{"title":"Takahashi FC \u0026 FS","description":"\u003cp\u003eThe Takahashi FC \u0026amp; FS line, listed by aperture. Part of \u003ca href=\"\/collections\/takahashi-telescopes\"\u003eTakahashi Telescopes\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"takahashi-fs-60cb-60mm-f5-9-fluorite-refractor-ota","title":"Takahashi FS-60CB 60mm f\/5.9 Fluorite Doublet Apochromatic Refractor OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FS-60CB is Takahashi's 60 mm fluorite doublet apochromat, built in Tokyo and sold here as an optical tube assembly. At 355 mm focal length and f\/5.9 it is a short, light instrument — 413 mm long, 80 mm across the tube, and 1.1 kg — which puts it within reach of almost any tracking mount, including small travel heads and star trackers.\u003c\/p\u003e\u003cp\u003eWhat separates it from other 60 mm refractors is that the tube is a platform rather than a fixed configuration. The rear cell accepts a field flattener, a 0.85x focal reducer, or a 1.7x extender, and each one changes the telescope's working focal length and field. The same tube covers 300 mm at f\/5.0 for wide-field imaging, 370 mm at f\/6.2 with a flat 44 mm corrected circle, and 600 mm at f\/10 for lunar and planetary work.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you want a small, genuinely apochromatic refractor that travels well and can be reconfigured rather than replaced. Wide-field imagers use it reduced, at 300 mm and f\/5.0, to frame large emission nebulae on an APS-C sensor. Visual observers use it at prime focus or extended for lunar detail and double stars. Eclipse chasers take it because it fits in a carry-on and holds focus in changing temperature.\u003c\/p\u003e\u003cp\u003eIt also works as a guide scope or a second imaging tube alongside a larger instrument, and as a high-quality daytime spotting scope with a diagonal and eyepiece.\u003c\/p\u003e\u003cp\u003eIf you are buying your first telescope and want one box that works out of the box, this is not that — it is an OTA, and you will be choosing a mount, a diagonal and an eyepiece alongside it. Tell us how you plan to use it and we will put the pieces together with you.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir-spaced fluorite doublet:\u003c\/strong\u003e two elements in two groups, with a genuine fluorite crystal element rather than an ED-glass substitute.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHard multicoatings:\u003c\/strong\u003e applied to the fluorite surfaces, which are softer and more hygroscopic than glass and need the protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e355 mm at f\/5.9:\u003c\/strong\u003e a 60 mm aperture in a 413 mm tube — short enough to balance on a light mount, long enough to reach useful magnification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e162 mm of back focus:\u003c\/strong\u003e generous rear spacing, which is what allows the flattener, reducer and extender modules to fit without running out of focus travel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRack-and-pinion focuser\u003c\/strong\u003e with 30 mm of drawtube extension.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e80 mm dew shield:\u003c\/strong\u003e retracts over the tube for transport.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.1 kg:\u003c\/strong\u003e light enough that mount payload is rarely the limiting factor.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe objective is a two-element air-spaced doublet built around a fluorite crystal element. Fluorite has anomalous partial dispersion that ordinary optical glass cannot reproduce, and in a doublet it brings the red, green and blue focal points close enough together that secondary spectrum is not the limiting factor at this aperture. In practice that means clean white stars and no violet fringing on the lunar limb or on bright planets — the failure mode that defines cheaper short refractors.\u003c\/p\u003e\u003cp\u003eBecause fluorite is softer and more sensitive to moisture than glass, Takahashi applies hard multicoatings to the exposed surfaces. These also cut internal reflections, which matters when the target is a bright object against a dark field.\u003c\/p\u003e\u003cp\u003eThe 162 mm of back focus is the design decision that makes the FS-60CB modular. Most short refractors leave just enough room for a camera and nothing else. The extra rear space here is what lets a 0.85x reducer, a 1.04x flattener or a 1.7x extender sit in the light path and still reach focus — so one tube covers f\/5.0 through f\/10.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide-field deep-sky imaging:\u003c\/strong\u003e with the 60C RD NC 0.85x reducer at 300 mm and f\/5.0, covering a 44 mm image circle — large nebulae, the Andromeda field, wide Milky Way regions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat-field imaging at prime focus:\u003c\/strong\u003e with the FC\/FS MFL 1.04x flattener at 370 mm and f\/6.2, corrected across 44 mm — full-frame coverage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar and planetary:\u003c\/strong\u003e with the EX CQ 1.7x extender at 600 mm and f\/10, which is the FS-60Q configuration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolar eclipse work:\u003c\/strong\u003e short, light, and quick to set up on a travel mount, with a suitable solar filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing:\u003c\/strong\u003e open clusters, double stars, lunar detail and bright planets with a diagonal and eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuiding and dual-rig imaging:\u003c\/strong\u003e as a second tube beside a larger instrument.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FS-60CB has a published system chart — included in the Downloads tab — that names every adapter, ring and spacer for each configuration, along with the exact distances. It is the fastest way to confirm a train before ordering, and it removes the guesswork that usually surrounds backfocus. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e collects the same figures for the whole range in one table.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus:\u003c\/strong\u003e 162 mm at prime focus, measured from the rear end of the focuser to the focal plane.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField flattener:\u003c\/strong\u003e the FC\/FS MFL 1.04x needs the CA-60C ring (Takahashi part TKA20203) on this telescope, and gives 370 mm at f\/6.2 with a 44 mm corrected circle at 87.5 mm of back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal reducer:\u003c\/strong\u003e the 60C RD NC 0.85x brings the tube to 300 mm at f\/5.0 with a 44 mm corrected circle at 56.0 mm of back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtender:\u003c\/strong\u003e the EX CQ 1.7x converts the tube to the FS-60Q configuration — 600 mm at f\/10, 44 mm circle, 158.4 mm of back focus. The EX-C2X and EX-Q extenders each have their own system chart, both included below.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual train:\u003c\/strong\u003e a 1.25-inch or 2-inch diagonal and eyepiece attach through the matching Takahashi visual adapter. The Takahashi 1.25-inch prism diagonal is a direct fit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA — no mount, rings or dovetail are included. At 1.1 kg the tube suits small equatorial and travel mounts once a camera or diagonal is added.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinder and rings:\u003c\/strong\u003e tube rings, a dovetail plate and a finder bracket are separate purchases. Takahashi recommends a 6x30 finder for this tube.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you are not sure which corrector and ring combination your camera needs, send us your camera model, filter thickness and any spacers you already own and we will work the train out with you before you order.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is an optical tube assembly.\u003c\/strong\u003e Mount, tripod, tube rings, dovetail, diagonal, eyepiece and finder are all sold separately. We can quote a complete setup if that is easier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA flat field needs a corrector.\u003c\/strong\u003e At prime focus the field curves, as it does on any short doublet. The FC\/FS MFL 1.04x flattens it to 44 mm; the 60C RD NC 0.85x reducer flattens and shortens at once.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe flattener needs its own CA ring.\u003c\/strong\u003e On the FS-60CB that is the CA-60C (TKA20203). The system chart in the Downloads tab lists the part for every configuration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorite needs ordinary care.\u003c\/strong\u003e The coatings protect it, and the retractable dew shield helps in dew. Standard optical cleaning practice is all it asks for.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e60 mm is 60 mm.\u003c\/strong\u003e It resolves and gathers light like a 60 mm aperture, and its strength is field, portability and colour correction rather than reach on faint galaxies.\u003c\/li\u003e\n\u003c\/ul\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. At prime focus it is a diagonal and an eyepiece and you are observing. Imaging trains take more thought because the spacing matters, and Takahashi publishes a system chart for every configuration — it is in the Downloads tab, and it names the parts and distances so there is no trial and error. Send us your camera details and we will confirm the train with you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field imaging and portable visual work. Reduced to 300 mm at f\/5.0 it frames large nebulae; extended to 600 mm at f\/10 it shows lunar and planetary detail. Few telescopes cover that range without swapping tubes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for astrophotography without buying anything else?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYou can attach a camera at prime focus, but the field will curve at the edges. For flat stars across an APS-C or full-frame sensor you need the flattener and its CA ring, or the 0.85x reducer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the FS-60CB and the FS-60Q?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe FS-60Q is the FS-60CB with the EX CQ 1.7x extender module fitted — 600 mm at f\/10 instead of 355 mm at f\/5.9. Buying the CB and adding the extender later reaches the same place.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work on a star tracker?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAt 1.1 kg it is within range of the larger travel trackers once a camera is attached, though the total load and the tracker's rated capacity are worth checking together. Tell us which tracker you have and we will confirm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs fluorite better than ED glass?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFluorite is a crystal, not a glass, and its dispersion behaviour is what a two-element design needs to control colour. It is why this doublet performs like designs that otherwise take three elements. It is also softer, which is why the coatings matter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it come with a case?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — the OTA ships without a case.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 60 mm fluorite apochromat at 355 mm and f\/5.9 that reconfigures to 300 mm at f\/5.0 or 600 mm at f\/10, weighs 1.1 kg, and comes with published system charts for every one of those configurations. Add a mount, a corrector matched to your camera, and it covers wide-field imaging through planetary detail from one tube.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54046912643183,"sku":"TAK-TSK06210\/TSK06010","price":1143.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/fs-60cb_1_2_3.jpg?v=1786907612"},{"product_id":"takahashi-fs-60cp-60mm-f-5-9-fluorite-doublet-apochromatic-refractor-ota","title":"Takahashi FS-60CP 60mm f\/5.9 Fluorite Doublet Apochromatic Refractor OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FS-60CP is Takahashi's fixed-tube 60 mm fluorite doublet apochromat, built around the same objective as the FS-60CB but housed in a longer, 95 mm-diameter tube with a permanently mounted camera angle adjuster. At 355 mm focal length and f\/5.9 it shares the CB's optical formula and most of its conversion-lens options, but the longer tube gives it 197.8 mm of back focus at prime focus — well over the CB's 162 mm — which is what lets it run Takahashi's newer FU-series reducer without running out of drawtube travel. Attach the 60CP FURD 0.65x reducer and it becomes a 230 mm f\/3.8 astrograph.