Askar 91F APO Refractor (91 mm f/5.6 Flat-Field) – Dark Clear Skies Helmet Camera Aperture: 80mm (no central obstruction)

Aperture: 80mm (no central obstruction)

Includes a brightness control

The ZWO ADC includes two high quality prisms of 1/10 Lamda surface quality

You will be suprised by the voice

9 kg Viewfinder   6x30 or 7x50

Askar 91F APO Refractor (91 mm f/5.6 Flat-Field) – Dark Clear Skies Helmet Camera Aperture: 80mm (no central obstruction)Askar 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