The metering modes in DSLRs measure the amount of external light in a scene, and then apply the best exposure values according to the metering mode selected. Automatic exposure is a feature on all DSLRs, but you can select from different metering modes.
Depending on the camera manufacturer and model, there will be either three or four metering modes to select from. Click the link to read the full article containing tips for understanding and using exposure metering modes more efficiently!

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