{"title":"TeleVue Ethos 100° and 110° Eyepieces","description":"\u003cp\u003eTeleVue Ethos eyepieces deliver a 100° apparent field of view, and the Ethos-SX models push it to 110°, for an immersive, edge-to-edge sharp view through the telescope.\u003c\/p\u003e\u003cp\u003eThe range includes 6mm, 8mm, 10mm and 13mm models with dual 1.25\"\/2\" barrels, 17mm and 21mm in 2\", and the Ethos-SX 3.7mm and 4.7mm for high power. A dedicated Ethos carry bag protects these large eyepieces.\u003c\/p\u003e","products":[{"product_id":"televue-ethos-21mm-100-eyepiece","title":"TeleVue Ethos 21mm 100° Eyepiece - 2\"","description":"\u003c!-- short description --\u003e\n\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e21mm Focal Length\u003c\/li\u003e\n\u003cli\u003e100° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" Barrel\u003c\/li\u003e\n\u003cli\u003e15mm Eye Relief\u003c\/li\u003e\n\u003cli\u003e36.2mm Field Stop\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!-- tabs --\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\u003c!-- Title image text --\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003c!-- Main Image --\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eTeleVue Ethos 21mm 100° Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Ethos 21mm eyepiece represents the ultimate evolution in wide field visual astronomy. Since its debut, the Ethos line has redefined the spacewalk experience, but the 21mm focal length stands alone as the series most powerful tool for deep sky exploration. By combining a staggering 100° apparent field of view (AFOV) with a focal length that balances magnification and exit pupil, Tele Vue has created an optical masterpiece that functions as several eyepieces in one.\u003c\/p\u003e\n\u003cp\u003eWhen you peer through the Ethos 21mm, the boundaries of the equipment disappear. You are no longer looking at a circular image through a tube; instead, it creates a true spacewalk effect with no visible field stop. This is the eyepiece for the observer who demands the absolute best correction, the highest contrast, and a field of view so expansive it challenges the limits of human peripheral vision.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Title image text --\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003c!-- Main Image --\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eRedefining the 100° Apparent Field of View\u003c\/h3\u003e\n\u003cp\u003eThe defining characteristic of the Ethos 21mm is its 100° apparent field of view. To put this in perspective, this provides over 50% more viewing area than an 82° Nagler and nearly triple the area of a standard 68° wide-field eyepiece.\u003c\/p\u003e\n\u003cp\u003eIn real-world use, this gargantuan field serves a dual purpose. First, it allows for incredible find and view capabilities. In many telescopes, the 21mm Ethos delivers a true field of view nearly as wide as a low-power 35mm Panoptic or a 31mm Nagler, but at significantly higher magnification. This means you can locate a faint galaxy and observe its structural details immediately without switching eyepieces.\u003c\/p\u003e\n\u003cp\u003eSecondly, the 100° field creates an emotional impact that narrower eyepieces cannot replicate. On large nebulae like the Orion Nebula (M42) or the North American Nebula (NGC 7000), the Ethos 21mm captures the entire complex while simultaneously providing the power needed to darken the sky background and reveal delicate filaments of gas.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Title image text --\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003c!-- Main Image --\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUnmatched Optical Performance and Correction\u003c\/h3\u003e\n\u003cp\u003eTele Vue eyepieces are world-renowned for their on-axis sharpness, but the Ethos 21mm extends that perfection across the entire 100° field. Designed by Paul Dellechiaie under the guidance of Al Nagler, the Ethos optical train is engineered to eliminate the common pitfalls of ultra-wide designs.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEdge Correction:\u003c\/strong\u003e Even in fast telescopes with focal ratios of f\/5 or f\/4, the Ethos 21mm maintains pinpoint star images from the center to the very edge of the field stop.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContrast and Baffling:\u003c\/strong\u003e Every internal lens edge is blackened, and the multi-coatings are specifically tuned to the glass types used. This results in inky black backgrounds and the total absence of ghosting or internal reflections, even when observing near a bright Moon or planet.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor Fidelity:\u003c\/strong\u003e The Ethos line is known for a slightly cool or neutral color rendition. This transparency ensures that the subtle hues of stars and the pale greens or blues of planetary nebulae are rendered with absolute honesty.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDistortion Control:\u003c\/strong\u003e Through advanced optical modeling, Tele Vue has minimized angular magnification distortion. This ensures that as you slew your telescope across a star field, the stars do not stretch or squish as they move toward the edge, preserving a natural sense of perspective.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Title image text --\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003c!-- Main Image --\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eVersatility Across All Telescope Types\u003c\/h3\u003e\n\u003cp\u003eThe Tele Vue Ethos 21mm is often referred to as the SCT-Ethos because of its transformative effect on Schmidt-Cassegrain telescopes. In an 11-inch f\/10 SCT, for example, it provides enough magnification to make deep-sky objects pop while still offering a field of view wide enough to encircle the entire Moon with room to spare.\u003c\/p\u003e\n\u003cp\u003eFor owners of large Dobsonian reflectors, this eyepiece is the ultimate workhorse. At f\/4.5 or f\/5, the 21mm focal length yields a healthy 4mm to 5mm exit pupil. This is widely considered the sweet spot for deep-sky observing, as it is bright enough to use with O-III or UHC nebula filters while providing enough magnification to resolve globular clusters like M13 into thousands of individual stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Title image text --\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003c!-- Main Image --\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBuild Quality and Ergonomics\u003c\/h3\u003e\n\u003cp\u003eThis is a substantial piece of equipment, weighing approximately 2.25 lbs (1,020 g). It is built with the ruggedness and precision expected of a premium Tele Vue product.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel Design:\u003c\/strong\u003e The 2-inch barrel features a tapered safety undercut. Unlike traditional square-cut grooves that can snag on brass compression rings, the Ethos undercut is chamfered to allow for smooth insertion and removal while still providing a fail-safe against the eyepiece slipping out of the focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEye Relief:\u003c\/strong\u003e With 15mm of eye relief, the Ethos 21mm is comfortable for most observers. While it may be tight for those who must wear thick eyeglasses to correct for astigmatism, the eyepiece is fully compatible with the Tele Vue Dioptrx corrector. This allows you to attach a prescription lens directly to the eyepiece, giving you the sharpest possible view without the need for glasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTactile Grip:\u003c\/strong\u003e A thick, textured rubber grip ensures secure handling in cold weather or when wearing gloves, a critical feature for an eyepiece of this size and weight.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Title image text --\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003c!-- Main Image --\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eComparative Perspective: Why Choose the 21mm Ethos?\u003c\/h3\u003e\n\u003cp\u003eWhen building a high-end eyepiece collection, the 21mm Ethos often competes with other legendary Tele Vue optics.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Nagler 31mm (The Type 5):\u003c\/strong\u003e The 31mm Nagler provides a wider true field of view and a larger exit pupil. However, the 21mm Ethos offers significantly higher magnification and a darker sky background. Many observers find the 21mm Ethos more useful for general observing because it makes small, faint objects easier to see against the background glow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Panoptic 35mm or 41mm:\u003c\/strong\u003e These are excellent low-power, wide-angle eyepieces. However, they lack the immersion factor of the 100° field. The Ethos 21mm can often show as much sky as a 35mm Panoptic but at a much more engaging magnification level.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Ethos 17mm:\u003c\/strong\u003e The 17mm is lighter and offers higher magnification, but the 21mm is the king of the hill for framing large-scale celestial structures. The two actually complement each other perfectly in a high-end kit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Title image text --\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003c!-- Main Image --\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eIs the Tele Vue Ethos 21mm Worth the Investment?\u003c\/h3\u003e\n\u003cp\u003eThe Ethos 21mm is a lifetime eyepiece. While the price reflects its position at the top of the market, its value is found in the hundreds of hours of awe-inspiring views it provides. By essentially replacing the need for a separate finder eyepiece and a medium-power eyepiece, it simplifies your kit while elevating your observing experience to the highest possible level.\u003c\/p\u003e\n\u003cp\u003eEvery Tele Vue Ethos is individually tested at their New York facility to ensure it meets strict optical and cosmetic standards. When you buy an Ethos, you are not just buying glass and metal; you are buying the assurance that you are seeing the universe exactly as it is, with no compromises.\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\"\u003e21mm Ethos vs. 31mm Nagler: Which one do I actually need?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is the most debated comparison in the hobby. Here is how they differ:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe 31mm Nagler:\u003c\/strong\u003e Gives you the widest possible True Field of View and a larger exit pupil. It is better for \"scanning\" the Milky Way under pitch-black skies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe 21mm Ethos:\u003c\/strong\u003e Provides a darker sky background and 50% more magnification while maintaining nearly the same field as a 26mm Nagler.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Verdict:\u003c\/strong\u003e If you observe from light-polluted areas, the 21mm Ethos is superior because the higher magnification \"tucks in\" the sky glow, making faint objects pop.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is it often called the \"SCT-Ethos\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOwners of 8\", 11\", and 14\" Schmidt-Cassegrain Telescopes (SCTs) consider this the \"perfect\" eyepiece for several reasons:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnification:\u003c\/strong\u003e It provides the power needed to resolve globular clusters like M13.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField of View:\u003c\/strong\u003e The 100° field is wide enough to fit the entire Moon with room to spare, even in long focal length scopes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatility:\u003c\/strong\u003e It essentially functions as a \"finder\" eyepiece and a high-power eyepiece in one.