{"product_id":"takahashi-2-adapter-for-fsq85-ed","title":"Takahashi 2\" Adapter for FSQ85-ED","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi's 50.8 Adapter for the FSQ-106EDX4 and FSQ-85EDX (TKP27110S) slides inside the existing focuser drawtube on these two telescopes to accept 2-inch eyepieces and diagonals. It's also required on the FSQ-106EDX4 when the 1.6x Extender is fitted, where it supplies the same 2-inch step for that configuration.\u003c\/p\u003e\u003cp\u003eTakahashi publishes a light path length of 30 mm for it — shorter than the equivalent adapter for the FS-102\/128\/130\/152 series (40 mm), tuned instead to how these two telescopes are spaced. It's still worth factoring into a backfocus calculation if your train is already close to its limit.\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 FSQ-85EDX or FSQ-106EDX4 and want to run 2-inch eyepieces or a diagonal directly, or if you're running the 1.6x Extender on the FSQ-106EDX4 and need the matching 2-inch step.\u003c\/p\u003e\u003cp\u003eIt isn't the same part as the FSQ85 2\" Visual Adapter (TKT37110) sold alongside it — that one is built for the Extender-QE 1.6x 2\" field flattener system rather than the bare focuser drawtube. See its own listing if that's your setup.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM72 x 1.0 male telescope-side thread:\u003c\/strong\u003e slides inside the FSQ-85EDX \/ FSQ-106EDX4 focuser drawtube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-inch (50.8 mm) accessory side:\u003c\/strong\u003e accepts standard 2-inch eyepieces and diagonals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePurely mechanical:\u003c\/strong\u003e no optical element, no change to focal length or focal ratio.\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\u003eVisual observing with 2-inch eyepieces\u003c\/strong\u003e on the FSQ-85EDX or FSQ-106EDX4.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting a 2-inch diagonal\u003c\/strong\u003e for wide-field visual use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRunning the FSQ-106EDX4 with its 1.6x Extender,\u003c\/strong\u003e where this adapter supplies the required 2-inch step.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt for the FSQ-85EDX and FSQ-106EDX4 specifically.\u003c\/strong\u003e The M72 thread is shared with other Takahashi refractors, but the 30 mm light path is tuned to these two.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdds 30 mm to the optical path\u003c\/strong\u003e — enough to matter against a flattener's backfocus spec or a tight focuser travel. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e lists this figure alongside the back focus each telescope needs.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt isn't interchangeable with the Normal Refractors version of this adapter,\u003c\/strong\u003e which runs a longer 40 mm light path built for the FS-102\/128\/130\/152 drawtube. Tell us your telescope model and we'll confirm the right one.\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 slides into the existing drawtube and the 2-inch accessory fits straight in.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich telescopes does it fit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe FSQ-85EDX, and the FSQ-106EDX4 both on its own and with the 1.6x Extender fitted.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this the same part as the FSQ85 2\" Visual Adapter?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — that one is built for the Extender-QE 1.6x 2\" field flattener system, a different point in the train with its own listing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does it add to my optical train?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e30 mm. Send us your full setup if you want to check it against your backfocus target.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2-inch adapter for the FSQ-85EDX and FSQ-106EDX4's focuser drawtube, adding 30 mm of light path — on its own or with the 1.6x Extender fitted.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047917801583,"sku":"TAK-TKP27110S","price":177.32,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/toa0401_2_6.jpg?v=1786936625","url":"https:\/\/ontariotelescope.com\/products\/takahashi-2-adapter-for-fsq85-ed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}