{"product_id":"takahashi-fs-60cb-auxiliary-ring-57mm","title":"Takahashi FS-60CB Auxiliary Ring 57mm","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Auxiliary Ring (FS-60CB) is a Takahashi adapter ring built for the FS-60CB refractor's camera-side thread. It carries a published light path of 57 mm — the amount it adds to your optical train, not its physical length end to end — with an M52 x 0.75 male thread on one side and an M55.9 x 0.75 female thread on the other.\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 and need to extend or adapt its camera-side connection to reach a specific back focus or fit an additional accessory in the train.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e57 mm published light path:\u003c\/strong\u003e a fixed, known contribution to your back focus total.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM52 x 0.75 male to M55.9 x 0.75 female threads:\u003c\/strong\u003e matches the FS-60CB's own camera-side interface on one end.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle-piece aluminum ring:\u003c\/strong\u003e no moving parts to maintain.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eExtending the FS-60CB's camera-side train for imaging, or adapting it to accept a further eyepiece or coupling for visual use.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBuilt for the FS-60CB. Because 57 mm is a meaningful fraction of most imaging back-focus budgets, it is worth checking this figure against your camera and any flattener or reducer already in the train — the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e tabulates every Takahashi adapter's light path alongside each telescope's back focus target.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eLight path adds up quickly on a short-focus scope:\u003c\/strong\u003e on the FS-60CB, 57 mm is a large share of the available back focus budget. Send us your full camera and accessory chain and we will work out the total spacing 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 on at both ends with no adjustment involved.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAdding a defined 57 mm of light path to the FS-60CB's camera-side train, most often to reach a target back focus for a flattener or camera.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it change what the FS-60CB can be used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it is a mechanical spacer with no optical elements, so it works the same for visual or imaging use.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA 57 mm light-path ring for the FS-60CB, with M52 male and M55.9 female threads on either end. It is worth confirming against the rest of your train before ordering.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047908266095,"sku":"TAK-TKP20001","price":102.96,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tkp20001.jpg?v=1786936369","url":"https:\/\/ontariotelescope.com\/products\/takahashi-fs-60cb-auxiliary-ring-57mm","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}