I'm not really into flash photography very much, but I can imagine situaltions where I'd really like to have one. For instance, looking back at old shots, I have some taken in shade near a lake where the lake is the background. My cousin and aunt are in the immediate foreground, and I needed a flash to get both them and the lake properly exposed. Here's my question: since the flash and the sun are different soures of light, is it possible to set the white balance separately for the flash-exposed foreground and the sunlit background? I'm guessing they would be pretty close on a cloudless day, but with some partial clouding the flash would probably be a higher temperature WB.
This probably won't impact my shooting very often, if ever, but I'm contemplating getting a flash and have been spending a lot of time thinking about how I would use it.