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you already know you want a wide-field imaging platform and would rather buy the longer-backfocus tube outright than add a spacer later. It suits imagers running the FU reducer for fast, flat fields, and anyone assembling a permanent imaging rig rather than a travel kit that gets reconfigured on site. It is less suited to observers who want the shortest, most collapsible package — the FS-60CB's retractable dew shield is the better fit there.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir-spaced fluorite doublet:\u003c\/strong\u003e the same two-element, two-group objective used in the FS-60CB — a genuine fluorite crystal element, not an ED-glass substitute.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e355 mm at f\/5.9:\u003c\/strong\u003e 60 mm aperture, native prime-focus figures identical to the CB.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e197.8 mm of back focus:\u003c\/strong\u003e a fixed 95 mm tube gives substantially more rear clearance than the CB's 162 mm, built for reducer and flattener use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera angle adjuster:\u003c\/strong\u003e built into the rear cell, for rotating framing without disturbing focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e63 mm drawtube extension\u003c\/strong\u003e on a rack-and-pinion focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.8 kg:\u003c\/strong\u003e heavier than the CB by the length of tube, still light for most imaging mounts.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe objective is the same two-element, air-spaced fluorite doublet used across the FS-60 line — fluorite's anomalous partial dispersion pulls the red, green and blue focal points close enough together that a two-element design performs like a more complex triplet at this aperture, without the violet fringing that limits ordinary short achromats. Hard multicoatings protect the fluorite surface and cut internal reflections.\u003c\/p\u003e\u003cp\u003eWhat distinguishes the CP from the CB is the tube itself, not the glass. The 95 mm barrel is fixed rather than telescoping, and the extra length shifts the back focus out to 197.8 mm at prime focus — room enough for the 60CP FURD 0.65x reducer to reach focus, a part specified for this tube's back focus and not interchangeable with the CB's reducer. Takahashi notes that focus to infinity is not available in the base configuration without the correct diagonal or extension in the visual train, worth checking against the eyepiece setup you plan to use.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast wide-field imaging:\u003c\/strong\u003e with the 60CP FURD 0.65x reducer at 230 mm and f\/3.8, for large nebulae and wide star fields.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat-field imaging at prime focus:\u003c\/strong\u003e with the FC\/FS MFL 1.04x flattener at 370 mm and f\/6.2, corrected across a 44 mm circle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced-field imaging:\u003c\/strong\u003e with the 60C RD NC 0.85x reducer at 300 mm and f\/5.0.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing:\u003c\/strong\u003e lunar, double-star and wide-field work with a diagonal and eyepiece, keeping the infinity-focus note above in mind.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FS-60CB and FS-60CP share the flattener and 0.85x reducer, but the 60CP FURD 0.65x reducer is built specifically for the CP's longer back focus and is a different part from the CB's reducer. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e lists the figures for both tubes side by side, which is the fastest way to confirm a train before ordering.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus:\u003c\/strong\u003e 197.8 mm at prime focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField flattener:\u003c\/strong\u003e FC\/FS MFL 1.04x — 370 mm, f\/6.2, 44 mm circle, 87.5 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal reducer:\u003c\/strong\u003e 60C RD NC 0.85x — 300 mm, f\/5.0, 44 mm circle, 56.0 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFU reducer:\u003c\/strong\u003e 60CP FURD 0.65x — 230 mm, f\/3.8, 44 mm circle, 56.0 mm back focus measured from the rear of the adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA — no mount, rings or dovetail included.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you are not sure which reducer or CA ring your camera needs, send us your camera and filter setup and we will work it out with you.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is an optical tube assembly.\u003c\/strong\u003e Mount, tripod, rings, dovetail, diagonal, eyepiece and finder are sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocus to infinity needs the right visual train.\u003c\/strong\u003e Takahashi notes the base configuration does not reach infinity focus without the correct extension tube or diagonal in place — worth checking against the eyepiece or diagonal you plan to use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe CP's FU reducer is model-specific.\u003c\/strong\u003e The 60CP FURD 0.65x is built for this tube's back focus and is a different part from the CB's reducer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA flat field needs a corrector.\u003c\/strong\u003e At prime focus the field curves; the flattener or reducer corrects it.\u003c\/li\u003e\n\u003c\/ul\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 — at prime focus it is a diagonal and eyepiece, or a camera and the appropriate spacer. The one detail worth checking ahead of time is the visual train reaching infinity focus, which depends on the diagonal or extension used; tell us your setup and we will confirm it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the FS-60CB and FS-60CP?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSame objective and focal length, different tube. The CP's fixed 95 mm barrel gives 197.8 mm of back focus against the CB's 162 mm, and that extra room is what the FU reducer needs to reach focus.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field imaging, particularly with the FU reducer at f\/3.8, where the extra back focus over the CB matters most.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it need a flattener for astrophotography?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAt prime focus, yes, for a flat field to the edge — the MFL 1.04x flattener or the 0.85x\/0.65x reducers each correct it differently.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use FS-60CB accessories on this tube?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe flattener and 0.85x reducer are shared. The FU reducer is specific to the CP's back focus and is a separate part from the CB's reducer.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 60 mm fluorite apochromat at 355 mm and f\/5.9, built into a fixed 95 mm tube with 197.8 mm of back focus for reducer and flattener work — and a 230 mm f\/3.8 astrograph once the FU reducer is attached.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047051382895,"sku":"TAK-TSK06410","price":1396.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tsk06410-1.jpg?v=1786911768"},{"product_id":"takahashi-fs-60q-60mm-f-10-fluorite-quadruplet-refractor-ota","title":"Takahashi FS-60Q 60mm f\/10 Fluorite Quadruplet Refractor OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FS-60Q is Takahashi's long-focal-length version of the FS-60 platform — the same 60 mm fluorite doublet as the FS-60CB, but with the EX CQ 1.7x extender permanently built into the optical path as a third and fourth element. The result is a 4-element, 3-group apochromat running natively at 600 mm and f\/10, in a 550 mm tube weighing 1.4 kg. Where the CB is bought and reconfigured, the Q is bought already set up for reach.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you know you want the longer focal length rather than a modular tube you configure yourself — lunar and planetary observers who want more image scale from a 60 mm aperture, and imagers targeting smaller, brighter deep-sky objects where 600 mm suits the framing. It suits anyone who wants one dedicated configuration rather than swapping reducers and extenders between sessions.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorite quadruplet:\u003c\/strong\u003e four elements in three groups — the FS-60 doublet plus a built-in 1.7x extender group, rather than a separate accessory.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e600 mm at f\/10:\u003c\/strong\u003e native focal length and ratio, with a 44 mm corrected image circle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e158.4 mm of back focus:\u003c\/strong\u003e ample room for a diagonal, filter wheel or imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRack-and-pinion focuser\u003c\/strong\u003e with 30 mm of drawtube extension.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e80 mm dew shield\u003c\/strong\u003e over an 80 mm tube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.4 kg:\u003c\/strong\u003e light enough for small equatorial and travel mounts even at this focal length.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe front two elements are the same air-spaced fluorite doublet used in the FS-60CB, and Takahashi has permanently mated the CQ 1.7x extender group behind it rather than leaving it as a separate accessory. That turns a 355 mm f\/5.9 doublet into a 600 mm f\/10 quadruplet with a corrected 44 mm image circle — image scale and reach that a 60 mm objective does not otherwise offer, without the secondary-spectrum penalty a plain Barlow would add at this aperture.\u003c\/p\u003e\u003cp\u003eFluorite's anomalous partial dispersion is what makes the front doublet capable of triplet-like colour correction from two elements, and the same hard multicoatings used across the FS-60 range protect the fluorite surface here. The 158.4 mm of back focus is generous for a scope this compact, which is what makes room for a full imaging train — filter wheel, off-axis guider, or a diagonal and eyepiece — without running out of focus travel.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar and planetary imaging:\u003c\/strong\u003e at 600 mm and f\/10, more image scale than the FS-60CB's native 355 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmaller deep-sky targets:\u003c\/strong\u003e planetary nebulae and galaxy cores that need more focal length than a wide-field refractor provides.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-power visual observing:\u003c\/strong\u003e lunar detail, double stars and planets with a diagonal and eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuiding and dual-rig imaging:\u003c\/strong\u003e as a longer-focal-length second tube beside a wide-field imaging setup.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FS-60Q's back focus and image circle are published on Takahashi's own system chart, included in the Downloads tab, along with the adapters and distances for a visual or imaging train. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e collects the same figures for the whole FS-60 range in one table.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus:\u003c\/strong\u003e 158.4 mm, measured from the rear of the focuser to the focal plane.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImage circle:\u003c\/strong\u003e 44 mm, corrected.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual train:\u003c\/strong\u003e a 1.25-inch or 2-inch diagonal and eyepiece attach through the matching Takahashi visual adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA — no mount, rings or dovetail included. At 1.4 kg it suits small equatorial and travel mounts once a camera or diagonal is added.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinder and rings:\u003c\/strong\u003e tube rings, a dovetail plate and a finder bracket are separate purchases.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you are not sure whether your camera and filter setup will reach focus, send us the details and we will work it out with you.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is an optical tube assembly.\u003c\/strong\u003e Mount, tripod, rings, dovetail, diagonal, eyepiece and finder are sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe extender is built in, not removable.