{"title":"Explore Scientific 68° Series Eyepieces","description":"\u003cp\u003eExplore Scientific 68° Series eyepieces give a wide 68° apparent field in a waterproof, argon-purged body. The 16mm, 20mm and 24mm models use 1.25\" barrels, and the 28mm, 34mm and 40mm are 2\" eyepieces for low magnification and the widest true field your telescope allows.\u003c\/p\u003e\u003cp\u003eThe series centers on medium and long focal lengths, so it pairs well with a shorter eyepiece for planets. It suits deep-sky observers framing open clusters, large nebulae and Milky Way star fields.\u003c\/p\u003e","products":[{"product_id":"explore-scientific-68-20mm-waterproof-eyepiece-1-25","title":"Explore Scientific 68° 20mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e20mm Focal Length\u003c\/li\u003e\n\u003cli\u003e68° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eArgon-Purged Waterproof Construction\u003c\/li\u003e\n\u003cli\u003eParfocal with other ES 68° Eyepieces\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific 68° 20mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 68° 20mm Waterproof Eyepiece delivers a wide 68° apparent field of view in a standard 1.25\" barrel format. Its 20mm focal length provides the medium-power magnification needed to frame larger deep-sky objects like the Lagoon Nebula (M8) or the Andromeda Galaxy (M31) while maintaining a bright, high-contrast image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 68° Immersive, Flat-Field View\u003c\/h3\u003e\n\u003cp\u003eEngineered with an advanced optical design, this eyepiece uses combinations of low-dispersion and high-refractive-index glasses to deliver sharp, high-resolution views. The 68° apparent field creates an immersive viewing window, while the optics are optimized to maintain a superior flat field, ensuring stars remain tight points from the center to the edge of the view.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Multi-Coatings:\u003c\/strong\u003e Every air-to-glass surface is treated with enhanced multilayer deposition coatings to maximize light transmission and contrast, darkening the sky background and making faint details pop.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImmersion Experience:\u003c\/strong\u003e The combination of a wide field and long eye relief provides a comfortable, spacious view that feels less like looking through an instrument and more like floating in space.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eArgon-Purged for Lifetime Waterproofing\u003c\/h3\u003e\n\u003cp\u003eUnlike standard eyepieces, the Explore Scientific 68° series is fully sealed and purged with inert Argon gas. This process makes the eyepiece completely waterproof, preventing internal fogging in high humidity and protecting the internal lens elements from dust, fungus, and cleaning solutions for the life of the product.\u003c\/p\u003e\n\u003cp\u003eArgon is chosen over the more common Nitrogen because its larger atomic structure is less prone to diffusing through seals over time. This ensures the dry, sealed environment remains pristine, protecting your investment and guaranteeing consistent, clear views regardless of observing conditions. Every eyepiece is factory-tested to be waterproof, withstanding full immersion without failure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eParfocal and Long Eye Relief Design\u003c\/h3\u003e\n\u003cp\u003eThe 20mm eyepiece is designed to be parfocal with other eyepieces in the Explore Scientific 68° series. This means you can switch between different focal lengths in the series with little to no refocusing, saving valuable observing time and making it easier to compare views at different magnifications.\u003c\/p\u003e\n\u003cp\u003eA generous amount of eye relief and a foldable, soft silicone rubber eyecup enhance observer comfort, which is critical during long nights at the telescope. This design allows you to relax your eye and see the entire 68° field with ease, a significant benefit for observers who wear eyeglasses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eChoosing Your Focal Length: 20mm vs. 24mm in the 68° Series\u003c\/h3\u003e\n\u003cp\u003eWithin the 1.25\" 68° series, the 20mm and 24mm focal lengths serve different primary purposes. The best choice depends on your telescope and typical targets.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eES 68° 24mm:\u003c\/strong\u003e This eyepiece delivers a wider true field of view and lower magnification. It excels as a \"finder\" eyepiece in Schmidt-Cassegrains and is ideal for framing the largest nebulae and star clusters, like the Pleiades (M45).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eES 68° 20mm:\u003c\/strong\u003e The 20mm provides more magnification, darkening the sky background and increasing image scale. This makes it better for resolving detail in medium-sized objects, such as the Hercules Cluster (M13) or the Dumbbell Nebula (M27), without sacrificing too much field of view.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"Argon-purged\" mean for the Explore Scientific 68° 20mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eArgon-purging\u003c\/strong\u003e means the air inside the eyepiece has been replaced with dry, inert argon gas and then sealed. This makes the Explore Scientific 68° 20mm eyepiece completely waterproof and prevents internal fogging, dust intrusion, and the growth of fungus on the lenses. It ensures the eyepiece performs reliably in any weather condition and lasts a lifetime.