There are two main types of dedicated astrophotography cameras: CCD and CMOS, both capable of capturing photos in high resolution. How to Choose an Astrophotography Camera. ... ZWO ASI224MC Color Camera ASI224MC - Great all-around. Our calculator, at typical seeing of 2-4", uses the Nyquist formula of 1/2 and the 1/3 to stop stars becoming square so the optimal range is between 0.67" and 2". (0.67 = 2 / 3, 2 = 4 / 2). In summary, we are using Nyquist as a starting point, with a slight tweak, because we are typically sampling very small, circular, stars.
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