\u003c\/strong\u003e Unlike the FS-60CB with an accessory extender, the FS-60Q's 1.7x group is a permanent part of the optical path — there is no shorter native configuration on this tube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e60 mm is 60 mm.\u003c\/strong\u003e Resolution and light gathering follow the aperture; the FS-60Q's advantage is focal length and image scale, not more light.\u003c\/li\u003e\n\u003c\/ul\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 — at prime focus it is a diagonal and eyepiece and you are observing, or a camera and the published back focus for imaging. Takahashi's system chart in the Downloads tab lists the adapters and distances.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eLunar and planetary observing and imaging, and smaller deep-sky targets that benefit from 600 mm of focal length over a wide-field refractor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the FS-60Q and the FS-60CB?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe FS-60Q is built with the CQ 1.7x extender permanently in the optical path — 600 mm at f\/10 instead of the CB's native 355 mm at f\/5.9. The CB reaches the same 600 mm configuration with an accessory extender; the Q is bought already set up for it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it need a flattener for astrophotography?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe quadruplet design already delivers a corrected 44 mm image circle at 600 mm without an additional flattener.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work on a star tracker or small mount?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAt 1.4 kg the tube itself is light, though 600 mm of focal length asks more of tracking accuracy than a wide-field scope does. Tell us which mount you are using and we will confirm the fit.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 60 mm fluorite quadruplet apochromat running natively at 600 mm and f\/10, with a corrected 44 mm image circle and 158.4 mm of back focus, in a 1.4 kg tube built for lunar, planetary and small-target work.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047053054063,"sku":"TAK-TSK06310","price":1495.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/afcf724e6cf6ce7113b6e7e865891435.jpg?v=1786911819"},{"product_id":"takahashi-fc-100df-f-7-4-steinheil-fluorite-doublet-apo-refractor-ota-imaging-model","title":"Takahashi FC-100DF f\/7.4 Steinheil Fluorite Doublet APO Refractor OTA — Imaging Model","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-100DF is Takahashi's 100 mm Steinheil fluorite doublet apochromat in its imaging configuration — the same optical formula as the FC-100DC, built into a shorter 785 mm tube with a 2.7-inch focuser sized for camera loads. At 740 mm focal length and f\/7.4 it weighs 3.3 kg, with 223 mm of back focus at prime giving an imaging train real room to work with.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you want a 100 mm apochromat built for a camera train from the start — the imaging-length tube and larger focuser distinguish it from the visual-oriented FC-100DC. It suits deep-sky imagers working at moderate focal length, and it reduces to 480 mm at f\/4.8 with the FC-35RD reducer for a wider field, or flattens to 760 mm at f\/7.6 with the FC\/FS MFL 1.04x for full-frame coverage.\u003c\/p\u003e\u003cp\u003eVisual observers get a genuinely apochromatic 100 mm refractor with clean colour correction, though the shorter DC is the lighter choice if imaging is not the goal. Tell us your camera and sensor size and we will confirm which reducer or flattener fits your frame.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteinheil fluorite doublet:\u003c\/strong\u003e two elements in two groups, with hard multicoatings on the fluorite surfaces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e740 mm at f\/7.4:\u003c\/strong\u003e in a 785 mm tube, 95 mm across (124 mm dew shield) — built for the imaging-length back focus this focal ratio needs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.7-inch rack-and-pinion focuser:\u003c\/strong\u003e sized for the added weight of a camera, filter wheel and off-axis guider.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e223 mm of back focus\u003c\/strong\u003e at prime focus — generous room for a full imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.3 kg:\u003c\/strong\u003e heavier than the FC-100DC's visual configuration, reflecting the longer tube and larger focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e63 mm of drawtube extension\u003c\/strong\u003e for fine focus travel.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe objective is a two-element air-spaced fluorite doublet in the Steinheil configuration, sharing its optical prescription with the visual-oriented FC-100DC. Fluorite's anomalous partial dispersion pulls the red, green and blue focal points close enough together that secondary spectrum is not the limiting factor at 100 mm, and hard multicoatings protect the softer fluorite surfaces from moisture and handling.\u003c\/p\u003e\u003cp\u003eWhat separates the DF from the DC is mechanical, not optical: a shorter 785 mm tube paired with a 2.7-inch focuser rather than the DC's visual-oriented mount, giving the imaging train more rigidity under camera weight. The FC\/FS MFL 1.04x flattener brings the system to 760 mm at f\/7.6 with a 44 mm corrected circle at 71.2 mm back focus, and the FC-35RD 0.66x reducer shortens it to 480 mm at f\/4.8, also with a 44 mm circle, at 74.1 mm back focus.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep-sky imaging at native focal length:\u003c\/strong\u003e 740 mm and f\/7.4 for medium-sized targets — galaxies, planetary nebulae, tighter framing on emission nebulae.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide-field imaging:\u003c\/strong\u003e with the FC-35RD 0.66x reducer at 480 mm and f\/4.8, a 44 mm corrected circle for larger nebulae and star fields.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat-field full-frame imaging:\u003c\/strong\u003e with the FC\/FS MFL 1.04x flattener at 760 mm and f\/7.6.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing:\u003c\/strong\u003e lunar, planetary and double-star work with a diagonal and eyepiece, though the DC is the lighter-weight choice for visual-only use.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBack focus at prime is 223 mm, dropping to 71.2 mm with the MFL 1.04x flattener or 74.1 mm with the FC-35RD reducer — each conversion changes the spacing your imaging train needs to hit. Takahashi's own system charts for the base configuration, the FC-35RD reducer, the EX-Q 1.6x extender and the EX-C2X extender are in the Downloads tab, with the parts and distances for each. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e collects the same figures for the whole range in one table.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlattener:\u003c\/strong\u003e FC\/FS MFL 1.04x, 760 mm at f\/7.6, 44 mm circle, 71.2 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReducer:\u003c\/strong\u003e FC-35RD 0.66x, 480 mm at f\/4.8, 44 mm circle, 74.1 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtenders:\u003c\/strong\u003e EX-Q 1.6x and EX-C2X extend the focal length further for planetary and lunar imaging — system charts for both are in the Downloads tab.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA — no mount, rings, dovetail, diagonal or eyepiece included. At 3.3 kg plus a full imaging train, a mount rated for 8–10 kg of total payload is a reasonable starting point.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you are not sure which reducer or flattener matches your sensor, send us your camera and filter setup and we will work it out with you.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is an optical tube assembly.\u003c\/strong\u003e Mount, rings, dovetail, diagonal, eyepiece and finder are all sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA flat field needs a corrector.\u003c\/strong\u003e At prime focus the field curves; the MFL 1.04x flattener corrects it across 44 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus changes with every conversion lens.\u003c\/strong\u003e 223 mm at prime, 71.2 mm with the flattener, 74.1 mm with the reducer — the system charts in the Downloads tab list the exact parts for each.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorite needs ordinary care.\u003c\/strong\u003e The hard multicoatings protect it; standard optical cleaning practice is what it asks for.\u003c\/li\u003e\n\u003c\/ul\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. At prime focus with a diagonal and eyepiece it is straightforward visual use. Imaging trains take more care because the spacing changes with each conversion lens, and the published system charts name the exact parts and distances — send us your camera and we will confirm the train with you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDeep-sky imaging at 740 mm native, or wider at 480 mm with the FC-35RD reducer. The larger focuser and imaging-length tube distinguish it from the visual-oriented FC-100DC.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is this different from the FC-100DC?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSame optical formula, different mechanics. The DF has a shorter 785 mm tube and a 2.7-inch focuser built for camera loads; the DC is the visual-oriented configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need a flattener for astrophotography?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFor a flat field across an APS-C or full-frame sensor, yes — the MFL 1.04x flattener corrects the field curvature that shows at prime focus.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat mount does it need?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAt 3.3 kg before accessories, most mid-weight imaging mounts handle it once a full imaging train is added. Tell us your setup and we will confirm the total payload.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should this not be the choice?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFor visual-only use where the extra focuser weight and imaging-length tube add nothing — the FC-100DC covers that use case at a lighter weight.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 100 mm fluorite doublet apochromat built for imaging, at 740 mm and f\/7.4 with 223 mm of back focus, reducing to 480 mm at f\/4.8 or flattening to 760 mm at f\/7.6 depending on the conversion lens fitted. It weighs 3.3 kg and pairs a 2.7-inch focuser with published system charts for every configuration.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Diagram Reports\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes a spot diagram for the FC-100D optical design at prime focus, showing star images across the field at the design wavelengths.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/FC-100DF_spots.png?v=1786911643\" alt=\"Takahashi FC-100D series 100mm fluorite doublet spot diagram at prime focus\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047053578351,"sku":"TAK-TFK10110","price":3243.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TFK10110_FC-100DF_OTA_1.jpg?v=1786911885"},{"product_id":"takahashi-fc-76dcu-76mm-f-7-5-fluorite-doublet-refractor-ota","title":"Takahashi FC-76DCU 76mm f\/7.5 Fluorite Doublet Refractor OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-76DCU is Takahashi's 76 mm fluorite doublet apochromat — a step up in aperture from the FS-60 line, in a tube with a fixed 80 mm barrel and a retractable dew shield that extends to 95 mm. At 570 mm focal length and f\/7.5 it runs 656 mm long and weighs 1.7 kg, and it ships with a working set of visual couplings and adapters rather than a bare tube.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you want more aperture and focal length than a 60 mm refractor offers, in a tube that still packs down for travel with its retractable dew shield. It suits visual observers who want brighter, higher-resolution views of the moon and planets than a 60 mm scope delivers, and imagers who want a mid-aperture apochromat that reduces and flattens cleanly for deep-sky framing.