{"product_id":"askar-f-3-9-reducer-for-fra400-refractor","title":"Askar f\/3.9 Reducer for FRA400 Refractor - FRA400-RED","description":"\u003cp\u003eEffectively reduce the 400 mm focal length of the Askar FRA400 astrograph to 280 mm by adding the dedicated Askar f\/3.9 Reducer to your imaging set-up!  The reduction factor of the full frame FRA400 reducer is 0.7X, and put another way, takes your f\/5.6 FRA400 refractor to a fast f\/3.9, cutting your exposure times in half!  Telescope side threads are M68x1 and the camera side has M48 x 0.75 threads that accept 2\" filters as well as a M48 T-ring or adapter.  Back focus is 55 mm from the M48 thread.\u003c\/p\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":39517221060721,"sku":"ASK-FRA400-RED","price":245.95,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/products\/FRA400_Reducer.png?v=1776459298","url":"https:\/\/khanscope.com\/en-fr\/products\/askar-f-3-9-reducer-for-fra400-refractor","provider":"Khan Scope Centre","version":"1.0","type":"link"}