{"product_id":"tele-vue-21mm-ethos-eyepiece-2-eth-21-0-pre-owned","title":"Tele Vue 21mm Ethos Eyepiece - 2\" - ETH-21.0 (Pre-Owned)","description":"\u003cp\u003e\u003cspan style=\"color: rgb(249, 16, 16);\"\u003e\u003cstrong\u003eIn Mint Condition!\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(249, 16, 16);\"\u003e\u003cstrong\u003eBox Not Included\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ccenter\u003e\n\u003ch3\u003eAbout the TeleVue 21mm Ethos Eyepiece - 2\"...\u003c\/h3\u003e\n\u003c\/center\u003e\n\u003cp\u003eTele Vue is known for its in-house \u003ca href=\"http:\/\/khanscope.com\/accessDetails.cfm?productID=5224\"\u003etelescope eyepiece\u003c\/a\u003e and \u003ca href=\"http:\/\/khanscope.com\/newEquipList.cfm?catID=1\u0026amp;subCatID=1\u0026amp;manID=7\"\u003eTeleVue Telescope\u003c\/a\u003e designs by Al Nagler; and their latest \u003ca href=\"http:\/\/khanscope.com\/accessDetails.cfm?productID=5224\"\u003eTeleVue Telescope Eyepiece\u003c\/a\u003e brings new meaning to the term \"in-house.\" The concept for this \u003ca href=\"http:\/\/khanscope.com\/accessDetails.cfm?productID=5224\"\u003eTeleVue Telescope Eyepiece\u003c\/a\u003e series was proposed by Tele Vue President David Nagler, with performance parameters giving it the fundamental characteristics (the ethos) of a \u003ca href=\"http:\/\/khanscope.com\/accessDetails.cfm?productID=5224\"\u003eTeleVue Telescope Eyepiece\u003c\/a\u003e: high contrast, comfortable eye relief and full field sharpness. Control of astigmatism, field curvature, lateral color, angular magnification distortion correction, and low pupil sensitivity for daytime use were specified criteria and a hallmark of the \u003cb\u003eTeleVue Ethos Eyepiece\u003c\/b\u003e design.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eFollowing Tele Vue'''s philosophy of pushing the state of the art, long-time Tele Vue employee and optical design protege Paul Dellechiaie took up the challenge and designed the basic \u003ca href=\"http:\/\/khanscope.com\/accessDetails.cfm?productID=5224\"\u003eTeleVue Telescope Eyepiece\u003c\/a\u003e form. Under Al'''s guidance, Paul tweaked his design of the \u003cb\u003eTeleVue Ethos Eyepiece\u003c\/b\u003e to fulfill the original goals. While sharpness is inherent to the optical design, contrast is maximized through the intelligent use of flat finished baffles and ultra low reflectance, high efficiency coatings tuned to the composition of each element.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eIntroduced at the 2007 Northeast Astronomy Forum, Tele Vue once again broadened the amateur astronomer'''s perspective on the universe with: 100 degrees of pure Tele Vue quality. The field area of this new eyepiece is more than 50% larger than an 82 degree field. The \u003cb\u003eTele Vue Ethos Eyepiece\u003c\/b\u003e is essentially multiple \u003ca href=\"http:\/\/khanscope.com\/accessDetails.cfm?productID=5224\"\u003etelescope eyepieces\u003c\/a\u003e, delivering the true field size of a longer focal length, narrower apparent field \u003ca href=\"http:\/\/khanscope.com\/accessDetails.cfm?productID=5224\"\u003eTeleVue Telescope Eyepiece\u003c\/a\u003e with the benefits of higher power and darker sky background.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eBe sure to check out our line of \u003ca href=\"http:\/\/khanscope.com\/newEquipList.cfm?catID=1\u0026amp;subCatID=1\u0026amp;manID=7\"\u003eTeleVue Telescopes\u003c\/a\u003e, \u003ca href=\"http:\/\/www.khanscope.com\/accessList.cfm?catID=3\u0026amp;subcatID=13\"\u003eTeleVue Telescope Mounts\u003c\/a\u003e and \u003ca href=\"http:\/\/www.khanscope.com\/accessList.cfm?catID=3\u0026amp;subcatID=15\"\u003eTeleVue Telescope Accessories\u003c\/a\u003e. Don'''t forget \u003ca href=\"http:\/\/khanscope.com\/accessDetails.cfm?productID=5224\"\u003eTeleVue Telescope Eyepieces\u003c\/a\u003e, \u003ca href=\"http:\/\/khanscope.com\/accessDetails.cfm?productID=5224\"\u003eTeleVue Dioptrx\u003c\/a\u003e and \u003ca href=\"http:\/\/www.khanscope.com\/accessList.cfm?catID=3\u0026amp;subcatID=10\"\u003eTeleVue Eyepiece Filters\u003c\/a\u003e, too!\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ccenter\u003e\n\u003ch2\u003eTeleVue 21mm Ethos Eyepiece - 2\" Features...\u003c\/h2\u003e\n\u003c\/center\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eA comfortable 15mm of eye relief and an amazing 100 degree field of view!\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003eContrast is maximized through the intelligent use of flat finished baffles\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003eUltra low reflectance, high efficiency coatings tuned to the composition of each element\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003eDelivers the true field size of a longer focal length, narrower apparent field eyepiece with the benefits of higher power and darker sky background\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003eControl of astigmatism, field curvature, lateral color, angular magnification distortion correction, and low pupil sensitivity for daytime use\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003eHigh contrast, impressive eye relief and full field sharpness\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ccenter\u003e\n\u003ch2\u003eTeleVue 21mm Ethos Eyepiece - 2\" Specifications...\u003c\/h2\u003e\n\u003c\/center\u003e\n\u003cp\u003eFocal Length (mm): 21\u003c\/p\u003e\n\u003cp\u003eBarrel Size (in.) : 2\"\u003c\/p\u003e\n\u003cp\u003eApparent Field of View (deg.): 100\u003c\/p\u003e\n\u003cp\u003eEye Relief (mm): 15\u003c\/p\u003e\n\u003cp\u003eWeight (lb \/ oz): 2.25 \/ 36.0\u003c\/p\u003e\n\u003cp\u003eField Stop (mm): 36.2\u003c\/p\u003e\n\u003cp\u003eWarranty: Limited Lifetime\u003c\/p\u003e\n\u003cp\u003eTeleVue Product Number: ETH-21.0\u003c\/p\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":43437313458289,"sku":"USED061011","price":1135.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/20260610_144117.jpg?v=1781117068","url":"https:\/\/khanscope.com\/products\/tele-vue-21mm-ethos-eyepiece-2-eth-21-0-pre-owned","provider":"Khan Scope Centre","version":"1.0","type":"link"}