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Explore Scientific 68° 20mm perform on the Orion Nebula (M42) in an 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 8\" f\/10 SCT (2032mm focal length), the ES 68° 20mm eyepiece provides 102x magnification. This is an excellent power for framing the entire Orion Nebula (M42), from the bright Trapezium star cluster at its core to the faint, sweeping outer arms. The 68° field will feel immersive and provide a dark sky background to enhance nebulosity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 20mm focal length good for planetary viewing with the ES 68° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 20mm focal length provides medium power, which is great for locating planets and viewing them in context with their moons, such as Jupiter and the Galilean satellites. For detailed observation of planetary features like Jupiter's Great Red Spot or Saturn's Cassini Division, you would typically use a much shorter focal length eyepiece (e.g., 6mm to 9mm) or a Barlow lens with the 20mm eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of a \"parfocal\" eyepiece like the ES 68° 20mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003eparfocal eyepiece\u003c\/strong\u003e requires little to no refocusing when swapped with other eyepieces in the same series. The main benefit is speed and convenience. When you switch from the 20mm to another ES 68° eyepiece, your target will snap back into focus almost instantly, saving you from having to hunt for focus in the dark.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need to wear my glasses with the Explore Scientific 68° 20mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Explore Scientific 68° 20mm features long eye relief, which allows you to hold your eye at a comfortable distance from the lens and still see the entire field of view. This design is ideal for observers who wear glasses to correct for astigmatism. For those who don't, the included foldable rubber eyecup helps maintain the correct eye position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 68° 20mm eyepiece a good all-around choice?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, for many telescopes, a 20mm focal length is an excellent workhorse for deep-sky observing. It provides enough magnification to resolve details in many galaxies and nebulae while still offering a wide enough true field of view to easily locate objects. It's a versatile choice that bridges the gap between low-power scanning and high-power planetary viewing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e8122570105304\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967200522525,"sku":"ES-EPWP6820-01","price":153.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-68-deg-20mm-Waterproof-Eyepiece-EPWP6820-01-1__68888.1594240354.1280.1280.jpg?v=1684338866"},{"product_id":"explore-scientific-68-24mm-waterproof-eyepiece-1-25","title":"Explore Scientific 68° 24mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e24mm Focal Length\u003c\/li\u003e\n\u003cli\u003e68° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eArgon-Purged Waterproof Construction\u003c\/li\u003e\n\u003cli\u003eParfocal with 68° Series Eyepieces\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific 68° 24mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 68° 24mm Waterproof Eyepiece delivers an immersive 68° apparent field of view in a rugged, all-weather 1.25\" format. Its 24mm focal length provides a versatile medium-low power that is ideal for framing large deep-sky objects, while its advanced optical design maintains high contrast and a flat field from edge to edge. By sealing the optical housing with inert Argon gas, this eyepiece guarantees protection against internal fogging, dust, and moisture, ensuring consistent views regardless of observing conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 24mm 68° Full-Immersion Experience\u003c\/h3\u003e\n\u003cp\u003eWith a 68° apparent field, this eyepiece provides a viewing window that feels expansive and immersive, a significant step up from standard Plössl designs. The 24mm focal length hits a sweet spot for many telescopes, offering wide true fields of view perfect for locating objects and observing large star clusters like the Pleiades (M45) or extended nebulae like the Orion Nebula (M42). Using low dispersion and high refractive index glasses, the design is optimized to produce sharp, high-resolution images across a superiorly flat field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eArgon-Purged: A 100% Waterproof Optical Chamber\u003c\/h3\u003e\n\u003cp\u003eThe defining feature of this eyepiece is its sealed, Argon-purged body. Unlike nitrogen-purged optics, Argon's larger atoms are less prone to diffusing through seals over time, offering superior long-term protection. This process creates a dry, inert internal environment that completely prevents internal fogging during rapid temperature drops and stops the growth of fungus or the intrusion of fine dust. The trade-off for this durability is that the eyepiece is not user-serviceable, but the benefit is pristine internal elements that are protected for the life of the instrument.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eParfocal Design for Seamless Magnification Changes\u003c\/h3\u003e\n\u003cp\u003eAs part of the Explore Scientific 68° Series, this 24mm eyepiece is parfocal with its siblings. This means that when you switch between different focal lengths in the series, the focus point remains nearly identical, requiring little to no adjustment. This is a critical time-saver in the field, allowing you to change magnification to study different details of an object without losing focus and having to start over. The eyepiece also features long eye relief and a foldable rubber eyecup, enhancing comfort for all observers, including those who wear glasses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eExplore Scientific 24mm 68° vs. Tele Vue 24mm Panoptic\u003c\/h3\u003e\n\u003cp\u003eThe most common comparison for this eyepiece is the Tele Vue 24mm Panoptic, which is often considered the benchmark in this class.