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Thanks for that, Ray; very interesting. I think it shows that an appropriate image scale is critical for decent sensitivity (as we all know from painful experience or learning from others).
Ignoring the clear case of poorly matched scope/camera (KAF-8300M on a 12-inch RC...), there's not *that* much difference in total integration time amongst the other contenders - a constant factor, rather than orders of magnitude.
Object selection, such as Orion Nebula versus a mag 10 galaxy with low surface brightness, will make more of a difference. However, I'm guessing that some of those scope combinations will have a much deeper limiting magnitude for the same integration/sub time.
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