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 21mm Ethos with eyeglasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 21mm Ethos has 15mm of eye relief. Here is what that means for your viewing:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWithout Glasses:\u003c\/strong\u003e You will find it very comfortable. The \"spacewalk\" effect is best achieved by getting your eye close to the lens.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith Glasses:\u003c\/strong\u003e 15mm is \"tight\" for thick frames. You may not see the full 100° field without removing your glasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Solution:\u003c\/strong\u003e This eyepiece is compatible with the \u003cstrong\u003eTeleVue Dioptrx\u003c\/strong\u003e, which allows you to attach a prescription lens directly to the eyepiece and observe without glasses.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need to rebalance my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is a substantial piece of equipment, weighing approximately 2.25 lbs (1,020 g). Consider the following:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDobsonians:\u003c\/strong\u003e You may need to add magnetic counterweights or adjust altitude tension to prevent the front of the scope from dipping.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefractors\/SCTs:\u003c\/strong\u003e Ensure you use a high-quality 2\" star diagonal with a strong compression ring to prevent the eyepiece from slipping.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a coma corrector?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhether you need a corrector depends on your telescope's focal ratio:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ef\/5 or Slower:\u003c\/strong\u003e Many users find the edge correction so good that a corrector is not strictly necessary.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ef\/4.5 or Faster:\u003c\/strong\u003e In fast Newtonians, the 100° field will reveal the natural coma of the mirror. We highly recommend the \u003cstrong\u003eTeleVue Paracorr Type 2\u003c\/strong\u003e for pinpoint stars to the edge.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs it parfocal with other eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 21mm Ethos is parfocal with the following legendary TeleVue optics:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e31mm Nagler (Type 5)\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e17mm Ethos\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis allows you to swap between these eyepieces with little to no refocusing required, keeping your session seamless.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does it handle light pollution?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 21mm focal length is a \"sweet spot\" for urban and suburban observers:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eContrast:\u003c\/strong\u003e By providing more magnification than a 31mm or 40mm eyepiece, it reduces the exit pupil size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDarker Background:\u003c\/strong\u003e This creates a darker sky background, which increases the perceived contrast of nebulae and galaxies against the city glow.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel #\u003c\/td\u003e\n\u003ctd\u003eETH-21.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e21 mm\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\u003eFilter Compatibility\u003c\/td\u003e\n\u003ctd\u003eBarrel threaded for standard 2\" filters\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\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e15 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e36.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e36 oz (2.25 lb \/ 1020 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e3.0\" x 4.3\" (76 x 109 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\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-21mm-Eyepiece-1.jpg?v=1774383600\" alt=\"Ethos 21mm Eyepiece\" class=\"DAV-img-box\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eEthos 21mm 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\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-2inch-Dustcap.jpg?v=1774403118\" alt=\"Ethos 21mm Dust Cap (top)\" class=\"DAV-img-box\"\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\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-2inch-Dustcap.jpg?v=1774403118\" alt=\"thos 21mm Dust Cap (bottom)\" class=\"DAV-img-box\"\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!-- Add more items as needed --\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\/TeleVue-Ethos-21mm-Eyepiece-Manual.pdf?v=1774384900\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 512 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" 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\"\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!-- Add more items as needed --\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca rel=\"noopener\" href=\"https:\/\/davidastro.com\/pages\/televue-warranty-policy\" target=\"_blank\"\u003eTeleVue 5-Year Limited Warranty for Telescopes and Accessories\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51079426408733,"sku":"TV-ETH-21.0","price":1417.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-21mm-Eyepiece-1.jpg?v=1774383600"},{"product_id":"televue-ethos-17mm-100-eyepiece","title":"TeleVue Ethos 17mm 100° Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e17mm Focal Length\u003c\/li\u003e\n\u003cli\u003eUltra-Wide 100° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" Diameter Barrel\u003c\/li\u003e\n\u003cli\u003e15mm Eye Relief\u003c\/li\u003e\n\u003cli\u003e29.6mm Field Stop\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n  \u003cli\u003eQ\u0026amp;A\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\u003eTele Vue Ethos 17mm 100° Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Ethos 17mm eyepiece is a crowning achievement in modern optical engineering, offering a focal length many veteran observers consider the absolute sweet spot for deep sky exploration. While the Ethos series changed the landscape of amateur astronomy with its 100° apparent field of view (AFOV), the 17mm model specifically bridges the gap between low power scanning and high power planetary detail. It provides a massive true field of view while maintaining the magnification necessary to resolve the intricate structures of distant galaxies and nebulae.\u003c\/p\u003e\n\u003cp\u003eStepping up to the Ethos 17mm is less about looking through a telescope and more about looking through a window. The framing is so vast that the metal housing of the eyepiece seems to vanish, leaving you suspended in a panoramic view of the cosmos. For the serious astronomer, this eyepiece represents a lifetime investment in visual excellence, combining the legendary \"spacewalk\" immersion with the uncompromising contrast and sharpness that Al Nagler and his team are known for.\u003c\/p\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° Experience: Beyond Human Peripheral Vision\u003c\/h3\u003e\n\u003cp\u003eThe primary draw of the Ethos 17mm is its breathtaking 100° apparent field of view. To appreciate the scale, consider that an 82° Nagler, once the gold standard for wide fields, offers significantly less viewing area. The Ethos 17mm provides a field that essentially matches or exceeds the limit of what the human eye can perceive at once, requiring you to move your eye to \"look around\" the scene.\u003c\/p\u003e\n\u003cp\u003eIn practical application, this massive field translates to efficiency. Because the 17mm focal length provides higher magnification than its 21mm sibling, it darkens the sky background significantly, yet the 100° field ensures you are still seeing a swath of sky typically reserved for low power eyepieces. You can frame the entire Double Cluster in Perseus or the expansive tendrils of the Veil Nebula while enjoying the resolution and contrast that come with a 17mm focal length. It effectively does the work of two eyepieces, functioning as both a wide field finder and a high contrast medium power powerhouse.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePrecision Optics and Edge-to-Edge Correction\u003c\/h3\u003e\n\u003cp\u003eTele Vue has built its reputation on the ability to handle \"fast\" telescopes. The Ethos 17mm is engineered to perform flawlessly even in f\/4 or f\/4.5 focal ratios, where lesser eyepieces often suffer from astigmatism or field curvature at the edges. This eyepiece maintains pinpoint star images across the entire 29.6mm field stop.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvanced Multi-Coatings:\u003c\/strong\u003e Every air-to-glass surface is treated with specialized multi-coatings to ensure maximum light transmission. This results in an exceptionally bright image, allowing you to catch the faintest hints of nebulosity in objects like the Horsehead Nebula.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperior Contrast:\u003c\/strong\u003e The internal mechanical design utilizes extensive baffling and blackened lens edges to eliminate stray light. When a bright star is just outside the field of view, the background remains inky black, free from the \"ghosting\" or glare that plagues many ultra-wide designs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical Geometry:\u003c\/strong\u003e The Ethos design specifically addresses angular magnification distortion. This means objects retain their correct proportions as they drift from the center to the edge, a critical feature for those using non-tracking Dobsonian telescopes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeutral Color Balance:\u003c\/strong\u003e Tele Vue optics are celebrated for their \"pure\" white light transmission. There is no yellow or blue tinting, ensuring that the natural colors of star clusters and the subtle hues of planetary discs are preserved exactly as they are.\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\u003eOptimizing the Exit Pupil for Deep Sky\u003c\/h3\u003e\n\u003cp\u003eFor many observers, the 17mm focal length is the \"Goldilocks\" zone. In a standard f\/10 Schmidt-Cassegrain, it yields a 1.7mm exit pupil, which is ideal for resolving globular clusters and planetary nebulae. In a fast f\/4.5 Dobsonian, it produces a 3.8mm exit pupil, which is the perfect balance for deep sky work, providing enough light for the eye to perceive color and detail without the sky background becoming washed out by light pollution.\u003c\/p\u003e\n\u003cp\u003eThis versatility makes the Ethos 17mm the most used eyepiece in many collections. Whether you are hunting for small, faint galaxies or taking in the grandeur of the Pleiades, the 17mm provides the scale and brightness required for a truly transformative observing session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eErgonomics and Mechanical Excellence\u003c\/h3\u003e\n\u003cp\u003eDespite its complex 100° optical design, the Ethos 17mm remains more manageable than the massive 21mm version. Weighing in at approximately 1.5 lbs (703 g), it is easier to balance on a wider variety of telescope mounts while still feeling like a robust, professional-grade instrument.