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTele Vue 24mm Panoptic:\u003c\/strong\u003e The Panoptic is renowned for its exceptional edge-to-edge sharpness and contrast. It is lighter than the Explore Scientific model and sets the standard for optical correction in a 68° eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific 24mm 68°:\u003c\/strong\u003e This eyepiece offers a directly comparable 68° field of view and excellent optical characteristics at a competitive price. Its key advantage is the Argon-purged waterproof construction, making it the superior choice for observers in humid or dew-prone climates, or for anyone prioritizing ruggedness and environmental durability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the Explore Scientific 24mm 68° eyepiece \"waterproof\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe eyepiece body is fully sealed and purged with inert \u003cstrong\u003eArgon gas\u003c\/strong\u003e. This dry gas replaces normal air, preventing moisture from ever entering the optical housing. This makes it impervious to internal fogging, humidity, and contaminants like dust or fungus, ensuring the internal lenses remain clean indefinitely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Explore Scientific 24mm 68° perform in an 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 8\" f\/10 Schmidt-Cassegrain with a 2032mm focal length, the Explore Scientific 24mm 68° eyepiece will provide \u003cstrong\u003e85x magnification\u003c\/strong\u003e and a true field of view of approximately 0.8°. This is an excellent magnification for framing the entire Andromeda Galaxy (M31), viewing the full extent of the Dumbbell Nebula (M27), or resolving globular clusters like the Hercules Cluster (M13).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 24mm 68° a good choice for viewing large open clusters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an ideal choice. The combination of a wide 68° apparent field and a 24mm focal length is perfect for framing large open clusters. In most telescopes, it will allow you to see objects like the Beehive Cluster (M44) or the Pleiades (M45) in their entirety within a single, sharp field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"parfocal\" mean for the Explore Scientific 68° eyepiece series?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eParfocal\u003c\/strong\u003e means that all eyepieces in the Explore Scientific 68° series share a nearly identical focal plane. When you swap from the 24mm to another eyepiece in the series (e.g., the 16mm or 34mm), your telescope will remain in focus. This saves significant time and effort, as you won't need to make major adjustments to the focuser each time you change magnification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Explore Scientific 24mm 68° compare to a standard 25mm Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Explore Scientific 24mm 68° eyepiece offers a dramatically wider and more immersive view. A standard Plössl has an apparent field of view around 50°-52°, while the 68° field of this eyepiece feels like looking out of a window rather than through a tunnel. It also features superior optical coatings and the significant advantage of being waterproof.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 1.25\" filters with the Explore Scientific 24mm 68° eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 1.25\" barrel of the Explore Scientific 24mm 68° eyepiece is threaded to accept standard 1.25\" astronomy filters, such as moon filters, light pollution filters, or nebula filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e24mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e68°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eArgon-Purged, Waterproof\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries Feature\u003c\/td\u003e\n\u003ctd\u003eParfocal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e8122570105236\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967200555293,"sku":"ES-EPWP6824-01","price":153.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-68-deg-24mm-Waterproof-Eyepiece-EPWP6824-01-1__76659.1647796027.1280.1280.jpg?v=1684338869"},{"product_id":"explore-scientific-68-28mm-waterproof-eyepiece-2","title":"Explore Scientific 68° 28mm Waterproof Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e28mm Focal Length\u003c\/li\u003e\n\u003cli\u003e68° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eArgon-Purged Waterproof Construction\u003c\/li\u003e\n\u003cli\u003eLong Eye Relief with Foldable Eyecup\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific 68° 28mm Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 68° 28mm eyepiece delivers a wide, immersive viewing experience in a rugged, fully waterproof 2\" barrel design. Its 28mm focal length provides low-to-medium power views ideal for scanning star fields, while the 68° apparent field of view feels expansive without being overly demanding on telescope optics.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 68° Flat-Field Window on the Sky\u003c\/h3\u003e\n\u003cp\u003eUsing a combination of low-dispersion and high-refractive-index glasses, this 28mm eyepiece is optimized for high contrast and resolution across its entire 68° apparent field. The result is a superior flat field, keeping stars sharp from the center to the edge, a critical feature when observing dense open clusters or extended nebulae.\u003c\/p\u003e\n\u003cp\u003eThe multi-layer coatings on all air-to-glass surfaces maximize light transmission, ensuring that the faintest stars and subtle details in galaxies are not lost. This optical design makes the eyepiece a versatile workhorse for everything from sweeping the Milky Way to framing large targets like the Andromeda Galaxy (M31).