{"product_id":"takahashi-m55-9-extension-tube-l30","title":"Takahashi M55.9 Extension Tube L30","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe M55.9 Extension Tube L30 threads directly into the M55.9 x 0.75 accessory system shared across several Takahashi refractors. It carries no optics of its own — its whole job is moving a downstream accessory 30 mm further from the focuser, in one fixed step.\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 assembling a visual or imaging train on a Takahashi scope with an M55.9 x 0.75 drawtube thread and you need to add spacing without introducing a second reducer or flattener.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM55.9 x 0.75 thread:\u003c\/strong\u003e matches the drawtube thread used on several Takahashi refractor accessory chains.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30 mm light path:\u003c\/strong\u003e among the longer single spacers Takahashi offers on this thread, useful when a shorter ring won't close the gap to a flattener's backfocus target.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolid metal construction:\u003c\/strong\u003e a single-piece spacer with no moving parts and nothing to align.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eUse it to fine-tune spacing in an M55.9 visual or camera train — reaching a flattener's specified backfocus, for example, or adding clearance for a filter wheel or off-axis guider that would otherwise sit too close to the focuser.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIt threads into any Takahashi accessory using the M55.9 x 0.75 standard. The published 30 mm is what it adds to your optical train, not its physical length measured end to end with calipers — the two numbers differ because of how far the threads seat into the mating parts on each side. The \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e tabulates this figure alongside the back focus target for every Takahashi telescope, so you can work out whether you need it before you order.\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 directly into the M55.9 accessory chain with no adjustment to make.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAdding a fixed 30 mm of spacing to an M55.9 visual or imaging train.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for both visual and imaging setups?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — it's a mechanical spacer with no optical element, so it works the same way in either train.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eAn M55.9 x 0.75 spacer that adds 30 mm to your optical train. If you're not sure whether this is the spacing figure you need, send us your current train and telescope model and we'll work it out with you.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047915868271,"sku":"TAK-TKA18006","price":45.76,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/screenshot2024-09-18at120604pm_600x_b18d297c-b696-4412-a5fe-7f166c303f2b.jpg?v=1786936561","url":"https:\/\/ontariotelescope.com\/products\/takahashi-m55-9-extension-tube-l30","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}