{"product_id":"takahashi-vari-ring-spacer","title":"Takahashi Vari-Ring Spacer","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Vari-Ring Spacer is a Takahashi M72 x 1.0 ring built for one job on the TOA telescope series: shifting how much reduction the matched reducer actually delivers. Takahashi publishes its light path at 17 mm — add it ahead of a TOA reducer and the effective reduction ratio changes with it.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you're running a TOA-series reducer and want to fine-tune the reduction ratio, or you're matching a published system chart that calls for the Vari-Ring specifically.\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 thread on both ends:\u003c\/strong\u003e male on one side, female on the other, so it drops straight into the M72 reducer chain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e17 mm light path:\u003c\/strong\u003e enough to noticeably shift a TOA reducer's effective ratio without swapping the reducer itself.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTakahashi part TKA31581\u003c\/strong\u003e — Takahashi's own \"Vari-Ring\" designation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eUse it between a TOA-series reducer and the rest of the imaging train to shift the effective reduction ratio, per Takahashi's published system chart for your telescope.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIt fits Takahashi's M72 x 1.0 accessory system used on the TOA series. The 17 mm figure is what it contributes to the optical train, not its physical length end to end — the male and female M72 threads seat differently than a caliper measurement would suggest. The \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e lists this figure next to the back focus target for each TOA model, so you can check the total spacing before ordering.\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 into the M72 reducer chain like any other ring in the system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAdjusting the effective reduction of a TOA-series reducer by changing the spacing ahead of it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work with reducers outside the TOA series?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTakahashi documents it for the TOA series specifically. If you're matching a different M72 reducer, send us your telescope and reducer model and we'll confirm the fit.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eAn M72 x 1.0 spacer built to dial in the reduction on a TOA-series reducer, adding 17 mm to the optical train in the process.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047917539439,"sku":"TAK-TKA31581","price":62.92,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka31581_2_6.jpg?v=1786936615","url":"https:\/\/ontariotelescope.com\/products\/takahashi-vari-ring-spacer","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}