{"product_id":"takahashi-visual-coupling-l-adapter","title":"Takahashi Visual Coupling L Adapter","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Coupling (L) is the long version of the coupling ring Takahashi supplies with several of its refractors — a plain mechanical ring, no lens or mirror, with a published 20 mm light path. That is twice the 10 mm of the Coupling (S) it sits beside on the system charts, where it carries no. 14L.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if a visual train comes up short of focus with the standard coupling in place, or if you are building a second train and want the longer of the two from the start.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoupling (L) — Takahashi part TKP00104:\u003c\/strong\u003e the long member of Takahashi's M55.9 coupling pair, listed as no. 14L.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20 mm light path:\u003c\/strong\u003e ten millimetres more than the Coupling (S), which is often enough to push a diagonal and eyepiece out to where they come to focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolid one-piece construction:\u003c\/strong\u003e nothing to adjust or align.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eUse it to join a diagonal, extension tube or eyepiece holder into Takahashi's 50.8 mm accessory sleeve system where the shorter Coupling (S) leaves the train sitting too far inside focus.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIt mates with the same M55.9 accessory chain as the Coupling (S), and the two thread into the same places — choosing between them is a question of how much length your train needs, nothing more. The 20 mm figure is what this ring adds to your optical path rather than something you would take off the part with calipers, and the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e lists it alongside the back focus target for each Takahashi telescope.\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 straight into the accessory chain it was designed for.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does it differ from the Coupling (S)?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eLength, and nothing else. The S is TKP00103 at 10 mm; this one is TKP00104 at 20 mm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it change magnification or add optical power?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it is a mechanical spacer, and its only effect on the train is the 20 mm it occupies.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe 20 mm coupling from Takahashi's M55.9 pair, for visual trains that need more length than the 10 mm Coupling (S) gives them. If you are not certain which of the two your telescope wants, send us the model and the rest of the train and we will work it out with you.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54054833619055,"sku":"TAK-TKP00104","price":62.92,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TKP00104_1.jpg?v=1787024985","url":"https:\/\/ontariotelescope.com\/products\/takahashi-visual-coupling-l-adapter","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}