This is a stupid question.
I have the 270ex flash that I use all the time, but tomorrow is a special event and i had to borrow a 580ex. The flash is a tank and it's more than capable, but I'm mainly wondering how to both get enough light at a subject without washing his face out and overpowering him and the people around him. I've used this baby before, I love the power and the mega-bounce I get off of it but I've had instances where the latter happens and ruins a shot (then again, I would shoot in JPEG like a doofus, not anymore) and I'm wondering if there's a way to find a good midpoint?
I've been toying with it, but I realize most of the buttons are for master and off camera control so I'll just be leaving it on ETTL. Anything else I should know? And anything I can do to have a balance between fill light and good flash brightness? Or is FEC gonna be it?