I've never really spent a whole long session on M20, but along the way I've accrued 3 1/2 hours of data over the past 2 years at a mix of suburban and dark sites. The data is all on an EOS 60D, but some is with a 150mm f/5 reflector and some with a 200mm f/5 scope. I think the combination of data makes for quite a pleasing view (my setup works well for images with strong signal), Scope aperture in 2015 and poor seeing over the long weekend (the last hour of data with the 200mm scope) was not enough to resolve the M20 H-H object & EGG. I was pretty happy to see a bit of the blue reflection nebulosity that surrounds the emission 'rose' come out in the final image.
A larger view is here.
Still quite modest at 3.5 hours!
