{"product_id":"takahashi-multi-reducer-0-85x-s-short","title":"Takahashi Multi-Reducer 0.85x-S for FS-60 Series","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe S version of Takahashi's 0.85x Multi-Reducer, matched to the \u003cstrong\u003eFS-60 series\u003c\/strong\u003e: the FS-60CB, FS-60CBX, FS-60CP, FS-60Q and FS-60C. Behind those tubes it gives \u003cstrong\u003e300 mm at f\/5.0\u003c\/strong\u003e with a Ø44 mm image circle — full-frame coverage from a 60 mm refractor.\u003c\/p\u003e\u003cp\u003eThe Multi-Reducer comes in three versions, and the letter is not a size preference — it identifies which telescope family the reducer is computed for. S is the FS-60 series; M is the FCT-65D and FC-50; L is the FC-76 and FC-60\/65 series.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you image with an FS-60-series refractor and want a faster, wider system without giving up corner quality.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e300 mm at f\/5.0:\u003c\/strong\u003e the resulting configuration on an FS-60 tube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eØ44 mm image circle:\u003c\/strong\u003e covers a full-frame sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour elements in three groups:\u003c\/strong\u003e a substantial optical design for a reducer of this size.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eM55.9 (P=0.75) telescope side, M52 (P=0.75) camera side.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eØ60 × 55.8 mm, approx. 215 g.\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA 0.85x reduction takes 15% off the focal length and speeds the focal ratio to match — a modest change compared with a 0.6x or 0.7x reducer, and one that keeps the image scale usable rather than collapsing it. The four-element, three-group design is what holds the Ø44 mm circle: it is correcting field curvature across a full-frame sensor at the same time as reducing, which a simpler two-element design would not manage at this speed.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWide-field deep-sky imaging on an FS-60: large nebulae, star fields, and framing that benefits from the extra field and the shorter exposures.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi computes this version for the \u003cstrong\u003eFS-60CB, FS-60CBX, FS-60CP, FS-60Q and FS-60C\u003c\/strong\u003e. The threads are M55.9 (P=0.75) on the telescope side and M52 (P=0.75) on the camera side. If your telescope is not an FS-60, one of the other two versions is the one you want — the M covers the FCT-65D and FC-50, the L covers the FC-76 series. We stock all three; tell us your telescope and camera and we will confirm the version and the spacing.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eThe letter identifies the telescope, not the length:\u003c\/strong\u003e S, M and L all reduce by 0.85x. Ordering by telescope model rather than by size is the way to get the right one.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAn imaging corrector:\u003c\/strong\u003e designed for a camera at the focal plane rather than an eyepiece.\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 into the train on M55.9 at the telescope and M52 at the camera. Once you have the right version for your tube, the rest is straightforward.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat will my FS-60 become?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e300 mm at f\/5.0.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it cover a full-frame camera?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — Ø44 mm image circle.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know I need the S rather than the M or L?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe S is computed for the FS-60 series. If you have an FCT-65D or an FC-76, you want a different version, and we will confirm it for you.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FS-60 version of Takahashi's 0.85x Multi-Reducer — 300 mm at f\/5.0 over a full-frame field.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54086044811375,"sku":"TAK-TKA00580S","price":676.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka00580s-1.jpg?v=1787328916","url":"https:\/\/ontariotelescope.com\/products\/takahashi-multi-reducer-0-85x-s-short","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}