{"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":1515.8,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/afcf724e6cf6ce7113b6e7e865891435.jpg?v=1786911819","url":"https:\/\/ontariotelescope.com\/products\/takahashi-fs-60q-60mm-f-10-fluorite-quadruplet-refractor-ota","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}