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With regards to clouds I’ll add my own experiences.
Yup clouds in a light polluted area will result in a lower mag reading due to reflected light as mentioned.
However after moving to a dark site (Siding Spring area) I found nights where I was in excess of mag 24 (IIRC sometimes as high as 25), for the obvious reason that the clouds have eliminated the last source of LP, the stars themselves.
I’m now in search of a site with no stars so I can get even better SNR….
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