I'm not sure where else to post this... maybe the mods can move it later? Anyway, this is a trick I learned from a fellow D200 user a while back and I thought I'd share it with everyone. With a camera that has a "PRE" WB setting where you can shoot a custom white or gray card on-location, you can make perfect WB settings without even using a card! This is what you need to do: Set your camera into Shutter-priority with a speed of 1" or slower. Set yourself up to shoot a PRE setting (for D200: select WB>PRE>d-0 or whatever, and then hold down WB until PRE is blinking) Frame a part of the scene that you want to white balance, and take a photo --- BUT when you do this, wave your camera around so the image is a big blur. This blends all the colours, essentially making it a white card with colour cast. Make sure that your LCD reads "good" after taking the PRE setting. Then, return to normal shooting and take a normal shot of the scene, you should see that it has perfect WB! You can check out what you took in the camera's menu. In D200, go to Shooting Menu > White Balance > PRE and you can see the image that it used to measure WB from.