Askar FRA600 Refractor 108mm f/5.6
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Vai al moduloAskar FRA600 108mm f/5.6 – High-Performance Petzval APO Astrograph
The Askar FRA600 108mm f/5.6 is the flagship model of the FRA series, engineered for astrophotographers who demand exceptional image sharpness and minimal aberrations. Its optical system is a modified Petzval quintuplet, featuring a front triplet with two ED glass elements and a rear doublet corrector, delivering outstanding chromatic and geometric correction.
The 66 mm fully corrected image circle ensures pinpoint stars across large-format sensors, while the 80 mm rear doublet provides excellent illumination and minimal vignetting.
Precision Mechanics and Professional Stability
The premium optics are paired with a robust mechanical structure designed to support high-end imaging setups. The FRA600 features a 4.2" Rack & Pinion focuser with 1:10 fine adjustment, offering smooth and stable focusing even with heavy cameras and accessories. The retractable dew shield reduces the total length to 493 mm for easier transport and storage.
Connectivity and Accessories
- Thread options: M54x0.75 and M48x0.75 via included conical adapter
- Standard backfocus: 55 mm
- 2" eyepiece holder with 1.25" reducer
- Losmandy-D dovetail plate for solid EQ mounting
- Anodized tube rings with integrated handle
- Aluminium hard case included
A dedicated optional focal reducer is available, bringing the system down to F/3.9 while maintaining full-frame illumination—ideal for shorter exposure times and wide-field imaging.
Technical Specifications
| Aperture | 108 mm |
| Focal length | 600 mm |
| Focal ratio | f/5.6 |
| Optical design | Modified Petzval quintuplet (dual-ED triplet + rear doublet) |
| Total length | 493 mm (dew shield retracted) |
| Weight | 7.8 kg |
| Focuser threads | M108x1, M90x1, M68x1 |
| Maximum backfocus | 160 mm from the M90x1 thread |
Quality Control and Professional Support
Every telescope undergoes a full optical and mechanical inspection before delivery to ensure perfect collimation and optimal performance. ASKAR is known for strict interferometric and optical tests applied to all its apochromatic astrographs.
ASKAR 4" Rack & Pinion Focuser with Integrated Rotator
The new ASKAR 4" focuser includes a 360° rotator that keeps the camera aligned optimally for imaging composition. The robust Rack & Pinion system handles heavy imaging trains without flexure, while the 1:10 fine adjustment enables precise focusing for deep-sky astrophotography.
Additional Technical Features
| Telescope tube weight | 6.5 kg |
| Packed weight | 7.8 kg |
| Included adapters | M108x1, M90x1, M54x0.75, M48x0.75, 2"/1.25" |
| Included accessories | Tube rings, handle, dovetail plate, conical adapter, manual, inspection sheet |
The Askar FRA600 108mm is an outstanding solution for wide-field astrophotography with full-frame sensors, combining premium optical performance, precise mechanics and versatile imaging configurations for advanced astrophotographers.