L) central emphasis metering, D. central emphasis metering – Canon EF User Manual
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L) 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.