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir-spaced fluorite doublet:\u003c\/strong\u003e two elements in two groups, the same fluorite-crystal design language as the rest of Takahashi's FC\/FS range, scaled to 76 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e570 mm at f\/7.5:\u003c\/strong\u003e more aperture and reach than the FS-60 line, still a compact travel-length tube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e159 mm of back focus:\u003c\/strong\u003e enough room for a diagonal, filter wheel or imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable dew shield:\u003c\/strong\u003e extends to 95 mm over an 80 mm tube, and collapses for transport.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30 mm drawtube extension\u003c\/strong\u003e on a rack-and-pinion focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded couplings:\u003c\/strong\u003e ships with a visual adapter, aux ring, eyepiece adapter and camera couplings — a working visual train out of the box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.7 kg:\u003c\/strong\u003e light enough for mid-sized equatorial and travel mounts.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe objective is a two-element, air-spaced fluorite doublet, the same design family as the FS-60 and FS-60Q but built to a 76 mm aperture. Fluorite's anomalous partial dispersion keeps the red, green and blue focal points close enough together that the two-element design controls colour the way a more complex triplet would at this size, and hard multicoatings on the fluorite surface protect it and cut internal reflections.\u003c\/p\u003e\u003cp\u003eThe 159 mm of back focus is what makes the FC\/FS MFL 1.04x flattener and the 76D RD NC 0.85x reducer usable on this tube — both reach focus within the published spacing, turning the same objective into either a flat 590 mm f\/7.8 imaging setup or a faster 486 mm f\/6.4 wide-field configuration.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing:\u003c\/strong\u003e lunar, planetary and double-star work at 570 mm and f\/7.5, with more resolution than a 60 mm aperture.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat-field deep-sky imaging:\u003c\/strong\u003e with the FC\/FS MFL 1.04x flattener at 590 mm and f\/7.8, corrected to a 44 mm circle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide-field imaging:\u003c\/strong\u003e with the 76D RD NC 0.85x reducer at 486 mm and f\/6.4.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTravel and eclipse observing:\u003c\/strong\u003e the retractable dew shield keeps the packed length manageable.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-76DCU's system chart, plus its Extender-C2X and Extender-Q charts, are in the Downloads tab and list every adapter and distance for each configuration. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e collects the same figures for the whole range.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus:\u003c\/strong\u003e 159 mm at prime focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField flattener:\u003c\/strong\u003e FC\/FS MFL 1.04x — 590 mm, f\/7.8, 44 mm circle, 75.0 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal reducer:\u003c\/strong\u003e 76D RD NC 0.85x — 486 mm, f\/6.4, 44 mm circle, 56.0 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded in the box:\u003c\/strong\u003e Visual Adapter (TKP20005), Coupling L (TKP00104), Aux Ring (TKP20001), Eyepiece Adapter (TKP00101) and Coupling DT (TKP20006B) — a visual train ready to accept a 1.25-inch diagonal and eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA — no mount, rings or dovetail included. At 1.7 kg it suits mid-sized equatorial and travel mounts.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you are planning an imaging train and want to confirm spacing before ordering, send us your camera and filter setup and we will work it out with you.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is an optical tube assembly.\u003c\/strong\u003e Mount, tripod, rings and dovetail are sold separately, though the visual couplings needed for an eyepiece are included.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA flat field for imaging needs the flattener or reducer.\u003c\/strong\u003e At prime focus the field curves, as on any doublet refractor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe FURD 0.64x reducer is built for the longer-tube FC-76DP, not this one.\u003c\/strong\u003e The DCU uses the 76D RD NC 0.85x reducer instead.\u003c\/li\u003e\n\u003c\/ul\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 ships with the visual couplings needed for a diagonal and eyepiece, and the system chart in the Downloads tab lists every part and distance for imaging configurations.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eVisual observing of the moon and planets at 76 mm aperture, and deep-sky imaging once the flattener or reducer is fitted.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the FC-76DCU and FC-76DP?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSame 76 mm objective and 570 mm native focal length, different tube. The DCU has a shorter, retractable-dew-shield tube at 159 mm back focus; the DP is a longer fixed tube with 207.1 mm of back focus for its own dedicated FURD reducer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it need a flattener for astrophotography?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAt prime focus, yes, for a flat field to the edge — the MFL 1.04x flattener or the 0.85x reducer each correct it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat comes in the box besides the tube?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA visual adapter, aux ring, eyepiece adapter and two couplings — enough to attach a 1.25-inch diagonal and eyepiece without buying additional adapters.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 76 mm fluorite doublet apochromat at 570 mm and f\/7.5, with 159 mm of back focus, a retractable dew shield, and the couplings needed for visual use included — ready to flatten or reduce for imaging when you add the matching corrector.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047053971567,"sku":"TAK-TFK07640","price":1833.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TFK07640_FC-76DCU_OTA_1.jpg?v=1786911918"},{"product_id":"takahashi-fc-100dz-100mm-f-8-fluorite-doublet-refractor-ota","title":"Takahashi FC-100DZ 100mm f\/8 Fluorite Doublet Refractor OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-100DZ is Takahashi's 100 mm fluorite doublet apochromat, the newest member of the FC-100D family. At 800 mm focal length and f\/8, it retracts to 770 mm and extends to 840 mm through a variable-length dew shield and tube assembly, weighing 3.7 kg. Back focus at prime is 225 mm, and the doublet uses a fluorite element paired with high-index, low-dispersion glass rather than the Steinheil pairing of the DC and DF.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you want the latest revision of Takahashi's 100 mm fluorite doublet line, with reduced blue halo compared to the FC-100D and compatibility with the existing FC-100 accessory range — flatteners, reducers and adapters already built for the DC and DF fit here too. It suits visual observers after clean, high-contrast lunar and planetary views, and imagers who reduce to 530 mm at f\/5.3 with the FC-35RD for wider framing.\u003c\/p\u003e\u003cp\u003eTell us your camera and sensor size and we will confirm which reducer or flattener gets you the field you want.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorite doublet, refined design:\u003c\/strong\u003e two elements in two groups, pairing fluorite with high-index, low-dispersion glass for reduced blue halo relative to the FC-100D.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e800 mm at f\/8:\u003c\/strong\u003e in a 770–840 mm variable-length tube, 95 mm across (124 mm dew shield).\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e2.7-inch rack-and-pinion focuser, single-speed.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e225 mm of back focus\u003c\/strong\u003e at prime focus — ample room for a full imaging or visual train.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e63 mm of drawtube extension.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible with existing FC-100 accessories:\u003c\/strong\u003e the same flatteners, reducers and adapters built for the FC-100DC and FC-100DF fit this tube.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe objective pairs a fluorite element with a high-index, low-dispersion glass element in a two-element air-spaced doublet — a refinement over the Steinheil FC-100DC\/DF pairing that Takahashi states cuts blue halo by roughly half. In practice that means tighter colour correction at the same 100 mm aperture and f\/8 focal ratio, with the retractable dew shield collapsing the 840 mm tube to 770 mm for transport.\u003c\/p\u003e\u003cp\u003eThe FC\/FS MFL 1.04x flattener brings the system to 820 mm at f\/8.2 with a 44 mm corrected circle at 71.2 mm back focus, and the FC-35RD 0.66x reducer shortens it to 530 mm at f\/5.3, also 44 mm, at 68.8 mm back focus — the same conversion lenses used across the FC-100D family.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar and planetary observing:\u003c\/strong\u003e at 800 mm and f\/8, with reduced chromatic error over the earlier FC-100D.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep-sky imaging at native focal length:\u003c\/strong\u003e 800 mm for medium-sized targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide-field imaging:\u003c\/strong\u003e with the FC-35RD 0.66x reducer at 530 mm and f\/5.3, a 44 mm corrected circle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat-field imaging:\u003c\/strong\u003e with the FC\/FS MFL 1.04x flattener at 820 mm and f\/8.2.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBack focus at prime is 225 mm, dropping to 71.2 mm with the MFL 1.04x flattener or 68.8 mm with the FC-35RD reducer. Because the FC-100DZ shares its rear cell with the DC and DF, existing FC-100 flatteners, reducers and adapters fit directly. Takahashi's system charts for the base configuration, the FC-35RD reducer and the EX-Q 1.6x extender are in the Downloads tab, and our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e collects the same figures for the whole range.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlattener:\u003c\/strong\u003e FC\/FS MFL 1.04x, 820 mm at f\/8.2, 44 mm circle, 71.2 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReducer:\u003c\/strong\u003e FC-35RD 0.66x, 530 mm at f\/5.3, 44 mm circle, 68.8 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtender:\u003c\/strong\u003e EX-Q 1.6x extends the focal length for planetary and lunar imaging — system chart in the Downloads tab.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA — no mount, rings, dovetail, diagonal or eyepiece included. At 3.7 kg plus accessories, a mount rated for 8–10 kg of total payload is a reasonable starting point.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you already own FC-100DC or FC-100DF accessories and are not sure they carry over, send us the part numbers and we will confirm.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is an optical tube assembly.\u003c\/strong\u003e Mount, rings, dovetail, diagonal, eyepiece and finder are all sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA flat field needs a corrector.\u003c\/strong\u003e At prime focus the field curves; the MFL 1.04x flattener corrects it across 44 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus changes with each conversion lens.\u003c\/strong\u003e 225 mm at prime, 71.2 mm with the flattener, 68.8 mm with the reducer — the system charts in the Downloads tab list the exact parts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe tube length varies with the dew shield position.\u003c\/strong\u003e 770 mm retracted, 840 mm extended — worth accounting for in a case or travel bag.\u003c\/li\u003e\n\u003c\/ul\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. At prime focus with a diagonal and eyepiece it is straightforward. Imaging trains take more care because spacing changes with each conversion lens, and the published system charts name the exact parts — send us your camera and we will confirm the train with you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eLunar and planetary observing with reduced chromatic error, and deep-sky imaging at 800 mm native or wider with the FC-35RD reducer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is this different from the FC-100DC and FC-100DF?