Good conditions in Melbourne last night but being a week night I couldn't spend much time outside. This was 42 minutes ( 21 x 2 min subs ) using a Sigma 50 - 200mm lens set at 200mm on my full spectrum modified Canon 550d without any filters.
Despite stopping down to f8 at 800iso, aberrations are still evident towards the corners, I'm suspecting the omission of my usual UVIR cut filter may have exacerbated the issue. I cropped the full frame to give a bit more detail of the galaxy 4976 below 4945. If fact, there are quite a few faint fuzzies when you scout around the full frame shot. I'm hoping for some clear skies by the weekend.
