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

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Choosing a Metering Mode

You might want to select a particular metering mode for your first shots, although the default Evaluative Metering (which is set automatically when you choose a Basic Zone mode) is probably the best choice as you get to know your camera. To change metering modes, press the Metering Mode/WB button and spin the Main Dial to cycle among the choices shown in Figure 1.10:

  • Evaluative metering. The standard metering mode; the 40D attempts to intelligently classify your image and choose the best exposure based on readings from 35 different zones in the frame, with emphasis on the autofocus points.

  • Partial metering. Exposure is based on a central spot, roughly nine percent of the image area.

  • Spot metering. Exposure is calculated ...

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