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety and Stability:\u003c\/strong\u003e The 2-inch barrel includes the signature Tele Vue tapered safety undercut. This design ensures that even if your focuser lock loosens slightly, the eyepiece remains securely held, preventing accidental drops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eViewing Comfort:\u003c\/strong\u003e The 15mm of eye relief is generous for an ultra-wide eyepiece. For those who observe with glasses, the Ethos 17mm is fully compatible with the Tele Vue Dioptrx system, which corrects for eyesight astigmatism so you can observe without the hindrance of spectacles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll-Weather Grip:\u003c\/strong\u003e The textured rubber housing provides a secure grip in humid conditions or when wearing gloves during winter observing sessions. The fold-down rubber eyeguard helps block lateral light pollution and positions the eye at the perfect distance for a comfortable view.\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\u003eComparative Perspective: The 17mm Ethos in the Kit\u003c\/h3\u003e\n\u003cp\u003eHow does the 17mm Ethos compare to other legendary glass in the Tele Vue stable?\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Ethos 21mm:\u003c\/strong\u003e The 21mm is the \"finder\" of the series with a wider true field. However, the 17mm is often preferred for smaller deep sky objects because the higher magnification makes them easier to see. The 17mm is also significantly lighter and easier to balance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Nagler 17mm Type 4:\u003c\/strong\u003e The Nagler 17mm is a classic with a very comfortable 82° field. However, the Ethos 17mm provides a nearly 50% larger viewing area and improved edge correction, making it the definitive upgrade for those seeking the ultimate immersion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Delos 17.3mm:\u003c\/strong\u003e If you require 20mm of eye relief for thick glasses, the Delos is a fantastic choice. But if you want the \"floating in space\" feeling that only a 100° field can provide, the Ethos is unrivaled.\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\u003eIs the Tele Vue Ethos 17mm Right for You?\u003c\/h3\u003e\n\u003cp\u003eThe Ethos 17mm is designed for the observer who refuses to compromise. It is for the astronomer who wants to see the spiral arms of M51 framed by the deep black of space, without the distraction of a narrow field stop. It is a \"forever\" eyepiece, designed to be passed down through generations. When you consider that it can replace several lower-quality eyepieces in your kit, the value becomes clear. You are paying for the highest level of craftsmanship available in the world of consumer optics today.\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\"\u003eIs the Ethos 17mm compatible with 1.25\" focusers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, due to the large field stop and optical design, this eyepiece requires a 2-inch focuser or diagonal. Attempting to adapt it to 1.25\" would result in severe vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does it perform with a Barlow or PowerMate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eExtremely well. Pairing the 17mm Ethos with a 2x PowerMate creates a high-power 8.5mm 100° eyepiece, which is exceptional for high-magnification lunar and planetary viewing while maintaining the immersive wide field.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a Coma Corrector?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIf you are using a Newtonian reflector faster than f\/5, a Tele Vue Paracorr Type 2 is highly recommended. The Ethos 17mm is sharp enough to reveal the inherent coma of your telescope mirror, and the Paracorr will ensure the stars stay sharp to the very edge of that 100° field.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this eyepiece parfocal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Ethos 17mm is parfocal with the 21mm Ethos, 13mm Ethos, and 31mm Nagler. This allows you to swap between these focal lengths during an observing session with minimal refocusing required.\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\u003eModel #\u003c\/td\u003e\n\u003ctd\u003eETH-17.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e17 mm\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\u003eApparent Field of View\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\u003e15 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e29.6 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e24.8 oz (1.55 lb \/ 703 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e4.4\" (112 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\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue Ethos 17mm Eyepiece\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-17mm-Eyepiece-1.jpg?v=1774383600\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eEthos 17mm Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue 2-inch Dust Cap (top)\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-2inch-Dustcap.jpg?v=1774403118\"\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\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue 2-inch Dust Cap (bottom)\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-2inch-Dustcap.jpg?v=1774403118\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap (Bottom)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-Eyepiece-Instructions.pdf?v=1774384900\" 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\u003ca href=\"https:\/\/davidastro.com\/pages\/televue-warranty-policy\" target=\"_blank\" rel=\"noopener\"\u003eTeleVue 5-Year Limited Warranty for Telescopes and Accessories\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51080422392093,"sku":"TV-ETH-17.0","price":1261.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-17mm-Eyepiece-1.jpg?v=1774404190"},{"product_id":"televue-ethos-13mm-100-eyepiece","title":"TeleVue Ethos 13mm 100° Eyepiece - 1.25\"\/2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e13mm Focal Length\u003c\/li\u003e\n\u003cli\u003e100° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" \/ 1.25\" Hybrid Barrel\u003c\/li\u003e\n\u003cli\u003e15mm Eye Relief\u003c\/li\u003e\n\u003cli\u003e22.3mm 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\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\u003eTeleVue Ethos 13mm 100° Eyepiece - 2\" \/ 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Ethos 13mm is the original pioneer that launched the 100° revolution. Designed to provide a \"portal\" into the deep universe, this eyepiece offers a focal length that many observers consider the ultimate sweet spot for high-contrast, deep-sky observing. It delivers the magnification necessary to pull detail out of galaxies and nebulae while maintaining a field of view so wide it encompasses entire clusters.\u003c\/p\u003e\n\u003cp\u003ePeering through the 13mm Ethos is often described as standing on the edge of a precipice looking into space. With its immersive 100° apparent field of view, the black edges of the eyepiece barrel disappear from your peripheral vision, leaving only the target suspended in a bottomless, velvet-black sky.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Original 100° Masterpiece\u003c\/h3\u003e\n\u003cp\u003eThe 13mm Ethos was the first eyepiece to successfully implement a well-corrected 100° field, and it remains a benchmark for the industry. This focal length provides a powerful magnification boost over lower-power finders, yet its field of view is wide enough to compete with most mid-range wide-angle eyepieces.\u003c\/p\u003e\n\u003cp\u003eFor most telescopes, the 13mm serves as the \"primary\" deep-sky eyepiece. It provides the ideal exit pupil for detecting subtle low-contrast features in spiral arms of galaxies or the delicate filaments of supernova remnants like the Veil Nebula. The 100° field isn't just about size; it's about context—allowing you to see a galaxy in relation to its surrounding 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\u003eSuperior Optical Engineering\u003c\/h3\u003e\n\u003cp\u003eLike all eyepieces in the Ethos line, the 13mm was designed by Paul Dellechiaie to meet the exacting standards of Al Nagler. It is engineered to be as sharp at the very edge of the field as it is in the center.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEdge Sharpness:\u003c\/strong\u003e Stars remain tight, pinpoint dots across the entire 100° expanse, even in fast f\/4 Newtonian reflectors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Contrast Coatings:\u003c\/strong\u003e Advanced multi-coatings and blackened lens edges ensure that stray light is eliminated, providing the inky-black backgrounds Tele Vue is famous for.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHybrid Barrel Versatility:\u003c\/strong\u003e The 13mm Ethos features a unique hybrid barrel design, allowing it to be used in both 2\" and 1.25\" focusers or diagonals, making it compatible with almost any telescope in your collection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat Field:\u003c\/strong\u003e The optical design minimizes field curvature, ensuring that you don't have to refocus as you move your eye from the center to the edge of the view.\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\u003eVersatility and Application\u003c\/h3\u003e\n\u003cp\u003eThe 13mm Ethos is a versatile performer. In long focal length telescopes like SCTs or large refractors, it provides high-power views of planetary nebulae and lunar details. In fast Dobsonians, it is the perfect \"galaxy hunter,\" offering a dark sky background and enough power to resolve individual stars in globular clusters.\u003c\/p\u003e\n\u003cp\u003eBecause it creates such a massive true field for its magnification, it often allows you to keep an object in view for much longer in non-tracking telescopes compared to 50° or 70° eyepieces, making it a favorite for manual Dobsonian users.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eErgonomics and Dioptrx Compatibility\u003c\/h3\u003e\n\u003cp\u003eDespite its complex optical train, the 13mm Ethos is designed for comfort. Weighing just over 1 lb, it is significantly lighter than the 21mm version, making it easier to manage on smaller mounts.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEye Relief:\u003c\/strong\u003e The 15mm eye relief is well-balanced. While it provides an immersive view for most, it also accepts the Tele Vue Dioptrx system to correct for astigmatism, ensuring every user can see pinpoint stars without needing to wear glasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety Features:\u003c\/strong\u003e The 1.25\" and 2\" barrel sections both feature safety undercuts to prevent the eyepiece from accidentally sliding out of the focuser.\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\u003eComparative Perspective: Why the 13mm?\u003c\/h3\u003e\n\u003cp\u003eIn the Tele Vue hierarchy, the 13mm occupies a special place:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Nagler 12mm or 13mm:\u003c\/strong\u003e While the Nagler series offers a legendary 82° field, the 13mm Ethos provides nearly 50% more viewing area, significantly increasing the \"immersion\" factor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Ethos 10mm or 17mm:\u003c\/strong\u003e The 13mm is often chosen as the \"anchor\" of an Ethos kit, sitting perfectly between the high-power 10mm and the wider 17mm or 21mm options.\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\"\u003eIs the 13mm Ethos better for galaxies or planets?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile world-class for both, it is the ultimate \"galaxy hunter\" for several reasons:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Contrast:\u003c\/strong\u003e The 13mm focal length darkens the sky background, making faint spiral arms easier to see.