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Canon EOS 40D Guide to Digital Photography by David D. Busch

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Adjusting White Balance

I showed you how to adjust white balance in Chapter 3, using the 40D’s built-in presets, white balance shift capabilities, setting exact color temperatures, and white balance bracketing (there’s more on bracketing in Chapter 4, too).

In most cases, however, the EOS 40D will do a good job of calculating white balance for you, so Auto can be used as your choice most of the time. Use the preset values or set a custom white balance that matches the current shooting conditions when you need to. The only really problematic light sources are likely to be fluorescents. Vendors, such as GE and Sylvania, may actually provide a figure known as the color rendering index (or CRI), which is a measure of how accurately a particular ...

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