Spot metering is the measurement of very small portions of the total image area. Older cameras, as well as less-expensive digital cameras, only offer a single, centrally located measuring point, usually between 1 to 5 degrees in coverage. Many newer cameras offer a selection of 3, 5, 7, 11 or more reference points for selective metering, which enable you to selectively measure important areas of the photograph, including areas that are off-center to the frame. Spot metering is a very effective way to take readings of backlit subjects.
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