[Changing the Metering Mode]Normally use evaluative metering, but switch to centerweighted average or partial metering when necessary[Metering modes]
Selecting the Metering Mode
Changing the metering mode alters the exposure for the same scene
Use the metering mode which matches the scene
In the Full Auto, Program AE or any shooting mode, the correct exposure is obtained by measuring the brightness of the light entering the camera. Measuring that brightness is called metering, and the camera has multiple metering modes.
The most commonly-used metering mode is evaluative metering. The camera detects the subject's position, overall brightness, background brightness, etc., and take all of these into account to determine the correct exposure. This metering mode is good for most subjects and scenes.
Centerweighted average metering is weighted at the center.
Partial metering limits most of the metering to a small target area. Often used in backlit scenes where there are very bright and dark areas.
And spot metering, usually found on professional cameras, measures an even smaller area of the scene for pinpoint metering.
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