Due to my inexperience with the Canon 20D and using flash units in general, I stupidly set the white balance to incadescent, which looks great for the background of the reception, but foreground subjects illuminated by a "pre-balanced" flash tinted the subjects bluish. I had a very difficult time correcting this in Photoshop (every photo was slightly different). Trial by error. Never again! Good thing I didn't charge, otherwise I'd feel really guilty. (Next time I'm charging!)
