The Askar 71F 71 mm f/6.9 quadruplet APO tube is designed for astronomy enthusiasts and professional astrophotographers who desire impeccable optical and mechanical performance. This compact and ultra-portable telescope is an excellent choice for both visual and photographic purposes.
The Askar 71F tube, with a 71 mm diameter and 490 mm focal length, features a focal ratio of f/6.9. The color-corrected ED triplet objective and built-in field flattener lens ensure distortion-free, precise sharpness across the entire field of view. The telescope provides a 44 mm image circle, making it ideal for imaging with full-frame sensors. A notable advantage of the system is that, similar to Petzval optics, there is no need to calculate the backfocus value. With the optionally available 0.75x reducer, it transforms into an extremely fast f/5.1 astrograph.
The dual-speed, 2.4" rack-and-pinion focuser allows for precise adjustments and can rotate 360°. The focuser features M64, M54, and M48 threaded connections, ensuring wide compatibility with various accessories and cameras.
Thanks to the practical tube rings, Vixen-style dovetail bar, and handle, the Askar 71F is easy to mount and transport. The telescope also includes two dovetail shoes for attaching additional accessories. The retractable dew shield helps protect the lenses from moisture and dew.
The Askar 71F tube alone weighs just 2.5 kg and measures 373 mm in length, making it ultra-portable and an ideal choice for trips or locations where easy transportability is crucial. The Askar 71F quadruplet APO tube delivers outstanding performance in quality optical solutions, making it an excellent companion for astronomical adventures.
Particularly useful for nature observers, the basic package includes an amici prism providing an upright image, as well as 20 mm and 8 mm eyepieces, offering 24.5x and 61x magnification, respectively.
Main features of the Askar 71F apochromat:
- Diameter: 71 mm
- Focal length: 490 mm
- Focal ratio: f/6.9
- Color-corrected ED triplet objective and field flattener lens
- 44 mm image circle, full-frame compatible
- 2.4" dual-speed, 360° rotatable focuser
- Camera connection: M64, M54, and M48
- Tube rings, dovetail bar, handle
- Two dovetail shoes on the tube
- Retractable dew shield
- Weight: 3 kg (with tube rings, dovetail bar)
- Size: 373 mm
- Ultra-portable travel telescope for visual and photographic use
- 1.25" amici prism
- 20 mm and 8 mm eyepieces
