{"product_id":"askar-fma230-50-mm-f-4-6-triplet-apo-refractor-fma230","title":"Askar FMA230 - 50 mm f\/4.6 Triplet APO Astrograph Lens - FMA230","description":"\u003cp style=\"text-align: left;\"\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/FMA230_Banner.jpg?v=1745272322\" alt=\"\"\u003e\u003c\/span\u003e\u003cspan\u003eThis \"three in the front and four in the back\" high quality 50 mm astrograph lens from Askar can support your imaging ambitions as well as perform nicely as a finder, guider, or for visual use.  The FMA230 includes an APO triplet lens system...two of which is made of ED glass!  This \u003c\/span\u003e\u003cspan\u003eallows for sharp images as well as contributing to greatly reduce chromatic aberration.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe removable 0.84x reducer contains four elements and is located at the rear of the lens.  It takes the base focal length of the FMA230 from 275 mm to 230 mm, and the f\/ratio is lowered to f\/4.6 from f.5.5. \u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Askar FMA230 has male M42x0.75 male threads on the rear of the lens that will work for most astronomy cameras as well as DSLR's with the manufacturer-specific adapter (sold separately).  Back focus is 55 mm.  A 2\" adapter allows for the insertion of eyepieces and other barrel-type accessories.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe FMA230 comes with some nice accessories.  You will receive a tube ring, \u003c\/span\u003ehandle with slot for finders, etc., Vixen-style dovetail plate, and, as mentioned above, a 2\" receptacle that will accept 2\" barreled accessories.  A 1.25\" adapter is not included, but recommended for 1.25\" barreled accessories such as eyepieces, diagonals, etc.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/FMA230_WITB.jpg?v=1745272212\" alt=\"\" style=\"display: block; margin-left: auto; margin-right: auto;\"\u003e\u003c\/p\u003e\n\u003ch3 class=\"e_h3-18 s_summary\"\u003eSpecifications\u003c\/h3\u003e\n\u003cdiv class=\"e_richText-17 s_title clearfix response-transition\"\u003e\n\u003ctable align=\"center\" cellspacing=\"0\" width=\"84.20%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e\n\u003cp\u003e\u003cstrong\u003eFMA230\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eAperture size\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e50mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eFocal length\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e275mm\u003cbr\u003e230mm（with the reducer）\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eFocal ratio\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003ef\/5.5\u003cbr\u003ef\/4.6（with the reducer）\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eObjective lens\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003eTriplet air-spaced APO with two ED elements\u003cbr\u003eSeptuplet full-frame astrograph（including the reducer）\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eLength\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e239mm（imaging with the reducer）\u003cbr\u003e240mm（observing without a diagonal）\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eTotal Weight (Including tube ring\u0026amp;dovetail plate）\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e1200g\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eRear-end thread type\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003eM48×0.75（for imaging）\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e2\" Adapter（for observation）\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003ePackage items\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003eAn FMA230 astrograph, a pair of tube rings, a Vixen-style dovetail plate, handle, 2\" adapter, a manual\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":41814890479729,"sku":"ASK-FMA230","price":626.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/FMA230_Left.png?v=1776459031","url":"https:\/\/khanscope.com\/fr-fr\/products\/askar-fma230-50-mm-f-4-6-triplet-apo-refractor-fma230","provider":"Khan Scope Centre","version":"1.0","type":"link"}