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eArgon-Purged for a Lifetime of Clarity\u003c\/h3\u003e\n\u003cp\u003eExplore Scientific seals this eyepiece and purges the internal volume with inert argon gas, making it completely waterproof and internally fog-proof. To ensure this seal, every eyepiece is tested by submerging it in one meter of water for 30 minutes. This process prevents the growth of internal fungus and protects the coatings from contaminants over the lifetime of the eyepiece.\u003c\/p\u003e\n\u003cp\u003eArgon is chosen over nitrogen for its larger atomic size, making it less likely to leak through seals over time. Its superior inertness also prevents chemical reactions with internal components, extending longevity and ensuring the optics remain as pristine as the day they were assembled, regardless of dew, humidity, or rapid temperature drops.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eLong Eye Relief and Parfocal Convenience\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece features long eye relief, providing comfortable views for all observers, including those who wear glasses. A soft, foldable silicone rubber eyecup allows you to set the perfect eye distance to see the full field of view while blocking stray light, which is critical for detecting faint details at the limit of vision.\u003c\/p\u003e\n\u003cp\u003eAs part of an integrated eyepiece series, the 68° 28mm is designed to be nearly parfocal with other eyepieces in the line. This minimizes the amount of refocusing needed when switching between different focal lengths, saving valuable observing time and making comparisons between views much more efficient.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eES 68° 28mm vs. the 82° Series: Field of View and Eye Placement\u003c\/h3\u003e\n\u003cp\u003eWhile the Explore Scientific 82° series offers a more expansive \"spacewalk\" effect, the 68° series presents a different set of advantages. The primary trade-off is the apparent field of view against eye comfort and optical tolerance.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific 82° Series Advantage:\u003c\/strong\u003e The wider 82° field provides a more immersive sensation and can fit slightly larger objects into the view at a similar magnification. It is often the choice for observers prioritizing the widest possible apparent field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific 68° 28mm Advantage:\u003c\/strong\u003e The 68° field is significantly less demanding on telescope optics, showing better edge-of-field performance in fast Newtonians. It also typically features more comfortable eye relief, making it easier to hold the full field of view, especially for eyeglass wearers or those new to wide-field eyepieces.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is Argon purging important for the ES 68° 28mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eArgon purging\u003c\/strong\u003e makes the eyepiece fully waterproof and internally fog-proof. This protects the delicate internal lens elements and coatings from moisture, fungus, and dust for the life of the eyepiece. Because Argon atoms are larger than Nitrogen, they are less likely to escape the seals over time, ensuring a superior, long-lasting dry environment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 68° 28mm eyepiece parfocal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this eyepiece is designed to be nearly \u003cstrong\u003eparfocal\u003c\/strong\u003e with other eyepieces in the Explore Scientific 68° and 62° series. This means you will only need to make minimal focus adjustments when switching between different focal lengths in the series, which is a significant convenience during an observing session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the ES 68° 28mm perform for finding galaxies like M81 and M82 in an 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 8\" f\/10 SCT with a 2032mm focal length, the 28mm eyepiece yields 72.5x magnification and a true field of view of just under 1 degree. This is an ideal magnification and field size for framing both Bode's Galaxy (M81) and the Cigar Galaxy (M82) together, making it an excellent eyepiece for locating and observing galaxy groups.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ES 68° 28mm a good choice for large open clusters like the Pleiades (M45) in a fast Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent choice. In a 10\" f\/4.7 Dobsonian, the 28mm eyepiece provides 43x magnification and a wide true field of view. The 68° apparent field is also less demanding on the fast optics compared to an 82° or 100° eyepiece, resulting in sharper stars across the field, which is critical for appreciating the beauty of large clusters like the Pleiades (M45).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI don't wear glasses. Will the long eye relief of the ES 68° 28mm be a problem?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe long eye relief is beneficial for everyone, not just eyeglass wearers. To manage the distance, the eyepiece includes a \u003cstrong\u003efoldable rubber eyecup\u003c\/strong\u003e. By extending the eyecup, you can comfortably rest your eye at the correct distance to see the entire 68° field without experiencing blackouts or \"kidney-beaning.\"\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main benefit of a 68° field of view in the 28mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 68° apparent field of view provides a significant immersive upgrade over standard Plössl (50°) or Kellner eyepieces without the bulk, weight, and optical demands of 82° or 100° designs. It strikes a balance, offering a wide, comfortable window on the sky that performs well in a wide variety of telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e28mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e68°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eYes, Argon-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257010516\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967200588061,"sku":"ES-EPWP6828-01","price":237.