Hi Bert
Great Chrissy Present!
and WOW, Barnard's loop in 10sec!!!
I ran your image through ABE to see what it could do with the vignetting. A little more adjusment in PSCS2 and this is what I got (I also used IP's Halo reduction tool).
I tell you what though, those 12 Mp images stretch the PC's capability to the limit!!!
Cheers