{"product_id":"takahashi-reducer-c-0-72x-for-the-fs-60cb","title":"Takahashi Reducer-C 0.72x for FS-60CB and FS-60Q","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Reducer-C 0.72x is Takahashi's wide-field reducer for the FS-60 platform, dedicated to the FS-60CB, FS-60Q, and the earlier FS-60 models. On the FS-60CB it takes the native 355mm f\/5.9 down to roughly 255mm at f\/4.2, correcting a 40mm image circle at a fixed 56.2mm back focus. It weighs 180 g and adds 48 mm of length ahead of the sensor.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you own an FS-60CB or FS-60Q and want a faster, wider field for extended deep-sky exposures — nebula and Milky Way framing where the native focal length is already narrower than most refractors but you want it faster still.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.72x reduction:\u003c\/strong\u003e speeds up the FS-60CB from f\/5.9 to roughly f\/4.2 for wide-field imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e40mm corrected image circle\u003c\/strong\u003e at a fixed 56.2mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM56 x 0.75 input, M52 x 0.75 output:\u003c\/strong\u003e a compact 48mm-long in-line unit weighing 180 g.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect camera mounting:\u003c\/strong\u003e supports direct DSLR attachment via a brand-specific T-ring, or CMOS\/CCD cameras with a filter wheel.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FS-60 platform's native 355mm f\/5.9 (FS-60CB) is already a compact wide-field configuration; the Reducer-C 0.72x speeds it up further for shorter exposure times per unit of signal, at the cost of some focal length reach. Threaded between the drawtube's M56 x 0.75 female mount and an M52 x 0.75 camera-side output, the reducer holds a 40mm image circle and a fixed 56.2mm back focus, which is also published for the FS-60Q at its own native focal length.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TKA20580B_ReducerC_schema.png?v=1786913972\" alt=\"Dimensional diagram of the Takahashi Reducer-C 0.72x for FS-60CB\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWide-field nebula and Milky Way imaging on the FS-60CB or FS-60Q, and extended-exposure deep-sky work where a faster focal ratio shortens total integration time.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi dedicates this reducer to the FS-60 platform.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eNative\u003c\/th\u003e\n\u003cth\u003eWith Reducer-C 0.72x (calculated)\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFS-60CB\u003c\/td\u003e\n\u003ctd\u003e355mm f\/5.9\u003c\/td\u003e\n\u003ctd\u003e~256mm f\/4.2\u003c\/td\u003e\n\u003ctd\u003eΦ40mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFS-60Q\u003c\/td\u003e\n\u003ctd\u003e600mm f\/10.0\u003c\/td\u003e\n\u003ctd\u003e~432mm f\/7.2\u003c\/td\u003e\n\u003ctd\u003eΦ40mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThe FS-60CB figures are Takahashi's own stated result (f\/5.9 to f\/4.2). The FS-60Q figure is calculated from that same published 0.72x factor applied to its native focal length. For thread and spacing detail across your full imaging train, see the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eA separate option from Takahashi's other FS-60CB reducer:\u003c\/strong\u003e Takahashi also publishes the RD NC0.85x for the same tube; the 0.72x here is the faster, wider-field alternative, not a replacement for it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBuilt for imaging, not eyepiece use:\u003c\/strong\u003e the flattened, reduced field has no benefit for visual observing.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it threads onto the FS-60's M56 x 0.75 drawtube thread and presents a fixed M52 x 0.75 output, so the 56.2mm back focus is set by the part itself.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field, faster-ratio deep-sky imaging on the FS-60CB or FS-60Q.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I mount a DSLR directly?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — a brand-specific T-ring threads to the M52 x 0.75 output, or a CMOS\/CCD camera can be mounted with a filter wheel in between.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it also work on the FS-60Q?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTakahashi states it is dedicated to the FS-60CB, FS-60Q, and earlier FS-60 models; send us your exact tube and we will confirm the fit before you order.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Reducer-C 0.72x speeds the FS-60CB up to roughly f\/4.2 with a corrected 40mm image circle and a fixed 56.2mm back focus, at a compact 180 g.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047122063471,"sku":"TAK-TKA20580B","price":772.2,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka20580b_3.jpg?v=1786914460","url":"https:\/\/ontariotelescope.com\/products\/takahashi-reducer-c-0-72x-for-the-fs-60cb","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}