Askar 91F APO Refractor (91 mm f/5.6 Flat-Field) – Dark Clear Skies Askar PHQ65 Integrated Rotation Mechanism: Adjust brightness

Integrated Rotation Mechanism: Adjust brightness with polarizing filters

offering long-lasting protection

Many triplet + flattener setups still show corner distortion – the SQA130 is engineered specifically to avoid that

And improved the focuser

The Petzval design means no additional field flattener is required

Askar 91F APO Refractor (91 mm f/5.6 Flat-Field) – Dark Clear Skies Askar PHQ65 Integrated Rotation Mechanism: Adjust brightnessAskar 91F Flat Field APO Astrograph The Askar 91F is a powerful 91 mm f 5. 6 flat field apochromatic refractor designed for deep sky astrophotography. With its FRA series Petzval optical design, the 91F delivers a native flat field and pinpoint stars across APS C and full frame sensors without needing an additional field flattener. Key features Aperture: 91 mm APO optics with ED glass. Focal length: 500 mm at f 5. 6 balanced between wide field and