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnification:\u003c\/strong\u003e It provides the power needed to resolve globular clusters into individual stars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFraming:\u003c\/strong\u003e The 100° field allows you to view large nebulae in their entirety without losing detail.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003e13mm Ethos vs. 12mm Delos: Which should I choose?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe choice depends on your preference for eye relief versus immersion:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e12mm Delos:\u003c\/strong\u003e Best for eyeglass wearers due to its long 20mm eye relief and adjustable eye-cup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e13mm Ethos:\u003c\/strong\u003e Best for the \"spacewalk\" experience. It offers 15mm of eye relief and a significantly wider field of view.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this in a 1.25\" diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 13mm Ethos is highly versatile thanks to its hybrid design:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Barrel:\u003c\/strong\u003e It features both 1.25\" and 2\" barrels for use in almost any telescope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight Warning:\u003c\/strong\u003e It weighs 1.3 lbs (590 g); ensure your 1.25\" focuser or diagonal can securely support the load.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the eye relief of the 13mm Ethos compare to the 21mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBoth the 13mm and 21mm Ethos models provide 15mm of eye relief. Here is how that impacts your viewing:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eComfort:\u003c\/strong\u003e 15mm is generally considered very comfortable for most observers not wearing glasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlasses:\u003c\/strong\u003e If you must wear glasses for astigmatism, you may not see the full 100° field at once.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolution:\u003c\/strong\u003e Both are fully compatible with \u003cstrong\u003eTele Vue Dioptrx\u003c\/strong\u003e to correct vision without needing glasses.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a Paracorr with the 13mm Ethos?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhether you need a coma corrector depends on your telescope's speed:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ef\/4.5 or Faster:\u003c\/strong\u003e The 100° field will reveal the natural coma of your mirror. A \u003cstrong\u003eParacorr Type 2\u003c\/strong\u003e is highly recommended for pinpoint stars to the edge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ef\/5 or Slower:\u003c\/strong\u003e Most observers find the correction excellent and do not require a Paracorr.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does this focal length handle light pollution?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 13mm focal length is an ideal \"Urban Workhorse\" for suburban skies:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDarker Backgrounds:\u003c\/strong\u003e It reduces the exit pupil size compared to 21mm or 31mm eyepieces, effectively \"tucking in\" sky glow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncreased Contrast:\u003c\/strong\u003e This makes deep-sky objects stand out more clearly against the background city light.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel #\u003c\/td\u003e\n\u003ctd\u003eETH-13.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e13 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\" \/ 1.25\" Hybrid\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Compatibility\u003c\/td\u003e\n\u003ctd\u003eThreaded for 1.25\" filters\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\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e15 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e22.3 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e20.8 oz (1.3 lb \/ 590 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e2.5\" x 5.8\" (63.5 x 147 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\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-13mm-Eyepiece-1.jpg?v=1775087658\" alt=\"Ethos 13mm Eyepiece\" class=\"DAV-img-box\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eEthos 13mm 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\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-2inch-Dustcap.jpg\" alt=\"Dust Cap (top)\" class=\"DAV-img-box\"\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\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-1_25inch-Dustcap.jpg?v=1774403145\" alt=\"Dust Cap (bottom)\" class=\"DAV-img-box\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap (Bottom)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-6-8-10-13mm-Eyepieces-Manual.pdf?v=1775092656\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 512 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" 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\"\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\u003ca rel=\"noopener\" href=\"https:\/\/davidastro.com\/pages\/televue-warranty-policy\" target=\"_blank\"\u003eTeleVue 5-Year Limited Warranty for Telescopes and Accessories\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is the 13mm Ethos better for galaxies or planets?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"While world-class for both, the 13mm Ethos is an ultimate 'galaxy hunter.' The 13mm focal length darkens the sky background to increase contrast on faint spiral arms, provides enough magnification to resolve globular clusters into individual stars, and uses its 100° field to frame large nebulae in their entirety.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"13mm Ethos vs. 12mm Delos: Which should I choose?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The choice depends on your preference for eye relief versus immersion. The 12mm Delos is better for eyeglass wearers due to its long 20mm eye relief, while the 13mm Ethos is best for the 'spacewalk' experience, offering 15mm of eye relief and a significantly wider 100° field of view.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use the 13mm Ethos in a 1.25\\\" diagonal?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, the 13mm Ethos features a hybrid dual-barrel design, allowing it to fit both 1.25\\\" and 2\\\" focusers or diagonals. Note that it weighs 1.3 lbs (590 g), so ensure your 1.25\\\" equipment can securely support the weight.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How does the eye relief of the 13mm Ethos compare to the 21mm?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Both the 13mm and 21mm Ethos models provide 15mm of eye relief. This is comfortable for most observers not wearing glasses. For those with astigmatism who must wear a prescription, both models are fully compatible with Tele Vue Dioptrx correctors.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a Paracorr with the 13mm Ethos?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your Newtonian telescope is f\/4.5 or faster, the wide 100° field will reveal the natural coma of your mirror. In these fast scopes, a Tele Vue Paracorr Type 2 is highly recommended for pinpoint stars to the edge. For scopes f\/5 or slower, a Paracorr is usually not required.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How does the 13mm Ethos handle light pollution?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 13mm focal length is an ideal 'Urban Workhorse.' By reducing the exit pupil size compared to lower-power eyepieces, it darkens the sky glow and increases the perceived contrast of deep-sky objects against background city light.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is it difficult to see the full 100° field of the 13mm Ethos?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 13mm Ethos is designed for peripheral immersion. Instead of staring at the edges, the field stop disappears from view, creating a 'spacewalk' sensation where you feel suspended in space rather than looking through a telescope.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51110033981725,"sku":"TV-ETH-13.0","price":1043.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-13mm-Eyepiece-2.jpg?v=1775092984"},{"product_id":"televue-ethos-10mm-100-eyepiece","title":"TeleVue Ethos 10mm 100° Eyepiece - 1.25\"\/2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e10mm Focal Length\u003c\/li\u003e\n\u003cli\u003e100° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" \/ 1.25\" Hybrid Barrel\u003c\/li\u003e\n\u003cli\u003e15mm Eye Relief\u003c\/li\u003e\n\u003cli\u003e17.7mm 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\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\u003eTeleVue Ethos 10mm 100° Eyepiece - 2\" \/ 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Ethos 10mm sits at the strategic \"power center\" of the Ethos line. While the 21mm and 13mm models are celebrated for their wide field framing, the 10mm focal length is where the 100° Apparent Field of View (AFOV) truly begins to pull back the curtain on the deep universe. It offers a higher magnification level that darkens sky backgrounds significantly, making it an essential tool for resolving the core details of distant galaxies and globular clusters.\u003c\/p\u003e\n\u003cp\u003eThe 100° apparent field removes the visible field stop in most observing conditions, creating the classic ‘spacewalk experience’ where the eyepiece frame disappears. At this focal length, the magnification is high enough to reveal intricate structural details in planetary nebulae, yet the field of view remains wide enough to keep those objects centered in non tracking telescopes for remarkably long periods. Best of all, it is parfocal with the Ethos 13mm, allowing for seamless transitions during your observing session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eHigh Magnification Without the \"Tunnel Vision\"\u003c\/h3\u003e\n\u003cp\u003eIn traditional high power eyepieces, increasing magnification usually means a claustrophobic decrease in the field of view. The Ethos 10mm shatters this limitation. By providing a 100° field, it allows you to observe at high power while still seeing the object’s celestial neighborhood.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep Sky Resolution:\u003c\/strong\u003e Perfect for resolving M13 or M92 into thousands of pinpoint stars while maintaining a wide, dark background.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar Exploration:\u003c\/strong\u003e Provides an incredibly immersive view of the lunar surface, allowing you to fly over craters and rilles with zero sense of equipment interference.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExit Pupil Efficiency:\u003c\/strong\u003e In most f\/5 to f\/10 telescopes, the 10mm focal length produces an exit pupil that balances brightness and contrast perfectly for the human eye.\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\u003eThe Universal Hybrid Design\u003c\/h3\u003e\n\u003cp\u003eThe 10mm Ethos is designed for maximum compatibility across your entire telescope collection. Its hybrid barrel system allows it to slide into 1.25\" focusers for portable refractors or 2\" diagonals for larger instruments.\u003c\/p\u003e\n\u003cp\u003eEvery internal optical surface is multi coated and every lens edge is blackened. This meticulous attention to detail results in world class contrast. When observing near a bright object like the Moon or Jupiter, the 10mm Ethos suppresses ghosting and internal reflections, ensuring the views remain \"inky black\" and pure.