The Askar 131F 131 mm f/7.5 quadruplet APO optical tube is designed for astronomy enthusiasts and professional astrophotographers who demand flawless optical and mechanical performance. This telescope is an excellent choice for both visual observation and astrophotography.
With a 131 mm aperture and 983 mm focal length, the Askar 131F optical tube has an f/7.5 focal ratio. The colour-corrected ED triplet objective and integrated field flattener provide distortion-free, precise sharpness across the entire field of view. The telescope delivers a 44 mm image circle, making it ideally suited for imaging with full-frame sensors. As with Petzval optics, there is no need to calculate backfocus. With the optional 0.74x focal reducer, it becomes an exceptionally fast f/5.6 astrograph.
The dual-speed 3" rack-and-pinion focuser enables precise adjustment and rotates through 360°. M64, M54 and M48 threaded connections on the focuser ensure broad compatibility with a variety of accessories and cameras.
The practical tube rings, Vixen dovetail bar and carrying handle make the Askar 131F easier to mount and transport. The telescope also features two finder shoes for attaching additional accessories. The retractable dew shield helps protect the lenses from moisture and dew.
The Askar 131F optical tube weighs 7.9 kg and measures 878 mm in length, making it portable enough for trips or locations where easy transport is essential. The Askar 131F quadruplet APO optical tube delivers outstanding performance among premium optical solutions and is an excellent companion for astronomical adventures.
Key features of the Askar 131F apochromat:
- Aperture: 131 mm
- Focal length: 983 mm
- Focal ratio: f/7.5
- Colour-corrected ED triplet objective with field flattener lens
- 44 mm image circle, full-frame compatible
- 3" dual-speed focuser, rotatable through 360°
- Camera connection: M64, M54 and M48
- Tube rings, dovetail bar, carrying handle
- Two finder shoes on the optical tube
- Retractable dew shield
- Weight: 9.4 kg (with tube rings and dovetail bar)
- Length: 878 mm
- Portable travel telescope for visual observation and astrophotography
