ASKAR 0.75x REDUCER FOR 91F

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The Askar 0.75x Flattener/Reducer for the 91F is a triplet corrector compatible with up to full frame sensors. The 0.75x reduction factor shortens the focal ratio of the 91F to f/5 , shortening the exposure time and increasing the field of view. When paired with this flattener/reducer, the focal length of the 91F becomes 455mm, transforming it into an extremely capable widefield astrograph. The flattener/reducer has a backfocus requirement of 55mm, making it straightforward to connect common imaging trains. The 91F flattener/reducer has both M48 x 0.75 and M54 x 0.75 camera-side thread adapters. An internal M48 x 0.75 thread allows you to attach standard 2" filters. CNC-machined metal threaded end caps protect the optics of the reducer when not in use. Specifications Reduction factor 0.75 x Telescope connection M59 x 1 Camera connection M54 x 0.75, M48 x 0.75 (with built-in 2" filter thread) Image circle 44 mm Backfocus distance 55 mm Weight 300 g SKU ASA-91Fx0.75 Instructions Show more