{"product_id":"askar-1x-full-frame-flattener-for-140apo","title":"Askar 1x Full-frame Flattener for the 140 APO - 140APO-FLAT","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/140APO-FLAT_Banner.jpg?v=1742924812\" alt=\"\" style=\"display: block; margin-left: auto; margin-right: auto;\"\u003e\u003c\/p\u003e\n\u003cp\u003eThis Askar 1X Full Frame Flattener is designed specifically for the 140APO.  It does not change the effective focal length of the telescope, which is f\/7, but it DOES further flatten the field, correcting for both field curvature and coma, to reveal fine star points to the edges of the field.  \u003c\/p\u003e\n\u003cp\u003eThe Askar 1X Flattener has a triplet design and supports a 44 mm image circle.  The telescope side has an M91*1 thread, and the camera side of the flattener has a built-in M48x0.75 (2\") thread to accept filters and comes with three adapters (M68*1, M54*0.75, and M48*0.75).  Both ends come with threaded metal caps to protect the optics when not in use.\u003c\/p\u003e\n\u003ch3\u003eSPECIFICATIONS\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eLens Design: \u003c\/strong\u003e Triplet\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBack Focus: \u003c\/strong\u003e 55 mm from base of M48 male threads\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTelescope Focal Length with Flattener Attached:\u003c\/strong\u003e  980 mm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTelescope Focal Ratio with Flattener Attached: \u003c\/strong\u003e f\/7\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCamera Side Thread Types:\u003c\/strong\u003e  M68*1, M54*0.75, M48*0.75\u003c\/p\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":41750077997169,"sku":"ASK-140APO-FLAT","price":295.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/askar-focal-reducer-askar-1x-full-frame-flattener-for-140apo-40252736602331.webp?v=1776459217","url":"https:\/\/khanscope.com\/fr-fr\/products\/askar-1x-full-frame-flattener-for-140apo","provider":"Khan Scope Centre","version":"1.0","type":"link"}