\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\u003eErgonomics and Dioptrx Compatibility\u003c\/h3\u003e\n\u003cp\u003eWeighing in at approximately 1.1 lbs (500g), the 10mm Ethos is a manageable addition to any imaging train. Like all eyepieces in the Ethos series, it features a consistent 15mm of eye relief, providing a comfortable and predictable viewing experience for all observers.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDioptrx Ready:\u003c\/strong\u003e For those with astigmatism, the 10mm Ethos is fully compatible with the Tele Vue Dioptrx corrector, allowing for sharp views without the need for eyeglasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First:\u003c\/strong\u003e Features the signature Tele Vue safety undercut, preventing the eyepiece from falling out if the focuser screws loosen.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 10mm Ethos better than the 13mm for deep sky?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 10mm offers specific advantages for high contrast targets and smaller objects:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDarker Sky:\u003c\/strong\u003e The 10mm provides a smaller exit pupil, darkening the background sky glow more than the 13mm, which makes faint nebulae and galaxies \"pop.\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigher Resolution:\u003c\/strong\u003e It is generally superior for resolving the cores of globular clusters (like M13) and detecting planetary details.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParfocal Design:\u003c\/strong\u003e The 10mm is parfocal with the 13mm Ethos, allowing you to swap between these two \"workhorse\" focal lengths without refocusing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow much eye relief does the 10mm Ethos have?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 10mm Ethos features 15mm of eye relief, which is the standard across the entire Ethos focal length range:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsistency:\u003c\/strong\u003e Because all Ethos eyepieces (from 3.7mm to 21mm) share this 15mm eye relief, your head position remains identical when swapping focal lengths.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyeglass Users:\u003c\/strong\u003e While 15mm is comfortable for most, those with severe astigmatism can use the Tele Vue Dioptrx system instead of glasses to maintain the full 100° view.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the 10mm Ethos considered a perfect match for SCTs?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor owners of Schmidt Cassegrain Telescopes (8\", 9.25\", 11\", and 14\"), the 10mm Ethos is often the most used eyepiece in the kit:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe \"Sweet Spot\" Power:\u003c\/strong\u003e In an 8\" f\/10 SCT, it provides 200x magnification with a 1mm exit pupil, which is widely considered the optimal balance of power and brightness for most atmospheric conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFraming:\u003c\/strong\u003e The 100° field provides enough context to frame most lunar features and mid sized deep sky objects that would feel \"cramped\" in narrower high power eyepieces.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 10mm Ethos good for planetary viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 10mm Ethos is an exceptional planetary tool, provided your telescope has sufficient focal length:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong Focal Length Scopes:\u003c\/strong\u003e It is a great match for scopes like an 8\" SCT or large Dobsonians with 1500mm+ of focal length where high magnification is easily achieved.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManual Tracking:\u003c\/strong\u003e The massive 100° field allows a planet to drift across the view for a much longer time before you need to nudge the scope, which is a major advantage for manual Dobsonian users.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContrast:\u003c\/strong\u003e With every lens edge blackened and advanced multi coatings, it provides the \"cool\" color rendition and high contrast necessary for lunar and planetary details.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 10mm Ethos in a 1.25\" diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 10mm Ethos features a hybrid 2\" \/ 1.25\" barrel design:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight Consideration:\u003c\/strong\u003e It weighs 1.1 lbs (500g). Ensure your 1.25\" focuser or diagonal has a strong locking mechanism to support the weight.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a Paracorr with the 10mm Ethos?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis depends entirely on your telescope's focal ratio:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ef\/4.5 or Faster:\u003c\/strong\u003e In fast Newtonians, the 100° field is wide enough to show the natural coma of your mirror. We highly recommend the Tele Vue Paracorr Type 2 for pinpoint stars to the very edge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSCTs and Refractors:\u003c\/strong\u003e Most Schmidt Cassegrain and refractor users find the field correction excellent without any additional correction.\u003c\/li\u003e\n\u003c\/ul\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\u003eModel #\u003c\/td\u003e\n\u003ctd\u003eETH-10.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e10 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\" \/ 1.25\" Hybrid\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Compatibility\u003c\/td\u003e\n\u003ctd\u003eThreaded for 1.25\" filters\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\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e15 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e17.7 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e17.6 oz (1.10 lb \/ 499 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e2.5\" x 5.2\" (63.5 x 132 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-10mm-Eyepiece.jpg\" alt=\"Ethos 10mm Eyepiece\" class=\"DAV-img-box\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eEthos 10mm 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\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-10mm-Eyepiece-1.jpg?v=1775093396\" alt=\"Dust Cap (top)\" class=\"DAV-img-box\"\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\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-1_25inch-Dustcap.jpg?v=1774403145\" alt=\"Dust Cap (bottom)\" class=\"DAV-img-box\"\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\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\/TeleVue-Ethos-6-8-10-13mm-Eyepieces-Manual.pdf?v=1775092656\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 512 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" 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\"\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\n\u003cli\u003e\u003ca rel=\"noopener\" href=\"https:\/\/davidastro.com\/pages\/televue-warranty-policy\" target=\"_blank\"\u003eTeleVue 5-Year Limited Warranty for Telescopes and Accessories\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n\"@context\": \"https:\/\/schema.org\",\n\"@type\": \"FAQPage\",\n\"mainEntity\": [\n{\n\"@type\": \"Question\",\n\"name\": \"Is the 10mm Ethos better than the 13mm for deep sky?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"The 10mm Ethos provides a smaller exit pupil which darkens the sky background more than the 13mm, increasing contrast on faint objects. It is also parfocal with the 13mm, making them a perfect pair for deep sky exploration.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"What is the eye relief of the 10mm Ethos?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"The 10mm Ethos features 15mm of eye relief. This is consistent across the entire Ethos line (from 3.7mm to 21mm), ensuring a predictable head position when swapping focal lengths.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"Why is the 10mm Ethos recommended for SCT telescopes?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"In f\/10 Schmidt Cassegrain telescopes, the 10mm Ethos provides an ideal 1mm exit pupil and 200x magnification (on an 8 inch model), balancing power and brightness perfectly for lunar and deep sky targets.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"Can I use the 10mm Ethos for planetary viewing?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"Yes, it is a great match for long focal length scopes like an 8 inch SCT or large Dobsonians (1500mm+). The 100 degree field allows planets to remain in view much longer in non tracking mounts.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"Can I use the 10mm Ethos in a 1.25-inch focuser?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"Yes, the 10mm Ethos has a hybrid barrel design that fits both 1.25 inch and 2 inch focusers and diagonals without the need for an adapter.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"Do I need a coma corrector for the 10mm Ethos?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"For fast Newtonian telescopes (f\/4.5 or faster), a Tele Vue Paracorr Type 2 is recommended to achieve pinpoint stars at the edges of the 100 degree field.\"\n}\n}\n]\n}\n\u003c\/script\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51110153519389,"sku":"TV-ETH-10.0","price":1043.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-10mm-Eyepiece-1.jpg?v=1775093396"},{"product_id":"televue-ethos-8mm-100-eyepiece","title":"TeleVue Ethos 8mm 100° Eyepiece - 1.25\"\/2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e8mm Focal Length\u003c\/li\u003e\n\u003cli\u003e100° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" \/ 1.25\" Hybrid Barrel\u003c\/li\u003e\n\u003cli\u003e15mm Eye Relief\u003c\/li\u003e\n\u003cli\u003e13.9mm 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\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\u003eTeleVue Ethos 8mm 100° Eyepiece - 2\" \/ 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Ethos 8mm is a high power powerhouse designed to deliver the ultimate high contrast observing experience. In the Ethos lineup, the 8mm focal length is frequently cited as the sweet spot for deep sky objects that require significant magnification to reveal internal structure. It provides a tight exit pupil that effectively suppresses sky glow, making it a favorite for observers in light polluted areas looking to maximize their telescope's potential.\u003c\/p\u003e\n\u003cp\u003eObserving through the 8mm Ethos offers a breathtaking 100° field that effectively removes the boundaries between you and the cosmos. Whether you are hunting for small planetary nebulae or diving into the intricate lanes of distant galaxies, the 8mm offers the resolution and contrast necessary for demanding visual work. Like its siblings, it is parfocal with the 13mm, 10mm, and 6mm Ethos models for effortless focal length changes.\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\u003eUnrivaled Contrast and Resolution\u003c\/h3\u003e\n\u003cp\u003eThe 8mm Ethos is engineered to provide sharp views across the entire 100° expanse. By pushing magnification while maintaining a massive field of view, it allows you to see the big picture without sacrificing the fine details found at the center of the field.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary Detail:\u003c\/strong\u003e Sharp enough for high resolution views of Jupiter’s GRS or Saturn’s Cassini Division in telescopes with moderate to long focal lengths.