25mm eyepiece for my 8\" f\/10 SCT. What will the Explore Scientific 2x Focal Extender do?\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, your 25mm eyepiece provides about 81x magnification. Adding the Explore Scientific 2x Focal Extender will double that to approximately 162x, giving you a much closer view of planetary detail on objects like Jupiter or Saturn, all while you continue to use your comfortable 25mm eyepiece.\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 2x Focal Extender to image Jupiter with my planetary camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The telecentric design is ideal for planetary imaging. It increases your telescope's effective focal length by a precise 2x factor, enlarging the planet on your camera sensor without introducing the optical aberrations that can occur with standard Barlow lenses in an imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Explore Scientific 2x Focal Extender work with my specialty eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the parallel light path from the telecentric design is much more forgiving on complex, wide-field eyepieces than the steep light cone from a Barlow. It helps maintain the high-quality performance your premium eyepieces were designed to deliver, even at double the power.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes adding the Explore Scientific 2x Focal Extender reduce image brightness?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAny time you increase magnification, the image will become dimmer because the same amount of light is spread over a larger area. While the multi-coated optics in the focal extender are highly efficient, the dimming you perceive is a direct and unavoidable consequence of the 2x increase in magnification, not a loss of light through the device itself.\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\u003e812257010417\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification\u003c\/td\u003e\n\u003ctd\u003e2x\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\u003eElements\u003c\/td\u003e\n\u003ctd\u003eMulti-element telecentric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e260 g\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 2x Focal Extender - 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\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":44967198392605,"sku":"ES-FE02-125","price":167.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-1-25-inch-2x-Focal-Extender-FE02-125-1__57406.1594240336.1280.1280.jpg?v=1684338801"},{"product_id":"explore-scientific-3x-focal-extender-1-25","title":"Explore Scientific 3X Focal Extender - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eInstantly triples the magnification of any 1.25\" eyepiece\u003c\/li\u003e\n\u003cli\u003eTelecentric optical design provides consistent magnification\u003c\/li\u003e\n\u003cli\u003eMaintains the eye relief of the original eyepiece\u003c\/li\u003e\n\u003cli\u003eImproves image quality compared to standard Barlow lenses\u003c\/li\u003e\n\u003cli\u003eIdeal for high-power planetary viewing and imaging\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 3X Focal Extender - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 3X Focal Extender instantly triples the power of any 1.25\" \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e in your collection. This telecentric design turns three of your favorite low-power eyepieces into a versatile set offering six distinct magnifications, unlocking high-power views without sacrificing optical integrity or viewing comfort.\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\u003eTriple Your Magnification with a 1.25\" Barrel\u003c\/h3\u003e\n\u003cp\u003eThis focal extender multiplies the utility of your existing eyepiece case. By inserting this 3X extender, you can achieve magnifications typically reserved for short focal length eyepieces, which often have tight, uncomfortable eye relief. It allows you to push the power on clear nights to resolve fine detail on Jupiter's cloud bands or split tight double stars, all while using your familiar, comfortable long-focal-length 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\u003eTelecentric Optics: A Stable 3X Magnification Factor\u003c\/h3\u003e\n\u003cp\u003eUnlike a traditional \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eBarlow lens\u003c\/a\u003e, the Explore Scientific Focal Extender uses a multi-element telecentric design. This system ensures light rays exit parallel to the optical axis, delivering a true, fixed 3X magnification regardless of the distance between the extender and your eyepiece or camera sensor. This stability is critical for astrophotography, where precise focal length is required for accurate image scaling, and it eliminates the variable magnification that can occur with Barlows.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsistent Magnification:\u003c\/strong\u003e The 3X power factor remains constant, providing predictable and repeatable results for both visual observation and imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintained Eye Relief:\u003c\/strong\u003e You get to enjoy the generous eye relief of your lower-power eyepiece, a significant advantage for eyeglass wearers and for comfortable extended viewing sessions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproved Field Flatness:\u003c\/strong\u003e The telecentric design helps to reduce field curvature, resulting in sharper stars at the edge of the field compared to simpler amplifier 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\u003eFocal Extender vs. Barlow: Why the Telecentric Design Matters\u003c\/h3\u003e\n\u003cp\u003eWhile both devices increase magnification, their optical approach is fundamentally different. A standard Barlow's magnification factor changes as you alter its spacing from the eyepiece, which can be unpredictable. The Explore Scientific Focal Extender's telecentric design offers superior optical correction and stability.\u003c\/p\u003e\n\u003cp\u003eThis makes it the preferred choice for observers using premium, complex eyepieces or imagers who require a flat field and consistent focal length. The parallel light path is less demanding on eyepiece optics, preserving the original image quality without introducing additional aberrations.\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 difference between the Explore Scientific 3X Focal Extender and a standard 3X Barlow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary difference is the \u003cstrong\u003etelecentric optical design\u003c\/strong\u003e of the Focal Extender. This provides a fixed, consistent 3X magnification regardless of spacing. A standard Barlow's magnification can vary depending on its distance from the eyepiece or camera sensor. The telecentric design also better preserves the eye relief of the eyepiece and provides superior optical correction across the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the 3X Focal Extender affect my view of Saturn 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 (2032mm focal length), a 25mm eyepiece gives you 81x magnification. Adding the Explore Scientific 3X Focal Extender will increase that to 243x. This is an excellent magnification for resolving details like the Cassini Division in Saturn's rings and observing cloud bands on the planet itself, assuming steady atmospheric conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Explore Scientific 3X Focal Extender change the eye relief of my eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA key benefit of the telecentric design is that it largely \u003cstrong\u003epreserves the original eye relief\u003c\/strong\u003e of the eyepiece you use it with. This means you can achieve high power while still enjoying the comfortable, long eye relief of a lower-power eyepiece, which is especially beneficial for eyeglass wearers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 3X Focal Extender a good choice for planetary imaging with a high-frame-rate camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is an excellent choice. The telecentric design provides a flat field and ensures the magnification is a consistent 3X, which is critical for planetary imaging. It effectively triples your telescope's focal length, increasing the image scale on your camera sensor to make planets like Jupiter, Saturn, and Mars appear larger and more detailed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 1.25\" focal extender work with my 2\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this model is designed specifically for \u003cstrong\u003e1.25\" eyepieces and accessories\u003c\/strong\u003e. It will not fit 2\" eyepieces. You must use eyepieces with a 1.25\" barrel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs there a downside to using the Explore Scientific 3X Focal Extender?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eLike any device that triples magnification, the 3X Focal Extender will result in a dimmer image and make your telescope more sensitive to atmospheric instability (seeing). It requires good seeing conditions to deliver its best results. However, its superior optical design minimizes aberrations compared to simpler Barlow lenses.\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\u003eMagnification\u003c\/td\u003e\n\u003ctd\u003e3X\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\u003eTelecentric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257010394\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e249 g\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 3X Focal Extender - 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\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":44967198458141,"sku":"ES-FE03-125","price":195.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-1-25-inch-3X-Focal-Extender-FE03-125-1__93025.1594240336.1280.1280.jpg?v=1684338802"},{"product_id":"explore-scientific-5x-focal-extender-1-25","title":"Explore Scientific 5X Focal Extender - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDelivers a 5X magnification increase to any 1.25\" eyepiece\u003c\/li\u003e\n\u003cli\u003e1.25\" barrel diameter fits standard focusers and accessories\u003c\/li\u003e\n\u003cli\u003eTelecentric optical design provides consistent, true-to-spec magnification\u003c\/li\u003e\n\u003cli\u003eMaintains the original eye relief of the eyepiece for comfortable viewing\u003c\/li\u003e\n\u003cli\u003eIdeal for high-resolution planetary imaging and visual observation\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 5X Focal Extender - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 5X Focal Extender multiplies the power of any 1.25\" \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e by a factor of 5, transforming a basic eyepiece collection into a versatile high-power toolkit. Its advanced telecentric optical design maintains the comfortable eye relief of your lower-power eyepieces, delivering a significant jump in magnification without the typical eye strain associated with short focal length 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\u003e5X Power: A Major Leap in Magnification\u003c\/h3\u003e\n\u003cp\u003eA 5X power increase provides the high magnification needed to resolve fine details on planetary surfaces, split tight double stars, and examine the structure of small planetary nebulae. This focal extender effectively adds a new, very high-power option for every eyepiece you own, expanding your observing capabilities without requiring a whole new set of dedicated high-magnification eyepieces.\u003c\/p\u003e\n\u003cp\u003eThis significant boost in magnification will result in a dimmer image, a necessary trade-off for increased image scale. For this reason, the 5X Focal Extender performs best on bright targets like the Moon, Jupiter, Saturn, and Mars, where light grasp is plentiful.\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\u003eTelecentric Design: Consistent 5X Magnification for Imaging \u0026amp; Visual\u003c\/h3\u003e\n\u003cp\u003eUnlike a traditional \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eBarlow lens\u003c\/a\u003e, the Explore Scientific Focal Extender uses a telecentric design. This multi-element system ensures light rays exit the extender parallel to the optical axis, which results in a fixed, true-to-spec magnification factor regardless of the distance between the extender and the eyepiece or camera sensor.\u003c\/p\u003e\n\u003cp\u003eThis consistency is critical for astrophotography. Whether you add a \u003ca href=\"\/collections\/filter-wheels\"\u003efilter wheel\u003c\/a\u003e or an \u003ca href=\"\/collections\/autoguiding\"\u003eoff-axis guider\u003c\/a\u003e, the image scale remains a predictable 5X. For visual observers, this design contributes to sharp performance across the entire field of view, especially in faster 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\u003ePreserving Eye Relief: High Power Without the Discomfort\u003c\/h3\u003e\n\u003cp\u003eHigh-power eyepieces are notoriously difficult to look through, often featuring very short eye relief that forces you to press your eye against the lens. The 5X Focal Extender solves this problem by allowing you to use your comfortable, long-eye-relief, low-power eyepieces for high-magnification views.\u003c\/p\u003e\n\u003cp\u003eYou can insert a 25mm Plössl with 15mm of eye relief and get the power of a 5mm eyepiece while retaining that comfortable 15mm of eye relief. This is a significant advantage for all observers and is especially beneficial for 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\u003eFocal Extender vs. Traditional Barlow Lens: Why Telecentric Matters\u003c\/h3\u003e\n\u003cp\u003eWhile a conventional Barlow lens is a simple and effective way to increase magnification, its performance is variable. A Barlow's magnification factor changes depending on its distance from the eyepiece, making it difficult to achieve a precise, repeatable image scale. The telecentric Focal Extender, by contrast, delivers a constant 5X magnification factor.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePredictable Magnification:\u003c\/strong\u003e The extender's 5X power is fixed, which is essential for calculating image scales in planetary imaging setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproved Edge Correction:\u003c\/strong\u003e The parallel light rays from the telecentric design often result in sharper star images at the edge of the field compared to a simple Barlow, particularly in telescopes with fast focal ratios.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintained Eye Relief:\u003c\/strong\u003e The Focal Extender is explicitly designed to preserve the eye relief of the eyepiece it's paired with, a feature not always prioritized in standard Barlow 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 is the main advantage of the Explore Scientific 5X Focal Extender over a standard 5X Barlow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is its \u003cstrong\u003etelecentric design\u003c\/strong\u003e. This ensures the Explore Scientific 5X Focal Extender provides a consistent and precise 5X magnification, regardless of its spacing from a camera or eyepiece. A standard Barlow's magnification can vary with distance, making it less predictable for imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Explore Scientific 5X Focal Extender work with my 2\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This model of the Explore Scientific 5X Focal Extender is designed with a \u003cstrong\u003e1.25\" barrel\u003c\/strong\u003e and is only compatible with 1.25\" eyepieces and accessories. It will not fit into a 2\" \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e without an adapter, and it cannot accept 2\" eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Explore Scientific 5X Focal Extender perform for imaging Jupiter with my 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn 8\" f\/10 SCT has a focal length of around 2000mm. The Explore Scientific 5X Focal Extender will increase this to an effective focal length of 10,000mm (f\/50). This very long focal length is excellent for achieving a large image scale on Jupiter with a \u003ca href=\"\/collections\/planetary-cameras\"\u003eplanetary camera\u003c\/a\u003e, allowing you to capture fine details in its cloud bands and the Great Red Spot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI wear glasses. How does the Explore Scientific 5X Focal Extender help with high-magnification viewing of the Moon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Explore Scientific 5X Focal Extender allows you to use a low-power eyepiece, which typically has long and comfortable eye relief, to achieve high magnification. For example, you can use a 32mm Plössl (which you can easily use with glasses on) to get the power of a 6.4mm eyepiece, making detailed lunar observation comfortable without needing to remove your glasses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Explore Scientific 5X Focal Extender reduce the field of view?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Any device that increases magnification will inherently reduce the true field of view by the same factor. When using the Explore Scientific 5X Focal Extender, the patch of sky you see will be 5 times smaller, but the objects within it will appear 5 times larger.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a 5X magnification increase from the Explore Scientific Focal Extender too much for my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA 5X increase is substantial and may exceed the practical magnification limit of your telescope, especially on nights with poor atmospheric seeing. It is best suited for bright targets like the Moon and planets in telescopes with excellent optics and stable seeing conditions. For smaller telescopes or nights of average seeing, a 2X or 3X focal extender may provide more consistently sharp 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\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e5X\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\u003e812257010387\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e260 g\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 5X Focal Extender - 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\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific USA One Year\/Limited Extended Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967198523677,"sku":"ES-FE05-125","price":181.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-1-25-inch-5X-Focal-Extender-FE05-125-1__66175.1594240337.1280.1280.jpg?v=1684338804"},{"product_id":"explore-scientific-2x-focal-extender-2","title":"Explore Scientific 2X Focal Extender - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2X Focal Extender\u003c\/li\u003e\n\u003cli\u003e2-inch Barrel with 1.25-inch Adapter\u003c\/li\u003e\n\u003cli\u003eTelecentric Optical Design\u003c\/li\u003e\n\u003cli\u003eFully EMD-Coated Optics\u003c\/li\u003e\n\u003cli\u003eEdge-Blackened Lens Elements\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 2X Focal Extender - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 2X Focal Extender doubles the power of your entire \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e collection, accepting both 1.25-inch and 2-inch formats for maximum compatibility. Its telecentric optical design delivers a consistent 2X magnification factor, unlike a traditional \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eBarlow lens\u003c\/a\u003e, ensuring predictable, high-contrast views for both visual astronomy and astrophotography.\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\u003e2X Power for All Your Eyepieces: 1.25\" and 2\" Compatibility\u003c\/h3\u003e\n\u003cp\u003eThis 2-inch focal extender instantly doubles the utility of your eyepiece case. By providing 2X magnification, it allows a set of three eyepieces to deliver six different powers, filling gaps in your magnification range without the cost of new eyepieces. Its versatile design accepts both 2-inch and 1.25-inch eyepieces, ensuring it works with every eyepiece you own, from wide-field sweepers to high-power planetary models.\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 True 2X Telecentric Design for Superior Contrast\u003c\/h3\u003e\n\u003cp\u003eUnlike a standard Barlow lens whose magnification can change with distance, the Explore Scientific 2X Focal Extender uses a multi-element telecentric design. This advanced optical system ensures light rays remain parallel to the optical axis, delivering a fixed, true-to-spec 2X magnification regardless of eyepiece or camera spacing. To maximize image fidelity, all air-to-air lens surfaces are fully EMD-coated and all lens elements are edge-blackened, which together suppress internal reflections and produce a darker background sky with superior 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\u003eMaintain Comfortable Eye Relief at 2X Magnification\u003c\/h3\u003e\n\u003cp\u003eOne of the greatest advantages of a focal extender is its ability to preserve the comfortable eye relief of your low-power eyepieces. When you use this 2X extender with a long eye relief 30mm or 40mm eyepiece, you get the benefit of high magnification without the tight, uncomfortable eye placement typical of short focal length eyepieces. This is a significant advantage for eyeglass wearers and for anyone conducting long, relaxed observing sessions 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\"\u003eHow is the Explore Scientific 2X Focal Extender different from a standard 2X Barlow lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe key difference is its \u003cstrong\u003etelecentric optical design\u003c\/strong\u003e. A traditional Barlow's magnification changes depending on its distance from the eyepiece or camera sensor. The Explore Scientific Focal Extender delivers a constant, true 2X magnification factor, providing more consistent and predictable results for both visual use and imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use my 1.25\" eyepieces with this 2-inch Explore Scientific Focal Extender?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Explore Scientific 2X Focal Extender is designed to be versatile and accepts both 2-inch and 1.25-inch eyepieces and accessories. This allows you to double the magnification of your entire eyepiece collection with a single device.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Explore Scientific 2X Focal Extender help me see more detail on Jupiter with my 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. Using the 2X Focal Extender with a low-to-mid power eyepiece in your 8\" \u003ca href=\"\/collections\/schmidt-cassegrain-telescopes\"\u003eSchmidt-Cassegrain\u003c\/a\u003e will double the magnification, making it easier to resolve fine details like cloud bands on Jupiter, the Cassini Division in Saturn's rings, and small craterlets on the Moon. It allows you to reach the ideal planetary magnification while using an eyepiece with more comfortable eye relief.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this 2X Focal Extender preserve the eye relief of my eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, and this is one of its primary benefits. When you use the Explore Scientific 2X Focal Extender, you retain the generous eye relief of the eyepiece it's paired with. This lets you enjoy high-power views without the eyestrain or \"squinting\" associated with short focal length eyepieces, a feature especially valuable for observers who wear glasses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 2X Focal Extender suitable for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The telecentric design is ideal for imaging because it provides a consistent magnification factor and a flatter field than many standard Barlows. It's an excellent choice for increasing your image scale for planetary, lunar, and solar imaging with the appropriate filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will this extender perform with a 24mm 82-degree eyepiece in my 10\" f\/4.7 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn this setup, the Explore Scientific 2X Focal Extender will effectively turn your 24mm eyepiece into a 12mm eyepiece, doubling the magnification for high-power views of globular clusters like M13 or planetary nebulae like the Ring Nebula (M57). You get the power of a 12mm eyepiece while enjoying the comfortable eye relief and immersive feel of your 24mm 82-degree 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\u003e812257010400\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification\u003c\/td\u003e\n\u003ctd\u003e2x\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\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 2X Focal Extender - 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\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":44967198589213,"sku":"ES-FE02-020","price":251.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-2-inch-2X-Focal-Extender-FE02-020-FE02-020-1__73557.1594240337.1280.1280.jpg?v=1684338671"},{"product_id":"explore-scientific-3x-focal-extender-2","title":"Explore Scientific 3X Focal Extender - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eProvides 3X magnification for any 2\" or 1.25\" eyepiece\u003c\/li\u003e\n\u003cli\u003eTelecentric optical design ensures consistent magnification\u003c\/li\u003e\n\u003cli\u003eFully EMD-coated optics for maximum light transmission\u003c\/li\u003e\n\u003cli\u003eEdge-blackened lens elements enhance image contrast\u003c\/li\u003e\n\u003cli\u003ePreserves the original eye relief of your eyepiece\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 3X Focal Extender - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 3X Focal Extender triples your \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e collection's magnification options, accepting both 2-inch and 1.25-inch eyepiece formats. Its telecentric optical design delivers a true 3X power factor that remains constant regardless of spacing, a critical advantage over traditional \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eBarlow lenses\u003c\/a\u003e for both visual observation and astrophotography.\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\u003eTriple Your Eyepiece Collection with 3X Power\u003c\/h3\u003e\n\u003cp\u003eThis 3X Focal Extender instantly expands the utility of your existing eyepieces. By placing it in your telescope's 2-inch \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e, you effectively give every eyepiece you own a second, higher-magnification version. An accessory case with three eyepieces now yields six distinct magnification choices, providing greater flexibility for targeting planets, double stars, and small deep-sky objects without needing to purchase a full new set of high-power 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\u003eTelecentric Design: A True 3X Magnification Factor\u003c\/h3\u003e\n\u003cp\u003eUnlike a standard Barlow, the Explore Scientific Focal Extender uses a telecentric design. This multi-element system ensures light rays exit the extender parallel to the optical axis, which produces a fixed, true-to-spec magnification factor. Whether you're using it for visual work or attaching a camera, the 3X power remains consistent, eliminating the variability that can occur with Barlows when eyepiece or camera spacing is altered.