Exposure Lock - Leica M Instruction Manual

EXpOSURE LOCK

For compositional reasons, the most important part of the subject is
often not in the center of the picture, and as a result such important
parts of the subject may be excessively light or dark. However, the
center-weighted metering and spot metering on the Leica M record
predominantly or exclusively an area in the center of the image are
calibrated to an average gray scale value.
Subjects and situations of this type can be overcome very easily even
in aperture priority mode, using exposure lock.
Note:
Exposure lock should not be used in conjunction with multi-field
metering, as in such cases selective recording of a single subject
detail is not possible.
Using the function
1. Aim at the important subject detail (with the metering field for
spot metering) or alternatively at another detail with average
brightness.
2. Press the shutter release button (1.19) to the 1st pressure point
to measure and store the value. As long as the pressure point is
held, a small red dot appears in the viewfinder at the top in the
digits line for confirmation, and the exposure time no longer
changes even if the lighting conditions are different. A dot
appears between the ISO and exposure compensation values in
the monitor.
3. Keeping the shutter release pressed, move the camera to capture
the final trimming,
4. The shutter can then be released using the exposure originally
determined.
Changing the aperture setting after using exposure lock has no effect
on the shutter speed, and will lead to an incorrect exposure. Exposure
lock is cancelled when you remove your finger from the shutter
release pressure point.
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