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlobular Cluster Specialist:\u003c\/strong\u003e Ideal for resolving the tightest stellar cores in objects like M15 or M2, where background darkness is key to seeing individual stars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImmersive Lunar Views:\u003c\/strong\u003e The 8mm provides a high altitude flyover feel that covers a significant portion of the lunar limb at high power.\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\u003eVersatile Hybrid Barrel Design\u003c\/h3\u003e\n\u003cp\u003eThe 8mm Ethos includes the Tele Vue hybrid barrel system, making it compatible with a wide range of equipment. It slides natively into 1.25\" focusers for small refractors or 2\" diagonals for larger reflectors and SCTs.\u003c\/p\u003e\n\u003cp\u003eTo ensure the purest views, every lens edge is blackened and the internal baffles are designed to eliminate stray light. This ensures that even when a bright moon is just outside the field, your view remains free of glare and internal reflections.\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\u003eBuilt for Long-Term Comfort\u003c\/h3\u003e\n\u003cp\u003eAt approximately 0.95 lbs (430g), the 8mm Ethos is slightly lighter and more compact than the 13mm and 10mm versions, making it easier to balance on smaller mounts. It maintains the series standard 15mm eye relief for a comfortable viewing experience.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDioptrx Compatibility:\u003c\/strong\u003e Fully compatible with Tele Vue Dioptrx to correct for eyesight astigmatism, allowing for sharp views without wearing glasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety Undercut:\u003c\/strong\u003e The barrel is machined with a safety groove to ensure the eyepiece stays securely in your focuser even if the set screw is slightly loose.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 8mm Ethos better than the 10mm for galaxies?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe choice usually depends on your specific telescope and sky conditions:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncreased Contrast:\u003c\/strong\u003e The 8mm focal length produces a smaller exit pupil than the 10mm, which darkens the sky background further. This often makes small, faint galaxies easier to detect.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDetail:\u003c\/strong\u003e For small planetary nebulae or resolving tight globular clusters, the 8mm provides that extra bit of magnification needed to see structural details.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow much eye relief does the 8mm Ethos have?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 8mm Ethos has 15mm of eye relief, which is the same as all other eyepieces in the Ethos series:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsistent Head Position:\u003c\/strong\u003e This allows you to switch between focal lengths in the Ethos line without having to adjust how close your eye is to the lens.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyeglass Use:\u003c\/strong\u003e If you must wear glasses, you may find it difficult to see the full 100° field at once. Most users prefer using the Tele Vue Dioptrx attachment for the best results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 8mm Ethos parfocal with other eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 8mm parfocal with the 6mm Ethos model. This means you can swap these eyepieces in and out of your diagonal with little to no refocusing required.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 8mm Ethos perform in an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a standard 8\" f\/10 Schmidt Cassegrain, the 8mm Ethos is an excellent high power tool:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnification:\u003c\/strong\u003e It provides 250x, which is often the maximum usable magnification on nights with good atmospheric seeing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExit Pupil:\u003c\/strong\u003e It yields a 0.8mm exit pupil, which is ideal for resolving the finest planetary and lunar details.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a Paracorr with the 8mm Ethos?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe requirement for a coma corrector is based on your telescope design:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Newtonians:\u003c\/strong\u003e For scopes f\/4.5 or faster, a Paracorr Type 2 is recommended to keep stars pinpoint sharp to the edge of the 100° field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOther Scopes:\u003c\/strong\u003e Refractors and SCTs typically do not require a coma corrector for the 8mm Ethos.\u003c\/li\u003e\n\u003c\/ul\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\u003eModel #\u003c\/td\u003e\n\u003ctd\u003eETH-08.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\" \/ 1.25\" Hybrid\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Compatibility\u003c\/td\u003e\n\u003ctd\u003eThreaded for 1.25\" filters\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\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e15 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e13.9 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e15.2 oz (0.95 lb \/ 430 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e2.1\" x 5.8\" (53.3 x 147 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-8mm-Eyepiece-1.jpg?v=1775095288\" alt=\"Ethos 8mm Eyepiece\" class=\"DAV-img-box\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eEthos 8mm 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\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-2inch-Dustcap.jpg?v=1774403118\" alt=\"Dust Cap (top)\" class=\"DAV-img-box\"\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\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-1_25inch-Dustcap.jpg?v=1774403145\" alt=\"Dust Cap (bottom)\" class=\"DAV-img-box\"\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\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\/TeleVue-Ethos-6-8-10-13mm-Eyepieces-Manual.pdf?v=1775092656\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 512 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" 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\"\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\n\u003cli\u003e\u003ca rel=\"noopener\" href=\"https:\/\/davidastro.com\/pages\/televue-warranty-policy\" target=\"_blank\"\u003eTeleVue 5-Year Limited Warranty for Telescopes and Accessories\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n\"@context\": \"https:\/\/schema.org\",\n\"@type\": \"FAQPage\",\n\"mainEntity\": [\n{\n\"@type\": \"Question\",\n\"name\": \"Is the 8mm Ethos better than the 10mm for galaxies?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"The 8mm provides a darker sky background and higher magnification, which is often better for resolving fine details in small galaxies and tight globular clusters.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"What is the eye relief of the 8mm Ethos?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"The 8mm Ethos features 15mm of eye relief, maintaining consistency with the entire Ethos focal length range for a predictable viewing experience.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"Is the 8mm Ethos parfocal with other Tele Vue eyepieces?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"Yes, it is parfocal with the 6mm Ethos model, allowing for focal length changes with minimal refocusing.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"How does the 8mm Ethos perform in an 8 inch SCT?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"In an 8 inch f\/10 SCT, it provides 250x magnification and a 0.8mm exit pupil, making it ideal for high power lunar and planetary observation.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"Can I use the 8mm Ethos in a 1.25 inch diagonal?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"Yes, its hybrid barrel design allows it to fit natively into both 1.25 inch and 2 inch diagonals and focusers.\"\n}\n}\n]\n}\n\u003c\/script\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51110184485149,"sku":"TV-ETH-08.0","price":980.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-8mm-Eyepiece-1.jpg?v=1775095288"},{"product_id":"televue-ethos-6mm-100-eyepiece","title":"TeleVue Ethos 6mm 100° Eyepiece - 1.25\"\/2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e6mm Focal Length\u003c\/li\u003e\n\u003cli\u003e100° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" \/ 1.25\" Hybrid Barrel\u003c\/li\u003e\n\u003cli\u003e15mm Eye Relief\u003c\/li\u003e\n\u003cli\u003e10.4mm 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\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\u003eTeleVue Ethos 6mm 100° Eyepiece - 2\" \/ 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Ethos 6mm is the definitive high magnification tool for observers who refuse to compromise on field of view. While typical high power eyepieces create a narrow tunnel effect, the 6mm Ethos provides a massive 100° window that is wide enough to keep the entire lunar disk in view even at significant magnifications. This focal length is specifically engineered to pull out the finest details in planetary nebulae and lunar rilles while maintaining the surrounding celestial context.\u003c\/p\u003e\n\u003cp\u003eUsing the 6mm Ethos creates a unique observing experience where the equipment seems to vanish. The 10.4mm field stop allows for high power resolution that can split tight double stars or reveal the inner filaments of the Crab Nebula. It is parfocal with the 13mm, 10mm, and 8mm Ethos models, ensuring that your transition to high power remains efficient and focused.\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\u003ePrecision Resolution for the Deepest Targets\u003c\/h3\u003e\n\u003cp\u003eHigh magnification is only useful if the contrast is high enough to distinguish subtle features. The 6mm Ethos uses advanced glass types and coatings to ensure that every photon of light from a distant planet or galaxy reaches your eye with maximum clarity.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary Performance:\u003c\/strong\u003e Provides enough power to resolve the Encke Division in Saturn’s rings during nights of steady atmospheric seeing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGalaxy Hunter:\u003c\/strong\u003e The 0.6mm exit pupil in an f\/10 system darkens the sky background to the limit, allowing the spiral structure of face on galaxies to become visible.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtended Drift Time:\u003c\/strong\u003e The 100° field means a planet stays in the sweet spot of your mirror significantly longer than it would in a standard 50° or 70° eyepiece.\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\u003eVersatile Hybrid Barrel Design\u003c\/h3\u003e\n\u003cp\u003eThe 6mm Ethos includes the Tele Vue hybrid barrel system, making it compatible with a wide range of equipment. It slides natively into 1.25\" focusers for small refractors or 2\" diagonals for larger reflectors and SCTs.\u003c\/p\u003e\n\u003cp\u003eTo ensure the purest views, every lens edge is blackened and the internal baffles are designed to eliminate stray light. This ensures that even when a bright moon is just outside the field, your view remains free of glare and internal reflections.\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 Spacewalk Standard\u003c\/h3\u003e\n\u003cp\u003eDespite its high magnification, the 6mm Ethos maintains the series standard 15mm eye relief. This consistency is vital for observers who frequently swap focal lengths to match the atmospheric seeing conditions of the night.