\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-Contrast Views for 2\" Eyepieces \u0026amp; Preserved Eye Relief\u003c\/h3\u003e\n\u003cp\u003eOptical quality is maintained through Enhanced Multilayer Deposition (EMD) coatings on all air-to-glass surfaces and edge-blackened lens elements. This combination maximizes light throughput while suppressing internal reflections, resulting in superior image contrast. A significant ergonomic advantage is that the extender preserves the native eye relief of the eyepiece in use, allowing you to enjoy the comfortable, long eye relief of a low-power eyepiece even at high magnifications—a crucial benefit for eyeglass wearers.\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\u003eFocal Extender vs. Barlow: Why a 3X Telecentric Matters\u003c\/h3\u003e\n\u003cp\u003eWhile a traditional Barlow lens may be lighter or less expensive, its simple design introduces optical trade-offs. The telecentric focal extender is engineered for more demanding applications where optical consistency is paramount.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsistent Magnification:\u003c\/strong\u003e A Barlow's magnification changes with distance from the eyepiece. The 3X Focal Extender's telecentric design locks the magnification at 3X, which is critical for repeatable imaging setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintained Image Quality:\u003c\/strong\u003e Telecentric extenders are better corrected for field curvature, keeping stars sharp across a wider field of view, especially in fast telescopes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParallel Light Path:\u003c\/strong\u003e The parallel light rays exiting the extender are less demanding on complex 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\"\u003eWhat is the main difference between the Explore Scientific 3X Focal Extender and a standard 3X Barlow lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary difference is the \u003cstrong\u003etelecentric optical design\u003c\/strong\u003e. This ensures the Explore Scientific 3X Focal Extender delivers a consistent 3X magnification regardless of its distance from the eyepiece or camera sensor. A standard Barlow's magnification can vary with spacing, making the focal extender a more precise tool for astrophotography and critical visual observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 2\" focal extender work with my 1.25\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Explore Scientific 3X Focal Extender is designed to accept both 2-inch and 1.25-inch eyepieces. It includes an adapter to securely hold your 1.25-inch accessories, making it a versatile addition to any setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes using the 3X Focal Extender affect the eye relief of my eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, and this is a major advantage. The focal extender is designed to \u003cstrong\u003epreserve the original eye relief\u003c\/strong\u003e of the eyepiece you use with it. This means you can enjoy the comfortable, long eye relief of a low-power eyepiece while observing at 3X the magnification, which is especially beneficial for eyeglass wearers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the 3X Focal Extender perform for imaging Jupiter with my 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt's an excellent choice for this scenario. An 8\" f\/10 SCT has a focal length of around 2000mm. The 3X Focal Extender will triple this to an effective focal length of 6000mm (f\/30). This provides the high image scale necessary to resolve fine details in Jupiter's cloud bands, such as the Great Red Spot (GRS) and smaller atmospheric storms, with a \u003ca href=\"\/collections\/planetary-cameras\"\u003eplanetary camera\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI want to see more detail in the Orion Nebula (M42) with my 100mm f\/7 refractor. Is this 3X extender the right tool?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt depends on your goal. For resolving the Trapezium cluster at the heart of M42, the 3X extender is perfect. However, the Orion Nebula is a large object, and tripling your magnification will significantly narrow your field of view, potentially cropping out the nebula's faint outer structures. For wide, expansive views of large nebulae, using a low-power eyepiece without the extender is usually preferred.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 2\" Focal Extender heavy enough to cause balance issues?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA 2-inch, multi-element accessory like this focal extender is substantially built and will add weight to the back of your telescope. It is always good practice to re-check your telescope's balance on its mount after inserting or removing heavy accessories to ensure smooth tracking and prevent strain on the motors.\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\u003e812257018567\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification\u003c\/td\u003e\n\u003ctd\u003e3x\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\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 3X Focal Extender - 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\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":44967198621981,"sku":"ES-FE03-020","price":251.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-2-inch-3X-Focal-Extender-FE03-020-FE03-020-1__19065.1594240337.1280.1280.jpg?v=1684338676"},{"product_id":"explore-scientific-2-field-flattener","title":"Explore Scientific Field Flattener for f\/5 to f\/7 Refractors","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCorrects field curvature for pinpoint stars edge-to-edge\u003c\/li\u003e\n\u003cli\u003eOptimized for refractor telescopes with f\/5 to f\/7 focal ratios\u003c\/li\u003e\n\u003cli\u003eRequires a precise 55mm (+\/- 2mm) back focus distance\u003c\/li\u003e\n\u003cli\u003eDesigned for astrophotography use only\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 Field Flattener for f\/5 to f\/7 Refractors\u003c\/h2\u003e\n\u003cp\u003eFor refractor telescopes with focal ratios from f\/5 to f\/7, the Explore Scientific Field Flattener corrects the inherent field curvature that causes elongated stars at the edge of an image. This photographic-only accessory produces a flat, sharp field across large sensors by requiring a precise 55mm distance from its mounting flange to your camera's sensor.\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\u003ePinpoint Stars Edge-to-Edge in f\/5 to f\/7 Refractors\u003c\/h3\u003e\n\u003cp\u003eFast refractors produce stunning, high-contrast images, but their optics naturally create a curved focal plane. This results in coma, an aberration that smears stars near the corners of your photograph into comet-like shapes. The effect becomes more pronounced with larger camera sensors and faster focal ratios.\u003c\/p\u003e\n\u003cp\u003eThis Explore Scientific Field Flattener is optically matched to correct this specific aberration in refractors operating between f\/5 and f\/7. By inserting it into the optical train, you ensure that stars remain tight, round points from the center of the frame to the extreme corners, preserving the full resolution of your telescope and camera.\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\u003eAchieving the Critical 55mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eA field flattener's correction depends entirely on maintaining a specific distance to the camera sensor. This unit requires a rigid 55mm of back focus, with a tight tolerance of only +\/- 2mm, measured from the rear flange of the flattener to your camera's focal plane.\u003c\/p\u003e\n\u003cp\u003eThis 55mm spacing is standard for DSLR cameras using a T-ring, but will require a combination of extension tubes for most dedicated astronomy cameras. Achieving this precise distance is non-negotiable for optimal results; incorrect spacing will lead to over- or under-correction. Note that this is a 1.0x flattener, designed only to correct aberrations without reducing your telescope's focal length.\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 a field flattener and why do I need one for my Explore Scientific ED80 f\/6 refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA field flattener is an optical corrector that compensates for the natural curvature of a refractor's focal plane. An f\/6 refractor like the ED80 is fast enough to show noticeable star elongation (coma) in the corners of an image, especially with a larger sensor. The Explore Scientific Field Flattener is designed for the f\/5 to f\/7 range, making it a perfect match to ensure your astrophotos have sharp, pinpoint stars across the entire frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I get the correct 55mm spacing for the Field Flattener when imaging the Andromeda Galaxy (M31) with my ZWO ASI533MC Pro?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou must create a total distance of exactly 55mm between the flattener's rear flange and the ASI533MC Pro's sensor. The camera itself has a specific back focus distance (check its manual, often 6.5mm or 17.5mm depending on configuration). You will need to use a combination of threaded extension tubes (spacers) to make up the remaining distance to reach 55mm. For example, if your camera has 17.5mm of back focus, you would need 37.5mm of extensions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this Field Flattener work on my f\/8 refractor or my f\/4 Newtonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This flattener is optically designed specifically for \u003cstrong\u003erefractor telescopes\u003c\/strong\u003e in the \u003cstrong\u003ef\/5 to f\/7\u003c\/strong\u003e focal ratio range. Using it outside this designated range or with a different telescope design like a Newtonian will result in poor optical correction and unsatisfactory star shapes.\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 Field Flattener for visual observing with an eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this is a photographic-only accessory. It is not designed to work with an eyepiece and will not allow you to reach focus for visual use. It must be threaded directly into an imaging train with a camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eMy stars are still elongated after installing the Field Flattener. What's wrong?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe most common cause of poor correction is incorrect back focus. The required 55mm distance has a very small tolerance of only +\/- 2mm. Even a small error in your spacer calculations can degrade the result. Meticulously check the back focus of your camera and the length of all extensions in your imaging train to ensure the total distance is exactly 55mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this accessory change the focal length of my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This is a 1.0x field flattener, not a focal reducer. It is engineered to correct optical aberrations without altering the native focal length or focal ratio of your 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\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e811803034297\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Compatibility\u003c\/td\u003e\n\u003ctd\u003eRefractors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio Range\u003c\/td\u003e\n\u003ctd\u003ef\/5 to f\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired Back Focus\u003c\/td\u003e\n\u003ctd\u003e55mm (+\/- 2mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e1.0x (Flattener only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntended Use\u003c\/td\u003e\n\u003ctd\u003ePhotographic Only\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\"\u003eField Flattener for f\/5 to f\/7 Refractors\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\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":44967198687517,"sku":"ES-FF2F5\/F7","price":196.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-Field-Flattener-f-5-to-f-7-1_d768abfe-a4e9-4838-ac0f-dc68f35b60f2.jpg?v=1789061650"},{"product_id":"explore-scientific-3-field-flattener-7x-focal-reducer","title":"Explore Scientific 3\" Field Flattener .7x Focal Reducer","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces focal ratio by a factor of 0.7x for wider fields and shorter exposures\u003c\/li\u003e\n\u003cli\u003eFunctions as a field flattener to correct edge-of-field aberrations\u003c\/li\u003e\n\u003cli\u003eEngineered for Explore Scientific 127mm and 152mm APO refractors\u003c\/li\u003e\n\u003cli\u003eRequires a precise 55mm back focus from the rear of the unit\u003c\/li\u003e\n\u003cli\u003eFeatures fully multi-coated optics for maximum light transmission\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 3\" Field Flattener .7x Focal Reducer\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 3\" Field Flattener and 0.7x \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003eFocal Reducer\u003c\/a\u003e is an essential imaging accessory that corrects optical aberrations while simultaneously speeding up your photographic system. Designed for Explore Scientific's 127mm and 152mm refracting telescopes, it transforms a native f\/8 instrument into a faster f\/5.6 imaging platform, reducing exposure times by nearly 50%. This corrector provides a critical 55mm of back focus and is confirmed to deliver excellent results with \u003ca href=\"\/collections\/refractors\"\u003erefractors\u003c\/a\u003e operating at both f\/8 and f\/7.5.\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\u003eDual-Function Optics: A 0.7x Reducer for Faster Imaging\u003c\/h3\u003e\n\u003cp\u003eThis accessory performs two critical roles for the astrophotographer. As a focal reducer, its 0.7x magnification factor makes your telescope optically \"faster,\" widening your field of view and concentrating starlight onto your camera's sensor. This allows you to capture faint details with significantly shorter exposure times and fit larger deep-sky objects, like the Andromeda Galaxy (M31), into a single frame.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWider Field of View:\u003c\/strong\u003e Capture expansive nebulae and large star clusters without creating a mosaic.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrighter Images:\u003c\/strong\u003e By reducing the f-ratio, the reducer increases image brightness, improving your signal-to-noise ratio in less time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully Multi-Coated:\u003c\/strong\u003e High-transmission coatings on all optical surfaces ensure that the maximum amount of light reaches your sensor, preserving contrast and detail.\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\u003eTack-Sharp Stars to the Edge of the Field\u003c\/h3\u003e\n\u003cp\u003eRefractor telescopes naturally create a curved focal plane, which means that while the center of your image may be in perfect focus, stars towards the corners can appear elongated and soft. This 3\" field flattener is engineered to counteract this effect, producing a flat, corrected field of view that is essential for modern high-resolution sensors. The result is crisp, pinpoint stars from one edge of the frame to the other.\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\u003eAchieving 55mm Back Focus with Explore Scientific Focusers\u003c\/h3\u003e\n\u003cp\u003eProper spacing is the most critical element for any flattener or reducer. This unit requires a precise sensor distance of 55mm, measured from the rear face of the reducer housing. The M42x0.75 T-thread adapter takes up 3mm of this distance, meaning your camera sensor must be placed exactly 52mm from the shoulder of the \u003ca href=\"\/collections\/imaging-adapters\"\u003eT-adapter\u003c\/a\u003e. This accessory includes an adapter for the Explore Scientific 2-inch rack-and-pinion focuser, but connecting to the 2.5-hex focuser on the 127mm APO requires a separate adapter (part #510366).\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 correct back focus for the ES 3\" 0.7x Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe required back focus is \u003cstrong\u003e55mm\u003c\/strong\u003e, measured from the rear flange of the reducer unit itself. The standard M42x0.75 T-thread adapter uses 3mm of this distance, leaving you with a \u003cstrong\u003e52mm\u003c\/strong\u003e spacing requirement between the adapter and your camera's sensor. This is a common distance for DSLR cameras with a standard T-ring.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich Explore Scientific telescopes are compatible with this 3\" 0.7x reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis reducer\/flattener is specifically recommended for the Explore Scientific \u003cstrong\u003e127mm and 152mm APO triplet refractors\u003c\/strong\u003e. It is not designed for use with their doublet refractors. It has been tested and confirmed to perform exceptionally well with optical systems at both f\/8 and f\/7.5.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a special adapter for my Explore Scientific 127mm APO refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, most likely. The ES 127mm \u003ca href=\"\/collections\/apochromatic-refractors\"\u003eAPO refractor\u003c\/a\u003e typically ships with a 2.5-hex focuser. To connect this 3\" reducer, you must purchase the specific adapter, part number \u003cstrong\u003e510366\u003c\/strong\u003e. The reducer does include an adapter for the Explore Scientific 2-inch rack-and-pinion focuser, but this is not the standard focuser on the 127mm model.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the 0.7x reduction help when imaging the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 0.7x reduction provides a wider field of view, which is essential for framing large emission nebulae like the North American Nebula (NGC 7000) in their entirety, especially with larger sensors. It also makes your telescope faster (e.g., f\/8 becomes f\/5.6), significantly reducing the exposure time needed to capture the faint, expansive clouds of hydrogen-alpha gas.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between a focal reducer and a field flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis accessory combines both functions, but they solve different problems:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eA \u003cstrong\u003eFocal Reducer\u003c\/strong\u003e shortens the effective focal length of your telescope. This makes the image brighter and the field of view wider.\u003c\/li\u003e\n\u003cli\u003eA \u003cstrong\u003eField Flattener\u003c\/strong\u003e corrects for the natural curvature of a refractor's focal plane, ensuring stars are sharp and round across the entire image, not just in the center.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Explore Scientific 3\" reducer for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis device is designed and optimized specifically for astrophotography. Its optical corrections are calculated to produce a flat field on a camera sensor at a precise 55mm distance. It is not intended for visual use with an \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e and will not perform as a standard visual accessory.\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\u003eAccessory Type\u003c\/td\u003e\n\u003ctd\u003eField Flattener \u0026amp; Focal Reducer\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\u003eFocal Reduction\u003c\/td\u003e\n\u003ctd\u003e0.7x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired Back Focus\u003c\/td\u003e\n\u003ctd\u003e55mm from rear face of unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003eM42x0.75 T-Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Telescopes\u003c\/td\u003e\n\u003ctd\u003eExplore Scientific 127mm \u0026amp; 152mm APOs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended F-Ratios\u003c\/td\u003e\n\u003ctd\u003ef\/7.5 to f\/8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptics\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257014408\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e635 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope-side connection\u003c\/td\u003e\n\u003ctd\u003eThreaded adapter for ES 2\" rack-and-pinion focuser (2.5\" hex: adapter 510366)\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\"\u003e3in field flattener\/0.7x reducer\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\"\u003ethreaded adapter for the ES 2in rack-and-pinion focuser\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\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":44967198720285,"sku":"ES-FFFR507X-00","price":559.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-3-inch-Field-Flattener-7x-Focal-Reducer-FFFR507X-00-FFFR507X-00-1__88587.1594240338.1280.1280.jpg?v=1684338681"},{"product_id":"explore-scientific-hr-variable-coma-corrector-2","title":"Explore Scientific HR Variable Coma Corrector (2-inch)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCorrects for off-axis coma in Newtonian reflectors\u003c\/li\u003e\n\u003cli\u003eDesigned for 2-inch focusers\u003c\/li\u003e\n\u003cli\u003eVariable spacer with markings for fine-tuning\u003c\/li\u003e\n\u003cli\u003eEMC (Enhanced Multilayer Coatings) for high contrast\u003c\/li\u003e\n\u003cli\u003eOptical design by Harrie Rutten\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 HR Variable Coma Corrector (2-inch)\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific HR Variable Coma Corrector is a 2-inch optical corrector designed to eliminate the distracting, comet-like stars at the edge of the field in Newtonian telescopes. This model is optimized for visual observation and is protected by a one-year warranty, which can be extended for the life of the product by registering within 60 days.\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\u003eEliminating Off-Axis Coma in 2-inch Focusers\u003c\/h3\u003e\n\u003cp\u003eComa is an inherent optical aberration in parabolic mirrors that renders stars at the edge of the field of view as unnatural, comet-shaped flares. The HR Coma Corrector is engineered to counteract this effect, ensuring stars remain sharp, point-like sources of light across the entire image, a critical factor for both immersive visual observation and wide-field astrophotography.\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\u003eHarrie Rutten Design with EMC Coatings\u003c\/h3\u003e\n\u003cp\u003eDesigned by renowned optical designer Harrie Rutten, this corrector delivers high-end optical fidelity. All air-to-glass surfaces feature Explore Scientific's Enhanced Multilayer Coatings (EMC), which minimize internal reflections and light scatter. The result is a darker background sky and increased image contrast, allowing faint details in galaxies and nebulae to stand out more 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\u003eVariable Spacer for Newtonian Compatibility\u003c\/h3\u003e\n\u003cp\u003eTo achieve optimal correction, the distance between the corrector's lenses and the focal plane must be precise. The HR Coma Corrector incorporates an adjustable spacer with clear markings. This variability allows you to tune the corrector for peak performance in nearly any Newtonian with a parabolic primary mirror, including instruments with fast focal ratios that are notoriously demanding on optical 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\u003eVisual Optimization and Photographic Connection\u003c\/h3\u003e\n\u003cp\u003eThis version of the HR Coma Corrector is intended primarily for visual use and does not include adapters for a direct, threaded connection to a camera. However, imaging is still possible with additional components. To connect a camera, you can use a 2-inch to 1.25-inch adapter (such as SKU 510365) in the corrector, followed by a standard T-adapter appropriate for your specific camera body.\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 coma and why do I need the HR Variable Coma Corrector?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eComa\u003c\/strong\u003e is an optical aberration common in Newtonian telescopes that makes stars at the edge of the field of view appear distorted, like small comets. The HR Variable Coma Corrector is an optical accessory that corrects this distortion, making stars appear as sharp points across the entire field for more pleasing views and images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this HR Coma Corrector for astrophotography with my DSLR?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, but not out of the box. This model does not include the threaded adapters for a direct camera connection. You will need to purchase a separate \u003cstrong\u003e2-inch to 1.25-inch adapter\u003c\/strong\u003e and a \u003cstrong\u003eT-ring\u003c\/strong\u003e for your specific camera model to attach it for astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I adjust the HR Variable Coma Corrector for my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe corrector features a built-in \u003cstrong\u003evariable spacer with markings\u003c\/strong\u003e. This allows you to change the distance of the optics to match your telescope's specific focal ratio and focuser position. You can make small adjustments to find the setting that produces the sharpest stars at the edge of your eyepiece's field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the HR Coma Corrector work with my fast f\/4 Dobsonian for observing the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The HR Coma Corrector is specifically designed to perform well even in fast Newtonians, like an f\/4 Dobsonian. When observing large objects like the Andromeda Galaxy (M31), the corrector will ensure that the stars framing the galaxy at the edge of your view are as sharp as the ones in the center.\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 EMC coatings on the HR Coma Corrector?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eEnhanced Multilayer Coatings (EMC)\u003c\/strong\u003e reduce the amount of light lost to reflection as it passes through the corrector's lenses. This increases overall light throughput and, more importantly, enhances contrast by minimizing internal glare and ghosting, resulting in a darker sky background and more vibrant celestial objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this HR Coma Corrector improve views of globular clusters like M13 in my 8-inch f\/5 Newtonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. In an 8-inch f\/5 Newtonian, a globular cluster like the Hercules Cluster (M13) can fill a low-power eyepiece. Without a corrector, the stars on the periphery of the cluster would appear elongated. The HR Coma Corrector will sharpen those outer stars, improving the aesthetic of the view and helping you resolve more of the cluster's dense core.\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\u003eFocuser Size\u003c\/td\u003e\n\u003ctd\u003e2-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eEnhanced Multilayer Coatings (EMC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Application\u003c\/td\u003e\n\u003ctd\u003eNewtonian Reflectors\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 HR Variable Coma Corrector (2-inch)\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\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific 1-Year Limited Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967198753053,"sku":"ES-HRCC02-00","price":350.