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David Busch’s Canon® EOS M Guide to Digital Photography by Lee Sheldon

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Choosing a Metering Method

To calculate exposure automatically, you need to tell the EOS M where in the frame to measure the light (this is called the metering method) and what controls should be used (aperture, shutter speed, or both) to set the exposure. That’s called exposure mode (and includes Program (P), Shutter-priority (Tv), Aperture-priority (Av), or Manual (M) options, plus Auto and Creative Auto. I’ll explain all these next).

But first, I’m going to introduce you to the four metering methods. You can select any of the four if you’re working with P, Tv, Av, or M exposure modes; if you’re using Auto or Creative Auto, Evaluative metering is selected automatically and cannot be changed.

1. Choose metering mode: Use any of these three methods. ...

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