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I'd say tilt. I am not a collimation expert but I thought that would affect all stars not just one side of the image. What you are showing there I have seen on scopes with tilt and fixing the tilt stopped it.
As a generality DSLR images often have blown out white stars instead of coloured stars. I find it odd a 5D mk ii would do that. What ISO did you use?
Better to do shorter subs and more of them than longer subs and blowing out your stars.
What is happening with these white stars is your well capacity of the pixels is being maxed out. They are full and overflowing. So they go to max number of brightness which is white.
Same with the core of M83 which is yellowish.
I'd watch that when using DSLRs. I see it a lot and I think that is the only solution - ISO800 and 2.5 or 3 minutes instead of 5 minutes and lots of them.
You do see some DSLR images (usually a minority so this is a common problem) that retain star colours so they can do it.
CCD cameras usually have larger wells.
Greg.
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