OTA · 2025–
Askar 131F
Key specifications
| Aperture | 131 mm |
|---|---|
| Focal length | 983 mm |
| Focal ratio | f/7.5 |
| Optical design | Quadruplet APO |
| Back focus | 91 mm |
| Weight | 7.9 kg |
All specifications
| Focuser type | 3" rack & pinion, 1:10 fine adjustment |
|---|---|
| Tube length | 878 mm |
| Dovetail | Losmandy |
About
131mm f/7.5 self-flattening quadruplet astrograph (3+1) with one ED element. 983mm focal length over a full-frame flat field; ships with a photographic extension tube carrying a built-in 2" filter thread and M48/M54 adapters. Launched alongside the 111F.