{"product_id":"takahashi-mewlon-cr-fsq106edx4-0-73x-reducer","title":"Takahashi Reducer-CR 0.73x for Mewlon CRS, CCA-250 and FSQ-106EDX4","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Reducer-CR 0.73x is Takahashi's focal reducer for the CCA-250 and the Mewlon-250CRS and Mewlon-300CRS Cassegrains, trading some of each telescope's long native reach for a meaningfully faster, more deep-sky-friendly focal ratio. On the CCA-250 it brings the system down to f\/3.6; on the Mewlon-250CRS and Mewlon-300CRS, to f\/7.3 and f\/7.2 respectively.\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 CCA-250, Mewlon-250CRS, or Mewlon-300CRS and want a faster system for deep-sky imaging than the native long-focus Cassegrain configuration provides.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShared across three Cassegrains:\u003c\/strong\u003e one part, with the resulting focal length and ratio set by which telescope it is mounted on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeaningful speed gain:\u003c\/strong\u003e the CCA-250 goes from f\/5.0 native to f\/3.6; the Mewlon CRS pair drop from roughly f\/10 native into the f\/7 range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e38–35mm image circle\u003c\/strong\u003e depending on host telescope, with a matched back focus for each.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe CCA-250, Mewlon-250CRS, and Mewlon-300CRS are Dall-Kirkham and related Cassegrain designs built natively for long-focus planetary and lunar work. The Reducer-CR 0.73x shortens the effective focal length on each by roughly the same 0.73x factor, but because their native ratios differ, the resulting speed gain is most dramatic on the CCA-250 (f\/5.0 to f\/3.6) and more moderate on the two Mewlon CRS models (f\/9.9–f\/10.0 down to roughly f\/7.2–f\/7.3).\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eFaster deep-sky imaging on the CCA-250, Mewlon-250CRS, or Mewlon-300CRS — galaxies, planetary nebulae, and globular clusters where the native long-focus configuration would otherwise demand long exposures.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes this reducer for three telescopes, with a fourth pairing available through an additional adapter.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eNative\u003c\/th\u003e\n\u003cth\u003eWith RD CR0.73x\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\u003eCCA-250\u003c\/td\u003e\n\u003ctd\u003e1250mm f\/5.0\u003c\/td\u003e\n\u003ctd\u003e910mm f\/3.6\u003c\/td\u003e\n\u003ctd\u003eΦ38mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMewlon-250CRS\u003c\/td\u003e\n\u003ctd\u003e2500mm f\/10.0\u003c\/td\u003e\n\u003ctd\u003e1825mm f\/7.3\u003c\/td\u003e\n\u003ctd\u003eΦ35mm\u003c\/td\u003e\n\u003ctd\u003e72.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMewlon-300CRS\u003c\/td\u003e\n\u003ctd\u003e2960mm f\/9.9\u003c\/td\u003e\n\u003ctd\u003e2160mm f\/7.2\u003c\/td\u003e\n\u003ctd\u003eΦ35mm\u003c\/td\u003e\n\u003ctd\u003e72.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eTakahashi also lists this reducer as compatible with the FSQ-106EDX4 when used with the separate CA35 (SKY90)-style adapter, part TKA35201. The same three Cassegrains also take the companion Mewlon CR Extender 1.5x, which Ontario Telescope carries separately, for the opposite trade-off. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for spacing detail.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eFSQ-106EDX4 use needs a separate adapter (TKA35201).\u003c\/strong\u003e\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 to the rear cell with a fixed back focus on each host telescope, so there is no spacing to work out on the CCA-250 or Mewlon CRS pairings.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFaster deep-sky imaging on the CCA-250, Mewlon-250CRS, or Mewlon-300CRS.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the same part fit all three Cassegrains?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — one reducer, with a different resulting focal length, ratio, and image circle depending on the host telescope.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it on my FSQ-106EDX4?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTakahashi notes compatibility with a separate adapter (TKA35201).\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Reducer-CR 0.73x speeds up the CCA-250, Mewlon-250CRS, and Mewlon-300CRS for deep-sky imaging — down to f\/3.6 on the CCA-250 and into the f\/7 range on the Mewlon CRS pair — and extends to the FSQ-106EDX4 with an additional adapter.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047128420463,"sku":"TAK-TKA82580","price":986.7,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka82580-2_6.jpg?v=1786914613","url":"https:\/\/ontariotelescope.com\/products\/takahashi-mewlon-cr-fsq106edx4-0-73x-reducer","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}