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the DC port can connect to DSO cooled cameras
Integrated Rotation Mechanism: Adjust brightness with polarizing filters
4GHz generally offers better range
Many triplet + flattener setups still show corner distortion – the SQA130 is engineered specifically to avoid that
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 the DC port can connectAskar 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
US$ 157.02
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