{"product_id":"takahashi-645-reducer-qe-0-72x-fsq-106","title":"Takahashi 645 Reducer QE 0.72x (FSQ-106)","description":"\u003ch2 dir=\"ltr\" style=\"text-align: center;\"\u003eTakahashi 645RD QE0.72x Focal Reducer\u003c\/h2\u003e\n\u003ch2 dir=\"ltr\" style=\"text-align: center;\"\u003efor FSQ-106EDX4\u003c\/h2\u003e\n\u003cul dir=\"ltr\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedium format, fully covered.\u003c\/strong\u003e The 645RD QE0.72x brings a 60 mm corrected image circle to the FSQ-106EDX4, opening the door to true medium-format imaging on an already acclaimed astrograph.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFaster and wider in one step.\u003c\/strong\u003e Four large-diameter lenses across four groups bring the focal length down to 380 mm at F\/3.6, so the FSQ-106EDX4 now covers two perfectly corrected focal lengths: 530 mm (F\/5) native and 380 mm (F\/3.6) reduced.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEdge-to-edge light, not just center punch.\u003c\/strong\u003e Off-axis illumination is over 70% at the periphery of the field and over 90% across the 44 mm full-frame diagonal, roughly 50% more than the previous QE0.73x reducer, so vignetting is nearly imperceptible on today's cooled CCD and DSLR cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eViolet fringing, addressed.\u003c\/strong\u003e The slight violet chromatic aberration near 420 nm seen on the QE0.73x is almost completely corrected here, with the diffraction spot cut to about two-thirds of its previous size across the 44 mm image circle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoated for cleaner light.\u003c\/strong\u003e A broad-spectrum multilayer coating cuts reflections to less than half that of a conventional coating centered near 500 nm, reducing ghost images and boosting transmission across the full visible spectrum.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounted where it counts.\u003c\/strong\u003e Instead of screwing to the focuser like a typical reducer, the 645RD screws directly to the rear of the G4 lens inside the optical tube, taking the load off the eyepiece holder rather than piling it on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFraming flexibility on the classic ED version.\u003c\/strong\u003e On the classic ED model, the Camera Angle Adjuster (TKP86200, sold separately) can swap in for the TKA36582 extension ring to make framing easier.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch1 dir=\"ltr\"\u003eSpecifications\u003c\/h1\u003e\n\u003cul dir=\"ltr\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical Design:\u003c\/strong\u003e 4 lenses (4 groups)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrected Image Circle:\u003c\/strong\u003e 60 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Mechanical Interface:\u003c\/strong\u003e M72x0.75 thread, male\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Mechanical Interface:\u003c\/strong\u003e None\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal Back Distance:\u003c\/strong\u003e 56.2 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal Length:\u003c\/strong\u003e 74.2 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 200 g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Takahashi FSQ-106EDX4 refractor\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch1 dir=\"ltr\"\u003eWhat's in the Box?\u003c\/h1\u003e\n\u003cul dir=\"ltr\"\u003e\n\u003cli\u003e645RD QE0.72x Focal Reducer x1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"ltr\"\u003eNote: The reducer mounts internally to the rear of the G4 lens rather than to the focuser. The Camera Angle Adjuster (TKP86200) for the classic ED version is sold separately.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":53107748110656,"sku":"TKA36580L","price":2290.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0717\/9904\/6464\/files\/1_32c59037-331c-407f-a083-73de0fd835c3.jpg?v=1788714468","url":"https:\/\/astroworldtelescopes.com\/products\/takahashi-645-reducer-qe-0-72x-fsq-106","provider":"Astroworld Telescopes","version":"1.0","type":"link"}