Hi. I just moved to Fairbanks area, and started shooting the Northern Lights. For my first aurora shots, I used Canon 5D Mark II + 17-40mm f4L. It came out ok... but I needed bump up the ISO to 1600-2500. The images are noisier than my taste. I'm thinking to buy new lens... I've been looking at Canon EF 24mm f/1.4L II or Canon EF 28mm f/1.8 USM. If anyone owns these lens, please share your opinions. Or any other suggestions? Thanks!