{"product_id":"takahashi-645-0-72x-reducer-qe-for-fsq-106-tka36580l","title":"Takahashi 645 Reducer-QE  0.72x (TKA36580L)","description":"\u003ch2\u003eTakahashi 645 Reducer-QE  0.72x \u003c\/h2\u003e\n\u003cdiv class=\"intro\" style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003e\u003cstrong\u003eThe focal reducer for medium-format imaging with the FSQ-106EDX4 refractor\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"intro\" style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003e\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe 645RD QE0.72x focal reducer is a high-performance reducer that further enhances the attractiveness of the FSQ-106EDX4 refractor, an astrograph already highly acclaimed by astrophotographers.\u003c\/p\u003e\n\u003cp\u003eIt consists of four large-diameter lenses, divided into four groups. The resulting focal length is 380 mm (F\/3.6) and the corrected image circle is 60 mm in diameter. The off-axis illumination has been improved. The amount of light at the periphery of the field is more than 70%. The amount of light over the 44mm covering the diagonal of a full-format sensor is more than 90%, which is about 50% more than the QE0.73X reducer. Vignetting is almost imperceptible on the cooled CCD and DSLR cameras available on the market today. Finally, the stars are punctual up to the edge of the field.\u003c\/p\u003e\n\u003cp\u003eThe QE0.73X reducer showed a slight violet chromatic aberration at wavelengths around 420 nm; this has been almost completely corrected. The diffraction spot was reduced to about 2\/3 of the spot size at an image circle diameter of about 44 mm. To increase light transmission, the lenses are coated with a broad-spectrum multilayer coating, which reduces reflections to less than half that of a conventional multilayer coating centred on wavelengths close to 500 nm. This reduces ghost images and increases transmission over the entire visible light range.\u003c\/p\u003e\n\u003cp\u003eThe mounting of the reducer unit on the telescope is special. Indeed, unlike other accessories, it is not screwed to the focus. The main body of the reducer is screwed directly to the rear end of the G4 lens, inside the optical tube of the FSQ-106EDX4, in order to reduce the load on the eyepiece holder; the set of adaptor rings on the camera body or camera therefore includes the reducer, which remains fixed. On the classic ED version, the Camera Angle Adjuster (TKP86200, sold separately) can be added to the mount, replacing the TKA36582 extension ring, to facilitate image framing.\u003c\/p\u003e\n\u003cp\u003eWith this 645 QE0.72X reducer, the FSQ-106EDX4 now has an image circle for medium format imaging, perfectly corrected for aberrations, at two different focal lengths: 530 mm (F\/5) and 380 mm (F\/3.6).\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003eCHARACTERISTIC\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003eTAKAHASHI 645RD QE0.72X FOCAL REDUCER\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003eOptical design\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003e4 lenses (4 groups)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003eCorrected image circle\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003e60 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003eInput mechanical interface\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003eM72x0.75 thread, male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003eOutput mechanical interface\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003eMetal back distance\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003e56.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003eTotal length\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003e74.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003e200 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eTakahashi 645 Reducer-QE 0.72x \u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003eManual \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003e\u003cbr\u003e\u003ca href=\"https:\/\/takahashi-europe.com\/assets\/uploads\/DOCS\/645RDQE0.72X_measure_JP.pdf\"\u003eSection and mounting of the 645RD QE0.72x focal reducer on FSQ-106ED refractor\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003e\u003ca href=\"https:\/\/takahashiamerica.com\/pages\/warranty-service?_pos=1\u0026amp;_psq=warranty\u0026amp;_ss=e\u0026amp;_v=1.0\" data-mce-fragment=\"1\" data-mce-href=\"https:\/\/takahashiamerica.com\/pages\/warranty-service?_pos=1\u0026amp;_psq=warranty\u0026amp;_ss=e\u0026amp;_v=1.0\"\u003eTakahashi 5-Years Warranty\u003c\/a\u003e \u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":43125733458149,"sku":"TAK-TKA36580L","price":3206.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/takahashi-645-reducer-qe-0-72x-tka36580l-astronomy-plus-1.jpg?v=1690484347","url":"https:\/\/istronomyplus.com\/products\/takahashi-645-0-72x-reducer-qe-for-fsq-106-tka36580l","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}