71F
Askar
From $659.00
3 stores
In stock
The Askar 71F is a compact quadruplet APO refractor engineered for both wide-field astrophotography and visual observing. Featuring a 71mm aperture and 490mm focal length at f/6.9, this flat-field design delivers sharp, pinpoint stars across full-frame sensors without requiring additional flattening optics. Its air-spaced ED glass construction minimizes chromatic aberration, while the lightweight 2.5kg optical tube and dual-speed 2.4" focuser with electronic focuser compatibility make it an excellent choice for portable imaging rigs and versatile observing sessions.
Specifications
| Aperture | 71 mm |
| Weight (OTA Only) | 2.5 kg |
| Focuser Fine Adjustment | 1:10 |
| Electronic Focuser Compatible | ✓ |
| Filter Thread | 2 |
| Weight (With Rings and Dovetail) | 3 kg |
| Full Frame Sensor Support | ✓ |
| Image Circle | 44 mm |
| Optical design | Quadruplet Air-Spaced APO with ED Glass |
| Focuser Type | Dual-Speed Rack and Pinion |
| Included Eyepieces | 8mm (60x) and 20mm (25x) |
| Focal length | 490 mm |
| Field Rotator | 360 degrees |
| Focal ratio | f/6.9 |
| Dovetail Plate | 230mm Vixen Standard |
| Focuser Size | 2.4 in |
| Flat Field Design | ✓ |
| Included Diagonal | 1.25 in |
| Camera Adapters | M48x0.75 and M54x0.75 |