white balance settings when using flash and other lighting?

Hi

I have a canon 350d and I'm curious what WB settings to use when I'm using flash along with available light. Do I use the flash WB - what happens to the background being exposed with available lighting?

Mostly I'll be doing this indoors where I have halogen lights, but it'd be good to know about outdoors too.

flash may be onboard or I have a 430EX too, if there is any difference in approach between the two.

thanks!

I use AWB 99% of the time. Your light colors will be different, you can fix that in RAW by doing a blended exposure in photoshop, or you can gel your flash to match the ambient. Gel is easier if you have gels, photoshop means less work when shooting but a bunch more later.

Another option is just to set the WB to the availiable light source's WB, and match the flash by using a filter. That's the reason a 'daylight to tungsten' correction filter is living on my flash all the time
edit: Note to self: Read Tim's post more carefull next time.

There was a discussion sometime ago of matching tungsten lighting: https://photography-on-the.net/forum/showthre​ad.php?t=82389 See my post #6

John