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What do you mean by rule? IMHO You never get the level of fine details you can access at long FL with a wide field set up like an FSQ or other refractor that gives you a couple of degrees field. Even with a sensor that has small pixels like ~3um you'll still get better details at 3m and over with a sensor that's 5um or more. It is also my experience that for a similar FL aperture plays a big role. FSQ is ~530mm and the hyperstar on the C11 is the same FL. The FOV is very similar, yet for all the optical sharpness of the FSQ the C11 on axis still levels it nicely. Years back Jase started doing high resolution mosaics to mimic widefield coverage. If I had a permanent setup that's what I'd do.
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