{"product_id":"takahashi-ca-76-multi-flattener-ca-ring","title":"Takahashi CA-76 Multi-Flattener CA Ring","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe CA-76 is the spacer ring that sets correct back focus for the \u003ca href=\"\/products\/takahashi-fc-fs-multi-flattener-1-04x-field-flattener\"\u003eTakahashi FC\/FS Multi-Flattener 1.04x\u003c\/a\u003e on the FC-76D, FC-76 and FS-78. The flattener is a common optic across the FC and FS doublet line; the CA ring is what makes the spacing correct for your specific tube. Fitted with the CA-76, the pair sets a 75.0 mm metal back distance, the figure Takahashi publishes for this telescope group.\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 FC-76D, FC-76 or FS-78 and are fitting the FC\/FS Multi-Flattener 1.04x for imaging. It has no function on its own — it is bought alongside the flattener, not instead of it.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope-specific spacing:\u003c\/strong\u003e sets the 75.0 mm metal back distance Takahashi publishes for the FC-76D, FC-76 and FS-78 with this flattener.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreads directly onto the Multi-Flattener:\u003c\/strong\u003e the ring's accessory side mates with the flattener's M56 x 0.75 telescope-side thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact and light:\u003c\/strong\u003e a single machined ring, adding minimal length ahead of the flattener.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging setup on the FC-76D, FC-76 or FS-78:\u003c\/strong\u003e fitted between telescope and flattener whenever this model group is used for astrophotography.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwitching the Multi-Flattener between tubes:\u003c\/strong\u003e if you own more than one FC or FS telescope, the CA ring is what changes when you move the flattener across them.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe CA-76 is one of seven CA rings Takahashi publishes for the Multi-Flattener 1.04x, each matched to a different telescope group:\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eCA ring\u003c\/th\u003e\n\u003cth\u003eTakahashi part\u003c\/th\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eMetal back distance\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-50\u003c\/td\u003e\n\u003ctd\u003eTKA01203\u003c\/td\u003e\n\u003ctd\u003eFC-50\u003c\/td\u003e\n\u003ctd\u003e84.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-60C\u003c\/td\u003e\n\u003ctd\u003eTKA20203\u003c\/td\u003e\n\u003ctd\u003eFS-60CB\u003c\/td\u003e\n\u003ctd\u003e87.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-65\u003c\/td\u003e\n\u003ctd\u003eTKA03203\u003c\/td\u003e\n\u003ctd\u003eFC-60, FC-65\u003c\/td\u003e\n\u003ctd\u003e78.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-76\u003c\/td\u003e\n\u003ctd\u003eTKA18203\u003c\/td\u003e\n\u003ctd\u003eFC-76D, FC-76, FS-78\u003c\/td\u003e\n\u003ctd\u003e75.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-100\u003c\/td\u003e\n\u003ctd\u003eTKA19203\u003c\/td\u003e\n\u003ctd\u003eFC-100D, FC-100\u003c\/td\u003e\n\u003ctd\u003e71.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-125\u003c\/td\u003e\n\u003ctd\u003eTKA07203\u003c\/td\u003e\n\u003ctd\u003eFC-100DL, FS-102, FC-125\u003c\/td\u003e\n\u003ctd\u003e69.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-128\u003c\/td\u003e\n\u003ctd\u003eTKA24203\u003c\/td\u003e\n\u003ctd\u003eFS-128, FS-152\u003c\/td\u003e\n\u003ctd\u003e66.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eFull 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 CA-76 only sets spacing for the Multi-Flattener 1.04x — the flattener itself is a separate purchase.\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 between the telescope and the flattener, setting the 75.0 mm back focus without any adjustment on your part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need this if I already own the Multi-Flattener?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, if your telescope is an FC-76D, FC-76 or FS-78. The flattener ships without a ring; the ring is what makes it fit your tube.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the CA-76 fit a different FC or FS model?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — each CA ring is matched to a specific telescope group and back focus figure. Send us your model and we will confirm the right ring.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: the spacer ring that fits the FC\/FS Multi-Flattener 1.04x to the FC-76D, FC-76 and FS-78, setting the 75.0 mm back focus Takahashi publishes for this group.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047104073839,"sku":"TAK-TKA18203","price":48.62,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka18203_1.jpg?v=1786913769","url":"https:\/\/ontariotelescope.com\/products\/takahashi-ca-76-multi-flattener-ca-ring","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}