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-HR-Variable-Coma-Corrector-2-inch-1_c61becd1-457c-4772-8a34-e7e192344ca8.jpg?v=1789061625"},{"product_id":"explore-scientific-99-reflective-diagonal-2","title":"Explore Scientific 99% Reflective Diagonal -2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2-inch Diagonal Barrel with Tapered Safety Edge\u003c\/li\u003e\n\u003cli\u003e99% Reflectivity from Dielectric Coatings\u003c\/li\u003e\n\u003cli\u003eIncludes 1.25-inch Eyepiece Adapter\u003c\/li\u003e\n\u003cli\u003eCompression Ring Locks on Both Eyepiece Holders\u003c\/li\u003e\n\u003cli\u003eProtects Telescope Optics with Included Dust Covers\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 99% Reflective Diagonal - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 99% Reflective Diagonal directs light from your 2-inch \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e to your eyepiece with minimal loss, using advanced dielectric coatings to achieve 99% reflectivity. This package includes a 1.25-inch adapter, allowing you to use eyepieces of both standard barrel sizes while maintaining a bright, high-contrast image path for your \u003ca href=\"\/collections\/refractors\"\u003erefractor\u003c\/a\u003e or catadioptric 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\u003e99% Dielectric Coatings for Maximum Brightness\u003c\/h3\u003e\n\u003cp\u003eA standard diagonal mirror can lose between 5% and 12% of the light gathered by your telescope, dimming faint details on planets and deep-sky objects. The Explore Scientific diagonal uses multi-layer dielectric coatings on its first-surface mirror to reflect 99% of incoming light, preserving the brightness and contrast your main optics deliver. This difference is immediately noticeable on faint galaxies or the subtle cloud bands of Jupiter.\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\u003eSecure 2\" and 1.25\" Connections: Compression Rings \u0026amp; Tapered Barrel\u003c\/h3\u003e\n\u003cp\u003eThis diagonal's mechanical design protects both your equipment and your views. Compression ring locks on both the 2-inch holder and the 1.25-inch adapter gently clamp your eyepieces without marring their barrels, ensuring a secure and centered fit. The 2-inch insert barrel features a double taper, which prevents the diagonal from falling out of the focuser if a set screw accidentally loosens.\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\u003eWhy a 99% Dielectric Diagonal Matters vs. Standard Aluminum\u003c\/h3\u003e\n\u003cp\u003eWhile a standard enhanced aluminum diagonal offers around 95% reflectivity when new, its coatings are soft and degrade over time with exposure and cleaning. Dielectric coatings are far more durable—almost as hard as the glass itself—ensuring the 99% reflectivity lasts for the life of the diagonal. For visual observers chasing the faintest details, that extra few percent of light can be the difference between seeing a spiral arm in a galaxy and missing it entirely.\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 99% Reflective Diagonal over a standard one?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is \u003cstrong\u003elight transmission\u003c\/strong\u003e. The Explore Scientific diagonal's dielectric coatings reflect 99% of light, compared to 88-95% for standard aluminum or silver diagonals. This results in a visibly brighter image, which is critical for observing faint deep-sky objects. These coatings are also far more durable and resistant to aging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I notice a difference with the Explore Scientific 99% diagonal on faint objects like the Veil Nebula (NGC 6960) in my SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. On faint, extended objects like the Veil Nebula (NGC 6960) or the Horsehead Nebula (Barnard 33), maximizing light throughput is essential. The jump from a standard 90% diagonal to this 99% model provides a noticeable boost in contrast and brightness, especially when using \u003ca href=\"\/collections\/nebula-filters\"\u003enebula filters\u003c\/a\u003e like an O-III or H-beta.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the compression ring on the Explore Scientific 2\" diagonal protect my eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eInstead of a single set screw that digs into the eyepiece barrel, a compression ring provides a firm, even grip around the entire circumference. This prevents the ugly scratches and gouges that set screws can cause, preserving the value and finish of your expensive 2-inch and 1.25-inch eyepieces.\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 99% diagonal with my 1.25-inch eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The diagonal comes with a \u003cstrong\u003e1.25-inch adapter\u003c\/strong\u003e that fits securely into the 2-inch \u003ca href=\"\/collections\/visual-adapters\"\u003eeyepiece holder\u003c\/a\u003e. This adapter also uses a compression ring lock, so your 1.25-inch eyepieces receive the same non-marring protection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI use a refractor for planetary observing. Does a 99% reflective diagonal offer any benefit for Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile planets like Jupiter are bright, a 99% reflective diagonal still provides a significant benefit. By minimizing light scatter and maximizing transmission, it improves image contrast, making it easier to resolve fine details like small ovals in the cloud belts, subtle colors in the Great Red Spot, and the faint crepe ring of Saturn.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes a dielectric diagonal like the Explore Scientific 2\" model introduce any color error?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. High-quality, multi-layer dielectric mirror coatings are designed to be color-neutral across the entire visual spectrum. Unlike some less expensive diagonals, the Explore Scientific 99% diagonal will not introduce any false color or tint to the image, ensuring the view remains as pure as your telescope's objective lens can deliver.\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\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2 Inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflectivity\u003c\/td\u003e\n\u003ctd\u003e99%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating Type\u003c\/td\u003e\n\u003ctd\u003eDielectric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Adapter\u003c\/td\u003e\n\u003ctd\u003e1.25\" Included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Holder\u003c\/td\u003e\n\u003ctd\u003eCompression Ring Lock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257010264\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e450 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope-Side Connection\u003c\/td\u003e\n\u003ctd\u003e2\" barrel\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 2\" Dielectric Diagonal\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\"\u003e1.25\" Eyepiece Adapter\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 Cover (Telescope Side)\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 Cover (Eyepiece Side)\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\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":44967198884125,"sku":"ES-DD02-00CF","price":307.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-99-Reflective-2-inch-Diagonal-DD02-00CF-1__77122.1594240339.1280.1280.jpg?v=1684338697"},{"product_id":"explore-scientific-99-reflective-diagonal-3","title":"Explore Scientific 99% Reflective Diagonal -3\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e3-inch diagonal body for large format focusers\u003c\/li\u003e\n\u003cli\u003e99% reflectivity from durable dielectric coatings\u003c\/li\u003e\n\u003cli\u003eIncludes a 2-inch eyepiece adapter with compression ring\u003c\/li\u003e\n\u003cli\u003eDouble-tapered barrel prevents accidental falls\u003c\/li\u003e\n\u003cli\u003eSolid, lightweight 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 99% Reflective Diagonal - 3\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 3-inch Dielectric Diagonal uses a first-surface mirror with a 99% reflective coating to deliver the brightest possible image from your telescope's focal plane to the eyepiece. Designed for telescopes with large 3-inch \u003ca href=\"\/collections\/focusers\"\u003efocusers\u003c\/a\u003e, this diagonal includes a 2-inch adapter, ensuring it can securely hold the most common large-format eyepieces and imaging 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\u003e99% Dielectric Coating: Maximizing Light Throughput to Your Eyepiece\u003c\/h3\u003e\n\u003cp\u003eA diagonal's primary job is to preserve the light collected by your telescope's main optic. The multi-layer dielectric coating on this mirror reflects 99% of incoming light, a noticeable improvement over standard aluminum or even enhanced aluminum coatings. This increase in brightness is especially critical when observing faint deep-sky objects like the Veil Nebula (NGC 6960) or distant galaxies where every photon counts.\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\u003eSecure Mechanical Design: 3-Inch Body with Compression Rings and a Safety Taper\u003c\/h3\u003e\n\u003cp\u003eThis diagonal is built for both stability and safety. Eyepieces are held in place by a brass compression ring on the included 2-inch adapter, which prevents the marring and scratching caused by simple set screws. The 3-inch insert barrel features a double taper, a crucial safety feature that prevents the diagonal from slipping out of the focuser if the locking screw becomes loose.\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\u003e3-Inch vs. 2-Inch Diagonals: Why the Larger Format Matters\u003c\/h3\u003e\n\u003cp\u003eWhile a 2-inch diagonal is sufficient for most visual astronomy, a 3-inch model is essential for preventing vignetting in specific applications. Large \u003ca href=\"\/collections\/refractors\"\u003erefractor\u003c\/a\u003e telescopes and \u003ca href=\"\/collections\/astrograph-telescopes\"\u003eastrographs\u003c\/a\u003e with 3-inch or larger focusers can illuminate a very wide field, and a 3-inch diagonal ensures that the light cone is not cut off before it reaches a full-frame imaging sensor or an extreme wide-field 2-inch eyepiece.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor Imagers:\u003c\/strong\u003e If you are using a large-format CMOS or CCD camera, a 3-inch diagonal provides a larger clear aperture to fully illuminate the sensor and avoid darkened corners in your images.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor Visual Observers:\u003c\/strong\u003e While not always necessary, it provides peace of mind that your widest 2-inch eyepieces are operating without any restriction from the diagonal itself.\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 Explore Scientific 3-inch Diagonal's 99% reflectivity?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e99% reflectivity\u003c\/strong\u003e from its dielectric coating ensures maximum light transmission from your telescope to your eyepiece. This results in brighter images, which is especially important for viewing faint deep-sky objects like nebulae and galaxies, compared to standard diagonals which may only reflect 90-96% of the light.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Explore Scientific 3-inch Diagonal fit my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis diagonal is designed specifically for telescopes equipped with a \u003cstrong\u003e3-inch focuser\u003c\/strong\u003e. It will not fit standard 1.25-inch or 2-inch focusers. It is most commonly used with large \u003ca href=\"\/collections\/apochromatic-refractors\"\u003eapochromatic refractors\u003c\/a\u003e and \u003ca href=\"\/collections\/ritchey-chretien-and-dall-kirkham\"\u003eRitchey-Chrétien\u003c\/a\u003e telescopes designed for wide-field imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy would I need a 3-inch diagonal instead of a 2-inch for my large refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor a large refractor with a 3-inch or larger focuser, a 3-inch diagonal is critical for preventing \u003cstrong\u003evignetting\u003c\/strong\u003e (darkening at the edges of the field of view). This is most apparent when using full-frame imaging sensors or very long focal length, wide-field 2-inch eyepieces that utilize the entire light cone produced by the telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Explore Scientific 3-inch diagonal prevent damaging my eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe included 2-inch adapter uses a \u003cstrong\u003ebrass compression ring\u003c\/strong\u003e to secure eyepieces. When you tighten the lock screw, the ring gently and evenly tightens around the eyepiece barrel. This provides a more secure grip than a single set screw and prevents the screw from digging into and scratching the barrel of your expensive eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI'm imaging the Andromeda Galaxy (M31) with a full-frame sensor; will this 3-inch diagonal help?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Imaging a large target like the Andromeda Galaxy (M31) with a full-frame sensor is exactly the scenario where a 3-inch diagonal is most beneficial. It ensures the entire sensor is evenly illuminated by your telescope's light cone, preventing the vignetting that a smaller 2-inch diagonal would likely cause at the corners of your image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Explore Scientific 3-inch diagonal include an adapter for 1.25\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this diagonal comes standard with a \u003cstrong\u003e2-inch adapter only\u003c\/strong\u003e. A separate 2-inch to 1.25-inch adapter would be required to use 1.25-inch eyepieces, though this is not a typical use case for a diagonal of this size.\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\u003e812257014774\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e3-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflectivity\u003c\/td\u003e\n\u003ctd\u003e99% Dielectric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Adapter\u003c\/td\u003e\n\u003ctd\u003e2-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e900 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope-Side Connection\u003c\/td\u003e\n\u003ctd\u003e3\" barrel\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\"\u003e3in dielectric diagonal\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\"\u003e2in eyepiece adapter\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 covers\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\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":44967198916893,"sku":"ES-DD03-01CF","price":825.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-99-Reflective-3-inch-Diagonal-DD03-01CF-1__40342.1594240339.1280.1280.jpg?v=1684338701"},{"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\" \u003ca href=\"\/collections\/refractors\"\u003erefractor\u003c\/a\u003e 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 \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e. 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\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e12.6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e6 in 4 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e115 g\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\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 \u003ca href=\"\/collections\/focusers\"\u003efocusers\u003c\/a\u003e 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 \u003ca href=\"\/collections\/schmidt-cassegrain-telescopes\"\u003eSchmidt-Cassegrain\u003c\/a\u003e 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\u003eThey are 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\u003e10.4mm\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\u003ctr\u003e\n\u003ctd\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e14.7mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e5 in 3 groups\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\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Limited USA Lifetime Warranty\u003c\/a\u003e\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\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\" \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e.\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 \u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e 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\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\u003c\/td\u003e\n\u003ctd\u003e62°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e14.8mm\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\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e20.9mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e5 in 3 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e142 g\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\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":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\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 \u003ca href=\"\/collections\/schmidt-cassegrain-telescopes\"\u003eSchmidt-Cassegrain Telescope\u003c\/a\u003e 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 \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e 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 \u003ca href=\"\/collections\/neutral-density-and-polarizing-filters\"\u003emoon filters\u003c\/a\u003e.\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\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e12.9mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e6 in 4 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e110 g\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\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":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 \u003ca href=\"\/collections\/dobsonians\"\u003eDobsonian\u003c\/a\u003e (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 \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e, 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\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e19.3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e27.3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e5 in 3 groups\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° 26mm 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\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":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\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 \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e 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\u003ctr\u003e\n\u003ctd\u003eFocal length\u003c\/td\u003e\n\u003ctd\u003e32mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent field\u003c\/td\u003e\n\u003ctd\u003e62°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e22.2mm\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\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e33.6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e5 in 3 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e420 g\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\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":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\" Diameter Barrel\u003c\/li\u003e\n\u003cli\u003e21.6mm Eye Relief\u003c\/li\u003e\n\u003cli\u003eWaterproof, 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 with an expansive 82° apparent field of view in a standard 1.25\" barrel. It has 7 elements in 4 groups, 21.6mm of eye relief and an O-ring sealed, argon-purged waterproof body, and weighs 279 g.\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 Explore Scientific 82° 11mm Eyepiece: An Immersive 279g Optic\u003c\/h3\u003e\n\u003cp\u003eThe 11mm is a popular focal length in the upper-medium power class, for any application where more power is desired: globular star clusters, planetary nebulae, the bright cloud structure near the nucleus of comets, and initial observations of planets.\u003c\/p\u003e\n\u003cp\u003eExplore Scientific assembles each eyepiece into precision machined metal lens barrels that maintain the alignment of the optical train for years of rugged use in 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 82° Apparent Field: A Spacewalk Experience\u003c\/h3\u003e\n\u003cp\u003eThe defining feature of this eyepiece is its 82° apparent field of view. This ultra-wide perspective creates a \"spacewalk\" effect, where the edge of the field is so far from the center that it effectively disappears from your awareness. The view feels less like looking *through* an instrument and more like being immersed in the scene itself.\u003c\/p\u003e\n\u003cp\u003eThis immersive quality naturally promotes relaxation at the eyepiece, allowing you to observe for longer periods without eye strain. Explore Scientific adds that a wide field makes it easy to use averted vision, looking slightly to the side of a faint object so its light falls on a more sensitive part 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\u003e21.6mm Eye Relief: Uncompromised Comfort for All Observers\u003c\/h3\u003e\n\u003cp\u003eThe 11mm has 21.6mm of eye relief, the distance from the eye lens to where your eye sees the full field. A longer distance means you don't have to press your eye right up against the lens, reducing fatigue and making the experience more comfortable.\u003c\/p\u003e\n\u003cp\u003eLong eye relief helps observers who keep their glasses on, for example to correct astigmatism. Whether you see the whole field with glasses depends on your glasses and eye position.\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\u003eOptical Design: 7 Elements and EMD Coatings for a High-Contrast Field\u003c\/h3\u003e\n\u003cp\u003eThe 11mm uses 7 lens elements in 4 groups. Advanced computer design and combinations of low dispersion and high refractive index glasses optimize the 82° Series for high contrast, high resolution and superior flat field characteristics.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Multilayer Deposition (EMD) Coatings:\u003c\/strong\u003e The EMD coatings are durable and the optics fully multi-coated.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlackened Lens Edges:\u003c\/strong\u003e The lens edges are blackened to minimize the scattering of light within the lenses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat Black Interior:\u003c\/strong\u003e All internal surfaces of the barrel are flat black to keep internal reflections to a minimum.\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\u003eBuilt for the Field: 100% Waterproof, Argon-Purged Construction\u003c\/h3\u003e\n\u003cp\u003eEach 82° Series eyepiece is O-ring sealed and purged with an inert gas (argon) to create a waterproof environment, with a waterproof, fog-proof housing.\u003c\/p\u003e\n\u003cp\u003eSealing keeps moisture out of the inside of the eyepiece, so the internal surfaces do not fog. Dew can still form on the outer 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\u003eThe 1.25\" Barrel: Secure Fit and Universal Compatibility\u003c\/h3\u003e\n\u003cp\u003eThe Explore Scientific 82° 11mm eyepiece features a standard 1.25\" barrel, which fits 1.25\" \u003ca href=\"\/collections\/focusers\"\u003efocusers\u003c\/a\u003e, \u003ca href=\"\/collections\/diagonals\"\u003ediagonals\u003c\/a\u003e and \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eBarlow lenses\u003c\/a\u003e. The body is 87mm long and 48mm wide.\u003c\/p\u003e\n\u003cp\u003eAt 279 g, it is more substantial than a simple Plössl; depending on your setup, you may need to make a small adjustment to your telescope's balance when switching from a much lighter 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\u003eThe 15.9mm Field Stop: Calculating Your True Field of View\u003c\/h3\u003e\n\u003cp\u003eThe field stop is the physical ring inside the eyepiece that defines the edge of the field of view. In the 11mm 82° eyepiece, this stop has a diameter of 15.9mm. This dimension, combined with your telescope's focal length, lets you work out the true field of view (TFoV), the actual patch of sky you will see.\u003c\/p\u003e\n\u003cp\u003eTo calculate the TFoV in degrees, use the following formula:\u003cbr\u003e\u003cem\u003eTFoV ≈ (Field Stop Diameter \/ Telescope Focal Length) × 57.3\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eFor example, on a telescope with a 1200mm focal length, the true field of view with this eyepiece would be approximately (15.9 \/ 1200) × 57.3 ≈ 0.76 degrees. That frames the full Moon, about 0.5 degrees across, with room around it.\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: Calculating Magnification for Your Telescope\u003c\/h3\u003e\n\u003cp\u003eMagnification is determined by the ratio of your telescope's focal length to your eyepiece's focal length. With its 11mm focal length, this eyepiece will produce medium-high power on most telescopes, perfect for detailed observations.\u003c\/p\u003e\n\u003cp\u003eTo calculate the magnification, use this simple formula:\u003cbr\u003e\u003cem\u003eMagnification = Telescope Focal Length \/ 11mm\u003c\/em\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith a 750mm focal length refractor:\u003c\/strong\u003e 750mm \/ 11mm = 68x magnification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith a 1200mm focal length Dobsonian:\u003c\/strong\u003e 1200mm \/ 11mm = 109x magnification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith a 2000mm focal length telescope:\u003c\/strong\u003e 2000mm \/ 11mm = 182x magnification.\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\u003eIdeal Targets for an 11mm, 82° Eyepiece\u003c\/h3\u003e\n\u003cp\u003eThe combination of medium-high power and a wide field makes the 11mm focal length extremely versatile. It has enough power for detail and a wide enough field to keep objects in view longer on non-driven mounts. Suggested targets include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlobular Star Clusters:\u003c\/strong\u003e Bright globulars such as the Hercules Cluster (M13) and M92 begin to resolve at this power in a medium or large telescope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary Nebulae:\u003c\/strong\u003e Compact objects such as the Ring Nebula (M57) and the Dumbbell Nebula (M27) gain image scale.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBright Comet Nuclei:\u003c\/strong\u003e The bright cloud structure near the nucleus of comets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanets:\u003c\/strong\u003e Initial observations of planets, such as Jupiter's cloud bands and moons or the rings of Saturn.\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\u003eExpanding Magnification with 2x, 3x, \u0026amp; 5x Focal Extenders\u003c\/h3\u003e\n\u003cp\u003eExplore Scientific's Focal Extenders give 2X, 3X or 5X magnification increases while maintaining the eyepiece's native apparent field and eye relief. The 1.25\" models are the FE02-125, FE03-125 and FE05-125.\u003c\/p\u003e\n\u003cp\u003eAdding a focal extender effectively multiplies your eyepiece collection. For example, pairing this 11mm eyepiece with a 2x Focal Extender gives you the equivalent of a 5.5mm eyepiece, doubling your magnification while keeping the eye relief.\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\u003eCare and Storage\u003c\/h3\u003e\n\u003cp\u003eAs a precision optical instrument, the Explore Scientific 82° 11mm eyepiece should be handled with care. Keep it capped and stored when not in use. The sealed body keeps moisture out of the interior, but the outer lens surfaces still need care.