OTA · 2020–
Askar FRA400
Key specifications
| Aperture | 72 mm |
|---|---|
| Focal length | 400 mm |
| Focal ratio | f/5.6 |
| Optical design | Other |
| Back focus | 140 mm |
| Weight | 2.56 kg |
All specifications
| Focuser type | 3" rack-and-gear with rotator |
|---|---|
| Tube length | 317 mm |
| Dovetail | Vixen |
About
72mm f/5.6 quintuplet (3+2) Petzval flat-field astrograph with two ED elements, the original of the FRA family. 400mm focal length over a 44mm full-frame circle, rotatable 3" rack-and-pinion focuser. Optional FRA72RD 0.7x reducer yields 280mm f/3.9.
Where to buy
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