Askar SQA106 106mm f/4.8 Quintuplet APO

Quintuplet air-spaced lens design, including 2 pieces of SD glass. The SQA106 supports a 55mm image circle. The central star point has an RMS radius of less than 1.7 μm, and the star point at 55 mm is less than 2.2 μm, showing a super-fine star point. It also has excellent full-field illumi- nation and MTF data. The relative illumination can be higher than 90% at 44 mm image circle.

Integrated self-flattened design, no need for additional flatteners, and no need for additional calculation of the back focus. Between 48mm and 78mm connection dis- tance, users can directly use it for shooting after the OTA is in focus.

The dew shield is a retractable design that can be pulled out. It protects the lens from the impact of external and internal light and protects the lens itself.

Dual-speed rack-and-pinion large 2.8-inch rigid focus- er, which can be compatible with most motorized fo- cusers on the market. The focusing travel is 30 mm, and the focuser tube is engraved with high-precision scales. The entire focuser barrel is CNC machined with an anti-reflective internal design and matting paint, providing extra measures to eliminate stray light.