{"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":537.68,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tfk6004qm_1_2_6.jpg?v=1786914166","url":"https:\/\/ontariotelescope.com\/products\/takahashi-1-7x-cq-extender-module-for-fs-60q-refractor","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}