Spot metering, typically available on mid-level and pro-level cameras, measures only a specific area of the image, often as little as 3 percent of the total scene, to determine exposure. On some cameras, the spot meter is fixed on the center of the viewfinder; on others, such as the Canon, you can set the meter to read from any of the auto-focus points.
Spot metering is the best choice when you have a specific area of the image that is critical for exposure. An example of this would be photographing a person against a very bright or very dark background, a situation which causes evaluative metering to over- or underexpose the main subject. If your camera doesn't include a spot-metering mode, you would choose center-weighted in such an example. |
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