{"product_id":"takahashi-rd-qb-0-73x","title":"Takahashi RD-QB 0.73x","description":"\u003ch2 dir=\"ltr\" style=\"text-align: center;\"\u003eTakahashi QB0.73x Focal Reducer for FSQ-85EDX\u003c\/h2\u003e\n\u003cul dir=\"ltr\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt for full-frame, not just APS-C.\u003c\/strong\u003e The QB0.73x is Takahashi's modernized answer to today's small-pixel, full-format sensors, giving the FSQ-85EDX astrograph the field correction those chips actually demand.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFaster and wider in one step.\u003c\/strong\u003e Screwing in the QB0.73x cuts your focal length by almost a quarter, down to 330 mm at F\/3.9, so you gather more light and frame wider without swapping telescopes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNew glass, tighter stars.\u003c\/strong\u003e Four lenses in two groups of new, highly refractive, low-dispersion ED glass cut chromatic aberration further, halve the RMS spot size at the edge of the field, and shrink star sizes by a third compared to the previous reducer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumbers that back it up.\u003c\/strong\u003e Spot radius comes in at 1.6 microns RMS at center, 1.9 microns at the APS-C periphery, and 3.9 microns at the full-frame edge, keeping stars tight corner to corner.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStraightforward mounting, with the right adapter.\u003c\/strong\u003e The QB0.73x screws directly onto the CAA (Camera Angle Adjuster); pair it with the CA-35 photo adapter (SKY-90, TATKA35201) to recover the 56.2 mm needed for a wide-field T-ring, standard camera, or ZWO camera.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZWO friendly with one extra piece.\u003c\/strong\u003e Running ZWO gear through the CA-35? The OU073 conversion ring from Optique Unterlinden picks up the M48 or M42 threads your accessory train needs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact enough to always keep in the case.\u003c\/strong\u003e At 78 mm x 63 mm and 520 g, the reducer adds virtually no bulk to your imaging kit.\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\u003eItem Number:\u003c\/strong\u003e TKA37580\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical Design:\u003c\/strong\u003e 4 lenses (2 groups)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrected Image Circle:\u003c\/strong\u003e 44 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Mechanical Interface:\u003c\/strong\u003e M72x1 thread, male\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Mechanical Interface:\u003c\/strong\u003e M56x0.75 thread, male\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal Back Distance:\u003c\/strong\u003e 72.2 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 78 mm x 63 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 520 g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Takahashi FSQ-85EDX 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\u003eQB0.73x Focal Reducer x1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"ltr\"\u003eNote: The CA-35 photo adapter (SKY-90, TATKA35201) and, for ZWO cameras, the OU073 conversion ring are required for full camera mounting and are sold separately.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":53107748176192,"sku":"TKA37580","price":680.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0717\/9904\/6464\/files\/1_8844608d-86ca-462a-bfcd-05eb5483d3c0.jpg?v=1788714222","url":"https:\/\/astroworldtelescopes.com\/products\/takahashi-rd-qb-0-73x","provider":"Astroworld Telescopes","version":"1.0","type":"link"}