1.7. White Balance Tips and Tricks
Tips for using a white/gray card: When measuring WB with a gray or white card keep in mind that your camera does not need to focus on the card. In PRE mode, it will not focus anyway, since it is only trying to read light values, not take a picture. The important thing is to put your lens close enough to the card to prevent it from seeing anything other than the card. Three or four inches (about 75mm-100mm) away from the card is about right for most lenses.
Also, be careful that the source light is not casting a shadow from the lens onto the card in a way that lets your lens see some of the shadow. This will make the measurement less accurate. Also, be sure that your source light does not make a glare on the ...
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