Had another crack at M83 this year. I spent a bit over 10hrs gross on this, and netted about 6hrs of data. I was shooting mere 35s exposures at high gain (250) for all LRGB filters to try and optimize resolution. The problem with that is with SGP and my imaging computer, the overhead between downloading frames, settling and filter changes it about 17-18s, so I lost a *heap* of imaging time doing it that way.
On the bright side, I got some of the sharpest broadband subs I've gotten, with some G frames down to 1.6" The resulting super luminance had a median FWHM of 2.17" in the central 1000px of the frame (flattener spacing isn't *quite* perfect, so I tend to focus on the middle :p)
Not sure about the processing on this one. Optimised for the stars and thus compromised some other aspects of the image. May re-do it yet...
Bigger, higher quality version on Astrobin
here.
Edit: Replaced image with re-processed version.