A couple of full size shots of aurora taken with the 5D mk3 + 24 f1.4 lens at f2.8:
http://web.canon.jp/imaging/eosd/sam...wnloads/01.jpg
http://web.canon.jp/imaging/eosd/sam...wnloads/02.jpg
The processing and noise reduction look a bit heavy handed to me, but it is interesting to note the second hand shot is just 0.6 of a second.
Terry