{"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\u003e1.0 lb (16 oz \/ 454 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":745.0,"currency_code":"USD","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","url":"https:\/\/davidastro.com\/en-eu\/products\/televue-ethos-sx-4-7mm-110-eyepiece","provider":"David Astro","version":"1.0","type":"link"}