I noticed that the ISO of a daytime photo in which a fill-flash was used was set at 400 under auto ISO. I can understand why my GH1 did that; it must have surmised that the ambient light was insufficient based on the fact that I was using the flash. As a result, the sky and a pond in the picture are badly blown. Do Pannies' algorithm jack up the ISO when fill-flash is used in daytime? If so, I'll make it part of my workflow to set the ISO around 100 in daytime going forward, instead of relying on the auto ISO.