{"product_id":"takahashi-fsq-106edx4-0-6x-f-3-reducer","title":"Takahashi FSQ-106EDX4 0.6x F\/3 Reducer","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe F\/3 0.6x Reducer takes the FSQ-106EDX4's native focal length down to 320mm at f\/3.0, one of the fastest focal ratios available for this astrograph. Four elements in three groups, fully multi-coated, deliver a Φ44mm image circle that Takahashi states covers a full 35mm sensor frame.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis reducer suits FSQ-106EDX4 owners chasing the fastest possible imaging speed — faint nebulosity, narrowband work under time pressure, or any target where cutting exposure time matters more than reach. At f\/3.0 it gathers considerably more light per unit time than the FSQ-106EDX4's native configuration.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 elements in 3 groups, multi-coated:\u003c\/strong\u003e built specifically to hold sharpness at an aggressive f\/3.0.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.6x reduction:\u003c\/strong\u003e takes the FSQ-106EDX4 to 320mm at f\/3.0.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ44mm image circle:\u003c\/strong\u003e covers a full 35mm frame per Takahashi's published figures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM72x1.0 mounting interface:\u003c\/strong\u003e threads directly into the FSQ-106EDX4's camera train.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBack focus is 56.2mm on the FSQ-106EDX4 with this reducer installed — the figure to build the rest of your imaging train around. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eFast narrowband and broadband imaging of faint nebulae and galaxies where exposure time is the limiting factor; wide-field deep-sky imaging where f\/3.0 shortens total integration time significantly versus a native-focal-ratio setup.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFSQ-106EDX4\u003c\/td\u003e\n\u003ctd\u003e320mm\u003c\/td\u003e\n\u003ctd\u003ef\/3.0\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eTakahashi also lists this reducer against the FSQ-130ED, where it produces a 390mm focal length.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eBuilt for the FSQ-106EDX4 primarily:\u003c\/strong\u003e Takahashi also markets it against the FSQ-130ED.\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 onto the FSQ-106EDX4's M72x1.0 interface, and the 56.2mm back focus figure is fixed once it's installed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFast deep-sky astrophotography on the FSQ-106EDX4, where f\/3.0 cuts exposure time significantly on faint targets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it's built to deliver a flat photographic image circle rather than a visual eyepiece path.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour camera's own T-ring or adapter to complete the connection at the 56.2mm back focus figure.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA fast 0.6x reducer that takes the FSQ-106EDX4 to 320mm at f\/3.0 across a full-frame-covering Φ44mm image circle, at a 56.2mm back focus.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047116361839,"sku":"TAK-TKA38581","price":2288.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka38581_2_6.jpg?v=1786914153","url":"https:\/\/ontariotelescope.com\/products\/takahashi-fsq-106edx4-0-6x-f-3-reducer","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}