ASKAR 0.74x REDUCER FOR 131F
The Askar 0.74x Flattener/Reducer for the 131F is a triplet corrector compatible with up to full frame sensors. The 0.74x reduction factor shortens the focal ratio of the 131F to f/5.6, shortening the exposure time and increasing the field of view.
When paired with this flattener/reducer, the focal length of the 131F becomes 733.6mm, 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 131F 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 | 0.74 x |
|---|---|
| Telescope connection | M78 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 | 560 g |
| SKU | ASA-131Fx0.74 |
Instructions
