I live in a Class 7 City, and yesterday I decided to shoot 24 x 20 seconds exposures of the milky way at iso 5000, with a 18mm and 3.5 Aperture lens and a Nikon D5600, without a Star-Tracker.
I used the program "Sequator" for the stacking of my raw files, it removed most of the light pollution.
I noticed there is a few star trails if I zoom my image, and I also saw there is a big part of the background that is blue, and a small blue patch at the tree below the milky way.
I wonder if that is normal, maybe because I shot it at 3:40 am, or it's an issue with the stacking?
(I've had this camera for like a week.)
Sorry for low quality, it had to be 500kb or less.
Is this nice results for a "class 7" sky?