I tried to install and use APT but just could not get it to work. I did manage to get AstroimageJ up and running which has allowed me to measure SNR on my images, so I did a little bit of testing on a previously captured image.
With my 102 frac, colour camera and Lum filter, I took a 2 min exposure of a Starfield near Polaris.
Looking at that image in AstroimageJ I can see stars at mag 12.10 have a peak value of 35,520 and an SNR of 550. Very usable I hope.
Edit: Interestingly the SNR calculator I linked to earlier predicted an SNR of 595 for that star and capture parameters. Not a million miles off.
