Custom white balance, do you use this often and if so why?

[ricstew]

Thank you Rick.....I get that but does the Auto w/b change in changing light conditions? If I started shooting in a room with tungsten and then turned on a fluro lamp and then used a flash............would the auto w/b change from what it thought was right.........from one condition to the next when the lighting changed? so that the three shots in the same room had different colour auto w/b?

[ricktas]

Thank you Rick.....I get that but does the Auto w/b change in changing light conditions? If I started shooting in a room with tungsten and then turned on a fluro lamp and then used a flash............would the auto w/b change from what it thought was right.........from one condition to the next when the lighting changed? so that the three shots in the same room had different colour auto w/b?

Yes! AWB is just that, it automatically chooses an appropriate white balance for EACH shot.