\u003c\/p\u003e\n\u003cp\u003eIf the outer lenses require cleaning, first remove any loose dust with a blower bulb. Then, use a lens-safe cleaning fluid and a microfiber cloth to gently wipe the surface. Store the eyepiece in a protective case when not in 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\u003e82° Immersion vs. 52° Porthole: The Wide-Field Advantage\u003c\/h3\u003e\n\u003cp\u003eCompared to a traditional Plössl eyepiece with a 50°-52° apparent field, the 82° field of this eyepiece offers a fundamentally different observing experience. A standard eyepiece presents a sharp but constrained \"porthole\" view, where the edge of the field is always apparent. You are always aware you are looking through an instrument.\u003c\/p\u003e\n\u003cp\u003eThe 82° design removes this boundary. The view is so expansive that an object can drift for a significant time before exiting the field, requiring fewer adjustments at the telescope. This is particularly beneficial for observers using \u003ca href=\"\/collections\/dobsonians\"\u003eDobsonian\u003c\/a\u003e or other non-motorized mounts. \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\u003eEach eyepiece is O-ring sealed and purged with an inert gas (\u003cstrong\u003eargon\u003c\/strong\u003e) to create a waterproof environment. That keeps moisture out of the interior, so the inside does not fog.\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\u003eA wide field makes it easy to use \u003cstrong\u003eaverted vision\u003c\/strong\u003e. This technique, where you look slightly to the side of an object, places its light on the more sensitive peripheral parts of your retina, making faint details more apparent.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat power does the 11mm give in a 2000mm telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a 2000mm focal length telescope the 11mm gives about 182x, with a true field of about 0.46 degrees (15.9 \/ 2000 x 57.3). That suits:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlobular Clusters:\u003c\/strong\u003e M13, M92 and M15.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary Nebulae:\u003c\/strong\u003e the Ring Nebula (M57).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGalaxies:\u003c\/strong\u003e the bright cores 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. At \u003cstrong\u003e279 g\u003c\/strong\u003e, the Explore Scientific 82° 11mm eyepiece is heavier than many simple eyepieces. If you are switching from a much lighter 1.25\" eyepiece, you may need to adjust your telescope's \u003ca href=\"\/collections\/counterweights\"\u003ecounterweights\u003c\/a\u003e or optical tube position 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. Explore Scientific's own \u003cstrong\u003eFocal Extenders\u003c\/strong\u003e give 2X, 3X or 5X magnification increases while maintaining the eyepiece's native apparent field and eye relief.\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 is a good choice for initial observations of planets. Power depends on your telescope: 109x at 1200mm, for example. On a steady night Jupiter's main cloud bands and a moon's shadow during a transit can show in a medium or large telescope. 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\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 21.6mm eye relief on the Explore Scientific 11mm eyepiece suitable for eyeglass wearers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e21.6mm eye relief\u003c\/strong\u003e is generous, which helps if you observe with glasses on. Whether you see the whole field depends on your glasses and eye position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I calculate the true field of view for the Explore Scientific 11mm eyepiece on my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou can calculate the approximate true field of view (TFoV) using the eyepiece's \u003cstrong\u003e15.9mm field stop\u003c\/strong\u003e and your telescope's focal length. The formula is: TFoV in degrees ≈ (15.9 \/ Telescope Focal Length in mm) × 57.3. This gives a close approximation of the patch of sky you see.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the practical benefits of the argon-purged design in the field?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe housing is waterproof and fog-proof. Sealing keeps moisture out of the interior, so the internal surfaces do not fog; dew on the outer lens is still possible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the Explore Scientific 11mm 82° eyepiece weigh 279g, more than a simple Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe weight is a direct result of its advanced design. The eyepiece contains \u003cstrong\u003e7 elements in 4 groups\u003c\/strong\u003e in precision machined metal lens barrels, sealed and argon purged.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"EMD\" coating mean on the Explore Scientific 11mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eEMD stands for \u003cstrong\u003eEnhanced Multilayer Deposition\u003c\/strong\u003e. It is Explore Scientific's durable coating process; the 82° Series is fully multi-coated.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 11mm focal length a good choice for a beginner?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn 11mm eyepiece is an excellent \"next step\" after the standard 25mm eyepiece that comes with most telescopes. It provides a significant boost in magnification for viewing planets, double stars, and smaller deep-sky objects, and the wide 82° field makes objects easier to keep in 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\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e21.6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e15.9mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e7 in 4 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e279 g\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° 11mm 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\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\u003e15.6mm Eye Relief\u003c\/li\u003e\n\u003cli\u003e7 Elements in 4 Groups\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° 14mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 82° 14mm Waterproof Eyepiece delivers a medium-high power 14mm focal length and an expansive 82° apparent field in a standard 1.25-inch barrel. It has 7 elements in 4 groups, 15.6mm of eye relief and an O-ring sealed, argon-purged waterproof body, and weighs 256 g.\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 Focal Length\u003c\/h3\u003e\n\u003cp\u003eThe defining feature of this eyepiece is its 82° apparent field of view. The 82° field naturally promotes relaxation at the eyepiece, so it is easier to observe for longer and details begin to materialize that may not be apparent at first glance.\u003c\/p\u003e\n\u003cp\u003eThis immersive effect is more than just an aesthetic improvement; it's a practical tool for observation. Explore Scientific adds that a wide field makes it easy to use averted vision, looking slightly to the side of a faint object so its light falls on a more sensitive part 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\u003e15.6mm Eye Relief for Viewing Comfort\u003c\/h3\u003e\n\u003cp\u003eComfort is critical for serious observing, and the Explore Scientific 14mm eyepiece provides a generous 15.6mm of eye relief. This is the distance your eye must be from the top lens to see the entire 82° field of view. Whether you can see the whole field with glasses on depends on your glasses and eye position.\u003c\/p\u003e\n\u003cp\u003eThe 82° Series combines a super-wide apparent field with generous eye relief.\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 7-Element Design with EMD Coatings\u003c\/h3\u003e\n\u003cp\u003eThe 14mm uses 7 lens elements in 4 groups. Advanced computer design and combinations of low dispersion and high refractive index glasses optimize the 82° Series for high contrast, high resolution and superior flat field characteristics.\u003c\/p\u003e\n\u003cp\u003eIt has durable EMD coatings and fully multi-coated optics.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat Black Interior:\u003c\/strong\u003e All internal surfaces of the barrel are flat black to keep internal reflections to a minimum.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced Scatter:\u003c\/strong\u003e The lens edges are blackened to minimize scattering within the lenses.\u003c\/li\u003e\n\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 All-Weather Reliability\u003c\/h3\u003e\n\u003cp\u003eEach 82° Series eyepiece is O-ring sealed and purged with an inert gas (argon) to create a waterproof environment.\u003c\/p\u003e\n\u003cp\u003eSealing keeps moisture out of the interior, so the internal surfaces do not fog; dew can still form on the outer 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\u003eThe Standard 1.25-Inch Barrel and Physical Build\u003c\/h3\u003e\n\u003cp\u003eThe Explore Scientific 82° 14mm eyepiece features a standard 1.25-inch barrel, for 1.25-inch \u003ca href=\"\/collections\/focusers\"\u003efocusers\u003c\/a\u003e and \u003ca href=\"\/collections\/diagonals\"\u003ediagonals\u003c\/a\u003e. Explore Scientific assembles each eyepiece into precision machined metal lens barrels that maintain the alignment of the optical train for years of rugged use in the field. The body is 83mm long and 48mm wide.\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eLightweight Design:\u003c\/strong\u003e It weighs 256 g.\u003c\/li\u003e\n\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 18.9mm Field Stop and True Field of View\u003c\/h3\u003e\n\u003cp\u003eThe field stop is the physical aperture inside the eyepiece that defines the edge of the field of view. In the 14mm 82° eyepiece, the field stop is 18.9mm across. The size of the field stop, combined with your telescope's focal length, determines the true field of view (TFOV), the actual patch of sky you see.\u003c\/p\u003e\n\u003cp\u003eYou can calculate the TFOV in degrees using this formula: (Field Stop Diameter \/ Telescope Focal Length) * 57.3. For example, in a telescope with a 1200mm focal length, this eyepiece would yield a TFOV of (18.9mm \/ 1200mm) * 57.3 ≈ 0.9 degrees. That frames the Dumbbell Nebula (M27) or the Hercules Cluster (M13) with room around them.\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\u003eCalculating Power with the 14mm Eyepiece\u003c\/h3\u003e\n\u003cp\u003eThe 14mm focal length of this eyepiece provides medium-to-high magnification, making it a versatile workhorse for a wide range of celestial targets. To find the magnification it will produce with your telescope, simply divide your telescope's focal length by the eyepiece's focal length (14mm).\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith a short focal length refractor (e.g., 600mm):\u003c\/strong\u003e Magnification = 600mm \/ 14mm ≈ 43x. A wide view for open clusters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith a mid-sized Dobsonian (e.g., 1200mm):\u003c\/strong\u003e Magnification = 1200mm \/ 14mm ≈ 86x. A general-purpose deep-sky power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith a 2000mm telescope:\u003c\/strong\u003e Magnification = 2000mm \/ 14mm ≈ 143x, for globular clusters, planetary nebulae and the planets.\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\u003eIdeal Targets for Medium-High Magnification\u003c\/h3\u003e\n\u003cp\u003eThis power class suits globular clusters, planetary nebulae, the bright cloud structure near comet nuclei and initial observations of planets:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlobular Star Clusters:\u003c\/strong\u003e At magnifications over 100x, bright globulars such as the Hercules Cluster (M13) and M5 begin to resolve in a medium or large telescope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary Nebulae:\u003c\/strong\u003e The Ring Nebula (M57) shows its ring shape and the Dumbbell Nebula (M27) its two lobes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBright Galaxies:\u003c\/strong\u003e Smaller galaxies such as the Whirlpool Galaxy (M51) and Bode's Galaxy (M81) fit with room around them.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Moon and Planets:\u003c\/strong\u003e Jupiter's cloud bands and Galilean moons, the rings of Saturn, and the larger craters and mountain ranges on the Moon.\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\u003eExtending Magnification with Explore Scientific Focal Extenders\u003c\/h3\u003e\n\u003cp\u003eYou can increase the versatility of the 14mm eyepiece by pairing it with an Explore Scientific \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eFocal Extender\u003c\/a\u003e. These Focal Extenders give 2X, 3X or 5X magnification increases while maintaining the eyepiece's native apparent field and eye relief.\u003c\/p\u003e\n\u003cp\u003eThe 1.25\" models are the FE02-125, FE03-125 and FE05-125. Adding one to your collection effectively multiplies the number of magnifications at your disposal:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith a 2x Focal Extender:\u003c\/strong\u003e The 14mm eyepiece performs like a 7mm eyepiece, doubling the magnification for planetary viewing or splitting tight double stars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith a 3x Focal Extender:\u003c\/strong\u003e It performs like a 4.7mm eyepiece, providing very high power for nights of excellent seeing.\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 \u003cstrong\u003e82° apparent field\u003c\/strong\u003e naturally promotes relaxation at the eyepiece, makes it easier to observe for longer, and makes averted vision easy to use on faint objects.\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\u003eThe eyepiece is O-ring sealed and purged with an inert gas (\u003cstrong\u003eargon\u003c\/strong\u003e) to create a waterproof environment, with a fog-proof housing. Moisture stays out of the interior; dew can still form on the outer lens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the 14mm show in a 2000mm telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a 2000mm focal length telescope the 14mm gives about 143x with a true field of about 0.54 degrees (18.9 \/ 2000 x 57.3). That suits:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBright globular clusters like the \u003cstrong\u003eHercules Cluster (M13)\u003c\/strong\u003e or \u003cstrong\u003eM5\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003ePlanetary nebulae like the \u003cstrong\u003eRing Nebula (M57)\u003c\/strong\u003e or the \u003cstrong\u003eDumbbell Nebula (M27)\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eObserving details in the cloud bands of \u003cstrong\u003eJupiter\u003c\/strong\u003e and the rings of \u003cstrong\u003eSaturn\u003c\/strong\u003e on nights of steady seeing.\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 15.6mm eye relief on the Explore Scientific 14mm eyepiece enough for eyeglass wearers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt depends on your glasses. The 82° Series has generous eye relief; at \u003cstrong\u003e15.6mm\u003c\/strong\u003e many glasses wearers see most of the field, but the result depends on the glasses and eye position.\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\u003e\u003cstrong\u003eEMD (Enhanced Multilayer Deposition)\u003c\/strong\u003e is Explore Scientific's durable coating process. Together with fully multi-coated, edge-blackened optics, it produces maximum contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I calculate the true field of view for the Explore Scientific 14mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe true field of view (TFOV) depends on the eyepiece's field stop and your telescope's focal length. This eyepiece has a \u003cstrong\u003efield stop of 18.9mm\u003c\/strong\u003e. To calculate the TFOV in degrees, use the formula: (18.9 \/ Your Telescope's Focal Length in mm) * 57.3. For a telescope with a 1000mm focal length, the TFOV would be approximately 1.08 degrees.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of using an Explore Scientific Focal Extender with this 14mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eExplore Scientific Focal Extenders increase magnification while maintaining the eyepiece's native apparent field and eye relief. When you use a 2x focal extender with this 14mm eyepiece, you get the magnification of a 7mm eyepiece but maintain the comfortable \u003cstrong\u003e15.6mm eye relief\u003c\/strong\u003e and immersive \u003cstrong\u003e82° apparent field\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow should I clean the lenses on my Explore Scientific 14mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFirst, use a blower bulb to remove any loose dust or particles. Never wipe the lens before doing this, as grit can scratch the coatings. For fingerprints or smudges, apply a few drops of a quality optical \u003ca href=\"\/collections\/cleaning-supplies\"\u003ecleaning solution\u003c\/a\u003e to a microfiber cloth (not directly to the lens) and gently wipe in a circular motion from the center outwards. Use a clean part of the cloth for a final, gentle wipe.\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\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e15.6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e18.9mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e7 in 4 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e256 g\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° 14mm 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\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\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° 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 prevents internal fogging. 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\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 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 \"\u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e\" 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 \u003ca href=\"\/collections\/dobsonians\"\u003eDobsonian\u003c\/a\u003e, 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 \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e 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\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    \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\u003c\/td\u003e\n\u003ctd\u003e62°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e28.2mm\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\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e42.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e5 in 3 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e669 g\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° 40mm 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\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":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\u003cli\u003eWeighs 275 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\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 Waterproof Eyepiece combines a high-power 4.5mm focal length with a vast 82° apparent field of view for immersive planetary and double-star observation. It has 7 elements in 5 groups and 15.9mm of eye relief, which puts the focus on a comfortable viewing experience for all observers. The 1.25\" argon-purged waterproof body weighs 275 g and measures 106mm by 50mm.\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 Immersive 82° Field at a High-Power 4.5mm Focal Length\u003c\/h3\u003e\n\u003cp\u003eThe 82° field naturally promotes relaxation at the eyepiece, makes it easier to observe for longer, and promotes the use of averted vision, looking slightly to the side of a faint object so its light falls on a more sensitive part of your eye. The 4.5mm is perfect for objects that benefit from high magnification, such as the Moon, the planets and binary stars, and for detailed examination of structure within nebulae, when the air is steady.\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\u003e15.9mm of Long Eye Relief for Viewing Comfort\u003c\/h3\u003e\n\u003cp\u003eHigh-magnification observing requires steady, comfortable eye placement. This eyepiece is designed with 15.9mm of eye relief, a feature that defines it as a Long Eye Relief (LER) model. Long eye relief is especially important for eyeglass wearers because it allows them to enjoy the full field of 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\u003e7-Element\/5-Group Optics with EMD Coatings\u003c\/h3\u003e\n\u003cp\u003eThe 4.5mm LER uses 7 elements in 5 groups. The edge-blackened optics are made of low-dispersion glass with a high refractive index, and each lens is fully multi-coated with durable EMD coatings, for sharp contrast, high resolution and crisp definition.\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 275g Body\u003c\/h3\u003e\n\u003cp\u003eExplore Scientific's waterproof eyepieces are gas-purged and O-ring sealed to create a waterproof environment that is impervious to internal fogging and keeps contaminants out of the housing, which makes cleaning easy. The 1.25\" barrel fits standard focusers and \u003ca href=\"\/collections\/diagonals\"\u003ediagonals\u003c\/a\u003e, and the eyepiece weighs 275 g.\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 4.5mm LER vs. Longer Focal Lengths: High-Power Applications\u003c\/h3\u003e\n\u003cp\u003eThe 4.5mm focal length places this eyepiece firmly in the high-magnification category. It suits close double stars such as the Double-Double (Epsilon Lyrae) and planetary detail. The trade-off for this power is a smaller true field of view compared to a longer focal length eyepiece from the same 82° series. Longer focal lengths in the series suit large objects; the 4.5mm is for small targets. It is also more sensitive to atmospheric turbulence and demands steady skies to deliver its best performance.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal Extender Compatibility:\u003c\/strong\u003e You can increase the magnification further by pairing this eyepiece with an optional 1.25\" \u003ca href=\"\/collections\/barlows-and-extenders\"\u003efocal extender\u003c\/a\u003e. A 2x extender would make it act like a 2.25mm eyepiece, which is beyond the useful magnification of most telescopes, so a 2x extender suits longer focal lengths better.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Power Targets:\u003c\/strong\u003e Lunar craters and rilles, Jupiter's belts, Saturn's rings and small planetary nebulae such as the Ring Nebula (M57), in steady air.\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 15.9mm eye relief on the Explore Scientific 4.5mm LER help eyeglass wearers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eLong eye relief is especially important for eyeglass wearers because it allows them to enjoy the full field of view. The 4.5mm LER has \u003cstrong\u003e15.9mm\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat magnification does the 4.5mm LER give?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eDivide your telescope's focal length by 4.5: 480mm gives about 107x, 714mm about 159x and 1200mm about 267x. A common rule of thumb puts the useful limit near 2x the aperture in millimeters, so in long focal length telescopes this eyepiece can exceed what the aperture and air support.\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 argon-purged design in the Explore Scientific 4.5mm LER?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe gas-purged, O-ring sealed housing is waterproof, impervious to internal fogging and keeps contaminants out, which makes cleaning easy.\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 4.5mm LER help with \"averted vision\"?\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 use the more light-sensitive peripheral cells in your retina. The broad 82° field promotes its use.\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\u003eFor small, bright ones. It suits detailed examination of structure within nebulae. Use the 4.5mm eyepiece to:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSplit the core stars in the Trapezium within the Orion Nebula (M42).\u003c\/li\u003e\n\u003cli\u003eExamine the central star and structure of planetary nebulae like the Ring Nebula (M57).\u003c\/li\u003e\n\u003cli\u003eLook into the cores of bright globular clusters such as the Hercules Cluster (M13).\u003c\/li\u003e\n\u003c\/ul\u003e\n\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\u003eEach lens is fully multi-coated with durable \u003cstrong\u003eenhanced multi-layer deposition (EMD)\u003c\/strong\u003e coatings, which with the edge-blackened optics give superior light transmission.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use a focal extender with the 4.5mm LER?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Explore Scientific's 1.25\" Focal Extenders (FE02-125, FE03-125, FE05-125) increase magnification while maintaining the eyepiece's apparent field and eye relief, though with a 4.5mm eyepiece the result is very high power.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow large is the 4.5mm LER?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is 106mm long and 50mm wide and weighs 275 g, with a 1.25\" barrel.\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\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e7 in 5 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e275 g\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° 4.5mm LER 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\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\u003e7 Elements in 5 Groups\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 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 through its powerful 6.5mm focal length and an immersive 82° apparent field. Its 16.8mm of eye relief puts the focus on comfort; long relief is a must for eyeglass wearers because it lets them enjoy the full field of view. It has 7 elements in 5 groups in a sealed, argon-purged 1.25\" body weighing 325 g.\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\u003e6.5mm Focal Length: High-Power Planetary and Double Star Views\u003c\/h3\u003e\n\u003cp\u003eWith a 6.5mm focal length, this eyepiece is a specialist for high-power observation. It produces high magnifications that are great for the Moon, the planets and binary stars. In a 1200mm telescope it gives about 185x, and in a 714mm telescope about 110x.\u003c\/p\u003e\n\u003cp\u003eThe trade-off for this high magnification is a greater sensitivity to atmospheric seeing. When the air is almost perfect, it can reveal amazing planetary detail and allow thorough exploration of structure within 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 82° Apparent Field: An Immersive Spacewalk Experience\u003c\/h3\u003e\n\u003cp\u003eThe 82° field immerses you and naturally promotes relaxation at the eyepiece, so it is easier to observe for longer and details begin to materialize that were not revealed at first glance.\u003c\/p\u003e\n\u003cp\u003eThe broad field also promotes averted vision, looking slightly to the side of a faint object so its light falls on a more sensitive part 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\u003e16.8mm Long Eye Relief: Viewing the Full Field with Glasses\u003c\/h3\u003e\n\u003cp\u003eA standout feature of this eyepiece is its generous 16.8mm of eye relief. Long relief is a must for eyeglass wearers because it allows them to enjoy the full field of view.\u003c\/p\u003e\n\u003cp\u003e\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\u003e7-Element\/5-Group System with EMD Coatings\u003c\/h3\u003e\n\u003cp\u003eTo deliver a sharp, high-contrast image across the wide 82° field, this eyepiece uses a complex optical design of 7 lens elements arranged in 5 groups. \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvanced Glass and Coatings:\u003c\/strong\u003e The lenses are made from low-dispersion glass with a high refractive index and are fully multi-coated with Explore Scientific's proprietary Enhanced Multi-Layer Deposition (EMD) coatings. This achieves superior light transmission.