Ok, I'm using a Nikon D300, with an SB-900 External Flash unit and SB-10 battery pack. My problem is that when I take the SAME picture, with the SAME light and all other setting equal (on a tri-pod, pictures taken back to back), the camera is wildly adjusting the white balance. If I take 3 photos back to back, each one will come out with different lighting and the white balance different on each one. Generally the camera auto sets the white balance, but even on Shutter Priority, Aperture Priority, or Full Manual I have this problem. Even when I take pictures 5 mins apart, but leave the camera in place, the white balance changes. Any suggestions?