I learned a way of noticing issues like this, saved me wasting my time. It says clear and I do see stars, but there is a large building in the distance a few miles away.
Usually it's totally visible with the windows and all, but there are those nights, when I just look at it, and I can barely make out of the shape of the windows and the building itself is hardly visible. I know it's clear, but not a good night to image, I'm gonna end up with blurry or barely any stars.
Another way is, take a picture of the sky with your cell phone, also try to count the stars, stay outside for 3-4 minutes with no flood lights or anything , don't look at your phone or any screen. Try to count the stars. If you can count the stars to a certain number, you got a problem. You shouldn't be able to count the stars, the fainter ones are invisible. You got something in the atmosphere. If you already set up and you got problems with polar alignment and have to mess around too much with gain and exposure with the guide camera and sharpcap still only counts a few, then there it is. Another sign.
Edited by unimatrix0, 05 August 2021 - 04:51 PM.