On my Canon Xt, it always seems that when I take photos in Av mode my photos are underexposed. Doing some test shots in manual mode, I set my aperture to 5.6 and shutter at 800, and the photo was perfectly exposed. I switch to Av mode and set my aperture to 5.6, and the shutter speed that is chosen is 2000, and the picture ends up being underexposed. Am I missing something here? I am using spot metering, and metering directly of the subject on the same spot each time. Any ideas? Thanks!