It's by no means the greatest pic but I'm quite happy with it and M51 is also a first for me.
Still got no idea what I'm doing so any pointers will help.
This was the best of a bad lot, my subs were too dark to stack the comet itself.
It's a touch over 30 minutes worth of 45second subs at 270mm, f9.0, ISO1600. With the 450D and Polarie.
No flats as I can never get them right with just camera and lens.