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

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Clear All Custom Func (C. Fn) Settings

This choice, located at the same level as the Custom Function categories, can be used to clear all camera Custom Functions. Press the Set button, then rotate the Quick Control Dial to choose either Cancel or OK. Press the Set button to confirm. All Custom Functions will be reset to their default 0 values.

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