Here's how the Leica M8 deals with digital artifacts introduced during low-light exposures —
When using higher [ISO] sensitivities — and in particular with dark, even surfaces — a certain amount of noise will become apparent.To reduce this annoying phenomenon, following exposures with slower shutter speeds the LEICA M8 automatically takes a second "black picture" (taken with the shutter closed). The noise present in this parallel picture is then digitally "subtracted" from the data set for the real picture.
This doubling of the "exposure" time can be significant — in particular at longer exposures — and must be considered. During this time the camera should not be switched off.For shutter speeds of 2s or more the message Noise reduction in progress... appears in the monitor.
— Leica M8 Manual
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