{"product_id":"askar-0-74-reducer-for-111f-refractor-askar111fr","title":"Askar 0.74× Reducer for 111F Refractor (111FR)","description":"\u003ch1\u003eAskar 0.74× Reducer for 111F Refractor\u003c\/h1\u003e\n\u003cp class=\"e_text-102 s_title response-transition\"\u003eThe Askar 0.74× reducer, specially optimized for the Askar 111F, is designed to unlock a broader and more efficient deep-sky astrophotography experience.\u003c\/p\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg style=\"float: none;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/5d315ef5-b633-45ba-bf08-81d946c19cc7_1024x1024.jpg?v=1778257968\"\u003e\u003c\/div\u003e\n\u003cp\u003eThe 0.74× reducer brings the Askar 111F's focal ratio down to F5.1, delivering a faster optical system while incorporating built-in field-flattening correction to effectively eliminate field curvature - ensuring sharp and clear stars from the center to the very edges of the frame. The shorter focal ratio provides a wider field of view and shorter exposure times, making it particularly well-suited for capturing expansive nebulae, star clusters, and faint or fast-moving celestial objects.\u003c\/p\u003e\n\u003cp\u003eThe Askar 111F 0.74× Reducer features a triplet optical design and supports a 44mm full-frame image circle. Its back focus is 55mm (measured from the M48 thread), and both ends feature M68×1 threads for optimal adaptability and stability.\u003c\/p\u003e\n\u003cp\u003eThe 111F photographic extension tube includes M54×0.75 and M48×0.75 adapters, allowing for direct and convenient connection to the 111F 0.74× reducer. The reducer’s rear adapter ring features a built-in M48×0.75 standard 2-inch filter thread, enabling direct installation of various astronomical filters to accommodate different imaging needs.\u003c\/p\u003e\n\u003cp\u003eThe entire reducer is precision CNC-machined and comes with front and rear metal threaded caps to protect the optics from dust when not in use.\u003c\/p\u003e\n\u003ch4 class=\"e_text-102 s_title response-transition\"\u003eOptical Path Diagram\u003c\/h4\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg style=\"float: none;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1a8e1b6b-8c51-4525-b753-3ee73722e62e_1024x1024.webp?v=1778258192\"\u003e\u003c\/div\u003e\n\u003ch4 class=\"e_text-102 s_title response-transition\"\u003eSpot Diagram\u003c\/h4\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/f8145de5-dc89-42bc-a332-f4b7deacfff7_1024x1024.webp?v=1778258250\" alt=\"\" style=\"float: none;\"\u003e\u003c\/div\u003e\n\u003ch3 class=\"e_text-102 s_title response-transition\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\"\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e （After attaching）60F Focal length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e566mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e （After attaching）60F Focal ratio\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ef\/5.1\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLens Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eTriplet design\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBack Focus\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e55mm（from the base of M48 male thread）\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e0.5kg\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRear-end thread type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eM68*1\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp class=\"e_text-102 s_title response-transition\"\u003e \u003c\/p\u003e\n\u003ch4 class=\"e_text-102 s_title response-transition\"\u003eSize Diagram\u003c\/h4\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg style=\"float: none;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/0e1cb978-f3d5-4c9a-8429-9f624c17f5a1_1024x1024.webp?v=1778258130\"\u003e\u003c\/div\u003e\n\u003ch4 class=\"e_text-102 s_title response-transition\"\u003eInstallation\u003c\/h4\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg style=\"float: none;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2867ac9a-f6ea-40c3-bc6f-8722e38d4e4f_1024x1024.webp?v=1778258164\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3 class=\"e_text-102 s_title response-transition\"\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli class=\"e_text-102 s_title response-transition\"\u003eAskar 0.74× Reducer for 111F Refractor\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" href=\"https:\/\/astronomyplus.com\/pages\/askar-sharpstar-warranty\" target=\"_blank\"\u003eAskar Warranty\u003c\/a\u003e\u003c\/p\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":48994012954853,"sku":"ASK-111FR","price":419.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Untitled_6cee65b5-f3d9-49c5-b3c5-bf5748d7616a.png?v=1778258961","url":"https:\/\/astronomyplus.com\/products\/askar-0-74-reducer-for-111f-refractor-askar111fr","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}