Manual override control (exposure correction)
Exposure meters are calibrated to a standard
grey value for an average photographic
subject. If the subject does not conform to
this standard, manual override correction of
the exposure-meter reading may be
necessary.
Manual override is more often necessary in
the full-field integral mode. In selective
mode, the more limited metering field
makes it possible to measure a representa-
tive detail with an average grey value, thus
ensuring accurate measurement.
Generally, you correct the indicated
exposure only after you have balanced the
shutter-speed and aperture, by correcting
either for shutter-speed or aperture. By
employing the override, the exposure mete-
ring value adapts to take account of the
respective correction.
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