Hi, I have a wedding to be shot in January next year. I plan to hire 5D mark III. I have used it once for a marriage few months back. Last time when I used, I used Aperture priority mode most of the time. At places where the flash was lighting, I adjusted my exposure compensation to negative side by few stops to get correct exposure. This time I plan to use Manual mode with auto ISO. I was going through this video in youtube to understand M mode with auto ISO: At 1:09, he explains in 5D mark III, adjusting exposure compensation is not possible, if I use M mode with Auto ISO combo. Can any 5D mark III user confirm this pl.?