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-68-deg-28mm-Waterproof-Eyepiece-EPWP6828-01-1__36888.1594240355.1280.1280.jpg?v=1684338872"},{"product_id":"explore-scientific-68-34mm-waterproof-eyepiece-2","title":"Explore Scientific 68° 34mm Waterproof Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e34mm Focal Length\u003c\/li\u003e\n\u003cli\u003e68° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" Diameter Barrel\u003c\/li\u003e\n\u003cli\u003eArgon-Purged Waterproof Construction\u003c\/li\u003e\n\u003cli\u003eParfocal with other 68° Series Eyepieces\u003c\/li\u003e\n\u003cli\u003eLong Eye Relief for Eyeglass Wearers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific 68° 34mm Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 68° 34mm Waterproof Eyepiece delivers an immersive, wide-field view in a 2-inch barrel format. With a 34mm focal length, this eyepiece provides low-power, expansive views of the sky, framed within a generous 68° apparent field of view. Its fully sealed, Argon-purged body is tested to be waterproof at a depth of 1 meter for 30 minutes, ensuring it remains internally pristine regardless of observing conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 68° Immersive Field in a 34mm Focal Length\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece is engineered to produce a wide, flat, and high-contrast window into the cosmos. The 34mm focal length yields very low magnification, making it an ideal \"finder\" eyepiece for locating faint targets and an exceptional instrument for observing large-scale objects. The 68° apparent field of view is wide enough to frame the entirety of the Andromeda Galaxy (M31) or the Veil Nebula complex in most long-focal-length telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eArgon-Purged: Waterproof to 1 Meter for 30 Minutes\u003c\/h3\u003e\n\u003cp\u003eDew and humidity are constant challenges in astronomy, but this eyepiece is built to withstand them. The optical housing is purged of all air and filled with inert Argon gas before being sealed. This process makes the eyepiece impervious to internal fogging, fungus growth, and contaminants, and it has been factory-tested by submersion in 1 meter of water for 30 minutes. The dry, sealed environment means you can move from a warm house to a cold field without fear of internal condensation clouding your view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eParfocal Design and Long Eye Relief for Observer Comfort\u003c\/h3\u003e\n\u003cp\u003ePracticality is central to the 68° Series design. This 34mm model is parfocal with its siblings, meaning you can swap between different focal lengths in the series with little to no refocusing required. It also features long eye relief and a soft, foldable silicone eyecup, providing comfortable views for all observers, including those who must wear eyeglasses to correct for astigmatism.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eES 68° 34mm vs. ES 82° 30mm: Field of View vs. Eye Relief\u003c\/h3\u003e\n\u003cp\u003eWhen choosing a low-power eyepiece, a common comparison is between the 68° series and the wider 82° series. While the 82° eyepieces offer a more expansive \"spacewalk\" apparent field, the 68° series provides a critical advantage in observer comfort.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEye Relief:\u003c\/strong\u003e The 68° 34mm eyepiece has significantly longer eye relief, making it a superior choice for observers who wear glasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrue Field:\u003c\/strong\u003e Despite the smaller apparent field, the longer 34mm focal length means the true field of view is very comparable to a 30mm 82° eyepiece. You are not sacrificing much sky.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImmersion vs. Comfort:\u003c\/strong\u003e The choice comes down to priorities. The 82° series offers maximum immersion, while the 68° series provides a more relaxed, comfortable view without giving up the wide-field experience.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the Explore Scientific 68° 34mm eyepiece \"waterproof\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe eyepiece is fully sealed and purged with inert \u003cstrong\u003eArgon gas\u003c\/strong\u003e. This dry, pressurized environment prevents moisture, dew, and dust from ever entering the optical housing. Explore Scientific tests each eyepiece by submerging it in 1 meter of water for 30 minutes to guarantee the integrity of the seals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the ES 68° 34mm perform for finding objects in an f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt excels in this role. In a typical 8-inch f\/10 Schmidt-Cassegrain Telescope, the 34mm focal length provides a low magnification (around 60x) and a wide true field of view. This makes it much easier to star-hop and locate faint deep-sky objects compared to higher-power eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does it mean for the ES 68° 34mm eyepiece to be \"parfocal\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBeing \u003cstrong\u003eparfocal\u003c\/strong\u003e means this eyepiece shares a common focal plane with other eyepieces in the Explore Scientific 68° series. When you switch from one 68° eyepiece to another, the image will remain nearly in focus, requiring only a minimal adjustment. This saves significant time and effort during an observing session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 34mm focal length of this ES 68° eyepiece a good choice for viewing large objects like the Pleiades (M45)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent choice. The 34mm focal length is designed to provide a wide true field of view that can easily frame large open star clusters like the Pleiades (M45) or sprawling emission nebulae like the North American Nebula (NGC 7000) in a single view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eShould I choose this 68° 34mm eyepiece or an 82° series eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eChoose the \u003cstrong\u003e68° 34mm\u003c\/strong\u003e if you prioritize observer comfort, especially if you wear eyeglasses, as it offers longer eye relief. Choose an 82° eyepiece if your top priority is the most immersive, \"spacewalk\" viewing experience possible and you do not require long eye relief.