While i'm on a roll asking fundamental DSO imaging questions..
With an unmodded DSLR, is there such a thing as an "ideal"
total length of time for your lights?
Most people seem to do between 60-90 minutes of "lights" time - is that just because any longer and you need to start thinking about meridian flips, or is there some deeper reason why you don't keep imaging the same object all night long and getting 2-3 hours or more of "light" time?
Surely the longer total lights means less noise and potentially more signal, a smoother image that can withstand more stretching etc..?
Thoughts?