Askar provides a brand-new F3.9 full frame reducer for FRA400 astrograph, further reducing the focal length and thus shortening the exposure time on its original 400 focal length and f/5.6 focal ratio design basis. The reduction factor is 0.7×, and the reduced focal length is 280mm, which can satisfy most deep-sky astrophotography. The back focus is standard 55mm. The reducer has built-in M48×0.75 thread, easy for the attachment of 2″ filters.
Accessories, Askar Telescopes
Aksar 2.5” F3.9 Full Frame Reducer for FRA 400
₹20,849.00 excl. 18% GST
Available on backorder
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