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the eye relief on the Explore Scientific 68° 34mm sufficient for eyeglass wearers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Explore Scientific 68° series is known for its \u003cstrong\u003elong eye relief\u003c\/strong\u003e. This allows observers who need to wear glasses for astigmatism correction to see the entire 68° field of view comfortably without having to press their glasses against the lens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e34mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e68°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eYes, Argon-Purged (Tested to 1 meter for 30 minutes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParfocal\u003c\/td\u003e\n\u003ctd\u003eYes (with ES 68° Series)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003eLong\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257010509\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eExplore Scientific 68° 34mm Waterproof Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967200620829,"sku":"ES-EPWP6834-01","price":307.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-68-deg-34mm-Waterproof-Eyepiece-EPWP6834-01-1__90379.1594240355.1280.1280.jpg?v=1684338875"},{"product_id":"explore-scientific-68-40mm-waterproof-eyepiece-2","title":"Explore Scientific 68° 40mm Waterproof Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e40mm Focal Length\u003c\/li\u003e\n\u003cli\u003e68° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eArgon-Purged Waterproof Construction\u003c\/li\u003e\n\u003cli\u003eLong Eye Relief for Eyeglass Wearers\u003c\/li\u003e\n\u003cli\u003eParfocal with other Explore Scientific 68° Eyepieces\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eExplore Scientific 68° 40mm Waterproof Eyepiece - 2\"\u003c\/h2\u003e\n      \u003cp\u003eThe Explore Scientific 68° 40mm Waterproof Eyepiece delivers a fully immersive 68° apparent field of view in a 2-inch barrel, designed for sweeping low-power views of the deep sky. Its argon-purged body is waterproof-tested for 30 minutes at a depth of one meter, ensuring complete protection from dew, humidity, and accidental exposure to the elements.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eThe 40mm, 68° Wide-Field View: Maximum Context in a 2\" Barrel\u003c\/h3\u003e\n      \u003cp\u003eWith a 40mm focal length, this eyepiece provides very low magnification, making it an ideal tool for locating objects and framing the largest deep-sky targets. The expansive 68° apparent field of view creates a \"spacewalk\" experience, allowing you to see large structures like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000) in their entirety within many long-focal-length telescopes.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eArgon-Purged \u0026amp; Waterproof: Sealed for 30 Minutes at 1 Meter\u003c\/h3\u003e\n      \u003cp\u003eBy purging the optical housing with inert argon gas, Explore Scientific prevents the growth of internal fungus and eliminates fogging during nights with heavy dew. Unlike nitrogen, the larger argon atoms are less likely to leak through seals over time, ensuring the eyepiece remains pristine for years. This sealed environment means you can clean the eyepiece without risk of solvents seeping between lens elements, a critical feature for maintaining optical contrast.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eTested Immersion:\u003c\/strong\u003e Every eyepiece is tested to be waterproof for 30 minutes in one meter of water, guaranteeing performance in any observing condition.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eInert Environment:\u003c\/strong\u003e The argon-purged interior protects delicate multi-coatings from degradation caused by moisture and contaminants.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eThermal Stability:\u003c\/strong\u003e Argon's lower thermal conductivity helps buffer the optics against rapid temperature drops, reducing the risk of thermal shock.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eParfocal Design \u0026amp; Long Eye Relief: A Focus on Observer Comfort\u003c\/h3\u003e\n      \u003cp\u003eThis eyepiece features long eye relief and a soft, foldable silicone eyecup, making it comfortable for all observers, including those who wear eyeglasses. It is also parfocal with other eyepieces in the Explore Scientific 68° series, meaning you can switch between different magnifications with little to no refocusing required. This convenience saves valuable time at the telescope, keeping your target sharp as you change your view.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eExplore Scientific 40mm 68° vs. TeleVue 55mm Plössl: Apparent vs. True Field\u003c\/h3\u003e\n      \u003cp\u003eWhen choosing a low-power 2\" eyepiece, it's critical to understand the trade-offs between apparent field of view (AFOV) and true field of view (TFOV).\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eTeleVue 55mm Plössl's Advantage:\u003c\/strong\u003e The 55mm Plössl is designed to produce the widest possible TFOV in a 2\" barrel. It's the ultimate \"finder\" eyepiece, showing the largest possible patch of sky at the lowest magnification, but with a narrower 50° AFOV.