ASKAR 0.75x REDUCER FOR 91F
ASKAR 0.75x REDUCER FOR 91F is not in stock but it can be backordered.
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
