I appreciate all the info thus far. Question: Using a slow shutter speed to get more use out of the ambient light... won't shooting indoors with incandescent lights in the room give me some weird (yellowish) color cast in some areas?
I feel compelled to elaborate on my previous reply to this question. First, you can always color correct your photo in post if it comes out with a terrible yellowish hue. This is different than "color cast" that might be caused by bouncing your flash off a yellow wall. Second, If you are trying to match your flash temp to the tungsten temp of the incandescent light, you should consider a flash gel. However, as stated in my last post, I don't think you should really be too concerned about this with the scenario you describe (I envision a few quick group shots without much time to set up). To provide an example, here is a shot that had both un-geled flash and tungsten ambient lighting. Technically they did not match, but they were perfectly acceptable….IMO. Pardon my son's goofy expression![/URL]