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEdge-Blackened Optics:\u003c\/strong\u003e For sharp contrast, high resolution and crisp definition.\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 and Waterproof\u003c\/h3\u003e\n\u003cp\u003eExplore Scientific's waterproof eyepieces are gas-purged and O-ring sealed to create a waterproof environment that is impervious to internal fogging and keeps contaminants out of the housing.\u003c\/p\u003e\n\u003cp\u003eExplore Scientific adds that this makes cleaning the eyepiece easy, since only the outer lens surfaces need attention.\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\u003e6.5mm LER vs. 4.5mm LER: Choosing Your Magnification Sweet Spot\u003c\/h3\u003e\n\u003cp\u003eWithin the Explore Scientific 82° LER series, selecting the right high-power eyepiece depends on your telescope and typical seeing conditions. \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific 6.5mm LER:\u003c\/strong\u003e Lower power than the 4.5mm, so it is usable on more nights.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific 4.5mm LER:\u003c\/strong\u003e Higher magnification (15.9mm eye relief), which needs steadier air.\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 magnification does the 6.5mm LER give?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eDivide your telescope's focal length by 6.5: 480mm gives about 74x, 760mm about 117x and 1200mm about 185x. Long focal length telescopes push it past 300x, which needs very steady air.\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\u003eExplore Scientific designed the 6.5mm LER with \u003cstrong\u003e16.8mm of eye relief\u003c\/strong\u003e for comfort and says long relief is a must for eyeglass wearers because it allows them to enjoy the full 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 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 creates a \u003cstrong\u003ewaterproof\u003c\/strong\u003e environment that is impervious to internal fogging and keeps contaminants out of the housing.\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 viewing the Orion Nebula (M42) in my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor a wide-field object like the Orion Nebula (M42), a 6.5mm eyepiece will almost always provide too much magnification to see the entire object. This focal length is designed to resolve fine detail in smaller targets. For example, at 117x in a 760mm telescope the field is about 0.7 degrees (82 \/ 117), which shows the Trapezium and the bright core but not the faint outer nebulosity. A longer focal length eyepiece suits the whole nebula.\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. The wide field promotes relaxation and the use of averted vision.\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 LER eyepiece with a focal extender?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Explore Scientific's 1.25\" \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eFocal Extenders\u003c\/a\u003e (FE02-125, FE03-125, FE05-125) fit its 1.25\" barrel. For example, using it with a 2x focal extender would effectively turn it into a 3.25mm eyepiece, doubling the magnification. This can be useful for extremely high-power applications on nights of perfect seeing, but may be too much magnification for most telescopes and conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I clean my Explore Scientific 6.5mm waterproof eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe sealed design makes cleaning easy: only the outer lens surfaces need it. First, use a blower bulb to remove any loose dust or grit. Then, if needed, apply a few drops of a quality \u003ca href=\"\/collections\/cleaning-supplies\"\u003elens cleaning solution\u003c\/a\u003e to a fresh microfiber cloth and gently wipe the lens in a circular motion from the center to the edge. Never spray cleaning fluid directly onto the lens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow large and heavy is the 6.5mm LER?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt measures 106mm long and 50mm wide and weighs 325 g, with a 1.25\" barrel and 7 elements in 5 groups.\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\u003e811803030220\u003c\/td\u003e\n\u003c\/tr\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\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\u003e16.8mm\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\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e7 in 5 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e325 g\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° 6.5mm LER 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\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\u003cli\u003e7-Element\/5-Group 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 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, built into a rugged 1.25\" barrel. It has 7 elements in 5 groups and 15mm of eye relief, which puts the focus on comfort for all observers. It weighs 280 g and is O-ring sealed and argon purged to resist 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\u003e8.5mm Focal Length and 82° Field for High-Power Immersion\u003c\/h3\u003e\n\u003cp\u003eThe 8.5mm produces high magnifications that are great for the Moon, the planets and binary stars, and when the air is almost perfect can enhance planetary detail and allow thorough exploration of structure within nebulae. The 82° field immerses you and promotes relaxation at the eyepiece.\u003c\/p\u003e\n\u003cp\u003eThe broad field also promotes averted vision: looking slightly to the side of a faint object puts its light on a more sensitive part 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\u003e15mm Long Eye Relief for Critical Viewing Comfort\u003c\/h3\u003e\n\u003cp\u003eThe 8.5mm LER has 15mm of eye relief. Long relief is a must for eyeglass wearers because it allows them to enjoy the full field of view.\u003c\/p\u003e\n\u003cp\u003eExplore Scientific adds that relaxed eyes make it easier to observe for longer, and details begin to materialize that were not revealed at first glance.\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\u003e7 Elements with Enhanced Multilayer Deposition (EMD) Coatings\u003c\/h3\u003e\n\u003cp\u003eThe eyepiece uses 7 lenses in 5 groups. The optics are made from low-dispersion glass with a high refractive index, and each lens is fully multi-coated with durable Enhanced Multilayer Deposition (EMD) coatings.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximized Contrast:\u003c\/strong\u003e The combination of advanced coatings and edge-blackened lenses minimizes internal reflections and stray light. The result is sharp contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Resolution:\u003c\/strong\u003e The optics deliver high resolution and crisp definition.\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\u003eA 1.25\" Barrel with Argon-Purged Waterproofing\u003c\/h3\u003e\n\u003cp\u003eExplore Scientific's waterproof eyepieces are gas-purged and O-ring sealed to create a waterproof environment that is impervious to internal fogging and keeps contaminants out of the housing.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFog-Proof:\u003c\/strong\u003e No internal fogging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSealed:\u003c\/strong\u003e Contaminants stay out of the housing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimplified Maintenance:\u003c\/strong\u003e The design makes cleaning easy.\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: A 32° Field Difference\u003c\/h3\u003e\n\u003cp\u003eA Plössl of similar focal length is lighter, but its field is much narrower.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eApparent Field of View:\u003c\/strong\u003e 82° versus about 50° for a typical Plössl: at the same magnification the 82° eyepiece shows about 1.6 times the width of sky.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEye Relief:\u003c\/strong\u003e Short focal length Plössls usually have short eye relief; the 8.5mm LER has 15mm.\u003c\/li\u003e\n\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. Long relief is a must for eyeglass wearers because it allows them to enjoy the full field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 82° field change planetary observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a 2000mm focal length telescope the 8.5mm gives about 235x. The planet's size is the same as in any 8.5mm eyepiece, but the 82° field shows much more sky around it. That gives the planet longer to drift across the field before you nudge a manual mount.\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 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. At high power the four main Trapezium stars are easy, and the bright nebulosity around them shows structure.\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\u003eThe eyepiece is gas-purged and O-ring sealed:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIt will not fog up internally when moving from a warm house to a cold observing site.\u003c\/li\u003e\n\u003cli\u003eContaminants are kept out of the housing.\u003c\/li\u003e\n\u003cli\u003eThe sealed design simplifies cleaning the exterior lens surfaces.\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 an Explore Scientific Focal Extender with this 8.5mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt depends on your telescope and atmospheric conditions. The 8.5mm eyepiece already provides high magnification on its own. In long focal length telescopes it is already high power; a 2x \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eFocal Extender\u003c\/a\u003e (FE02-125) suits short focal length telescopes or very steady nights. Explore Scientific's extenders keep the eyepiece's apparent field and eye relief.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 280g weight of the ES 8.5mm LER eyepiece affect balancing a telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt 280 g it is heavier than a small Plössl, so on a small, finely balanced telescope you may need to rebalance when switching eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow large is the 8.5mm LER?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eSize is 106mm long by 50mm wide, and it weighs 280 g, with a 1.25\" barrel and 7 elements in 5 groups.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat magnification does the 8.5mm give?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eDivide the telescope focal length by 8.5: about 47x at 400mm, 71x at 600mm, 141x at 1200mm and 235x at 2000mm.\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\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e7 in 5 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e280 g\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\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\u003e7 Elements in 4 Groups\u003c\/li\u003e\n\u003cli\u003e25.3mm Field Stop\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° 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 \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e, combining a vast 82° apparent field with a versatile 18mm focal length. It has 7 elements in 4 groups in an O-ring sealed, argon-purged body weighing 390 g, and a 25.3mm field stop.\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 in an 82° Field: For Clusters and Nebulae\u003c\/h3\u003e\n\u003cp\u003eWith its 18mm focal length, this eyepiece sits in the upper-medium magnification class and suits globular star clusters, planetary nebulae, the bright cloud structure near the nucleus of comets and initial observations of planets.\u003c\/p\u003e\n\u003cp\u003eThe 82° apparent field shows these objects with plenty of surrounding sky. The effect of the long eye relief and 82° field is a full-immersion 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\u003eA 7-Element Design with Enhanced Multilayer Deposition (EMD) Coatings\u003c\/h3\u003e\n\u003cp\u003eThe optical system is a computer-designed layout featuring 7 lens elements arranged in 4 groups. This configuration uses combinations of low-dispersion and high-refractive-index optical glasses which are optimized for high contrast, high resolution and flat field characteristics.\u003c\/p\u003e\n\u003cp\u003eThe lenses carry durable Enhanced Multilayer Deposition (EMD) coatings. To further boost contrast, all internal surfaces of the eyepiece barrel are blackened, and the edges of the lenses are darkened to prevent stray light from scattering and reducing image definition.\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 and Averted Vision\u003c\/h3\u003e\n\u003cp\u003eThe ultra-wide 82° apparent field of view creates a comfortable, engaging window on the universe that naturally promotes relaxation at the eyepiece. With a relaxed eye, you can observe for longer periods without fatigue, allowing faint details to materialize that might otherwise be missed. The 18mm has generous eye relief.\u003c\/p\u003e\n\u003cp\u003eThe wide field also makes it easy to use averted vision: looking slightly to the side of a faint object puts its light on a part of your eye that is more sensitive to light, allowing you to see fainter 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\u003eWaterproof, Argon-Purged Housing for Field Durability at 390g\u003c\/h3\u003e\n\u003cp\u003eEach eyepiece is assembled into precision machined metal lens barrels that keep the optical train aligned for years of rugged use. It is O-ring sealed and purged with an inert gas to create a waterproof, fog-proof housing.\u003c\/p\u003e\n\u003cp\u003eA tapered 2\" barrel adds extra security. At 390 g, it may need you to rebalance the telescope when swapping with much lighter 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\u003eUsing the 25.3mm Field Stop to Calculate True Field and Magnification\u003c\/h3\u003e\n\u003cp\u003eThe eyepiece's 25.3mm field stop is the physical aperture inside the barrel that defines the edge of the field of view. You can use this value to calculate the true field of view (TFOV) this eyepiece will deliver on your specific telescope using the formula: TFOV ≈ (Field Stop Diameter \/ Telescope Focal Length) × 57.3.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnification Example:\u003c\/strong\u003e On a telescope with a 1200mm focal length, this 18mm eyepiece provides 1200mm \/ 18mm = 67x magnification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrue Field Example:\u003c\/strong\u003e On that same 1200mm telescope, the true field would be approximately (25.3mm \/ 1200mm) * 57.3 ≈ 1.2 degrees.\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\u003ePairing with Explore Scientific 2\" Focal Extenders\u003c\/h3\u003e\n\u003cp\u003eExplore Scientific Focal Extenders raise magnification while keeping the eyepiece's native apparent field and eye relief. The 2\" models are the FE02-020 (2x) and FE03-020 (3x). With a focal extender, 3 eyepieces offer 6 magnification choices.\u003c\/p\u003e\n\u003cp\u003eWith the 2x extender the 18mm gives the magnification of a 9mm eyepiece; with the 3x, that of a 6mm.\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 82° 18mm vs. A Standard 50° Plössl Eyepiece\u003c\/h3\u003e\n\u003cp\u003eA Plössl of the same focal length shows a much narrower field.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eField of View:\u003c\/strong\u003e The most significant difference is the 82° apparent field compared to a Plössl's typical 50°. This provides a much larger, more immersive window onto the sky, making it easier to frame large objects and star-hop to new targets.\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eTrade-Offs:\u003c\/strong\u003e A Plössl is generally lighter and smaller than this 390 g, 89mm by 56mm eyepiece.\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 the 18mm show of a globular cluster at 1200mm focal length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt 1200mm focal length the 18mm gives 67x and a true field of about 1.2°. Globular star clusters are among its targets; the wide field keeps the cluster framed by surrounding sky.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 18mm useful for planets?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt suits initial observations of planets. At 2000mm focal length it gives about 111x; higher power comes from shorter eyepieces or a focal extender.\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\u003eEach eyepiece is O-ring sealed and purged with an inert gas to create a waterproof environment, giving a fog-proof housing.\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 82° field of view on the Explore Scientific 18mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 82° field immerses you in a comfortable ultra-wide view that promotes relaxation at the eyepiece, makes it easier to observe for longer, and makes averted vision easy.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this 18mm eyepiece with a Focal Extender?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Explore Scientific Focal Extenders work with this eyepiece and keep its native apparent field and eye relief. The 2\" FE02-020 doubles the magnification, matching a 9mm eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 82° 18mm eyepiece heavy? Will it affect my telescope's balance?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt weighs 390 g (13.7 oz). When switching from a small 1.25\" eyepiece you may need to rebalance a lightly balanced telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the 25.3mm field stop on the Explore Scientific 18mm eyepiece tell me?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 25.3mm field stop is the diameter of the physical baffle inside the eyepiece that defines the edge of the visible field. It's the key specification for determining the true field of view on your telescope. True field is about 25.3 \/ telescope focal length × 57.3 degrees: about 2.4° at 600mm and 1.2° at 1200mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 82° 18mm 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 has \"generous eye relief.\"\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I care for the coatings on my Explore Scientific 18mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe external lens surfaces have durable Enhanced Multilayer Deposition (EMD) coatings. To clean them, first blow off any loose dust with a bulb blower. Then, if needed, use a soft camel hair brush to gently whisk away any remaining particles. The sealed design makes cleaning easy.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow large is the 18mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is 89mm long and 56mm wide and weighs 390 g, with a tapered 2\" barrel.\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\u003ctr\u003e\n\u003ctd\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e25.3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e7 in 4 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e390 g\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\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\u003e17.5mm Eye Relief\u003c\/li\u003e\n\u003cli\u003e2\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eWaterproof Argon-Purged Design\u003c\/li\u003e\n\u003cli\u003e7 Elements in 4 Groups\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° 24mm Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n      \u003cp\u003eThe Explore Scientific 82° 24mm Waterproof Eyepiece delivers an expansive, medium-power view contained within a rugged, 2-inch barrel design. It pairs an 82° apparent field with 17.5mm of eye relief, 7 elements in 4 groups, a 33.5mm field stop and an O-ring sealed, argon-purged housing.\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\u003eAn Immersive 82° Apparent Field at 24mm\u003c\/h3\u003e\n      \u003cp\u003eThe defining feature of this eyepiece is its 82° apparent field of view, which creates a vast, panoramic window onto the sky. This comfortable ultra-wide field naturally promotes relaxation at the eyepiece, and the effect is a full-immersion experience.\u003c\/p\u003e\n      \u003cp\u003eThe 24mm suits globular star clusters, planetary nebulae, the bright cloud structure near the nucleus of comets and initial observations of planets. The wide field also makes averted vision easy: looking slightly to the side of a faint object puts its light on a part of your eye that is more sensitive to light, allowing you to see fainter images.\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\u003e7-Element, 4-Group Design with EMD Coatings\u003c\/h3\u003e\n      \u003cp\u003eThe 24mm uses 7 lens elements in 4 groups. The computer design, combining low dispersion and high refractive index glasses with durable EMD coatings, is optimized for high contrast, high resolution and flat field characteristics.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eEnhanced Multilayer Deposition (EMD) Coatings:\u003c\/strong\u003e Durable EMD coatings on the lenses.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eInternal Baffling:\u003c\/strong\u003e All internal surfaces of the barrel are flat black to keep internal reflections to a minimum.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eEdge-Blackened Lenses:\u003c\/strong\u003e The lens edges are blackened to minimize scattering of light within the lenses.\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\u003e17.5mm of Eye Relief for Viewing Comfort\u003c\/h3\u003e\n      \u003cp\u003eLong observing sessions require a comfortable eyepiece, and eye relief is a critical component of that comfort. The Explore Scientific 24mm eyepiece features a generous 17.5mm of eye relief, which is the distance your eye must be from the top lens to see the entire field of view. This ample distance allows you to observe in a more relaxed posture without pressing your eye right up against the lens.\u003c\/p\u003e\n      \u003cp\u003eThe 82° Series has long eye relief; how much of the field an eyeglass wearer sees depends on the glasses.\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 for a Waterproof, Fog-Proof Seal\u003c\/h3\u003e\n      \u003cp\u003eEach eyepiece is O-ring sealed and purged with an inert gas to create a waterproof environment and a fog-proof housing.\u003c\/p\u003e\n      \u003cp\u003eThe lenses sit in precision machined metal barrels that keep the optical train aligned for years of rugged use 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\u003eThe 704g, 2-inch Barrel and 33.5mm Field Stop\u003c\/h3\u003e\n      \u003cp\u003eThe Explore Scientific 24mm eyepiece uses a 2-inch barrel format, which is essential for delivering its ultra-wide view. Its 33.5mm field stop, the opening that defines the edge of the field, is wider than a 1.25-inch barrel allows.\u003c\/p\u003e\n      \u003cp\u003eA tapered 2\" barrel adds extra security. At 704 g and 110mm by 70mm, it may need careful balancing on smaller 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\u003eUsing Explore Scientific 2\" Focal Extenders\u003c\/h3\u003e\n      \u003cp\u003eExplore Scientific Focal Extenders raise magnification while keeping the eyepiece's native apparent field and eye relief. The 2\" models are the FE02-020 (2x) and FE03-020 (3x).\u003c\/p\u003e\n      \u003cp\u003eWith the 2x the 24mm gives the magnification of a 12mm eyepiece, and with the 3x that of an 8mm.\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\u003eEach eyepiece is O-ring sealed and purged with an inert gas to create a waterproof environment, giving a fog-proof housing.\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 improve observing?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe 82° field promotes relaxation at the eyepiece, so you can observe longer and details begin to materialize, and it makes \u003cstrong\u003eaverted vision\u003c\/strong\u003e easy, which helps you see fainter images.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat magnification and field does the 24mm give at 2000mm focal length?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAt 2000mm focal length the 24mm gives about 83x and a true field of about 0.96°. It suits globular star clusters and planetary nebulae.\u003c\/p\u003e\n    \u003cul\u003e\n      \n      \n      \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\u003eIt suits initial observations of planets. For more power, pair it with the \u003cstrong\u003eFE02-020 (2x) or FE03-020 (3x) Focal Extender\u003c\/strong\u003e. This increases the magnification while preserving the eyepiece's comfortable 17.5mm eye relief and wide 82° field.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the view change with a 2x Focal Extender?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWithout an extender, the 24mm shows twice the true field. Adding a 2x Focal Extender doubles the magnification, effectively making it a 12mm eyepiece. This narrows the true field to half while the apparent field and eye relief stay the same.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the Explore Scientific 24mm eyepiece use 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 large \u003cstrong\u003e33.5mm field stop\u003c\/strong\u003e is required. This physical aperture is too large to fit inside a 1.25-inch barrel. That is why it needs a 2-inch \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 17.5mm eye relief of the ES 24mm eyepiece sufficient for eyeglass wearers?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIt has \u003cstrong\u003e17.5mm of eye relief\u003c\/strong\u003e. Explore Scientific does not state how much of the field eyeglass wearers see; that depends on the glasses.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I calculate the true field of view of the Explore Scientific 24mm 82° eyepiece in my telescope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe most accurate way to calculate the true field of view (TFOV) is to use the eyepiece's field stop diameter. The formula is: (Field Stop Diameter \/ Telescope Focal Length) * 57.3. For this eyepiece, the field stop is \u003cstrong\u003e33.5mm\u003c\/strong\u003e. In a telescope with a 2000mm focal length, the TFOV would be (33.5 \/ 2000) * 57.3 = 0.96 degrees.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 704g weight of the Explore Scientific 24mm eyepiece affect balancing a telescope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAt 704 g (about 1.55 lbs), this is a heavy eyepiece. When switching from a much lighter 1.25-inch eyepiece you may need to rebalance the telescope.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are Enhanced Multilayer Deposition (EMD) coatings?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cstrong\u003eEMD (Enhanced Multilayer Deposition)\u003c\/strong\u003e is Explore Scientific's name for its durable multilayer lens coatings, which it pairs with edge-blackened lenses and flat black internal surfaces to keep internal reflections to a minimum.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow large is the 24mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt measures 110mm long and 70mm wide and weighs 704 g, with a tapered 2\" barrel.\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\u003e812257014637\u003c\/td\u003e\n\u003c\/tr\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\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\u003e17.5mm\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\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e33.