Quote:
Originally Posted by Slawomir
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But your point is still valid - the imaging/sampling geometry accounts for most of the sensitivity shown in the M42 - and also the relatively low resolution/image scale. As Sam pointed out, under suburban skies with an f7.5 OTA, you would need >200 hours to get the same M42 SNR
with that camera - so it is not just the camera.
None of this is to say that the camera is not very sensitive/low noise - it definitely seems that it is. However, that is by no means the whole story.