I have a situation where I need to shoot some photos in front of a fairly large stained glass window and I'm wondering how to best approach it. I've not really had to worry about backlighting during formals in the past. (Just kind of getting started.) My thoughts were to shoot in manual, zoom in on the subject for a reading, re-frame the shot and use ETTL on my 580. Does that seem about right? I like to bounce my flash or use a diffuser of some type as well. I appreciate any help you might be able to provide.