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA refined optical prescription — fluorite paired with high-index, low-dispersion glass rather than the Steinheil pairing — with roughly half the blue halo of the FC-100D, while remaining compatible with the same accessory range.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo existing FC-100 accessories fit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — the flatteners, reducers and adapters built for the FC-100DC and FC-100DF fit the FC-100DZ's rear cell directly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat mount does it need?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAt 3.7 kg before accessories, most mid-weight mounts handle it once a diagonal or camera is added. Tell us your setup and we will confirm the total payload.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should this not be the choice?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFor wide-field imaging without a reducer — native f\/8 is a long native ratio for large nebulae, though the FC-35RD reducer addresses that at 530 mm and f\/5.3.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 100 mm fluorite doublet apochromat at 800 mm and f\/8, with 225 mm of back focus at prime and 63 mm of drawtube extension, weighing 3.7 kg. It reduces to 530 mm at f\/5.3 or flattens to 820 mm at f\/8.2 depending on the conversion lens, and it shares its accessory range with the rest of the FC-100D family.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Diagram Reports\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes a spot diagram for the FC-100DZ at prime focus, showing star images across the field at the design wavelengths.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/FC-100DZ_spots.png?v=1786911643\" alt=\"Takahashi FC-100DZ 100mm fluorite doublet spot diagram at prime focus\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047054004335,"sku":"TAK-TFK10310","price":4357.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TFK10310_FC-100DZ_1.jpg?v=1786911938"},{"product_id":"takahashi-fc-76dp-76mm-f-7-5-fluorite-doublet-refractor-ota","title":"Takahashi FC-76DP 76mm f\/7.5 Fluorite Doublet Refractor OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-76DP is the fixed-tube, long-backfocus version of Takahashi's 76 mm fluorite doublet apochromat — the same objective as the FC-76DCU, in a longer 95 mm-diameter tube built for reducer-based astrophotography. At 570 mm focal length and f\/7.5 it shares the DCU's native optics, but its 207.1 mm of back focus at prime focus — close to 50 mm more than the DCU — is what lets it run the dedicated 76DP FURD 0.64x reducer without running out of drawtube travel.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you already know you want a permanent 76 mm imaging platform built around the FU reducer, rather than a travel tube you reconfigure between sessions. It suits imagers assembling a fixed rig around the 365 mm f\/4.8 fast configuration the FURD reducer gives, and anyone who does not need the DCU's retractable dew shield for portability.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir-spaced fluorite doublet:\u003c\/strong\u003e the same two-element, two-group 76 mm objective used in the FC-76DCU.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e570 mm at f\/7.5:\u003c\/strong\u003e native prime-focus figures identical to the DCU.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e207.1 mm of back focus:\u003c\/strong\u003e a fixed 95 mm tube gives substantially more rear clearance than the DCU's 159 mm, built for FU reducer use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e63 mm drawtube extension\u003c\/strong\u003e on a rack-and-pinion focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.3 kg:\u003c\/strong\u003e heavier than the DCU by the length of tube, still manageable for mid-sized mounts.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe objective is the same two-element, air-spaced fluorite doublet used in the FC-76DCU — fluorite's anomalous partial dispersion gives this doublet the colour correction of a more complex design at 76 mm aperture, protected by Takahashi's hard multicoatings.\u003c\/p\u003e\u003cp\u003eWhat sets the DP apart is tube length rather than glass. The fixed 95 mm barrel extends the back focus to 207.1 mm at prime focus, which is what makes room for the 76DP FURD 0.64x reducer — a part built for this tube's back focus and not interchangeable with the DCU's 0.85x reducer. With it fitted, the same objective runs at 365 mm and f\/4.8, a materially faster system for deep-sky imaging than the native f\/7.5.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast deep-sky imaging:\u003c\/strong\u003e with the 76DP FURD 0.64x reducer at 365 mm and f\/4.8.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat-field imaging at prime focus:\u003c\/strong\u003e with the FC\/FS MFL 1.04x flattener at 590 mm and f\/7.8, corrected to a 44 mm circle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced-field imaging:\u003c\/strong\u003e with the 76D RD NC 0.85x reducer at 486 mm and f\/6.4.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing:\u003c\/strong\u003e lunar and planetary work at 570 mm and f\/7.5 with a diagonal and eyepiece.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-76DCU and FC-76DP share the same objective and the flattener and 0.85x reducer, but the 76DP FURD 0.64x reducer is built specifically for this tube's 207.1 mm back focus. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e lists the figures for both tubes side by side.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus:\u003c\/strong\u003e 207.1 mm at prime focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField flattener:\u003c\/strong\u003e FC\/FS MFL 1.04x — 590 mm, f\/7.8, 44 mm circle, 75.0 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal reducer:\u003c\/strong\u003e 76D RD NC 0.85x — 486 mm, f\/6.4, 44 mm circle, 56.0 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFU reducer:\u003c\/strong\u003e 76DP FURD 0.64x — 365 mm, f\/4.8, 44 mm circle, 56.0 mm back focus measured from the rear of the adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA — no mount, rings or dovetail included.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you are not sure which reducer your camera needs, send us your camera and filter setup and we will work it out with you.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is an optical tube assembly.\u003c\/strong\u003e Mount, tripod, rings, dovetail, diagonal, eyepiece and finder are sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe DP's FU reducer is model-specific.\u003c\/strong\u003e The 76DP FURD 0.64x is built for this tube's back focus and is a different part from the DCU's reducer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA flat field needs a corrector.\u003c\/strong\u003e At prime focus the field curves; the flattener or reducer corrects it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo fixed dew shield extension.\u003c\/strong\u003e Unlike the DCU, the DP's dew shield diameter matches the tube diameter rather than retracting further — the tube is longer overall as a result.\u003c\/li\u003e\n\u003c\/ul\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 — at prime focus it is a diagonal and eyepiece, or a camera and the appropriate spacer for your chosen reducer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the FC-76DCU and FC-76DP?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSame 76 mm objective and 570 mm native focal length, different tube. The DP's fixed 95 mm barrel gives 207.1 mm of back focus against the DCU's 159 mm, and that extra room is what the FURD reducer needs to reach focus.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFast deep-sky imaging with the FURD 0.64x reducer, where the extra back focus over the DCU matters most.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it need a flattener for astrophotography?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAt prime focus, yes, for a flat field to the edge — the MFL 1.04x flattener or the reducers each correct it differently.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use FC-76DCU accessories on this tube?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe flattener and 0.85x reducer are shared. The FURD reducer is specific to the DP's back focus and is a separate part from the DCU's reducer.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 76 mm fluorite apochromat at 570 mm and f\/7.5, built into a fixed 95 mm tube with 207.1 mm of back focus for reducer and flattener work — and a 365 mm f\/4.8 fast astrograph once the FURD reducer is attached.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047054757999,"sku":"TAK-TFA06000","price":2101.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/screenshot_2026-07-27_at_1.54.04_pm.png?v=1787082557"},{"product_id":"takahashi-fc-100dc-f-7-4-steinheil-fluorite-doublet-apo-refractor-ota-visual-model","title":"Takahashi FC-100DC f\/7.4 Steinheil Fluorite Doublet APO Refractor OTA, Visual Model","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-100DC is Takahashi's 100 mm Steinheil fluorite doublet apochromat, sold here as the Visual model — the crown element leads in this design rather than following, a configuration Takahashi has used specifically for its 100 mm fluorite refractors. At 740 mm focal length and f\/7.4 it runs 815 mm long with a 30 mm drawtube extension, and weighs 2.7 kg.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if visual observing is the main use — lunar, planetary and double-star work at 100 mm aperture, where the Steinheil doublet's colour correction and light throughput matter more than field width. It suits observers stepping up from a 60 or 76 mm apochromat who want a noticeably brighter, higher-resolution view, and anyone who wants a single well-corrected tube for the moon and planets without the added elements of a larger triplet. Takahashi also sells this objective as the FC-100DF, an imaging-oriented configuration in a different tube; this Visual model is built around eyepiece use.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteinheil fluorite doublet:\u003c\/strong\u003e two elements in two groups, with the fluorite crown element leading the light path — a Takahashi design choice specific to its 100 mm doublets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e740 mm at f\/7.4:\u003c\/strong\u003e 100 mm aperture with meaningfully more light grasp and resolution than a 60–76 mm refractor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e161 mm of back focus:\u003c\/strong\u003e room for a diagonal or a straightforward imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30 mm drawtube extension\u003c\/strong\u003e on a rack-and-pinion focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.7 kg:\u003c\/strong\u003e substantial but still manageable on a mid-sized equatorial mount.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eMost doublet apochromats use a Fraunhofer layout, with the ED or fluorite element behind the crown glass. Takahashi's 100 mm fluorite doublets instead use a Steinheil configuration, with the fluorite crown element in front. Combined with fluorite's anomalous partial dispersion, the arrangement is what Takahashi credits for the FC-100 series' colour correction and contrast at this aperture — clean planetary and lunar detail without the residual violet fringing that limits achromats at 100 mm.\u003c\/p\u003e\u003cp\u003eHard multicoatings protect the fluorite surfaces, and the 161 mm of back focus is enough for the FC\/FS MFL 1.04x flattener to reach focus at 760 mm and f\/7.6, correcting to a 44 mm image circle if imaging is added to the visual use this model is built around.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar and planetary observing:\u003c\/strong\u003e at 740 mm and f\/7.4, where the 100 mm aperture resolves finer detail than a smaller refractor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble-star splitting:\u003c\/strong\u003e the Steinheil doublet's colour correction shows clearly on close, bright pairs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCasual deep-sky visual observing:\u003c\/strong\u003e star clusters and brighter nebulae benefit from the extra aperture over a 60–76 mm scope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOccasional imaging:\u003c\/strong\u003e with the FC\/FS MFL 1.04x flattener at 760 mm and f\/7.6, for those who want to photograph the moon or planets without switching to the dedicated FC-100DF.