Use the metering modes to determine the right exposure

If you are not in Manual exposure mode, you are quite likely to be using one of the electronic metering modes to determine the proper exposure. Depending on what you are shooting and how you want to expose the image, one metering mode may be preferred over the other. Typical metering modes are evaluative, also called matrix or program mode, center-weighted averaging, center, or spot. Learn what modes your camera has and how to change them.

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