{"product_id":"starfield-0-8x-adjustable-2-5-reducer-sf-ffra-08-2-5","title":"StarField 0.8X Adjustable Reducer Corrector for 102 mm - 155 mm Refractors - SF-FFRA-08-L","description":"\u003cul\u003e\n\u003cli\u003e2.5\" Adjustable 0.8x Reducer Corrector\u003c\/li\u003e\n\u003cli\u003e3 Element ED lens design\u003c\/li\u003e\n\u003cli\u003eAdjustable to reach 55mm with no adapters\u003c\/li\u003e\n\u003cli\u003eAdjustable Distance Range - 0-17 mm stepless\u003c\/li\u003e\n\u003cli\u003eDesigned for 102mm - 155mm telescopes with 2.5\" or larger focusers\u003c\/li\u003e\n\u003cli\u003eM63x1 external thread - telescope side\u003c\/li\u003e\n\u003cli\u003eM48x0.75 external thread - camera side\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eThe Starfield 0.8x adjustable Reducer Corrector makes finding the correct back focus easy!  Fighting with adapters is a thing of the past! \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBy setting the adjustment to 14.87mm with the scale, achieving 55mm of back focus is simple, and if more adjustment is needed for fine tuning all that is needed is a small twist.    If you are using accessories such as filter wheels and rotators you can  still get the required back focus.   Just add up the thickness of all the accessories, plus the distance to your sensor and subtract from 69.87.  Then set the reducer to the number that is calculated.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe reducer attaches directly to the ED102 telescope focuser by removing the Axil lock.  Using a 1.5mm Allen key, loosen the three screws a half turn and then unscrew the lock.  Thread the reducer onto the focuser.   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThis Starfield Adjustable Reducer can also be used for other telescopes larger than 102mm.  As long as the telescope has at least a 2.5\" focuser and isn't larger than 155 mm, you should be fine! \u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e102 mm with focal ratio of f\/7 - 69.87 mm\u003c\/li\u003e\n\u003cli\u003e107 mm with focal ratio of f\/6.5 - 69.0 mm\u003c\/li\u003e\n\u003cli\u003e130 mm\u003cmeta charset=\"UTF-8\"\u003e\n\u003cspan data-mce-fragment=\"1\"\u003e with \u003c\/span\u003efocal ratio\u003cmeta charset=\"UTF-8\"\u003e\n\u003cspan data-mce-fragment=\"1\"\u003e of \u003c\/span\u003e f\/7 - 66.17 mm\u003c\/li\u003e\n\u003cli\u003e140 mm\u003cmeta charset=\"UTF-8\"\u003e\n\u003cspan data-mce-fragment=\"1\"\u003e with \u003c\/span\u003efocal ratio\u003cmeta charset=\"UTF-8\"\u003e\n\u003cspan data-mce-fragment=\"1\"\u003e of \u003c\/span\u003e f\/6.5 - 65.8 mm\u003c\/li\u003e\n\u003cli\u003e150 mm\u003cmeta charset=\"UTF-8\"\u003e\n\u003cspan data-mce-fragment=\"1\"\u003e with \u003c\/span\u003efocal ratio\u003cmeta charset=\"UTF-8\"\u003e\n\u003cspan data-mce-fragment=\"1\"\u003e of \u003c\/span\u003e f\/8 - 63.34 mm\u003c\/li\u003e\n\u003cli\u003e155 mm\u003cmeta charset=\"UTF-8\"\u003e\n\u003cspan data-mce-fragment=\"1\"\u003e with \u003c\/span\u003efocal ratio\u003cmeta charset=\"UTF-8\"\u003e\n\u003cspan data-mce-fragment=\"1\"\u003e of \u003c\/span\u003e f\/8 - 62.57 mm\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"StarField Optics","offers":[{"title":"Default Title","offer_id":39768812912753,"sku":"SFO-SF-FFRA-08-L","price":227.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/products\/ED102_2_5_Adj_Reducer.jpg?v=1776459236","url":"https:\/\/khanscope.com\/en-fr\/products\/starfield-0-8x-adjustable-2-5-reducer-sf-ffra-08-2-5","provider":"Khan Scope Centre","version":"1.0","type":"link"}