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-100DC's system chart, plus its Extender-Q and Extender-C2X charts, are in the Downloads tab and list the adapters and distances Takahashi publishes for each configuration. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e collects the same figures for the whole range.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus:\u003c\/strong\u003e 161 mm at prime focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField flattener:\u003c\/strong\u003e FC\/FS MFL 1.04x — 760 mm, f\/7.6, 44 mm circle, 71.2 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA — no mount, rings or dovetail included. At 2.7 kg it suits mid-sized equatorial mounts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelated model:\u003c\/strong\u003e the FC-100DF shares this objective in a tube built around imaging rather than visual use, with a different back focus and reducer options.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you are weighing this Visual model against the imaging-oriented FC-100DF, send us how you plan to use it and we will help you choose.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is an optical tube assembly.\u003c\/strong\u003e Mount, tripod, rings, dovetail, diagonal, eyepiece and finder are sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is the Visual model.\u003c\/strong\u003e It is built around eyepiece use; the FC-100DF is Takahashi's dedicated imaging configuration of the same objective, in a different tube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA flat field for imaging needs the MFL 1.04x flattener.\u003c\/strong\u003e At prime focus the field curves, as on any doublet refractor.\u003c\/li\u003e\n\u003c\/ul\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 — at prime focus it is a diagonal and eyepiece and you are observing. The system chart in the Downloads tab lists parts and distances if you add a flattener for imaging.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eVisual observing of the moon, planets and double stars at 100 mm aperture. It can image with the MFL 1.04x flattener, but the FC-100DF is Takahashi's dedicated model for that use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between this and the FC-100DF?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSame 100 mm Steinheil fluorite doublet objective, different tube and intended use — this Visual model is built for eyepiece observing; the DF is configured for astrophotography with its own back focus and reducer options.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does Steinheil mean, and why does it matter?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt describes which element leads the light path — the fluorite crown element sits in front here, rather than behind the flint element as in a Fraunhofer doublet. Takahashi uses this layout specifically on its 100 mm fluorite doublets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for astrophotography?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWith the FC\/FS MFL 1.04x flattener, yes, at 760 mm and f\/7.6 across a 44 mm corrected circle — though the FC-100DF is the model built specifically for that purpose.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 100 mm Steinheil fluorite doublet apochromat at 740 mm and f\/7.4, with 161 mm of back focus, built as a visual instrument for lunar, planetary and double-star observing.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047058591855,"sku":"TAK-TFK10010","price":2863.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TFK10010_FC-100DC_1.jpg?v=1786912049"},{"product_id":"takahashi-sd-ring-for-fs-60c-multi-flattener","title":"Takahashi SD Ring for FS-60C Multi-Flattener","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SD Ring is the spacing adapter Takahashi publishes for fitting the \u003ca href=\"\/products\/takahashi-fc-fs-multi-flattener-1-04x-field-flattener\"\u003eFC\/FS Multi-Flattener 1.04x\u003c\/a\u003e to the FS-60C. It threads M55.9 x 0.75 and adds a 17.5 mm light path — the figures Takahashi lists in its accessory ring table for this part.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is what you need if you own an FS-60C and are setting up the FC\/FS Multi-Flattener 1.04x for imaging. It is a spacing part, not a standalone accessory.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM55.9 x 0.75 thread:\u003c\/strong\u003e the interface Takahashi publishes for this ring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e17.5 mm light path:\u003c\/strong\u003e the length it adds to the imaging train ahead of the flattener.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePurpose-built for the FS-60C:\u003c\/strong\u003e distinct from the CA-60C ring used on the FS-60CB.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eImaging setup on the FS-60C\u003c\/strong\u003e with the FC\/FS Multi-Flattener 1.04x.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi's own accessory ring table notes that the SD Ring cannot be threaded onto the female port of the Camera Angle Adjuster S — the same restriction applies to the M55.9 Extension Tube L30. If your train includes the Camera Angle Adjuster S, check the fit with us before ordering. Full spacing figures for the FC and FS line are in 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\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt does not work alone.\u003c\/strong\u003e The SD Ring only sets spacing for the Multi-Flattener 1.04x on the FS-60C — the flattener itself is a separate purchase.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot for use with the Camera Angle Adjuster S\u003c\/strong\u003e — Takahashi's own documentation flags this combination as incompatible. If that is part of your train, send us the details and we will confirm an alternative.\u003c\/li\u003e\n\u003c\/ul\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 directly into the imaging train ahead of the flattener at the published M55.9 x 0.75 interface.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this the same as the CA-60C ring?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. The CA-60C is matched to the FS-60CB; the SD Ring is the part Takahashi publishes for the FS-60C.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it with the Camera Angle Adjuster S?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTakahashi's documentation says no — the thread will not engage the Camera Angle Adjuster S's female port. Send us your setup and we will work out the right combination.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: an M55.9 x 0.75, 17.5 mm spacing ring that sets up the FC\/FS Multi-Flattener 1.04x correctly on the FS-60C.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047107547247,"sku":"TAK-TKA20583","price":54.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka20583-1.jpg?v=1786913864"},{"product_id":"takahashi-fct-65d-0-65x-fu-reducer","title":"Takahashi FCT-65D 0.65x FU Reducer","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FCT-65D 0.65x FU Reducer is Takahashi's dedicated fluorite focal reducer for the FCT-65D refractor. It brings the telescope's native 400mm f\/6.2 down to 260mm at f\/4.0, and two of its elements are fluorite glass — the material that lets Takahashi push a reduction this aggressive while still holding a flat Φ44mm image circle.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis reducer suits FCT-65D owners imaging wide star fields, nebulae, and comets who want the fastest focal ratio the telescope supports. At f\/4.0 it gathers roughly 2.4x the light of the native f\/6.2 setup for the same exposure time.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorite reducer elements:\u003c\/strong\u003e control the chromatic error a reduction this strong would otherwise introduce.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.65x reduction:\u003c\/strong\u003e takes the FCT-65D from 400mm f\/6.2 to 260mm f\/4.0.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ44mm corrected image circle:\u003c\/strong\u003e covers a full APS-C sensor with sharp stars into the corners.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM55.9 thread mount:\u003c\/strong\u003e installs directly into the FCT-65D drawtube system.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe reducer sits mostly inside the FCT-65D's drawtube, so the aggressive 0.65x reduction adds little to the telescope's front-to-back balance. It pairs with the included CA-35 (FURD) spacing ring, which sets a fixed back focus of 56.0mm measured from the rear of the adapter rather than from the telescope's own focal plane — the figure to build your imaging train from. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWide-field deep-sky imaging of nebulae, clusters, and large galaxies; comet photography where a fast focal ratio shortens the exposures needed on a moving target; general FCT-65D astrophotography where exposure time is at a premium.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\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\u003eFCT-65D\u003c\/td\u003e\n\u003ctd\u003e260mm\u003c\/td\u003e\n\u003ctd\u003ef\/4.0\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e56.0mm (from rear of adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThe CA-35 (FURD) spacing ring ships with the reducer and fixes the 56.0mm figure above. Camera-side spacing from there follows your camera's own flange distance — the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e covers the full chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eBuilt specifically for the FCT-65D:\u003c\/strong\u003e the figures above are for that telescope only — other Takahashi refractors pair with their own dedicated reducers.\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 FCT-65D drawtube along with the included CA-35 spacing ring, and the 56.0mm back focus figure is fixed by that ring rather than something you measure and adjust yourself.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field astrophotography on the FCT-65D, where the 0.65x reduction to f\/4.0 shortens exposures on nebulae, clusters, and comets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it's built to deliver a flat photographic image circle rather than a visual, eyepiece-compatible path.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe CA-35 (FURD) spacing ring, included with the reducer, and your camera's own T-ring or adapter to complete the 56.0mm back focus.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA dedicated fluorite reducer that takes the FCT-65D to 260mm at f\/4.0 with a flat Φ44mm image circle, set up with the included CA-35 ring at a fixed 56.0mm back focus.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047107907695,"sku":"TAK-TKA11580F","price":1072.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka11580f.jpg?v=1786913880"},{"product_id":"takahashi-fc-76dp-0-64x-fu-reducer","title":"Takahashi FC-76DP 0.64x FU Reducer","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-76DP 0.64x FU Reducer is Takahashi's dedicated fluorite focal reducer for the FC-76DP refractor. It brings the telescope's native 570mm f\/7.5 down to 365mm at f\/4.8, using fluorite elements to keep chromatic error under control at this level of reduction.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis reducer suits FC-76DP owners who image both wide fields and tighter deep-sky targets and want a faster focal ratio without giving up the telescope's sharp, high-contrast optics. Takahashi's own spot-radius figures for this combination run about 1.5 microns across APS-C and under 2 microns even at the edge of full frame.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorite reducer elements:\u003c\/strong\u003e hold chromatic error in check through the 0.64x reduction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.64x reduction:\u003c\/strong\u003e takes the FC-76DP from 570mm f\/7.5 to 365mm f\/4.8.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ44mm corrected image circle:\u003c\/strong\u003e covers APS-C fully, with strong performance well into full-frame corners.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM55.9 thread mount:\u003c\/strong\u003e installs directly into the FC-76DP drawtube system.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe reducer pairs with the included CA-35 (FURD) spacing ring, which sets a fixed back focus of 56.0mm measured from the rear of the adapter. That figure — not the telescope's native focal plane — is the one to build an imaging train from. