{"product_id":"21-0-ethos","title":"21.0 Ethos","description":"\u003cdiv\u003e\n\u003cp\u003eThe 21mm focal length completes the logical set of 21mm\/13mm\/8mm and nicely juxtaposes the 17mm\/10mm\/6mm combination. Each step within these two sets approaches a 3x field area gain. The 21mm's effective field stop diameter is 36.2mm, bringing its true field close to the 35mm Panoptic (38.7mm Field Stop diameter). In an f\/4 Dobsonian, the exit pupil is just 5.25mm using the 21mm Ethos instead of 8.75mm with a 35mm Panoptic.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ctable class=\"prodSpecTblEP\"\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 (mm)\u003c\/td\u003e\n\u003ctd\u003e21\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size (in.)\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View (deg.)\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief (mm)\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (lb \/ oz)\u003c\/td\u003e\n\u003ctd\u003e2.25 \/ 36.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diam. (mm)\u003c\/td\u003e\n\u003ctd\u003e36.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51374568866080,"sku":"ETH-21.0","price":1012.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/2135\/2480\/files\/image_5c1191d9-fc88-49e4-aab6-3c9ca5831d7a.jpg?v=1774415253","url":"https:\/\/firstlightastro.com\/products\/21-0-ethos","provider":"First Light Astro","version":"1.0","type":"link"}