Hi, i've just received my wedding photos after waiting for it agonisingly for 3 months. im a street and landscape photographer and always wonder how wedding photographers do their job. i got the soft copy via dvd and im quite amaze that most of my wedding photographer (chosen by my wife) photos have a setting of ISO 6400. isn't that setting will have grainy effect or blur? i thought high iso only use when there is limited light around and my wedding day weather was a bright sunny day. can someone enlighten me on this kind of setting?