The Askar 0.76x Flattener/Reducer for the 80PHQ is a 3" corrector for full frame sensors. The flattener/reducer is a triplet design with one element of ED (Extra-low Dispersion) glass. The 0.76x reduction factor shortens the focal ratio of the 80PHQ to f/5.7, shortening the exposure time and increasing the field of view.
When paired with this flattener/reducer, the focal length of the 80PHQ becomes 456mm, 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.
|Reduction factor||0.76 x|
|Telescope connection||M68 x 1, M64 x 0.75|
|Camera connection||M68 x 1, M54 x 0.75, M48 x 0.75|
|Image circle||Full frame
|Backfocus distance||55 mm