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e7 in 4 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e704 g\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° 24mm 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\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":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\u003e\n\u003cstrong\u003eFocal Length:\u003c\/strong\u003e 30mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApparent Field of View:\u003c\/strong\u003e 82°\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel Diameter:\u003c\/strong\u003e 2\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEye Relief:\u003c\/strong\u003e 21.6mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField Stop:\u003c\/strong\u003e 43mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1007 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\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 Waterproof Eyepiece combines an 82° apparent field with a 30mm focal length in a 2\" barrel. It has 7 elements in 4 groups, 21.6mm of eye relief, a 43mm field stop and an O-ring sealed, argon-purged housing, and weighs 1007 g.\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 Explore Scientific 82° 30mm: An Immersive 2\" Low-Power Eyepiece\u003c\/h3\u003e\n\u003cp\u003eAt 30mm it is the longest focal length in the 82° Series, so it gives the lowest magnification and the widest true field of the series in a given telescope, which suits finding objects and sweeping the Milky Way.\u003c\/p\u003e\n\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° Apparent Field at 30mm\u003c\/h3\u003e\n\u003cp\u003eThe effect of the 82° field and long eye relief is a full-immersion experience. The comfortable ultra-wide field promotes relaxation at the eyepiece, so it is easier to observe for longer and details begin to materialize that were not apparent at first glance.\u003c\/p\u003e\n\u003cp\u003eThe wide field also makes averted vision easy: looking slightly to the side of a faint object puts its light on a part of your eye that is more sensitive to light, allowing you to see fainter 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\u003e21.6mm of Eye Relief for Uncompromised Viewing Comfort\u003c\/h3\u003e\n\u003cp\u003eThe eyepiece features a generous 21.6mm of eye relief, which is the distance your eye must be from the top lens to see the entire field of view. You do not need to press your eye against the lens.\u003c\/p\u003e\n\u003cp\u003eLong relief is a must for eyeglass wearers because it allows them to enjoy the full field of 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 7-Element\/4-Group Design with EMD Coatings\u003c\/h3\u003e\n\u003cp\u003eThe 30mm has 7 lens elements in 4 groups. The computer design, combining low dispersion and high refractive index glasses with durable EMD coatings, is optimized for high contrast, high resolution and flat field characteristics.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Multilayer Deposition (EMD) Coatings:\u003c\/strong\u003e Durable EMD coatings on the lenses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEdge-Blackened Lenses:\u003c\/strong\u003e Lens edges are blackened to minimize scattering of light within the lenses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal Baffling:\u003c\/strong\u003e All internal surfaces of the barrel are flat black to keep internal reflections to a minimum.\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 Waterproofing for All-Weather Reliability\u003c\/h3\u003e\n\u003cp\u003eEach 82° Series eyepiece is O-ring sealed and purged with an inert gas to create a waterproof environment and a fog-proof housing.\u003c\/p\u003e\n\u003cp\u003eThe lenses sit in precision machined metal barrels that keep the optical train aligned for years of rugged use in 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 Tapered 2\" Barrel\u003c\/h3\u003e\n\u003cp\u003eThe 43mm field stop needs a 2\" barrel. The eyepiece measures 131mm long and 82mm wide and weighs 1007 g, so use a \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e that holds it firmly.\u003c\/p\u003e\n\u003cp\u003eA tapered 2\" barrel adds extra security.\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\u003eCalculating True Field of View from the 43mm Field Stop\u003c\/h3\u003e\n\u003cp\u003eThe true field of view (TFOV), how much actual sky the eyepiece shows, is determined by its 43mm field stop diameter and your telescope's focal length. You can estimate the TFOV in degrees using the formula: \u003cstrong\u003eTFOV ≈ (Field Stop \/ Telescope Focal Length) * 57.3\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eFor example:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2000mm focal length:\u003c\/strong\u003e about 1.23°.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1200mm focal length:\u003c\/strong\u003e about 2.05°.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e800mm focal length:\u003c\/strong\u003e about 3.08°.\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\u003e30mm Focal Length: Calculating Magnification for Your Telescope\u003c\/h3\u003e\n\u003cp\u003eTo calculate the magnification this eyepiece will provide with your telescope, use the formula: \u003cstrong\u003eMagnification = Telescope Focal Length \/ 30mm\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe resulting power will vary depending on your instrument:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2800mm focal length:\u003c\/strong\u003e Magnification is 93x.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2000mm focal length:\u003c\/strong\u003e Magnification is 67x.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1200mm focal length:\u003c\/strong\u003e Magnification is 40x.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e700mm focal length:\u003c\/strong\u003e Magnification is 23x.\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\u003eExpanding Magnification with Explore Scientific Focal Extenders\u003c\/h3\u003e\n\u003cp\u003eExplore Scientific Focal Extenders raise magnification while keeping the eyepiece's native apparent field and eye relief.\u003c\/p\u003e\n\u003cp\u003eThe 2\" models give:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith a 2x Focal Extender (FE02-020):\u003c\/strong\u003e The eyepiece performs like a 15mm, 82° eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith a 3x Focal Extender (FE03-020):\u003c\/strong\u003e It performs like a 10mm, 82° eyepiece.\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\u003eBuilt for the Field: Durability and Handling a 1007g Eyepiece\u003c\/h3\u003e\n\u003cp\u003eThe Explore Scientific 82° 30mm is constructed from a precision-machined metal barrel and optical housing, built for years of rugged use. At 1007 g (35.5 oz), expect to rebalance the telescope when switching to or from small 1.25\" eyepieces.\u003c\/p\u003e\n\u003cp\u003eThe sealed design keeps contaminants out and makes cleaning easy.\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° 30mm eyepiece \"waterproof\" and \"argon-purged\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eEach eyepiece is O-ring sealed and purged with an inert gas to create a waterproof environment, giving a \u003cstrong\u003efog-proof housing\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow wide a true field does the 30mm give?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith its 43mm field stop the true field is about 3.1° at 800mm focal length, 2.05° at 1200mm and 1.23° at 2000mm.\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 ES 30mm eyepiece help with observing faint objects?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 82° field relaxes your eye so you can observe longer, and makes \u003cstrong\u003eaverted vision\u003c\/strong\u003e easy: looking slightly to the side puts the image on a more light-sensitive part of your eye, allowing you to see fainter images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 30mm with a Focal Extender?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Explore Scientific Focal Extenders suit this series; the 2\" models are the FE02-020 (2x) and FE03-020 (3x). The \u003cstrong\u003e2x\u003c\/strong\u003e gives the magnification of a 15mm eyepiece, doubling the magnification while maintaining the comfortable 21.6mm 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 view does the 30mm give at 2800mm focal length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt 2800mm focal length it gives \u003cstrong\u003e93x\u003c\/strong\u003e and a true field of about 0.88°.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow much does the Explore Scientific 82° 30mm eyepiece weigh and will I need to rebalance my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe eyepiece weighs \u003cstrong\u003e1007 grams (2.2 lbs)\u003c\/strong\u003e. Expect to rebalance when switching between it and lighter 1.25\" eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWith 21.6mm of eye relief, is the ES 82° 30mm eyepiece suitable for observers who wear glasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt has \u003cstrong\u003e21.6mm of eye relief\u003c\/strong\u003e. Long relief is a must for eyeglass wearers because it allows them to enjoy the full field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I calculate the true field of view for my telescope with the ES 82° 30mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe true field of view depends on the eyepiece's 43mm field stop and your telescope's focal length. You can estimate it with the formula: \u003cstrong\u003eTFOV ≈ (43mm \/ Telescope Focal Length in mm) * 57.3\u003c\/strong\u003e. For a telescope with a 2000mm focal length, the true field would be approximately 1.23 degrees.\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 43mm field stop on the Explore Scientific 82° 30mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e43mm field stop\u003c\/strong\u003e is the physical aperture inside the eyepiece that defines the edge of the field of view. Its large size is what enables the eyepiece to deliver an extremely wide true field of view on the sky, allowing you to frame massive deep-sky objects in a single view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat magnification does the 30mm give at 1200mm focal length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUsing the formula (Telescope Focal Length \/ Eyepiece Focal Length), the magnification would be 1200mm \/ 30mm = \u003cstrong\u003e40x\u003c\/strong\u003e. \u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the optical design of the Explore Scientific 82° 30mm contribute to image quality?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe eyepiece uses a \u003cstrong\u003e7-element, 4-group design\u003c\/strong\u003e with low-dispersion glass and Enhanced Multilayer Deposition (EMD) coatings. It is optimized for high contrast, high resolution and flat field characteristics, with blackened lens edges and flat black internal surfaces to keep internal reflections to a minimum.\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\u003e812257014644\u003c\/td\u003e\n\u003c\/tr\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\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\u003e21.6mm\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\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e43mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e7 in 4 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1007 g\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° 30mm 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\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":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\u003c\/li\u003e\n\u003cli\u003e100° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" Barrel with a tapered design for enhanced security in the focuser\u003c\/li\u003e\n\u003cli\u003eArgon-purged, waterproof, tested to 1 meter for 30 minutes\u003c\/li\u003e\n\u003cli\u003e9-element optical design with fully multi-coated and edge-blackened lenses\u003c\/li\u003e\n\u003cli\u003eWeighs 612 g, requiring proper telescope balance\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 is the shortest focal length in Explore Scientific's 100° Series. It has 9 elements, a 9.6mm field stop and 10.5mm of eye relief in a tapered 2\" barrel, weighs 612 g, and is sealed and purged with dry argon gas.\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 Viewing for the Dedicated Observer\u003c\/h3\u003e\n\u003cp\u003eAt 5.5mm it gives the highest magnification of the 100° Series in a given telescope.\u003c\/p\u003e\n\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\u003c\/h3\u003e\n\u003cp\u003eYou may be startled at the wide expanse of inky black sky the first time you look through a 100° Series eyepiece, and may even forget there is an eyepiece between you and the universe. The huge field gives a panoramic view and relaxes the eye, so you can pay attention to subtle details for extended periods.\u003c\/p\u003e\n\u003cp\u003eWith an apparent field close to the maximum for hyper-wide designs, objects are easier to locate, and in a non-driven telescope an object stays in the field a very long time before any adjustment is needed.\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 Note on the 10.5mm Eye Relief\u003c\/h3\u003e\n\u003cp\u003eThe Explore Scientific 100° 5.5mm eyepiece has an eye relief of 10.5mm. This is the distance from the top lens of the eyepiece to the point where your eye must be positioned to see the full field of view. A shorter eye relief is a common trade-off in high-power, wide-field eyepiece 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\u003eA 9-Element Design\u003c\/h3\u003e\n\u003cp\u003eThe 5.5mm uses 9 lens elements. It has an optimized optical design, exotic glass combinations for optimum results and durable coatings.\u003c\/p\u003e\n\u003cp\u003eAll 100° Series eyepieces are fully multi-coated and edge-blackened to produce maximum contrast.\u003c\/p\u003e\n\u003cul\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 and Waterproof to 1 Meter\u003c\/h3\u003e\n\u003cp\u003eEach 100° Series eyepiece is internally sealed and purged with inert, dry argon gas, with a waterproof, fog-proof housing.\u003c\/p\u003e\n\u003cp\u003eIt says the purge also maximizes the life of the internal coatings, and that every 100° eyepiece is tested by submerging it to 1 meter of water 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 2-Inch Barrel and 612 g Build\u003c\/h3\u003e\n\u003cp\u003eThe eyepiece needs a 2\" \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e or \u003ca href=\"\/collections\/diagonals\"\u003ediagonal\u003c\/a\u003e. The barrel is tapered for extra security. It measures 150mm long and 56mm wide.\u003c\/p\u003e\n\u003cp\u003eAt 612 g (21.6 oz), you may need to rebalance the telescope when switching from a small 1.25\" 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\u003eCalculating the 9.6mm Field Stop's True Field\u003c\/h3\u003e\n\u003cp\u003eThe true field of view (TFoV) is the actual patch of sky you see through the eyepiece. It is determined by the eyepiece's field stop diameter and the focal length of your telescope. For the 5.5mm eyepiece, the field stop is 9.6mm. To calculate the TFoV in degrees, you use the formula: (Field Stop Diameter \/ Telescope Focal Length) x 57.3.\u003c\/p\u003e\n\u003cp\u003eFor example, in a telescope with a 2000mm focal length, the calculation would be: (9.6mm \/ 2000mm) x 57.3 = 0.275°. While this is a narrow patch of sky, the 100° apparent field makes this small window feel vast and immersive. At 1200mm focal length, the true field would be larger: (9.6mm \/ 1200mm) x 57.3 = 0.458°.\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\u003ePower Potential with a 5.5mm Focal Length\u003c\/h3\u003e\n\u003cp\u003eMagnification is calculated by dividing your telescope's focal length by the eyepiece's focal length. \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e600mm focal length:\u003c\/strong\u003e 600 \/ 5.5 = 109x.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1200mm focal length:\u003c\/strong\u003e 1200 \/ 5.5 = 218x.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2000mm focal length:\u003c\/strong\u003e 2000 \/ 5.5 = 364x.\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\u003eReaching Extreme Magnification with Focal Extenders\u003c\/h3\u003e\n\u003cp\u003eOptional \u003ca href=\"\/collections\/barlows-and-extenders\"\u003efocal extenders\u003c\/a\u003e are available for the 100° Series, and a focal extender increases the magnification of any eyepiece with the same barrel size. With a 5.5mm eyepiece they mainly suit short focal length telescopes.\u003c\/p\u003e\n\u003cp\u003eThe catalog lists two 2\" models:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2x Focal Extender (FE02-020):\u003c\/strong\u003e This accessory effectively transforms the 5.5mm eyepiece into a 2.75mm eyepiece, doubling its magnification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3x Focal Extender (FE03-020):\u003c\/strong\u003e This accessory turns the 5.5mm eyepiece into an effective 1.83mm eyepiece.\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\u003eWhat's Included with Your Eyepiece\u003c\/h3\u003e\n\u003cp\u003eThe package holds the eyepiece itself, for any telescope with a 2-inch focuser or diagonal.\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 eye relief of the 5.5mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003e10.5mm\u003c\/strong\u003e, the shortest in the 100° Series.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow heavy is the 5.5mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt has \u003cstrong\u003e9 glass elements\u003c\/strong\u003e in a sealed, waterproof body 150mm long. Be prepared to rebalance your telescope when using it.\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 argon-purged, waterproof design?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe eyepiece has a \u003cstrong\u003efog-proof housing\u003c\/strong\u003e, the argon purge maximizes the life of the internal coatings, and every 100° eyepiece is tested by submerging it to 1 meter of water for 30 minutes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Explore Scientific 5.5mm eyepiece fit my telescope's 1.25\" focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This eyepiece has a \u003cstrong\u003e2-inch barrel\u003c\/strong\u003e and requires a telescope with a 2-inch focuser or a 2-inch diagonal. It is physically too large to fit into a 1.25-inch focuser or adapter.\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\u003eHyper-wide eyepieces make it easy to gaze slightly to the side of an object, which puts the image on a part of your eye that is more sensitive to light, allowing you to see fainter images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat magnification does the 5.5mm give at 2000mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e2000 \/ 5.5 = \u003cstrong\u003eabout 364x\u003c\/strong\u003e, very high power that needs steady air.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"edge-blackened\" optics mean for the Explore Scientific 100° series?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe lens edges are blackened. The full multi-coating and edge blackening produce maximum contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the tapered barrel on the Explore Scientific 5.5mm eyepiece improve security?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe tapered barrel adds extra security.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow large is the 5.5mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is 150mm long and 56mm wide, with a weight of 612 g (21.6 oz).\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\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\u003c\/td\u003e\n\u003ctd\u003e100°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e10.5mm\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\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e9.6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e9 elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e612 g\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° 5.5mm 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\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\u003cli\u003e14.5mm 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\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 a hyper-wide 100° apparent field of view through a robust 2-inch barrel, with 9 lens elements, a 24.4mm field stop and 14.5mm of eye relief. The body is sealed, purged with dry argon gas and tested by submersion to 1 meter for 30 minutes, and weighs 836 g.\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° Series Experience\u003c\/h3\u003e\n\u003cp\u003eYou may be startled at the wide expanse of inky black sky the first time you look through a 100° Series eyepiece, and may even forget there is an eyepiece between you and the universe. In a non-driven telescope, an object stays in the field a very long time before any adjustment is needed.\u003c\/p\u003e\n\u003cp\u003eIt says the huge field relaxes the eye so you can pay attention to subtle details for extended periods, and makes averted vision easy: looking slightly to the side of a faint object puts the image on a part of your eye that is more sensitive to light, allowing you to see fainter 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\u003eThe Visual Impact of a 100° Apparent Field\u003c\/h3\u003e\n\u003cp\u003eThe 100° field is close to the maximum for hyper-wide eyepiece design, giving a panoramic visual experience.\u003c\/p\u003e\n\u003cp\u003eIt says objects are easier to locate with such a 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\u003e14.5mm Eye Relief and Observing Comfort\u003c\/h3\u003e\n\u003cp\u003eEye relief is the fixed distance from the eyepiece's top lens to the point where your eye must be positioned to see the full field of view. The Explore Scientific 100° 14mm has an eye relief of 14.5mm. \u003c\/p\u003e\n\u003cp\u003eExplore Scientific does not say how much of the field eyeglass wearers see.\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\u003e9-Element Construction\u003c\/h3\u003e\n\u003cp\u003eThe 14mm uses 9 lens elements. It has an optimized optical design, exotic glass combinations for optimum results and durable coatings.\u003c\/p\u003e\n\u003cp\u003eAll 100° Series eyepieces are fully multi-coated and edge-blackened to produce maximum contrast.\u003c\/p\u003e\n\u003cul\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 and Waterproof to 1 Meter\u003c\/h3\u003e\n\u003cp\u003eEach 100° Series eyepiece is internally sealed and purged with inert, dry argon gas, with a waterproof, fog-proof housing.\u003c\/p\u003e\n\u003cp\u003eIt says the purge also maximizes the life of the internal coatings, and every 100° eyepiece is tested by submerging it to 1 meter of water 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 2-Inch, 836 g Tapered Barrel\u003c\/h3\u003e\n\u003cp\u003eThe 100° 14mm uses a 2-inch barrel. Measuring 157mm in length and 70mm in diameter, this is a substantial ocular with a weight of 836 grams (29.4 oz). \u003c\/p\u003e\n\u003cp\u003eObservers should be mindful of this weight, as it may require rebalancing the telescope when switching from a much lighter 1.25-inch eyepiece. The barrel is tapered for extra security.\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\u003eCalculating True Field with a 24.4mm Field Stop\u003c\/h3\u003e\n\u003cp\u003eThe eyepiece's field stop is the physical metal ring inside the barrel that creates the sharp, black edge of the field of view. Its diameter is the ultimate limit on how much sky you can see. For the 14mm 100° eyepiece, this diameter is 24.4mm.\u003c\/p\u003e\n\u003cp\u003eYou can calculate the true field of view (TFoV) this eyepiece will deliver in your specific telescope using the field stop diameter. The approximate formula is: TFoV ≈ (Field Stop Diameter \/ Telescope Focal Length) x 57.3. For example, in a telescope with a 2000mm focal length, the 14mm eyepiece would yield a true field of approximately (24.4mm \/ 2000mm) x 57.3 ≈ 0.7 degrees. At 1200mm it is about 1.17 degrees.\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\u003ePower Calculations for the 14mm Focal Length\u003c\/h3\u003e\n\u003cp\u003eThe magnification is determined by your telescope's focal length, calculated with the simple formula: Magnification = Telescope Focal Length \/ 14mm.\u003c\/p\u003e\n\u003cp\u003eHere are a few examples to illustrate its range:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e600mm focal length:\u003c\/strong\u003e 600 \/ 14 = 43x.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1200mm focal length:\u003c\/strong\u003e 1200 \/ 14 = 86x.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2000mm focal length:\u003c\/strong\u003e 2000 \/ 14 = 143x.\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\u003eUsing Explore Scientific 2-Inch Focal Extenders\u003c\/h3\u003e\n\u003cp\u003eOptional \u003ca href=\"\/collections\/barlows-and-extenders\"\u003efocal extenders\u003c\/a\u003e are available for the 100° Series, and a focal extender increases the magnification of any eyepiece with the same barrel size.\u003c\/p\u003e\n\u003cp\u003eWith the 2-inch barrel, you can use the following models:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific FE02-020 (2x):\u003c\/strong\u003e This doubles the magnification, effectively turning your 14mm eyepiece into a high-power 7mm eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific FE03-020 (3x):\u003c\/strong\u003e This triples the magnification, yielding an effective focal length of approximately 4.7mm.\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\u003eCare, Storage, and What's Included\u003c\/h3\u003e\n\u003cp\u003eBecause the housing is sealed, only the outer lenses ever need cleaning, and only when needed.\u003c\/p\u003e\n\u003cp\u003eWhen not in use, the eyepiece should be stored with both dust caps in place to protect the optical surfaces. The eyepiece ships with the following components:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e14mm 100° Waterproof Eyepiece:\u003c\/strong\u003e The main eyepiece body.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDust Cap (Top):\u003c\/strong\u003e Protects the large eye lens.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDust Cap (Bottom):\u003c\/strong\u003e Protects the 2-inch barrel and field lens.\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 the 14mm give at 2000mm focal length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbout 143x and a true field of about 0.7°.\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\u003eEach eyepiece has a waterproof, \u003cstrong\u003efog-proof housing\u003c\/strong\u003e, the \u003cstrong\u003eargon purge\u003c\/strong\u003e maximizes the life of the internal coatings, and every 100° eyepiece is tested by submersion to 1 meter for 30 minutes.\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\u003eIn a non-driven telescope, an object stays in the 100° field a very long time before any adjustment is needed.\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\u003eIt has 14.5mm of eye relief. Explore Scientific does not say how much of the field eyeglass wearers see.\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 \u003cstrong\u003e100° Series\u003c\/strong\u003e has the wider field; the \u003cstrong\u003e92° Series\u003c\/strong\u003e is an extra long eye relief design (about 20mm on the 17mm, against 14.5mm here).