\u003c\/p\u003e\n\u003cp\u003eThe hybrid barrel design allows the 6mm to be used in 1.25\" focusers for grab and go refractors or 2\" diagonals for larger light buckets. Every internal surface is optimized with blackened lens edges and multi coatings to suppress ghosting when observing bright targets like Mars or the Moon.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 6mm Ethos too much power for my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe usability of the 6mm depends on your telescope focal length and the local seeing conditions:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e8\" SCT:\u003c\/strong\u003e At 333x magnification, the 6mm Ethos is a specialized tool for nights of exceptional stability to view planetary detail.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ef\/5 Reflector:\u003c\/strong\u003e In a 1200mm focal length scope, it provides 200x, which is a perfect high power workhorse for most nights.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 6mm Ethos compare to the 6mm Delos?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary difference is the balance between eye relief and immersion:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDelos 6mm:\u003c\/strong\u003e Features 20mm of eye relief, making it the better choice for those who must observe while wearing glasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEthos 6mm:\u003c\/strong\u003e Provides the 100° \"spacewalk\" effect that makes the eyepiece barrel seem to disappear, though it has 15mm of eye relief.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 6mm Ethos parfocal with other Ethos eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 6mm is parfocal with the 8mm model. This allows you to increase magnification to check for fine detail without having to hunt for focus again.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 6mm Ethos in a 1.25\" diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 6mm Ethos uses a hybrid 2\" \/ 1.25\" barrel. It fits into standard 1.25\" equipment, but ensure your diagonal is high quality to support the 0.95 lb weight of the eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a Paracorr with the 6mm Ethos?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIf you are using a fast Newtonian (f\/4.5 or faster), a Paracorr Type 2 is recommended. While the magnification is high, the 100° field is wide enough that mirror coma will be visible at the edges without correction.\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\u003eModel #\u003c\/td\u003e\n\u003ctd\u003eETH-06.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e6 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\" \/ 1.25\" Hybrid\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Compatibility\u003c\/td\u003e\n\u003ctd\u003eThreaded for 1.25\" filters\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\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e15 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e10.4 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e15.5 oz (0.97 lb \/ 439 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e2.1\" x 5.8\" (53.3 x 147 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-6mm-Eyepiece-1.jpg?v=1775096168\" alt=\"Ethos 6mm Eyepiece\" class=\"DAV-img-box\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eEthos 6mm 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\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-2inch-Dustcap.jpg?v=1774403118\" alt=\"Dust Cap (top)\" class=\"DAV-img-box\"\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\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-1_25inch-Dustcap.jpg?v=1774403145\" alt=\"Dust Cap (bottom)\" class=\"DAV-img-box\"\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\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\/TeleVue-Ethos-6-8-10-13mm-Eyepieces-Manual.pdf?v=1775092656\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 512 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" 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\"\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\n\u003cli\u003e\u003ca rel=\"noopener\" href=\"https:\/\/davidastro.com\/pages\/televue-warranty-policy\" target=\"_blank\"\u003eTeleVue 5-Year Limited Warranty for Telescopes and Accessories\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n\"@context\": \"https:\/\/schema.org\",\n\"@type\": \"FAQPage\",\n\"mainEntity\": [\n{\n\"@type\": \"Question\",\n\"name\": \"How does the 6mm Ethos compare to the 6mm Delos?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"The Delos 6mm is better for those who must wear glasses with 20mm eye relief, while the Ethos 6mm provides an immersive 100 degree spacewalk view.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"Is the 6mm Ethos parfocal with other eyepieces?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"Yes, it is parfocal with the 8mm Ethos model for quick focal length changes without refocusing.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"Can I use the 6mm Ethos for planetary viewing?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"The 6mm Ethos is an excellent planetary eyepiece, providing high magnification while keeping the entire planet in the field longer in manual telescopes.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"What is the weight of the 6mm Ethos?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"The 6mm Ethos weighs approximately 15.5 oz (439g), making it a manageable high power addition to most telescope setups.\"\n}\n}\n]\n}\n\u003c\/script\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51110251561245,"sku":"TV-ETH-06.0","price":980.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-6mm-Eyepiece-1.jpg?v=1775096168"},{"product_id":"televue-ethos-sx-4-7mm-110-eyepiece","title":"TeleVue Ethos-SX 4.7mm 110° Eyepiece - 1.25\"\/2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e4.7mm Focal Length\u003c\/li\u003e\n\u003cli\u003e110° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" \/ 1.25\" Hybrid Barrel\u003c\/li\u003e\n\u003cli\u003e15mm Eye Relief\u003c\/li\u003e\n\u003cli\u003e8.9mm 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\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\u003eTeleVue Ethos 4.7mm SX 110° Eyepiece - 2\" \/ 1.25\"\u003c\/h2\u003e\n\u003cp\u003eIf you are looking for the highest practical magnification while still keeping the object comfortably in view, the 4.7mm Ethos SX sits in a very specific category: extreme power without losing context. This focal length represents a pinnacle in wide field optical engineering, pushing the boundaries from the standard 100° to a massive 110° Apparent Field of View. This provides 21 percent more field area than a 100° eyepiece, creating a viewing experience where the equipment boundaries completely disappear.\u003c\/p\u003e\n\u003cp\u003eThis is a specialist eyepiece. In a typical 8\" or larger telescope, it delivers very high magnification that only works well when atmospheric conditions cooperate. When they do, it gives you a level of detail on the Moon, planets, and compact deep sky objects that is difficult to achieve while still maintaining a wide, usable field. The 8.9mm field stop is optimized to provide high magnification while still offering enough sky context to frame entire lunar crater complexes or large planetary nebulae.\u003c\/p\u003e\n\u003cp\u003eThe extra space provided by the 110° field is not just visual comfort. It is what makes high magnification usable in manual tracking telescopes, where keeping objects centered would otherwise become a constant effort. It is parfocal with the 3.7mm Ethos SX, allowing for seamless high power transitions when atmospheric conditions permit.\u003c\/p\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 Without Losing the Object\u003c\/h3\u003e\n\u003cp\u003eAt 4.7mm, you are firmly in high magnification territory. In most telescopes, this is where the view normally becomes narrow and demanding to track. The 110° field changes that experience by expanding the peripheral view, allowing you to use high magnification without the claustrophobic sensation typically associated with short focal length eyepieces.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar Exploration:\u003c\/strong\u003e Wide enough to capture the entire Alpine Valley or the floor of Copernicus with enough surrounding terrain to maintain a sense of scale.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary Viewing:\u003c\/strong\u003e Jupiter, Saturn, and Mars remain in the field significantly longer in manual Dobsonian setups, reducing constant nudging and letting you focus on Jovian detail instead of tracking.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep Sky Contrast:\u003c\/strong\u003e The short focal length produces a very small exit pupil that darkens the sky background to the extreme, making subtle filaments in the Ring Nebula or the Eskimo Nebula stand out.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis is not a general purpose eyepiece. It is designed for nights when seeing supports high magnification and you want to extract maximum detail without switching to a narrow, restrictive 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\u003eWhen This Eyepiece Works Best\u003c\/h3\u003e\n\u003cp\u003eThe 4.7mm Ethos SX is only as good as your observing conditions and telescope setup. In steady seeing conditions, it becomes one of the most powerful visual tools available for resolving fine planetary and lunar structure. In average or turbulent seeing, the magnification will often exceed what the atmosphere can support, regardless of optical quality. In those conditions, a 6mm or 8mm Ethos will usually deliver a more consistent result.\u003c\/p\u003e\n\u003cp\u003eThis is why experienced observers treat the 4.7mm as a seeing dependent eyepiece rather than a daily use focal length. However, for owners of fast Newtonians or short focal length refractors, it often becomes the primary tool for high resolution work.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eHybrid Mounting and Optical Design\u003c\/h3\u003e\n\u003cp\u003eThe Ethos 4.7mm SX uses Tele Vue’s hybrid 2\" \/ 1.25\" barrel system, allowing it to integrate with a wide range of focusers and diagonals without adapters. Like all Tele Vue Ethos eyepieces, it uses advanced multi coatings and fully blackened internal surfaces to maintain contrast at high magnification, where optical imperfections become more noticeable.\u003c\/p\u003e\n\u003cp\u003eIn fast Newtonians, a Tele Vue Paracorr Type 2 is recommended to maintain pinpoint stars across the full 110° field, especially when observing bright planets or high contrast lunar detail. This ensures that the massive field of view is sharp from center to edge.\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 SX mean in the Ethos 4.7mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eSX stands for Super eXtended. It refers to the expanded 110° apparent field of view, which increases the usable field area by 21 percent compared to standard 100° Ethos models.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 4.7mm Ethos too much magnification for most telescopes?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn many 8\" SCTs and larger long focal length telescopes, 4.7mm produces very high magnification (over 400x) that is only usable during steady atmospheric conditions. In faster Newtonians or refractors, it falls into a more practical high power range of 200x to 250x.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 110° field help at high magnification?