Leica M Instruction Manual page 183

Notes:
• For the metering methods based on the image sensor, the shutter
must be open and it is then closed and re-cocked when the
function is cancelled. Of course, this is audible and may result in a
slight delay in the shutter release.
• When used frequently, live view mode results in increased power
consumption.
The appropriate shutter speed for correct exposure, or the variation
from a correct exposure setting, are specified or determined using
displays in the viewfinder or monitor (see following sections).
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