Whilst learning a lot from the foregoing thread, I've been playing with my own settings on the GXR. I have a question to ask (of course ) I have my iso set for Auto sub set 1600/1/60th. I though that this would mean that it wouldn't use a shutter speed lower than 1/60th but this doesn't seem to be the case. The setting says "change shutter speed" and then the options. Can anyone explain how this works please?