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This was my lowly attempt at M83 through a 5" refractor the other night, trialling my new CCD. This is an unprocessed (apart from cropping) image, with no darks, flats, or bias subtractions, and is 3 light frames in total for 20 minutes on target (2 x 5, 1 x 10) - the SX cameras generally don't need dark frame subtraction (I have since put it in photoshop, and had to do 1 median filter pass to remove selected GREEN pixels - no red or bue to speak of).
M83 is a WONDERFUL target, one of my favourites. My only problem is until about 12am lately, it is RIGHT over a bloody streetlight! (Centaurus A is MUCH worse for me until MUCH later)
Still a touch purple, but that's all the darned light pollution from a combination of Hg vapour and incandescent bulbs, plus a neighbours annoying outside fluoro they insist on leaving on regardless.
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