Why is there a P mode and a full retarded mode? My film SLR just has P, AV, AT and M so I assume P is full retarded but I can do exposure comp. why the fuck does my digital camera have full retard, P, AV, AT and M? I don't understand what P does that full retard or AV/AT don't. I also don't understand why I would ever use something like P over just using AV? I pretty much just use AV like 99% of the time