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eDeep-sky imaging of nebulae, clusters, and galaxies at a fast f\/4.8; full-frame astrophotography where the wide, well-corrected image circle counts; general FC-76DP imaging where shorter exposures are worth the reduced focal length.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\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\u003eFC-76DP\u003c\/td\u003e\n\u003ctd\u003e365mm\u003c\/td\u003e\n\u003ctd\u003ef\/4.8\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e56.0mm (from rear of adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThe CA-35 (FURD) spacing ring ships with the reducer and fixes the 56.0mm figure above. Camera-side spacing from there follows your camera's own flange distance — full detail in 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\u003eBuilt specifically for the FC-76DP:\u003c\/strong\u003e these figures don't carry over to the FC-76DCU or other FC siblings, which use their own reducers.\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 FC-76DP drawtube with the included CA-35 spacing ring, and the 56.0mm back focus figure is fixed by that ring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDeep-sky astrophotography on the FC-76DP at a fast f\/4.8, across both APS-C and full-frame sensors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it's built for a flat photographic image circle rather than a visual eyepiece path.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe CA-35 (FURD) spacing ring, included with the reducer, and your camera's own T-ring or adapter to complete the 56.0mm back focus.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA dedicated fluorite reducer that takes the FC-76DP to 365mm at f\/4.8 with a flat Φ44mm image circle, set up with the included CA-35 ring at a fixed 56.0mm back focus.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047109349487,"sku":"TAK-TKA18580F","price":1072.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka18580f-1.jpg?v=1786913900"},{"product_id":"takahashi-1-7x-cq-extender-module-for-fs-60q-refractor","title":"Takahashi EX CQ 1.7x Extender for FS-60CB (FS-60Q Conversion)","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe EX CQ 1.7x Extender installs between the focuser and the FS-60CB's fluorite doublet objective, converting the tube's optics to the same 600 mm f\/10.0 configuration published for the FS-60Q. It threads in place with an M55.9 mount and flattens the image circle to 44 mm at the same time as it extends the focal length.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you already own the FS-60CB and want the FS-60Q's longer reach — for solar eclipse photography, lunar and planetary imaging, and higher-magnification visual use — without buying a second optical tube.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConverts FS-60CB to FS-60Q spec:\u003c\/strong\u003e 355mm f\/5.9 becomes 600mm f\/10.0, matching Takahashi's own FS-60Q optical tube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e44mm flattened image circle:\u003c\/strong\u003e the extended path is corrected at the same time it is lengthened.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstalls between focuser and tube:\u003c\/strong\u003e a permanent-feeling but removable module rather than a drawtube accessory.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpens up reducer options:\u003c\/strong\u003e Takahashi notes the resulting f\/10 system can be brought back down toward f\/6.2 or f\/4.2 with the matching reducers.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FS-60 platform ships as a 355mm f\/5.9 fluorite doublet in CB form. The EX CQ 1.7x sits ahead of the focuser and behind the objective, changing the light path so the whole system performs exactly as Takahashi's dedicated FS-60Q tube does — 600mm at f\/10.0, with the image circle flattened to 44mm and a published back focus of 158.4mm from the rear of the module.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eSolar eclipse and transit photography at longer focal length, lunar and planetary imaging, and higher-power visual observing on a compact 60mm platform.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes this pairing for the FS-60CB specifically.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eNative\u003c\/th\u003e\n\u003cth\u003eWith EX CQ1.7x\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\u003e600mm f\/10.0\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e158.4mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThe resulting figures match Takahashi's own FS-60Q optical tube exactly, so accessories rated for the FS-60Q's back focus generally carry over. Full spacing guidance is in 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\u003eIt replaces the CB configuration rather than sitting alongside it:\u003c\/strong\u003e once installed, the tube runs at f\/10.0 until the module is removed.\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 installs as a single module between the focuser and the objective cell, with no separate spacing to calculate for the base configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eExtending the FS-60CB's reach for solar, lunar, and planetary work at f\/10.0.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this make my FS-60CB an FS-60Q?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eOptically, yes — the resulting focal length, ratio, image circle, and back focus match Takahashi's FS-60Q tube exactly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I reduce the focal ratio back down afterward?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTakahashi notes the resulting f\/10 system pairs with its own reducers to bring the ratio back toward f\/6.2 or f\/4.2 — send us your imaging setup and we will confirm the right one.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe EX CQ 1.7x Extender turns an FS-60CB into the optical equivalent of Takahashi's FS-60Q — 600mm at f\/10.0 with a 44mm flattened image circle and 158.4mm of back focus.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047116394607,"sku":"TAK-TKA20595","price":531.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tfk6004qm_1_2_6.jpg?v=1786914166"},{"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":762.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka20580b_3.jpg?v=1786914460"},{"product_id":"takahashi-fc-35-0-66x-reducer-for-fc-fs-series","title":"Takahashi FC-35 0.66x Reducer for FC \/ FS Series","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-35 is Takahashi's 0.66x reducer for the FC and FS series refractors. On the FC-100DF it produces a 480 mm focal length at f\/4.8, with a Ø44 mm image circle that covers a full-frame sensor. It was designed for digital imaging rather than adapted to it.\u003c\/p\u003e\u003cp\u003eEach compatible telescope reaches a different focal length behind it, and each requires its own \u003cstrong\u003eCA ring\u003c\/strong\u003e to set the correct backfocus. The CA ring is a separate purchase — see the table below for which one your telescope takes.\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 FC or FS series refractor and want a faster system with a flat field across a full-frame sensor.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.66x reduction:\u003c\/strong\u003e the FC-100DF goes to 480 mm at f\/4.8.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eØ44 mm image circle:\u003c\/strong\u003e covers a 35 mm full-frame sensor, and it is the same figure on every compatible model.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSix compatible telescopes:\u003c\/strong\u003e FC-100DF, FC-100, FS-102, FC-125, FS-128 and FS-152.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel-specific CA ring:\u003c\/strong\u003e sets backfocus for your particular telescope. Sold separately.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA reducer shortens the effective focal length and speeds up the focal ratio — the same target in less exposure time, over a wider field. What separates a good one from a poor one is what happens away from the optical axis: reduction tends to introduce field curvature and enlarge star images at the edges. The Ø44 mm image circle is the answer here, and it holds across all six compatible telescopes rather than shrinking on the longer ones.\u003c\/p\u003e\u003cp\u003eThe CA ring is what makes one reducer serve six telescopes. Each model presents its optics at a different distance from the focal plane, so the ring — in 100D, 102 or 130 form — sets the spacing correctly for that tube. Get the ring right and the reducer performs as specified; use the wrong one and the corner stars are where it shows.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWide-field deep-sky astrophotography on an FC or FS refractor — large nebulae, extended galaxies, and mosaic panels where the extra field and the faster ratio both count.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eFocal length\u003c\/th\u003e\n\u003cth\u003eFocal ratio\u003c\/th\u003e\n\u003cth\u003eCA ring required\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFC-100DF\u003c\/td\u003e\n\u003ctd\u003e480mm\u003c\/td\u003e\n\u003ctd\u003ef\/4.8\u003c\/td\u003e\n\u003ctd\u003e100D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFC-100\u003c\/td\u003e\n\u003ctd\u003e530mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.3\u003c\/td\u003e\n\u003ctd\u003e102\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFS-102\u003c\/td\u003e\n\u003ctd\u003e545mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.3\u003c\/td\u003e\n\u003ctd\u003e102\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFC-125\u003c\/td\u003e\n\u003ctd\u003e670mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.4\u003c\/td\u003e\n\u003ctd\u003e130\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFS-128\u003c\/td\u003e\n\u003ctd\u003e700mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.5\u003c\/td\u003e\n\u003ctd\u003e130\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFS-152\u003c\/td\u003e\n\u003ctd\u003e820mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.4\u003c\/td\u003e\n\u003ctd\u003e130\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eWe stock the Takahashi CA rings. Tell us which telescope and camera you are pairing this with and we will send the matching ring alongside it, so the train is complete when it arrives.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eThe CA ring is a separate item:\u003c\/strong\u003e Takahashi supplies the reducer on its own, and the ring that sets backfocus for your telescope is bought with it. We will pair them for you — just tell us the model.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAn imaging corrector, not a visual one:\u003c\/strong\u003e the FC-35 is designed for a camera at the focal plane and has no application in a visual train with an eyepiece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eThe ring is telescope-specific:\u003c\/strong\u003e 100D for the FC-100DF, 102 for the FC-100 and FS-102, 130 for the FC-125, FS-128 and FS-152.\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 — the CA ring does the work of setting the spacing for your telescope, so once you have the right ring it threads together directly. Getting the right ring is the step to take care over, and we will confirm it with you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does it do to my focal length?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eReduces it by roughly a third. On the FC-100DF that is 480 mm at f\/4.8.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it cover a full-frame camera?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — the Ø44 mm image circle covers a 35 mm full-frame sensor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the CA ring included?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Takahashi sells the ring separately and it is specific to your telescope. We stock them and will pair the right one with your order.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich telescopes does it fit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe FC-100DF, FC-100, FS-102, FC-125, FS-128 and FS-152.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA 0.66x reducer that turns an FC or FS refractor into a fast, flat, full-frame imaging system — 480 mm at f\/4.8 on the FC-100DF, with the matching CA ring ordered alongside it.