I need to be able to move around a conference hall, quickly taking pictures, which is how I used my 550 and 270. There is something obvious going on and I just can't track down what I'm doing wrong. Manually upping the flash exposure level certainly helps - but first I have to take a shot, check it, if too dark, up it, shoot again. I played around with the settings - EXT A seemed to be a wee bit better. I've checked every single setting in camera and in flash, and can't figure out what is going on. P mode, flash in ETTL II mode.nearly every indoor picture I take with the flash is the opposite of bright.positively dull - as if something is holding it back from firing it's full power for that shot. Flash forward - shooting with a 5D Mk 3 and a 600EX RT. Pointed it at a person 3-5 feet away in P mode and every picture looked nice and bright, never a problem. Need help fast - Flash issues - pictures look like there was no flash being used! As if the flashgun is not firing at full power - HELP! Okay, once upon a time, I had a 550 with a 270 EXII. Flash issues-pictures look like no flash being used! As if the flashgun is not firing at full power