Askar 91F APO Refractor (91 mm f/5.6 Flat-Field) – Dark Clear Skies Askar PHQ65 adjustable squelch levels

adjustable squelch levels

the DC port can connect to DSO cooled cameras

we recommend using the official ZWO power adapter along with an appropriately sized power cable

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

Retekess T111 Restaurant Wireless Calling System

Askar 91F APO Refractor (91 mm f/5.6 Flat-Field) – Dark Clear Skies Askar PHQ65 adjustable squelch levelsAskar 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