re: put on Manual...
That's what I hate most about Auto ISO on my Nikon. It's great in A/S modes, but when I flick to Manual mode, I want full manual. Nine out of ten times I switch to M, it's because the camera's meter is not exposing the subject how I want or i want consistent exposures. Having the ISO change automatically based on what the camera thinks is right when in Manual mode is very frustrating to say the least!