I'll be going on vacation next week and planning to just bring my EOS-M and the 90EX this time around. I'll be using the flash for group pics indoors so it'll probably be dark. Since you can't swerve the 90EX, what's the best method to get a good shot of people without overexposing the flash? Just set it to P and face recognition?
I haven't played around too much with the 90EX but a few times I tried it out the flash was too strong and over exposed.