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt high power, narrow field eyepieces require constant tracking. The 110° field keeps objects in view much longer, especially in manual Dobsonians, making high magnification more comfortable and less demanding to use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat eye relief does it provide?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe eyepiece provides 15mm of eye relief, which is sufficient for most observers. For those with astigmatism, the 4.7mm Ethos SX is fully compatible with the Tele Vue Dioptrx corrector for sharp views without glasses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a Paracorr with this eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn fast Newtonians (around f\/4.5 or faster), a Paracorr Type 2 is recommended to correct mirror coma and maintain edge sharpness across the vast 110° field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel #\u003c\/td\u003e\n\u003ctd\u003eETH-04.7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e4.7 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\" \/ 1.25\" Hybrid\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e110°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e15 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e8.9 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.30 lb (20.8 oz \/ 590 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Compatibility\u003c\/td\u003e\n\u003ctd\u003eThreaded for 1.25\" and 2\" Filters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e53.3 x 147 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\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-SX-4_7mm-Eyepiece-1.jpg?v=1775101116\" alt=\"Ethos 4.7mm SX Eyepiece\" class=\"DAV-img-box\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eEthos 4.7mm SX 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\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-2inch-Dustcap.jpg?v=1774403118\" alt=\"Dust Cap\" class=\"DAV-img-box\"\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\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-2inch-Dustcap.jpg?v=1774403118\" alt=\"Dust Cap\" class=\"DAV-img-box\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap (Bottom)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-SX-Eyepieces-Manual.pdf?v=1775101962\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 512 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" 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\"\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\u003ca rel=\"noopener\" href=\"https:\/\/davidastro.com\/pages\/televue-warranty-policy\" target=\"_blank\"\u003e Tele Vue 5-Year Limited Warranty for Telescopes and Accessories \u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51110650511645,"sku":"TV-ETH-04.7","price":1043.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-SX-4_7mm-Eyepiece-1.jpg?v=1775101116"},{"product_id":"televue-ethos-sx-3-7mm-110-eyepiece","title":"TeleVue Ethos-SX 3.7mm 110° Eyepiece - 1.25\"\/2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e3.7mm Focal Length\u003c\/li\u003e\n\u003cli\u003e110° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" \/ 1.25\" Hybrid Barrel\u003c\/li\u003e\n\u003cli\u003e15mm Eye Relief\u003c\/li\u003e\n\u003cli\u003e7.0mm 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\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\u003eTeleVue Ethos 3.7mm SX 110° Eyepiece - 2\" \/ 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Ethos 3.7mm SX (Super eXtended) is the ultimate high-magnification specialist in the Ethos line. While most wide-field eyepieces sacrifice field of view as focal lengths get shorter, the 3.7mm SX does the opposite—expanding to a massive 110° Apparent Field of View. This provides 21 percent more viewing area than a 100° eyepiece, creating an unparalleled \"spacewalk\" experience even at the extreme magnifications required for the finest celestial details.\u003c\/p\u003e\n\u003cp\u003eThis eyepiece is engineered for the most demanding visual tasks. In most telescopes, the 3.7mm focal length pushes the limits of atmospheric seeing, making it a \"treasure hunter\" tool for those nights of perfect stability. The 7.0mm field stop is meticulously optimized to deliver maximum contrast, allowing you to resolve the tiniest features on the lunar surface or separate the closest double stars that other eyepieces might merge into a single blur.\u003c\/p\u003e\n\u003cp\u003eThe 110° field is a functional necessity at this power level. By providing such a vast window, the 3.7mm SX allows objects to remain in the field of view significantly longer in non-tracking telescopes, giving your eye the time it needs to wait for those moments of perfect clarity. It is parfocal with the 4.7mm Ethos SX, making it easy to swap when you need that final jump in resolution.\u003c\/p\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 Ultimate High-Resolution Tool\u003c\/h3\u003e\n\u003cp\u003eAt 3.7mm, you are accessing the top tier of your telescope's resolving power. The 110° field removes the \"tunnel vision\" usually felt at these magnifications, replacing it with an immersive vista that keeps you oriented within the star field.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar Prowess:\u003c\/strong\u003e Perfect for high-power exploration of rilles, dome structures, and the central peaks of craters like Tycho or Aristarchus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble Star Specialist:\u003c\/strong\u003e The extreme magnification and 110° field make it easier to split tight doubles while still seeing the surrounding star field for context.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact Deep Sky:\u003c\/strong\u003e Ideal for magnifying small planetary nebulae or the cores of globular clusters, where the tiny 0.3mm to 0.5mm exit pupil (depending on your scope) provides an inky black sky background.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis eyepiece excels in short focal length refractors and fast Newtonians, where it provides high resolution without the magnification becoming unusable due to atmospheric turbulence.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAtmospheric Limits and Performance\u003c\/h3\u003e\n\u003cp\u003eThe 3.7mm Ethos SX is a performance-first optic. Because it generates such high magnification, its performance is closely tied to the quality of your night sky. On nights of average seeing, the view may appear \"soft\" due to the atmosphere; however, on steady nights, this eyepiece will reveal details you simply cannot see with longer focal lengths.\u003c\/p\u003e\n\u003cp\u003eFor observers with large, fast Dobsonians, the 3.7mm SX often becomes the go-to choice for pushing the limits of the mirror's resolution. It provides the \"drift time\" necessary to observe comfortably without the constant, frantic nudging required by narrower 50° or 60° planetary 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\u003eHybrid Mounting and Professional Build\u003c\/h3\u003e\n\u003cp\u003eThe 3.7mm SX features the Tele Vue hybrid 2\" \/ 1.25\" barrel, ensuring it fits into almost any high-quality focuser or diagonal. To maintain the highest possible contrast at these power levels, Tele Vue utilizes advanced multi-coatings and internal baffling to eliminate stray light and ghosting.\u003c\/p\u003e\n\u003cp\u003eIn fast Newtonian systems (f\/4.5 or faster), using a Tele Vue Paracorr Type 2 is highly recommended. This ensures that the stars remain pinpoint sharp across the entire 110° field, allowing you to utilize every millimeter of that massive field stop for high-resolution observation.\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 3.7mm \"SX\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eSX stands for Super eXtended. It refers to the 110° apparent field of view, which is a 10° increase over the standard Ethos series, providing a 21 percent larger viewing area.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs 3.7mm too much magnification for my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a long focal length telescope like an 8\" f\/10 SCT, 3.7mm produces over 500x magnification, which is rarely usable. It is best suited for refractors (like an NP101) or fast reflectors (f\/4 to f\/5) where it provides a practical high-power range of 150x to 300x.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy use a 110° field for high power?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt high magnification, objects move across the field very quickly. The 110° field gives you significantly more \"drift time,\" meaning you spend more time observing the object and less time manually tracking or nudging your telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 3.7mm Ethos with glasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe eyepiece has 15mm of eye relief. While some eyeglass wearers may find it tight to see the full 110° field, the 3.7mm SX is fully compatible with Tele Vue Dioptrx for correcting astigmatism without needing glasses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 3.7mm Ethos SX parfocal with others?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is parfocal with the 4.7mm Ethos SX. When switching from other Ethos focal lengths like the 13mm or 8mm, a very small focus adjustment may be required.\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\u003eModel #\u003c\/td\u003e\n\u003ctd\u003eETH-03.7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e3.7 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\" \/ 1.25\" Hybrid\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e110°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e15 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e7.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.1 lb (17.6 oz \/ 500 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Compatibility\u003c\/td\u003e\n\u003ctd\u003eThreaded for 1.25\" and 2\" Filters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e53.3 x 147 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\u003cimg class=\"DAV-img-box\" alt=\"Ethos 3.7mm SX Eyepiece\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-SX-3_7mm-Eyepiece-1.jpg?v=1775102497\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eEthos 3.7mm SX 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\u003cimg class=\"DAV-img-box\" alt=\"Dust Cap\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-2inch-Dustcap.jpg?v=1774403118\"\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\u003cimg class=\"DAV-img-box\" alt=\"Dust Cap\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-2inch-Dustcap.jpg?v=1774403118\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap (Bottom)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-SX-Eyepieces-Manual.pdf?v=1775101962\" 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\u003ca href=\"https:\/\/davidastro.com\/pages\/televue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003e Tele Vue 5-Year Limited Warranty for Telescopes and Accessories \u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51110750388509,"sku":"TV-ETH-03.7","price":1043.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-SX-3_7mm-Eyepiece-1.jpg?v=1775102497"},{"product_id":"tele-vue-ethos-eyepiece-carry-bag","title":"Tele Vue Ethos Eyepiece Carry Bag","description":"","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223880270109,"sku":"TV-ETB-0020","price":251.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Ethos_Eyepiece_Carry_Bag_1.jpg?v=1777515022"}],"url":"https:\/\/davidastro.com\/collections\/televue-ethos-100-and-110-eyepieces.oembed","provider":"David Astro","version":"1.0","type":"link"}