SQA70
Askar
From $1,595.00
3 stores
In stock
The Askar SQA70 is a premium quality quintuplet air-spaced ED glass Petzval Astrograph designed specifically for astrophotography. With 70mm aperture, 336mm focal length, and f/4.8 focal ratio, this refractor excels at wide-field imaging of nebulae and galaxies. The inherent flat field design means stars from corner to corner will be sharp without the need for an additional field flattener, making it ideal for full-frame camera systems. The central star point has an RMS radius of less than 1.84 μm, and the star point at the corner is less than 2.4 μm, demonstrating exceptional optical performance for demanding astrophotography applications.
Specifications
| Aperture | 70 mm |
| Weight (OTA) | 3.68 kg |
| Focuser Travel | 32 mm |
| Corner Star RMS Radius | 2.4 μm |
| Total Length (Dew Shield Retracted) | 332 mm |
| Minimum Illumination | 90% |
| ED Glass Elements | 2 |
| Focuser Type | 2.5 inch Dual-Speed Rack-and-Pinion |
| Rear Thread Adapters | M54, M48, M42 |
| Focal length | 336 mm |
| Image Circle | 44 mm |
| Rotator | 360 degrees |
| Finder Bases | 2 |
| Central Star RMS Radius | 1.84 μm |
| Focal ratio | f/4.8 |
| Back Focus Range | 37 mm |
| Mount Connection | Vixen-style dovetail |
| Optical design | Quintuplet Petzval APO |
| Total Length (Dew Shield Extended) | 372 mm |