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Assuming I am shooting in Aperture priority with Evaluative Metering on 5D Mk III, and have a 580EX in M mode. Does the camera assume there is no flash and set a shutter speed based on ambient? Thanks! Wayne

Hello! Newbie and first time poster. I am not an experienced flash user, so wasn't sure what to expect when shooting in burst mode at a party over the weekend. I had the 580 set in ETTL and angled up to bounce off the ceiling. I had the 5D in normal ...