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

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Selecting an Autofocus/Exposure Zone Manually

If you’re using P, Av, Tv, or M shooting modes and Evaluative Metering, you can select the autofocus zone manually (and thus the zone linked to the metering system). As I mentioned in Chapter 1, the EOS 40D uses nine different focus points to calculate correct focus. In A-DEP, or any of the Basic Zone shooting modes, the focus point is selected automatically by the camera. In the other Creative Zone modes, you can allow the camera to select the focus point automatically, or you can specify which focus point should be used.

There are several methods to set the focus point manually. You can press the AF point selection button on the back of the camera (with the icon representing focus points), look ...

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