SQA130 f/4.8
Askar
From $4,799.00
2 stores
The Askar SQA130 f/4.8 is a 130mm quintuplet Petzval astrograph featuring five internal lenses with two premium super-low dispersion (SD) glass elements that correct incoming light with extreme precision, delivering tack-sharp stars across medium format sensors. This design features an inherent flat field, meaning stars from corner to corner are sharp without needing an additional field flattener, with performance expected across today's largest sensors. With a 624mm focal length and fast f/4.8 focal ratio, it excels at capturing deep sky objects like nebulae and star clusters while collecting copious amounts of photons in short exposures. It comes ready for serious astrophotography with a 360° camera rotator, retractable dew shield, and M68-M54-M48 step-adapters for easy connection to various cameras.
Specifications
| Focal length | 624 mm |
| Total Length (Dew Shield Extended) | 764 mm |
| Central RMS Star Size | 2 μm |
| Included Adapters | M48, M54, M68 |
| Optical design | Quintuplet Petzval APO with 2 SD glass elements |
| Weight (With Tube Rings and Dovetail) | 11.76 kg |
| Image Circle | 55 mm |
| Back Focus Range | 46 mm |
| Focuser Type | 3.2 inch dual-speed rack and pinion |
| Total Length (Dew Shield Contracted) | 650 mm |
| Weight (OTA Only) | 9.18 kg |
| Focal ratio | f/4.8 |
| Star Point at 55mm Image Circle | 2.4 μm |
| Aperture | 130 mm |
| Dovetail Plate | 300mm Losmandy-style |
| MTF Value at Low Frequencies | 0.9% |