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eExplore Scientific 40mm's Advantage:\u003c\/strong\u003e The ES 40mm prioritizes an immersive viewing experience with its wide 68° AFOV. While its TFOV is slightly smaller than the 55mm Plössl's, the \"picture window\" effect is much more pronounced. Additionally, its waterproof construction offers a level of environmental protection the Plössl does not.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy choose the Explore Scientific 40mm 68° eyepiece for an f\/10 SCT?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIn a typical 8\" f\/10 Schmidt-Cassegrain Telescope, the Explore Scientific 40mm 68° eyepiece yields 50x magnification and a true field of over 1.3 degrees—wide enough to frame the entire Pleiades star cluster (M45). It effectively turns the narrow field of an SCT into a rich-field instrument for sweeping the Milky Way.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the waterproofing on the Explore Scientific 40mm 68° help during a dewy night?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe primary benefit is the prevention of \u003cstrong\u003einternal fogging\u003c\/strong\u003e. On humid nights, temperature changes can cause moisture to condense on interior lens surfaces of unsealed eyepieces, rendering them useless until they dry out. The argon-purged, sealed body of the Explore Scientific 40mm 68° eyepiece completely prevents this, ensuring a clear view all night long.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 40mm 68° good for framing large objects like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, this is an excellent choice for that purpose. In many amateur telescopes with focal lengths from 1000mm to 2000mm, the Explore Scientific 40mm 68° eyepiece provides a field of view wide enough to capture the Andromeda Galaxy (M31) and its satellite galaxies M32 and M110 in a single, immersive view.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"parfocal\" mean for the Explore Scientific 40mm 68° eyepiece?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cstrong\u003eParfocal\u003c\/strong\u003e means that this eyepiece requires little to no refocusing when swapped with other eyepieces in the same Explore Scientific 68° series. This is a significant convenience, as it allows you to change magnifications quickly without losing focus on your target, which is especially useful when tracking moving objects or sharing views at a star party.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need an extension tube to reach focus with the Explore Scientific 40mm 68° eyepiece?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIt depends on your telescope's focuser travel. Long focal length eyepieces like this 40mm model sometimes require more \"out-travel\" than some focusers provide. If you cannot reach focus, a simple 2\" barrel extender is all that is needed to move the eyepiece to the correct focal plane.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 68° field of view in the Explore Scientific 40mm eyepiece compare to a standard Plössl?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eA standard Plössl eyepiece has an apparent field of view around 50°-52°. The 68° field of the Explore Scientific eyepiece feels significantly wider and more immersive, providing a \"picture window\" view of the sky rather than looking through a narrow tube. This makes navigating among the stars and observing large nebulae a more engaging experience.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e40mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e68°\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eArgon-Purged, Waterproof\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257010493\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967200653597,"sku":"ES-EPWP6840-01","price":433.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-68-deg-40mm-Waterproof-Eyepiece-EPWP6840-01-1__53001.1594240356.1280.1280.jpg?v=1684338878"},{"product_id":"explore-scientific-68-16mm-waterproof-eyepiece-1-25","title":"Explore Scientific 68° 16mm Waterproof Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e16mm Focal Length\u003c\/li\u003e\n\u003cli\u003e68° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eWaterproof \u0026amp; Argon-Purged\u003c\/li\u003e\n\u003cli\u003eParfocal with 68° Series Eyepieces\u003c\/li\u003e\n\u003cli\u003eLong Eye Relief\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific 68° 16mm Waterproof Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 68° 16mm Waterproof Eyepiece delivers an immersive, wide-field view in a rugged, fully-sealed 1.25\" barrel. Its 16mm focal length provides useful magnification for resolving details in celestial objects, framed by a generous 68° apparent field of view. This eyepiece is fully Argon-purged, making it impervious to internal fogging or contaminants regardless of observing conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e16mm Focal Length in a 68° Flat-Field Design\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece's optical design is optimized to produce high-contrast, high-resolution images across its entire 68° apparent field. By using combinations of low-dispersion and high-refractive-index glasses with durable multi-layer coatings, stars remain sharp, point-like sources from the center to the edge of the field stop. The 16mm focal length hits a sweet spot, providing enough power to resolve individual stars in globular clusters while keeping the field wide enough to frame many nebulae and galaxies in their entirety.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eArgon-Purged Waterproofing in a 1.25\" Body\u003c\/h3\u003e\n\u003cp\u003eUnlike standard eyepieces, this 68° series model is environmentally sealed and purged with inert Argon gas. This process makes the eyepiece completely waterproof, preventing internal fogging during sudden temperature drops and protecting the optics from dust, moisture, and fungus for the life of the instrument. Argon provides superior long-term protection over Nitrogen because its larger atoms are less likely to escape through seals over time, ensuring the internal elements remain pristine.