Ive been playing around with the G2 (not recording anything as yet as I don't have an SD card.) I was fooling around with the manual exposure mode. Interestingly, as I adjusted both the shutter speed and the aperture, there was no change in brightness of the image in the EVF, unlike a video camera. Though what really puzzled me was that the viewfinder image did fluctuate in brightness when I panned the camera, even though it was still in manual exposure mode. Essentially, it was acting like it was in auto exposure mode - adjusting to differences in brightness in different parts of the room that I was in. Should I be concerned about this when shooting in manual exposure mode? Of course during this mode, I would prefer to have complete control.