Canon EF Central Emphasis Metering

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Central Emphasis Metering

After extensive experimentation, it was determined that the Central Emphasis Metering method of exposure measurement used in the Canon EF is the most reliable way of obtaining proper exposures in fast moving AE photography. The entire viewfinder screen is read by the Silicon Photocell with more emphasis given to the center portion, where the main subject is likely to be located. In a typical landscape, even a normal center-weighted system can produce underexposure because of the influence of the bright sky in the upper part of the picture area. The following is a diagram of Canon EF's Central Emphasis Metering method which also minimizes the effect of skylight when the camera is used hori- zontally.

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