I'm just comparing your Bode's Galaxy (f/3.3, 200mm, 120x21s) with my recent attempt (f/6.3, 600mm, 42x30s), and besides magnification, the result seems fairly similar - if anything, I think the dark sections of your image are less noisy. Your arrangement collected about 7.2 times as much light (ignoring magnification), so that's not surprising. I was using a Nikon D7500, so if the RPI HQ camera is comparing reasonably favourably with that, then yes that's not bad.
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