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I calculate the True Field of View for my telescope with the ES 100° 14mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou can calculate the approximate True Field of View (TFoV) using the eyepiece's 24.4mm field stop diameter and your telescope's focal length. The formula is: \u003cstrong\u003eTFoV ≈ (24.4 \/ Your Telescope's Focal Length in mm) x 57.3\u003c\/strong\u003e. The result will be the width of the patch of sky you can see, measured in degrees.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat magnification will the ES 100° 14mm give on my 1200mm focal length Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOn a telescope with a 1200mm focal length, the Explore Scientific 14mm eyepiece will provide \u003cstrong\u003e86x magnification\u003c\/strong\u003e (1200mm \/ 14mm = 85.7).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich Explore Scientific focal extenders can I use with the 100° 14mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBecause the 14mm eyepiece has a 2-inch barrel, you can use Explore Scientific's 2-inch focal extenders. The compatible models are the \u003cstrong\u003eFE02-020 (2x)\u003c\/strong\u003e and the \u003cstrong\u003eFE03-020 (3x)\u003c\/strong\u003e. These will increase the magnification by a factor of two or three, respectively,.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 836g weight of the ES 100° 14mm affect balancing my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt 836 g (29.4 oz), you will likely need to rebalance when switching to it from a lighter 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 edge-blackened lenses in the ES 100° 14mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe lens edges are blackened. The full multi-coating and edge blackening produce maximum contrast.\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\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e14.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e24.4mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e9 elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e836 g\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\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\u003e20mm Focal Length\u003c\/li\u003e\n\u003cli\u003e100° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e14.5mm Eye Relief\u003c\/li\u003e\n\u003cli\u003e2-inch Diameter Barrel\u003c\/li\u003e\n\u003cli\u003e9-Element Optical 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\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 through its 2-inch barrel, supported by a 9-element optical design. With a focal length of 20mm and a substantial 34.8mm field stop, it has 14.5mm of eye relief and a tapered barrel. Each eyepiece is sealed, purged with dry argon gas and tested by submersion to 1 meter for 30 minutes; it weighs 916 g.\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: A Panoramic Viewing Experience\u003c\/h3\u003e\n\u003cp\u003eThe huge 100° field gives a panoramic visual experience and relaxes the eye, so you can pay attention to subtle details for extended periods.\u003c\/p\u003e\n\u003cp\u003eIt adds that objects are easier to locate, and in a non-driven telescope an object stays in the field a very long time before any adjustment is needed. Hyper-wide eyepieces also make averted vision easy: looking slightly to the side of a faint object puts the image on a part of your eye that is more sensitive to light.\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\u003e9-Element Optical Design\u003c\/h3\u003e\n\u003cp\u003eThe optical system of the 20mm eyepiece consists of 9 distinct lens elements. It has an optimized optical design and exotic glass combinations, and all 100° Series eyepieces are fully multi-coated and edge-blackened to produce maximum contrast.\u003c\/p\u003e\n\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 for 30 Minutes\u003c\/h3\u003e\n\u003cp\u003eEach 100° Series eyepiece is internally sealed and purged with inert, dry argon gas, which also maximizes the life of the internal coatings, with a waterproof, fog-proof housing.\u003c\/p\u003e\n\u003cp\u003eEvery 100° eyepiece is tested by submerging it to 1 meter of water 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 2-inch Barrel: Fit, Security, and a 916 g Build\u003c\/h3\u003e\n\u003cp\u003eThe Explore Scientific 100° 20mm eyepiece uses a 2-inch barrel; the barrel is tapered for extra security. It weighs 916 g.\u003c\/p\u003e\n\u003cp\u003eWith a length of 156mm and a maximum width of 70mm, this is a substantial ocular. When using it, you should ensure your \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e can handle the weight and that your telescope mount is properly balanced. \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\u003e14.5mm Eye Relief: Comfort and Viewing Technique\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece features an eye relief of 14.5mm, which is the distance from the top lens to the point where your eye must be positioned to see the full field of view. \u003c\/p\u003e\n\u003cp\u003eExplore Scientific does not say how much of the field eyeglass wearers see.\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\u003eCalculating True Field from the 34.8mm Field Stop\u003c\/h3\u003e\n\u003cp\u003eThe true field of view, how much actual sky the eyepiece shows, is determined by its 34.8mm field stop diameter and your telescope's focal length. The field stop is the physical metal ring inside the eyepiece barrel that defines the edge of the view.\u003c\/p\u003e\n\u003cp\u003eYou can estimate the true field of view (TFoV) in degrees using the following formula: \u003cstrong\u003eTFoV ≈ (Field Stop Diameter \/ Telescope Focal Length) x 57.3\u003c\/strong\u003e. For example, in a telescope with a 1500mm focal length, this 20mm eyepiece would yield a true field of approximately 1.33 degrees (about 1.66° at 1200mm and 1.0° at 2000mm).\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\u003e20mm Focal Length: Magnification\u003c\/h3\u003e\n\u003cp\u003eThe magnification is calculated by dividing your telescope's focal length by the eyepiece's focal length (20mm). For instance, 1200mm gives 60x and 2000mm gives 100x.\u003c\/p\u003e\n\u003cp\u003eOptional \u003ca href=\"\/collections\/barlows-and-extenders\"\u003efocal extenders\u003c\/a\u003e are available for the 100° Series. The 2\" FE02-020 (2x) gives the magnification of a 10mm eyepiece and the FE03-020 (3x) that of a 6.7mm.\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 does the 20mm give at 2000mm focal length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e100x and a true field of about 1.0°.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the eye relief of the 100° 20mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt has \u003cstrong\u003e14.5mm of eye relief\u003c\/strong\u003e. Explore Scientific does not say how much of the field eyeglass wearers see.\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?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 100° Series is internally sealed and purged with inert, dry argon gas, giving a fog-proof housing and maximizing the life of the internal coatings.\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. Its \u003cstrong\u003e34.8mm field stop\u003c\/strong\u003e is wider than a 1.25-inch barrel.\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\u003eExplore Scientific tests every 100° eyepiece by submerging it to 1 meter of water for 30 minutes to make sure the seal holds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow heavy is the Explore Scientific 100° 20mm eyepiece and will it affect my telescope's balance?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe eyepiece weighs \u003cstrong\u003e916 g (2.02 lbs)\u003c\/strong\u003e. Expect to rebalance when switching from a much lighter 1.25-inch eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes Explore Scientific state a filter thread?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eExplore Scientific does not state a filter thread for this eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich telescopes suit the 100° 20mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAny telescope with a 2-inch focuser or \u003ca href=\"\/collections\/diagonals\"\u003ediagonal\u003c\/a\u003e. The long time objects stay in view is a benefit with non-driven telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow large is the 100° 20mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt measures 156mm long and 70mm wide, with a weight of 916 g.\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\u003c\/td\u003e\n\u003ctd\u003e100°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e14.5mm\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\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e34.8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e9 elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e916 g\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° 20mm 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\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\u003e9-Element Optical Design\u003c\/li\u003e\n\u003cli\u003e12.5mm 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\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 - 2\" combines a high-magnification 9mm focal length with a vast 100° apparent field of view, through 9 lens elements. The 2-inch barrel is tapered, and the body is sealed, purged with dry argon gas and tested by submersion to 1 meter for 30 minutes. It has a 15.7mm field stop and 12.5mm of eye relief and weighs 602 g.\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 Immersive Eyepiece for High-Power Observation\u003c\/h3\u003e\n\u003cp\u003eWith an apparent field close to the maximum for hyper-wide designs, objects are easier to locate, and in a non-driven telescope an object stays in the field a very long time before any adjustment is needed. The huge field also relaxes the eye, so you can pay attention to subtle details for extended periods.\u003c\/p\u003e\n\u003cp\u003eYou may be startled at the wide expanse of inky black sky the first time you look through a 100° Series eyepiece, and may even forget there is an eyepiece between you and the universe.\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 and 9mm Focal Length\u003c\/h3\u003e\n\u003cp\u003eThe 100° Series are hyper-wide class oculars that can transform your visual astronomy experience, with a panoramic view.\u003c\/p\u003e\n\u003cp\u003eThe 9mm focal length gives high magnification in most telescopes: 133x at 1200mm focal length. There is no specific target list for it.\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\u003e12.5mm of Eye Relief and Averted Vision\u003c\/h3\u003e\n\u003cp\u003eThe Explore Scientific 100° 9mm eyepiece features an eye relief of 12.5mm. This specification defines the distance from the eyepiece's top lens to the point where your eye must be positioned to see the full field of view. \u003c\/p\u003e\n\u003cp\u003eExplore Scientific does not say how much of the field eyeglass wearers see. It does say hyper-wide eyepieces make averted vision easy: looking slightly to the side of a faint object puts the image on a part of your eye that is more sensitive to light, allowing you to see fainter 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\u003eA 9-Element Design\u003c\/h3\u003e\n\u003cp\u003eThe 9mm uses 9 lens elements. It has an optimized optical design, exotic glass combinations for optimum results and durable coatings, and all 100° Series eyepieces are fully multi-coated and edge-blackened to produce maximum 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\u003eWaterproofing: Argon-Purged and Tested to 1 Meter\u003c\/h3\u003e\n\u003cp\u003eEach 100° Series eyepiece is internally sealed and purged with inert, dry argon gas, with a waterproof, fog-proof housing.\u003c\/p\u003e\n\u003cp\u003eThe purge also maximizes the life of the internal coatings, and every 100° eyepiece is tested by submerging it to 1 meter of water 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\u003eA 602g, 2-Inch Tapered Barrel Design\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece is built with a standard 2-inch barrel, requiring a telescope equipped with a 2-inch \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e or \u003ca href=\"\/collections\/diagonals\"\u003ediagonal\u003c\/a\u003e. At a weight of 602 g (21.2 oz), it is a substantial ocular that adds considerable mass to the focuser end of a telescope. It measures 145mm long and 60mm wide. Expect to rebalance when switching from small 1.25-inch eyepieces.\u003c\/p\u003e\n\u003cp\u003eThe barrel is tapered for extra security.\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 15.7mm Field Stop and True Field of View\u003c\/h3\u003e\n\u003cp\u003eThe field stop is a physical ring inside the eyepiece that defines the sharp edge of the field of view. The Explore Scientific 100° 9mm has a field stop diameter of 15.7mm. This value, along with your telescope's focal length, determines the actual patch of sky, or True Field of View (TFOV), that you will see.\u003c\/p\u003e\n\u003cp\u003eYou can calculate the TFOV in degrees using the formula: TFOV ≈ (Field Stop Diameter \/ Telescope Focal Length) × 57.3. For example, in a telescope with a 1200mm focal length, the TFOV would be approximately (15.7 \/ 1200) × 57.3 ≈ 0.75 degrees. At 2000mm it is about 0.45 degrees.\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\u003eCalculating Magnification with a 9mm Eyepiece\u003c\/h3\u003e\n\u003cp\u003eThe magnification of any eyepiece is determined by dividing your telescope's focal length by the eyepiece's focal length. With its 9mm focal length, this eyepiece is designed to produce high power in most amateur telescopes.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFormula:\u003c\/strong\u003e Magnification = Telescope Focal Length (mm) \/ 9mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1200mm focal length:\u003c\/strong\u003e 1200 \/ 9 = 133x magnification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2000mm focal length:\u003c\/strong\u003e 2000 \/ 9 = 222x.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e700mm focal length:\u003c\/strong\u003e 700 \/ 9 = 78x.\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\u003eExpanding Magnification with 2-Inch Focal Extenders\u003c\/h3\u003e\n\u003cp\u003eYou can increase the versatility of the 9mm eyepiece by pairing it with an Explore Scientific \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eFocal Extender\u003c\/a\u003e. Because this eyepiece uses a 2-inch barrel, it is compatible with Explore Scientific's 2-inch focal extenders. Optional focal extenders are available for the 100° Series.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith a 2x Focal Extender (FE02-020):\u003c\/strong\u003e The 9mm eyepiece behaves like a 4.5mm eyepiece, doubling the magnification. In a 1200mm telescope, this would increase the power from 133x to 266x.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith a 3x Focal Extender (FE03-020):\u003c\/strong\u003e The eyepiece performs like a 3mm eyepiece, tripling the magnification. In the same 1200mm telescope, this provides a very high power of 400x.\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\u003eCare and Contents: Maintaining Your Waterproof Eyepiece\u003c\/h3\u003e\n\u003cp\u003eBecause the housing is sealed, only the outer lens surfaces ever need cleaning, and only when needed.\u003c\/p\u003e\n\u003cp\u003eThe box holds the eyepiece itself.\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 does the 9mm give at 1200mm focal length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e133x and a true field of about 0.75°. In a non-driven telescope an object stays in the 100° field a very long time before you need to adjust.\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\u003eObjects are easier to locate, stay in the field a very long time in a non-driven telescope, and the huge field relaxes the eye so you can study subtle details longer.\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 100° 9mm useful?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eKey points:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFog-proof:\u003c\/strong\u003e a waterproof, fog-proof housing, internally sealed and purged with dry argon.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoatings:\u003c\/strong\u003e the purge maximizes the life of the internal coatings; every 100° eyepiece is tested by submersion to 1 meter for 30 minutes.\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-inch focuser to use the Explore Scientific 100° 9mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. This eyepiece has a 2-inch diameter barrel and requires a telescope with a 2-inch focuser or a 2-inch diagonal. 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\"\u003eWhat is the eye relief of the 100° 9mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e12.5mm. Explore Scientific does not say how much of the field eyeglass wearers see.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 602g weight of the ES 100° 9mm affect telescope balance?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt 602 g (21.2 oz), be prepared to rebalance the telescope when switching from a lightweight 1.25\" eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I calculate the true field of view for the ES 100° 9mm eyepiece in my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou can get a precise calculation by using the eyepiece's 15.7mm field stop and your telescope's focal length. The formula is: \u003cstrong\u003eTrue Field of View (in degrees) ≈ (15.7mm \/ Telescope Focal Length in mm) × 57.3\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich Explore Scientific focal extenders work with the 100° 9mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eSince the 100° 9mm has a 2-inch barrel, it is compatible with Explore Scientific's 2-inch focal extenders. The catalog lists the \u003cstrong\u003eFE02-020 (2x)\u003c\/strong\u003e and the \u003cstrong\u003eFE03-020 (3x)\u003c\/strong\u003e, which will double and triple the eyepiece's magnification, respectively.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I safely clean the waterproof ES 100° 9mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eClean only the outer lenses, and only when needed; the sealed housing keeps the inside closed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow large is the 100° 9mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is 145mm long and 60mm wide, with a weight of 602 g (21.2 oz).\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\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e12.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e15.7mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e9 elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e602 g\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° 9mm 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\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":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-Inch Barrel Diameter\u003c\/li\u003e\n\u003cli\u003e9-Element Optical Design\u003c\/li\u003e\n\u003cli\u003eWaterproof (1 Meter for 30 Minutes) and Argon-Purged\u003c\/li\u003e\n\u003cli\u003e14.5mm Eye Relief\u003c\/li\u003e\n\u003cli\u003e1177 g Weight\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° 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, built around a complex 9-element optical design. With its substantial 41mm field stop and 14.5mm of eye relief, it has a tapered barrel and weighs 1177 g. It is sealed, purged with dry argon gas and tested by submersion to 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° Apparent Field of View\u003c\/h3\u003e\n\u003cp\u003eYou may be startled at the wide expanse of inky black sky the first time you look through a 100° Series eyepiece, and may even forget there is an eyepiece between you and the universe. Objects are easier to locate, and in a non-driven telescope an object stays in the field a very long time before any adjustment is needed.\u003c\/p\u003e\n\u003cp\u003eHyper-wide eyepieces also make averted vision easy: looking slightly to the side of a faint object puts the image on a part of your eye that is more sensitive to light, allowing you to see fainter 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\u003eA 9-Element, Fully Multi-Coated Optical System\u003c\/h3\u003e\n\u003cp\u003eThe 25mm uses 9 lens elements. It has an optimized optical design, exotic glass combinations for optimum results and durable coatings.\u003c\/p\u003e\n\u003cp\u003eAll 100° Series eyepieces are fully multi-coated and edge-blackened to produce maximum contrast.\u003c\/p\u003e\n\u003cul\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\u003eManaging 14.5mm of Eye Relief for Viewing Comfort\u003c\/h3\u003e\n\u003cp\u003eThe eyepiece features an eye relief of 14.5mm, which is the fixed distance from the top lens to the point where your eye must be positioned to see the full field of view. \u003c\/p\u003e\n\u003cp\u003eExplore Scientific does not say how much of the field eyeglass wearers see.\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\u003eEach 100° Series eyepiece is internally sealed and purged with inert, dry argon gas, which also maximizes the life of the internal coatings, with a waterproof, fog-proof housing.\u003c\/p\u003e\n\u003cp\u003eEvery 100° eyepiece is tested by submerging it to 1 meter of water 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 2-Inch Barrel and 1177g Weight\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece is built with a standard 2-inch barrel, designed to fit any telescope with a 2-inch \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e or \u003ca href=\"\/collections\/diagonals\"\u003ediagonal\u003c\/a\u003e. The barrel is tapered for extra security. It measures 140mm long and 73mm wide.\u003c\/p\u003e\n\u003cp\u003eAt 1177 g (41.5 oz), expect to rebalance your telescope when switching from a smaller 1.25-inch 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\u003eWhat the 41mm Field Stop Reveals About Your True Field\u003c\/h3\u003e\n\u003cp\u003eThe true field of view, the actual circle of sky you see, is determined not by the apparent field, but by the eyepiece's internal field stop diameter and your telescope's focal length. The 25mm 100° eyepiece has a large 41mm field stop, which is the physical aperture inside the eyepiece that defines the edge of the view.\u003c\/p\u003e\n\u003cp\u003eYou can calculate the true field of view in degrees using the formula: TFOV = (Field Stop Diameter \/ Telescope Focal Length) * 57.3. For example, in a telescope with a 2000mm focal length, this eyepiece would yield a true field of (41 \/ 2000) * 57.3 ≈ 1.17 degrees. At 1200mm it is about 1.96 degrees, and at 600mm about 3.9 degrees.\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\u003ePairing the 25mm Eyepiece with 2-Inch Focal Extenders\u003c\/h3\u003e\n\u003cp\u003eFor added versatility, the 25mm eyepiece can be paired with Explore Scientific's 2-inch \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eFocal Extenders\u003c\/a\u003e. Optional focal extenders are available for the 100° Series, and a focal extender increases the magnification of any eyepiece with the same barrel size.\u003c\/p\u003e\n\u003cp\u003eThe catalog lists two 2-inch models:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2x Focal Extender (FE02-020):\u003c\/strong\u003e Turns the 25mm eyepiece into a 12.5mm eyepiece, doubling the magnification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3x Focal Extender (FE03-020):\u003c\/strong\u003e Converts the 25mm eyepiece into an 8.3mm eyepiece.\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 the 25mm give at 1200mm focal length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e48x and a true field of about 1.96°. In a non-driven telescope an object stays in the 100° field a very long time before you need to adjust.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does argon purging do for the 25mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 100° Series is internally sealed and purged with inert, dry argon gas, giving a fog-proof housing and maximizing the life of the internal coatings.\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\u003eYes. At 1177 g (41.5 oz), you will almost certainly need to rebalance when switching from a smaller eyepiece.\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\u003eExplore Scientific does not state a filter thread for this eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the eye relief of the 100° 25mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt has 14.5mm of eye relief. Explore Scientific does not say how much of the field eyeglass wearers see.\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 25mm 100° eyepiece over a standard 25mm Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is the 100° apparent field of view, which is roughly double that of a standard 50° Plössl. At the same magnification, the 100° eyepiece shows a much larger patch of sky, about twice the width of sky.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"edge-blackened\" mean for the Explore Scientific 25mm 100° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe lens edges are blackened. The full multi-coating and edge blackening produce maximum contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow large is the 100° 25mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eDimensions are 140mm long and 73mm wide, with a weight of 1177 g (41.5 oz).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I calculate the magnification of the Explore Scientific 25mm 100° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTo find the magnification, divide your telescope's focal length by the eyepiece's focal length of 25mm. For example, in a telescope with a 1200mm focal length, this eyepiece provides 1200mm \/ 25mm = 48x 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\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\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e14.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e41mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e9 elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1177 g\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° 25mm 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\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 and Waterproof to 1 Meter for 30 Minutes\u003c\/li\u003e\n\u003cli\u003e9-Element Optical Design\u003c\/li\u003e\n\u003cli\u003e19mm Eye Relief\u003c\/li\u003e\n\u003cli\u003e52.2mm Field Stop\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° 30mm Waterproof Eyepiece - 3\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 100° 30mm Waterproof Eyepiece is the longest focal length in Explore Scientific's 100° Series and its only 3-inch model. It has 9 lens elements, 19mm of eye relief and a 52.2mm field stop, weighs 2353 g, and is sealed, purged with dry argon gas and tested by submersion to 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 Explore Scientific 100° 30mm Eyepiece: An Overview\u003c\/h3\u003e\n\u003cp\u003eYou may be startled at the wide expanse of inky black sky the first time you look through a 100° Series eyepiece, and may even forget there is an eyepiece between you and the universe.\u003c\/p\u003e\n\u003cp\u003eIt needs a telescope with a 3-inch \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e. As the longest focal length of the series it gives the lowest magnification and widest true field of the 100° Series in a given 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 100° Apparent Field\u003c\/h3\u003e\n\u003cp\u003eThe huge field gives a panoramic visual experience and relaxes the eye, so you can pay attention to subtle details for extended periods.