OTA · 2023–
Askar FRA500
Key specifications
| Aperture | 90 mm |
|---|---|
| Focal length | 500 mm |
| Focal ratio | f/5.6 |
| Optical design | Other |
| Back focus | 158 mm |
| Weight | 4.1 kg |
All specifications
| Focuser type | 3.5" dual-speed (1:10) |
|---|---|
| Tube length | 452 mm |
| Dovetail | Losmandy |
About
90mm f/5.6 quintuplet (3+2) air-spaced Petzval flat-field astrograph with two ED elements. 500mm focal length over a 55mm image circle, built-in flat-field correction, 3.5" dual-speed rack-and-pinion focuser; ships with Losmandy-style dovetail and M68/M54/M52/M48 adapters.
Where to buy
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