{"product_id":"takahashi-1-25-adapter-for-2-diagonal","title":"Takahashi 1.25\" Adapter for 2\" Diagonal","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe 1.25″ Adapter for 2″ Diagonal converts any Takahashi 2″ (50.8 mm) diagonal or focuser drawtube down to a standard 1.25″ (31.75 mm) eyepiece barrel. It's a simple mechanical sleeve: 50.8 mm male on the telescope side, 31.75 mm female on the eyepiece side, with two knurled thumbscrews to lock the eyepiece in place. At 50 g and adding just 11 mm of light path, it lets you run 1.25″ eyepieces, Barlows and cameras through 2″ fittings without swapping the diagonal itself.\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 a Takahashi 2″ diagonal or 2″ focuser and also use 1.25″ eyepieces, a Barlow, or a compact accessory built on the smaller barrel.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e50.8 mm male sleeve:\u003c\/strong\u003e fits directly into any 2″ diagonal, focuser drawtube, or visual back.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e31.75 mm female barrel:\u003c\/strong\u003e accepts standard 1.25″ eyepieces, Barlows and accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo knurled thumbscrews:\u003c\/strong\u003e lock the inserted accessory in place without tools.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimal light path:\u003c\/strong\u003e adds 11 mm to your optical path — a figure worth accounting for against your back focus target. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for how it compares to other Takahashi adapters.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eSwitching between 1.25″ and 2″ eyepieces on the same 2″ diagonal; mounting a 1.25″ Barlow or compact eyepiece-based camera behind a 2″ visual back; running 1.25″ accessories on any Takahashi telescope drawtube fitted for 2″.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eFits the 2″ barrel on Takahashi diagonals, including the \u003ca href=\"\/products\/takahashi-2-mirror-diagonal-with-1-25-adapter\"\u003e2″ Mirror Diagonal\u003c\/a\u003e, which ships with this exact adapter included as standard. Adds 11 mm of light path — worth checking against your backfocus target 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's mechanical only.\u003c\/strong\u003e There's no optical element inside — it changes barrel size and nothing else.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIt adds 11 mm to your light path.\u003c\/strong\u003e On a spacing-critical imaging train, that's worth accounting for; the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e lists it alongside every other Takahashi adapter, and we're glad to help you check the total.\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 drops into the 2″ fitting and the two thumbscrews lock the eyepiece in place by hand.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eRunning 1.25″ eyepieces and accessories through a 2″ diagonal or focuser.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it come with the 2″ Mirror Diagonal?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTakahashi ships one with the 2″ Mirror Diagonal as standard; this listing is for the adapter sold on its own, for use on other 2″ fittings.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it affect imaging spacing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt adds 11 mm of light path, which the Back Focus Guide accounts for alongside the rest of your imaging train.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA 50 g mechanical sleeve that steps a 2″ (50.8 mm) diagonal or focuser down to a 1.25″ (31.75 mm) eyepiece barrel, adding 11 mm of light path along the way.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047080611951,"sku":"TAK-TKA00111","price":77.22,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka00111_1_3.jpg?v=1786913002","url":"https:\/\/ontariotelescope.com\/products\/takahashi-1-25-adapter-for-2-diagonal","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}