I use GH2 & G3 cameras, when I set M the Auto ISO disappears. Never realised before that I can't have Manual with Auto ISO, seems so simple, I set the aperture and shutter speed and the camera sets the ISO. I don't use auto ISO as a rule because the aperture and shutter speed are never as I want them. With auto ISO set I find there are too many variables... In A, it's the ISO and shutter speed. In S, it's the ISO and the aperture. in P, it's all three. This seems such a simple requirement, makes me think I'm missing something fundemental. Update.......From the EM-5 manual....ISO sensitivity is fixed at ISO 200 in mode M top of page 89.