One other tip. When facing the congregation, or any group do not do as I did one day. The scene was good,but the camera did not fire the flash. My mouth made the words "S-O-B " very clearly to the entire 200+ people seated in the Cathedral Chapel. Fortunately it was the wedding of my college rommate and good friend. 40 years later we still meet for lunch every few months. Time exposure shots work well in churches and chapels.