{"product_id":"takahashi-2-adapter-for-fs-102-128-130-152","title":"Takahashi 2\" Adapter for FS-102\/128\/130\/152","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi's 50.8 Adapter for Normal Refractors (TKP27110) is the ring that lets an FS-102, FS-128, FS-130 or FS-152 take standard 2-inch eyepieces and diagonals. These four telescopes share a 2.7-inch drawtube, and a bare 2-inch barrel simply won't fit it without this step-down in between.\u003c\/p\u003e\u003cp\u003eTakahashi publishes a light path length of 40 mm for the adapter — not its physical size, but what it adds to the train once it's threaded on. At 40 mm it's a meaningful chunk of spacing, worth accounting for if you're already tight on focus travel or working out backfocus for a flattener downstream.\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-102, FS-128, FS-130 or FS-152 and want to run 2-inch eyepieces or a 2-inch diagonal on it.\u003c\/p\u003e\u003cp\u003eIt won't help on other Takahashi models, though — the FSQ-85ED and FSQ-106EDX4 use the same M72 thread but a shorter, 30 mm version of this adapter, sold separately.\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 fits the 2.7-inch drawtube of the FS-102\/128\/130\/152 series.\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 a step-down ring, with no optical element and no effect on 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 wide-field eyepieces\u003c\/strong\u003e on the FS-102\/128\/130\/152.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting a 2-inch star diagonal,\u003c\/strong\u003e for the wider true field it gives over 1.25-inch.\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 FS-102, FS-128, FS-130 and FS-152\u003c\/strong\u003e and their shared 2.7-inch drawtube — it isn't a universal 2-inch adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdds 40 mm to the optical path.\u003c\/strong\u003e That's the figure to weigh against your focuser's inward travel and against any flattener's backfocus spec down the line. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e lists it 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's specific to the 2.7-inch drawtube telescopes named above.\u003c\/strong\u003e Tell us your FS model if you're not sure which drawtube it uses and we'll confirm.\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 onto the drawtube and the 2-inch accessory slides straight in.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich telescopes does it fit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe FS-102, FS-128, FS-130 and FS-152, which all share a 2.7-inch drawtube.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does it add to my optical train?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e40 mm, and that's worth checking against your focus travel before you order — send us your setup and we'll confirm it fits.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work on the FSQ-85ED?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — that telescope takes a shorter version of this adapter, at 30 mm of light path, sold as its own part.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2-inch adapter for the FS-102\/128\/130\/152's 2.7-inch drawtube, adding 40 mm of light path to the train.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047917506671,"sku":"TAK-TKP27110","price":177.32,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/toa0400_2_6.jpg?v=1786936610","url":"https:\/\/ontariotelescope.com\/products\/takahashi-2-adapter-for-fs-102-128-130-152","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}