Originally Posted by clarkstoncracker
Seriously? I've accidentally left a circ polarizer on at night and the pictures come out like that. Is that because the body is changing auto settings to compensate?
If you had it set on auto, who knows. You can lose around 1/3 to 1/2 stop of light with a polarizing filter, which would be compensated for by the camera w/ a longer shutter speed or smaller fstop.
Take your camera off auto and start shooting manual. You will learn alot more that way.