Hi Patrick I can remove the coma by stopping down, problem is that 4X5 sheet film has a top ISO of 100 and even w/ a 1 1/2 stop push (320 IS)) exposure is 90 minutes at F4 and at the time I was using a Celestron CG5 GEM. I just got my G11 today and I am planning a trip up Haleakala this weekend and may do a 3 hr exposure w/ the AllSkyCam. It's all experimental now, next step will be to hook up my 45mm Pentax SMC on the camera and also try a Schneider 58mm XL ( corrected wide angle for 4X5) I'm trying to get enough 'across the image' sharpness to make a 5' x 5' print. The idea is that the viewer approaches the photo and gets immersed in an eye filling view of the night sky, something that an average person never experiences. I think it will be a pretty nice presentation. aloha Rob