\u003c\/p\u003e\n\u003cp\u003eIn a non-driven telescope, it says an object stays in the field a very long time before any adjustment is needed. Hyper-wide eyepieces also make averted vision easy: looking slightly to the side of a faint object puts the image on a part of your eye that is more sensitive to light, allowing you to see fainter 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\u003e19mm of Eye Relief for Extended Observation\u003c\/h3\u003e\n\u003cp\u003eThe 100° 30mm has 19mm of eye relief, the longest in the 100° Series. Eye relief is the fixed distance from the eyepiece's final lens to the point where your eye must be positioned to see the full field of view. A longer eye relief means you do not have to press your eye right up against the lens, reducing eye strain and making the viewing experience more comfortable and natural.\u003c\/p\u003e\n\u003cp\u003eExplore Scientific does not say how much of the field eyeglass wearers see.\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 9-Element System\u003c\/h3\u003e\n\u003cp\u003eThe 30mm uses 9 lens elements. It has an optimized optical design, exotic glass combinations for optimum results and durable coatings.\u003c\/p\u003e\n\u003cp\u003eAll 100° Series eyepieces are fully multi-coated and edge-blackened to produce maximum 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 and Waterproof to 1 Meter\u003c\/h3\u003e\n\u003cp\u003eEach 100° Series eyepiece is internally sealed and purged with inert, dry argon gas, with a waterproof, fog-proof housing.\u003c\/p\u003e\n\u003cp\u003eIt says the purge also maximizes the life of the internal coatings, and every 100° eyepiece is tested by submerging it to 1 meter of water 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 3-Inch Barrel and 2353g Build\u003c\/h3\u003e\n\u003cp\u003eIts 52.2mm field stop is wider than a 2-inch barrel, so the 30mm uses a 3-inch barrel. Barrels in the series are tapered for extra security.\u003c\/p\u003e\n\u003cp\u003eThis no-compromise optical design results in a substantial piece of equipment. The eyepiece weighs 2353 grams (over 5 pounds) and measures 200mm in length with a maximum width of 107mm. Use a 3-inch focuser that holds it firmly, and expect to rebalance the 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\u003eCalculating Your View with a 52.2mm Field Stop\u003c\/h3\u003e\n\u003cp\u003eThe field stop is the metal ring inside the eyepiece barrel that defines the sharp edge of the circular field of view. Its diameter is the ultimate limit on how much sky you can see. The Explore Scientific 100° 30mm eyepiece features a massive 52.2mm field stop, which is critical to delivering its expansive views.\u003c\/p\u003e\n\u003cp\u003eYou can calculate the true field of view (TFoV) this eyepiece will deliver on your specific telescope using a simple formula: \u003cstrong\u003eTFoV = (Field Stop Diameter \/ Telescope Focal Length) x 57.3\u003c\/strong\u003e. The result is the actual patch of sky you will see, measured in degrees.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2500mm focal length:\u003c\/strong\u003e the calculation would be (52.2 \/ 2500) x 57.3, resulting in a true field of view of approximately 1.2 degrees.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1800mm focal length:\u003c\/strong\u003e (52.2 \/ 1800) x 57.3 ≈ 1.66 degrees.\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\u003eLow-Power Performance with a 30mm Focal Length\u003c\/h3\u003e\n\u003cp\u003eMagnification is determined by the focal length of your telescope divided by the focal length of your eyepiece. With its 30mm focal length, this eyepiece is designed to provide very low power, which is ideal for wide-field scanning and observing large-scale celestial objects.\u003c\/p\u003e\n\u003cp\u003eTo determine the magnification this eyepiece will provide on your telescope, use the formula: \u003cstrong\u003eMagnification = Telescope Focal Length \/ 30mm\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExample 1:\u003c\/strong\u003e On a telescope with a 2500mm focal length, this eyepiece provides 2500 \/ 30 = 83x magnification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExample 2:\u003c\/strong\u003e On an instrument with a 1800mm focal length, it yields 1800 \/ 30 = 60x magnification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExample 3:\u003c\/strong\u003e With a very long focal length 3500mm telescope, it would provide 3500 \/ 30 = 117x magnification.\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\u003eSystem Integration: A 3-Inch Focuser Requirement\u003c\/h3\u003e\n\u003cp\u003eThe Explore Scientific 100° 30mm is a specialized piece of equipment that requires a telescope with a compatible 3-inch focuser. It will not fit in standard 1.25-inch or 2-inch focusers. \u003c\/p\u003e\n\u003cp\u003eWhile the Explore Scientific 100° series eyepiece line is designed to work with optional \u003ca href=\"\/collections\/barlows-and-extenders\"\u003efocal extenders\u003c\/a\u003e for increasing magnification, it is important to note that the Explore Scientific catalog currently lists focal extenders only in 1.25-inch and 2-inch barrel sizes. There is no compatible 3-inch focal extender offered by Explore Scientific for this eyepiece. Therefore, it is intended to be used at its native 30mm 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\u003eHandling and Care\u003c\/h3\u003e\n\u003cp\u003eAt 2353 g (82.9 oz), grip it firmly and secure it in the focuser. The box holds the eyepiece itself.\u003c\/p\u003e\n\u003cp\u003eThe sealed housing keeps the inside closed; clean only the outer lenses, and only when needed.\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 telescope is required for the Explore Scientific 100° 30mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAny telescope with a \u003cstrong\u003e3-inch focuser\u003c\/strong\u003e. It does not fit 1.25-inch or 2-inch focusers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the Explore Scientific 100° 30mm eyepiece have a 3-inch barrel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts 52.2mm field stop is wider than a 2-inch barrel, so it uses a \u003cstrong\u003e3-inch barrel\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow heavy is the 100° 30mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003e2353 g (82.9 oz)\u003c\/strong\u003e, 200mm long and 107mm wide. Expect to rebalance the telescope.\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\u003eHyper-wide eyepieces make \u003cstrong\u003eaverted vision\u003c\/strong\u003e easy: looking slightly to the side of an object puts the image on a part of your eye that is more sensitive to light, allowing you to see fainter images. Objects are also easier to locate.\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° 30mm eyepiece is waterproof?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt means the eyepiece is internally sealed with O-rings and purged with dry \u003cstrong\u003eargon gas\u003c\/strong\u003e. This prevents internal fogging in humid or cold conditions and protects the internal coatings from moisture. Each eyepiece is tested by being submerged in \u003cstrong\u003e1 meter of water for 30 minutes\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I calculate the true field of view for the Explore Scientific 100° 30mm eyepiece on my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou can calculate the true field of view (TFoV) in degrees using this formula: \u003cstrong\u003eTFoV = (52.2 \/ Your Telescope's Focal Length in mm) x 57.3\u003c\/strong\u003e. The eyepiece has a field stop of 52.2mm, which is the key number for this calculation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the eye relief of the 100° 30mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt has \u003cstrong\u003e19mm of eye relief\u003c\/strong\u003e, the longest in the 100° Series. Explore Scientific does not say how much of the field eyeglass wearers see.\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 100° 30mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eExplore Scientific does not state a filter thread for this eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs there a focal extender for the 100° 30mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The catalog lists focal extenders only in 1.25-inch and 2-inch sizes, so there is no Explore Scientific extender for this 3-inch 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\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\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e19mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e52.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e9 elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e2353 g\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\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\" Diameter Barrel\u003c\/li\u003e\n\u003cli\u003e12 Elements in 8 Groups\u003c\/li\u003e\n\u003cli\u003eArgon-Purged Waterproof Construction\u003c\/li\u003e\n\u003cli\u003eTapered 2\" Barrel\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 120° 9mm Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 120° 9mm Waterproof Eyepiece pairs a 120° apparent field, Explore Scientific's widest, with a 9mm focal length. It has 12 elements in 8 groups, a tapered 2\" barrel and an O-ring sealed, argon-purged waterproof 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\u003eThe 120° Apparent Field at 9mm\u003c\/h3\u003e\n\u003cp\u003eThe 9mm 120° is in a class by itself, with an apparent field unlike anything you have experienced before, and this widest field will submerge you in night sky views.\u003c\/p\u003e\n\u003cp\u003eWhile many hyper-wide eyepieces offer low magnification, the 9mm focal length provides a close-up, high-power view of your target. You see even more of the sky and also see the main attraction, whether a nebula, a galaxy or a star cluster, close up: the best of both worlds.\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\u003eOptical Design: 12 Elements in 8 Groups\u003c\/h3\u003e\n\u003cp\u003eThe eyepiece uses 12 lens elements in 8 groups. Explore Scientific does not publish more about its glass or coatings.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverted Vision Enhancement:\u003c\/strong\u003e Hyper-wide eyepieces make it easy to gaze slightly to the side of an object, which puts the image on a part of your eye that is more sensitive to light, allowing you to see fainter images.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized for Non-Driven Scopes:\u003c\/strong\u003e Objects stay in the field a long time, especially noticeable without a drive, as with a \u003ca href=\"\/collections\/dobsonians\"\u003eDobsonian\u003c\/a\u003e or a \u003ca href=\"\/collections\/refractors\"\u003erefractor\u003c\/a\u003e on a grab and go mount like the Explore Scientific Twilight I.\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 Waterproofing\u003c\/h3\u003e\n\u003cp\u003eThe 120° is built on the same waterproof eyepiece concept: O-ring sealed and purged with an inert gas to create a waterproof environment.\u003c\/p\u003e\n\u003cp\u003eThe eyepiece needs a 2-inch \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e. Like the rest of the waterproof series, it has a tapered 2\" barrel for extra security.\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 magnification does the 9mm give?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eDivide the telescope focal length by 9: about 67x at 600mm, 133x at 1200mm and 222x at 2000mm.\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 120° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eEach eyepiece is O-ring sealed and purged with an inert gas to create a waterproof environment, with a fog-proof housing.\u003c\/p\u003e\n\u003cul\u003e\n\u003c\/ul\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 120° 9mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eGood targets are nebulae, galaxies and star clusters, seen close up with plenty of surrounding sky.\u003c\/p\u003e\n\u003cul\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will an Explore Scientific Focal Extender affect the view with this 9mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003ca href=\"\/collections\/barlows-and-extenders\"\u003efocal extender\u003c\/a\u003e increases the magnification of any eyepiece with the same barrel size. The 2\" FE02-020 2x gives this eyepiece the magnification of a 4.5mm.\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 120° 9mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA 120° field at 9mm needs a field stop of roughly 9 × 120 \/ 57.3 ≈ 19mm, and the large optics behind it, so Explore Scientific builds it with a 2\" barrel.\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 a 100° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt the same magnification a 120° field is 20% wider than a 100° field. 120° is the widest apparent field Explore Scientific makes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow should I clean the waterproof Explore Scientific 120° 9mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBecause the eyepiece is sealed, only the outer lens surfaces need cleaning, and only when needed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich telescopes suit the 120° 9mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAny telescope with a 2\" focuser. The long time objects stay in view is especially noticeable without a drive, as with a Dobsonian or a refractor on the Explore Scientific Twilight I.\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\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e12 in 8 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e12.5 mm\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 120° 9mm 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\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\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 \u003ca href=\"\/collections\/refractors\"\u003erefractors\u003c\/a\u003e, it provides the high power needed to resolve fine details on Jupiter's cloud bands or Saturn's rings. In larger instruments like \u003ca href=\"\/collections\/schmidt-cassegrain-telescopes\"\u003eSchmidt-Cassegrains\u003c\/a\u003e or large \u003ca href=\"\/collections\/dobsonians\"\u003eDobsonians\u003c\/a\u003e, 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 \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eBarlow\u003c\/a\u003e 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\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e15mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e2.7mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e6 in 3 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e204.1 g\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\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":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\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 \u003ca href=\"\/collections\/focusers\"\u003efocusers\u003c\/a\u003e and \u003ca href=\"\/collections\/diagonals\"\u003ediagonal\u003c\/a\u003e 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 \u003ca href=\"\/collections\/dobsonians\"\u003eDobsonian\u003c\/a\u003e, 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 \"\u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e\" 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\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e16.6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e9.1mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e6 in 3 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e181.4 g\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\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":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\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° 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\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 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 \u003ca href=\"\/collections\/dobsonians\"\u003eDobsonian\u003c\/a\u003e (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\u003eThis eyepiece has 16.3mm of eye relief. 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\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    \u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e16.3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e15.9mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e6 in 3 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e206 g\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° 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\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":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 \u003ca href=\"\/collections\/binoviewers\"\u003ebinoviewers\u003c\/a\u003e, 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 \u003ca href=\"\/collections\/dobsonians\"\u003eDobsonian\u003c\/a\u003e 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 \"\u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e\" 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\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e15mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e18.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e5 in 3 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e181.4 g\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\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\u003c\/h3\u003e\n\u003cp\u003eWith a 52° apparent field, this eyepiece offers a comfortable, immersive window on the sky. 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 \u003ca href=\"\/collections\/binoviewers\"\u003ebinoviewer\u003c\/a\u003e. 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 flat-field design with 4 elements in 2 groups, the same element count as a Plössl. It offers exceptional quality, eye relief and value versus a comparably priced Plössl.\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 \u003ca href=\"\/collections\/dobsonians\"\u003eDobsonian\u003c\/a\u003e (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 \"\u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e\" 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 \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e or require significant \u003ca href=\"\/collections\/counterweights\"\u003ecounterweights\u003c\/a\u003e. 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\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e16.4mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e18.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e4 in 2 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter thread\u003c\/td\u003e\n\u003ctd\u003eM28.5x0.6 (1.25in filter)\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\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":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\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° 30mm uses a flat-field optical design with 4 elements in 2 groups. 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 shares the Plössl's element count (4 in 2 groups) but adds a flat field, 19.9mm of eye relief and a waterproof housing. 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 This series has excellent contrast, 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\u003e\u003ca href=\"\/collections\/schmidt-cassegrain-telescopes\"\u003eSchmidt-Cassegrains\u003c\/a\u003e (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 gives close to the widest view a 1.25-inch eyepiece can show. In a typical 2000mm SCT that is about 0.8°, enough for the core of the Andromeda Galaxy (M31) but not its full extent.\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 \u003ca href=\"\/collections\/refractors\"\u003erefractor\u003c\/a\u003e, this eyepiece will function as a \"\u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e\" 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\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e19.9mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e27.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e4 in 2 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e204.1 g\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\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty Policy\u003c\/a\u003e\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\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 a wide 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\u003eThe Explore Scientific 52° 40mm uses a flat-field optical design with 4 elements in 2 groups. 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 27.1mm of eye relief, the longest in the 52° Series. 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. They also offer longer eye relief (28.2mm and 31mm), so eyeglass wearers can use them too.\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\u003eIt is smaller and lighter: the 52° 40mm weighs 385.5 g and is 61.8mm wide, against 998 g and 80.3mm for the 68° 40mm. The 68° version offers a wider, more immersive field and slightly longer eye relief (31mm versus 27.1mm).\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\u003eExplore Scientific does not state a filter thread for the 52° 40mm, so confirm the fit before buying 2-inch filters for it.\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\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\u003c\/td\u003e\n\u003ctd\u003e52°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e27.1mm\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\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e36.3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e4 in 2 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e385.5 g\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° 40mm 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\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":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\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 \u003ca href=\"\/collections\/dobsonians\"\u003eDobsonian\u003c\/a\u003e (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\u003e15mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Elements\u003c\/td\u003e\n\u003ctd\u003e6 in 3 groups\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\u003ctr\u003e\n\u003ctd\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e4.1mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter thread\u003c\/td\u003e\n\u003ctd\u003eM28.5x0.6 (1.25in filter)\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\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":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\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 \u003ca href=\"\/collections\/schmidt-cassegrain-telescopes\"\u003eSchmidt-Cassegrain Telescope\u003c\/a\u003e (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) \u003ca href=\"\/collections\/refractors\"\u003erefractor\u003c\/a\u003e 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\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\u003c\/td\u003e\n\u003ctd\u003e52°\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\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e5.9mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e6 in 3 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e226.8 g\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° 6.5mm 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\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":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\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 \"\u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e\" eyepiece in \u003ca href=\"\/collections\/schmidt-cassegrain-telescopes\"\u003eSchmidt-Cassegrains\u003c\/a\u003e 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 \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eBarlow lens\u003c\/a\u003e 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. It has 15.3mm of eye relief; the 24mm, 28mm, 34mm and 40mm 68 deg models, with over 18mm of eye relief, are the ones perfect for eyeglass wearers. 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\u003e812257010530\u003c\/td\u003e\n\u003c\/tr\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\u003c\/td\u003e\n\u003ctd\u003e68°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e15.3mm\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\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e22.8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e6 in 4 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e247 g\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° 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\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":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 \u003ca href=\"\/collections\/schmidt-cassegrain-telescopes\"\u003eSchmidt-Cassegrain\u003c\/a\u003e 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 \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e 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\u003eExplore Scientific does not state a filter thread for the 68° 24mm, so confirm the fit before buying 1.25\" filters for it.\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\u003e812257010523\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e18.4mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e27.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e6 in 4 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e329 g\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° 24mm 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\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":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 \u003ca href=\"\/collections\/newtonian-telescopes\"\u003eNewtonians\u003c\/a\u003e. 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° 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 \u003ca href=\"\/collections\/dobsonians\"\u003eDobsonian\u003c\/a\u003e, 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\u003ctr\u003e\n\u003ctd\u003eEye relief\u003c\/td\u003e\n\u003ctd\u003e21.6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e31.8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e6 in 4 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e458 g\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° 28mm 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\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":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\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 \"\u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e\" 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 \u003ca href=\"\/collections\/schmidt-cassegrain-telescopes\"\u003eSchmidt-Cassegrain Telescope\u003c\/a\u003e, 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\u003e26.4mm\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\u003ctr\u003e\n\u003ctd\u003eField stop\u003c\/td\u003e\n\u003ctd\u003e38.6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ groups\u003c\/td\u003e\n\u003ctd\u003e6 in 4 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e685 g\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\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":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"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/collections\/Explore-Scientific-Logo.jpg?v=1683750660","url":"https:\/\/davidastro.com\/collections\/explore-scientific.oembed?page=9","provider":"David Astro","version":"1.0","type":"link"}