{"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\u003e17.7 oz (1.1 lb \/ 500 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":745.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-10mm-Eyepiece-1.jpg?v=1775093396","url":"https:\/\/davidastro.com\/en-eu\/products\/televue-ethos-10mm-100-eyepiece","provider":"David Astro","version":"1.0","type":"link"}