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54086044319855,"sku":"TAK-TKA19580","price":1255.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/reducer_2_6.jpg?v=1787328854"},{"product_id":"takahashi-fc-76d-reducer","title":"Takahashi FC-76D Reducer","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi's dedicated reducer for the FC-76D, and compatible with all FC-76 and FS-78 tubes. On the FC-76D it produces 417 mm at f\/5.5 with a 36 mm image circle — a faster, wider system than the telescope's native configuration, with enough illuminated field to cover an APS-C sensor comfortably.\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 FC-76D, FC-76 or FS-78 and want a faster focal ratio and a wider field.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e417 mm at f\/5.5 on the FC-76D:\u003c\/strong\u003e the headline configuration this reducer was designed around.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e36 mm image circle:\u003c\/strong\u003e consistent across all three compatible telescopes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDedicated design:\u003c\/strong\u003e built for the FC-76D specifically rather than adapted from a general-purpose corrector.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlso fits FC-76 and FS-78:\u003c\/strong\u003e each with its own resulting focal length and ratio.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA reducer shortens effective focal length and speeds the focal ratio, which shortens exposures and widens the field — but only holds up if the corners stay sharp. Takahashi publishes a 36 mm image circle for this reducer on all three compatible tubes, which covers an APS-C sensor (roughly 28 mm diagonal) with real margin, and reaches most of a full-frame sensor's 43 mm diagonal without covering its corners. The three telescopes each land at a slightly different focal length behind it — 417 mm on the FC-76D, 438 mm on the FC-76, 462 mm on the FS-78 — because each starts from a different native focal length.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWide-field deep-sky imaging on a small Takahashi refractor: large nebulae, star fields, and widefield framing where the native focal ratio would ask for longer exposures.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eFocal length with reducer\u003c\/th\u003e\n\u003cth\u003eFocal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFC-76D\u003c\/td\u003e\n\u003ctd\u003e417mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.5\u003c\/td\u003e\n\u003ctd\u003e36mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFC-76\u003c\/td\u003e\n\u003ctd\u003e438mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.8\u003c\/td\u003e\n\u003ctd\u003e36mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFS-78\u003c\/td\u003e\n\u003ctd\u003e462mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.9\u003c\/td\u003e\n\u003ctd\u003e36mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eTakahashi does not publish the backfocus figure on this listing, and that is the number that decides corner star shape once your camera and filters are in the train. Send us the camera and any filter drawer or spacers you are running and we will work the total through with you before you order.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eAn imaging corrector, not a visual one:\u003c\/strong\u003e it is designed for a camera at the focal plane and has no application in a visual train with an eyepiece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e36 mm image circle:\u003c\/strong\u003e that covers APS-C with margin. A full-frame sensor's corners fall outside it, so full-frame users should expect fall-off at the extremes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBackfocus is not published here:\u003c\/strong\u003e it is the figure worth pinning down for your exact camera, and we will do that with you.\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. The work is in getting the spacing to the sensor right, and that is a number we can give you for your setup.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does it do to my focal length?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e417 mm at f\/5.5 on the FC-76D, 438 mm at f\/5.8 on the FC-76, 462 mm at f\/5.9 on the FS-78.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it cover my camera?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe 36 mm image circle covers APS-C comfortably. Full-frame corners sit outside it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich telescopes does it fit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe FC-76D, all FC-76 tubes, and the FS-78.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA dedicated reducer that takes the FC-76D to 417 mm at f\/5.5 over a 36 mm field — a faster, wider version of a small Takahashi refractor for imaging.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54086044516463,"sku":"TAK-TKA18580","price":875.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka1858_1_2_6.jpg?v=1787328881"},{"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"},{"product_id":"takahashi-multi-reducer-0-85x-m-medium","title":"Takahashi Multi-Reducer 0.85x-M for FCT-65D \/ FC-50","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe M version of Takahashi's 0.85x Multi-Reducer, matched to the \u003cstrong\u003eFCT-65D and FC-50\u003c\/strong\u003e. On the FCT-65D it gives \u003cstrong\u003e340 mm at f\/5.2\u003c\/strong\u003e; on the FC-50, 340 mm at f\/6.8. The image circle is Ø44 mm, which covers a full-frame sensor.\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. M is the FCT-65D and FC-50; S is the FS-60 series; 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 FCT-65D and want the matched reducer — the one Takahashi computed for that tube.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e340 mm at f\/5.2 on the FCT-65D:\u003c\/strong\u003e the configuration this version is built around.\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 reduces and flattens together.\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 × 54.7 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 — modest next to a 0.6x or 0.7x reducer, and one that keeps image scale usable rather than collapsing it. The four-element, three-group design is what holds the Ø44 mm circle: it corrects field curvature across a full-frame sensor while reducing, which a simpler design would not manage at this speed.\u003c\/p\u003e\u003cp\u003eOn the FCT-65D specifically, this takes a 65 mm fluorite triplet from f\/6.2 to f\/5.2 while keeping full-frame coverage — a meaningful gain in exposure time on an already well-corrected tube.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWide-field deep-sky imaging on the FCT-65D: large nebulae, extended objects, and framing that benefits from field rather than magnification.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi computes this version for the \u003cstrong\u003eFCT-65D and FC-50\u003c\/strong\u003e. The threads are M55.9 (P=0.75) on the telescope side and M52 (P=0.75) on the camera side.\u003c\/p\u003e\u003cp\u003eNote that the FCT-65D also has a dedicated \u003cstrong\u003e65D FU Reducer 0.65x\u003c\/strong\u003e, which is a different and stronger corrector. The 0.85x-M is the gentler option; the FU reducer takes the focal length down further. We stock both — tell us what you are framing and we will talk through which suits.\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 is the way to get the right one.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTwo reducers exist for the FCT-65D:\u003c\/strong\u003e this 0.85x and the dedicated 0.65x FU reducer. They give different focal lengths and suit different targets.\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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat will my FCT-65D become?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e340 mm at f\/5.2.\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 is this different from the 65D FU Reducer?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe FU reducer is 0.65x and takes the focal length down considerably further. This one is the gentler 0.85x. Both are matched to the FCT-65D.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FCT-65D version of Takahashi's 0.85x Multi-Reducer — 340 mm at f\/5.2 over a full-frame field.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54086045007983,"sku":"TAK-TKA00580M","price":676.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka00580m.jpg?v=1787328935"},{"product_id":"takahashi-multi-reducer-0-85x-l-long","title":"Takahashi Multi-Reducer 0.85x-L for FC-76 \/ FC-60 \/ FC-65 Series","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe L version of Takahashi's 0.85x Multi-Reducer, matched to the \u003cstrong\u003eFC-76 series and the FC-60 and FC-65\u003c\/strong\u003e: specifically the FC-76DCU, FC-76DS, FC-76DP, FC-76DC, FC-60, FC-65 and FC-76. On an FC-76D it gives \u003cstrong\u003e486 mm at f\/6.4\u003c\/strong\u003e, with a Ø44 mm image circle that covers a full-frame sensor.\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. L is the FC-76 and FC-60\/65 series; S is the FS-60 series; M is the FCT-65D and FC-50.\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 FC-76-series tube, or with an FC-60 or FC-65, and want the reducer Takahashi computed for it.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e486 mm at f\/6.4 on the FC-76D:\u003c\/strong\u003e the headline configuration for this version.\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\u003eSeven compatible tubes:\u003c\/strong\u003e the widest coverage of the three versions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour elements in three groups:\u003c\/strong\u003e reduces and flattens together.\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 × 54.3 mm, approx. 210 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 — modest next to a 0.6x or 0.7x reducer, and one that keeps image scale usable rather than collapsing it. The four-element, three-group design is what holds the Ø44 mm circle: it corrects field curvature across a full-frame sensor while reducing, which a simpler 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 FC-76, FC-65 or FC-60: large nebulae, star fields, and framing that benefits from the extra field and shorter exposures.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eFocal length with reducer\u003c\/th\u003e\n\u003cth\u003eFocal ratio\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFC-76D series\u003c\/td\u003e\n\u003ctd\u003e486mm\u003c\/td\u003e\n\u003ctd\u003ef\/6.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFC-76\u003c\/td\u003e\n\u003ctd\u003e510mm\u003c\/td\u003e\n\u003ctd\u003ef\/6.7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFC-65\u003c\/td\u003e\n\u003ctd\u003e425mm\u003c\/td\u003e\n\u003ctd\u003ef\/6.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFC-60\u003c\/td\u003e\n\u003ctd\u003e425mm\u003c\/td\u003e\n\u003ctd\u003ef\/7.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThreads are M55.9 (P=0.75) on the telescope side and M52 (P=0.75) on the camera side. Note that the FC-76DP also has a dedicated \u003cstrong\u003e76DP FU Reducer 0.64x\u003c\/strong\u003e, which is a stronger corrector than this one — we stock it if you want the shorter focal length.\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 is the way to get the right one.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eA stronger option exists for the FC-76DP:\u003c\/strong\u003e the 0.64x FU reducer. This 0.85x is the gentler reduction across the wider family.\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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat will my FC-76D become?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e486 mm at f\/6.4.\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\u003eWhich telescopes does it fit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe FC-76DCU, FC-76DS, FC-76DP, FC-76DC, FC-60, FC-65 and FC-76.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-76 version of Takahashi's 0.85x Multi-Reducer — 486 mm at f\/6.4 on an FC-76D, over a full-frame field.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54086045565039,"sku":"TAK-TKA00580L","price":676.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka00580l.jpg?v=1787328953"}],"url":"https:\/\/ontariotelescope.com\/collections\/takahashi-fc.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}