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 68° Series Parfocal System: Seamless Magnification Changes\u003c\/h3\u003e\n\u003cp\u003eThe Explore Scientific 68° Series eyepieces are designed to be parfocal, meaning they all reach focus at nearly the same point. When you switch from this 16mm eyepiece to another focal length in the series, you'll only need a minimal, if any, turn of the focus knob. This saves valuable time at the telescope, keeping your target sharp and centered as you change magnification.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong Eye Relief:\u003c\/strong\u003e Generous eye relief allows for comfortable viewing, reducing eye strain during long observing sessions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFold-Down Eyecup:\u003c\/strong\u003e A soft, foldable silicone rubber eyecup shields your eye from stray light and can be adjusted for use with or without eyeglasses.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 16mm Sweet Spot: Framing Globular Clusters and Nebulae\u003c\/h3\u003e\n\u003cp\u003eIn the 68° series, the 16mm focal length serves as a crucial workhorse for deep-sky observing. While a longer focal length eyepiece like a 24mm or 34mm is ideal for locating objects, the 16mm provides the next step up in power needed to resolve structure. In a typical 8-inch f\/10 SCT, this eyepiece yields 127x magnification, perfect for darkening the sky background and making faint details pop in objects like the Hercules Cluster (M13) or the Ring Nebula (M57).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the Explore Scientific 16mm 68° eyepiece being Argon-purged?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is \u003cstrong\u003etotal environmental protection\u003c\/strong\u003e. The Argon-purged and sealed body prevents internal fogging when moving from a warm house to a cold outdoor environment. It also permanently blocks dust, pollen, and moisture from getting between the lenses, eliminating the risk of internal fungus growth and ensuring the optics remain clean for life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 16mm focal length of this 68° eyepiece perform on planetary nebulae like the Ring Nebula (M57)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 16mm focal length is excellent for objects like the Ring Nebula (M57). In most telescopes, it provides enough magnification to clearly resolve M57's iconic smoke-ring shape while the 68° field of view provides a wide, dark backdrop that makes the nebula stand out. It offers a significant advantage over lower-power eyepieces that might show the nebula as just a small, fuzzy star.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 16mm 68° eyepiece suitable for observers who wear glasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. This eyepiece features \u003cstrong\u003elong eye relief\u003c\/strong\u003e, which means you can hold your eye at a comfortable distance from the lens and still see the entire 68° field of view. The soft silicone eyecup can also be folded down to provide a better fit for eyeglass wearers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does it mean that the Explore Scientific 16mm 68° eyepiece is 'parfocal'?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eParfocal\u003c\/strong\u003e means that this eyepiece will stay in focus when you switch it with other eyepieces from the same Explore Scientific 68° series. This is a significant convenience, as it minimizes the need to make large adjustments to your telescope's focuser each time you change magnification, saving you time and keeping your target centered.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 16mm eyepiece work well in my 8\" f\/10 Schmidt-Cassegrain telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. In an 8\" f\/10 SCT with a 2032mm focal length, this 16mm eyepiece provides 127x magnification. This is an ideal medium-high power for resolving globular clusters, viewing details in brighter nebulae, and studying lunar features. The 68° field will provide a true field of view of about half a degree, enough to frame the entire Orion Nebula (M42) sword region.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 68° field of view on this 16mm eyepiece compare to a standard 52° Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 68° apparent field of view feels significantly more immersive, like looking through a porthole rather than a narrow tube. While both eyepieces would provide the same magnification, the 68° eyepiece shows a much wider area of the surrounding sky, making it easier to appreciate the context of celestial objects and providing a more engaging \"spacewalk\" experience.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e16mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e68°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eYes, Argon-Purged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParfocal\u003c\/td\u003e\n\u003ctd\u003eYes, with 68° Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e8122570105472\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eExplore Scientific 68° 16mm Waterproof Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNo manual or software is available for this product.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44968076476701,"sku":"ES-EPWP6816-01","price":153.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-68-16mm__95451.1681244116.1280.1280.jpg?v=1684348756"}],"url":"https:\/\/davidastro.com\/en-us\/collections\/explore-scientific-68-series-eyepieces.oembed","provider":"David Astro","version":"1.0","type":"link"}