{"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":700.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Ethos-8mm-Eyepiece-1.jpg?v=1775095288","url":"https:\/\/davidastro.com\/en-int\/products\/televue-ethos-8mm-100-eyepiece","provider":"David Astro","version":"1.0","type":"link"}