LEICA M11 Monochrom Rangefinder Camera - Manual (Page 113)

PHOTOGRAPHY ▸ EXPOSURE 113
Noise Reduction is used if the following conditions apply:
ISO range Shutter speed longer than
125 – < 160 160 s
160 – < 320 80 s
320 – < 640 40 s
640 – < 1250 20 s
1250 – < 2500 10 s
2500 – < 5000 6 s
5000 – < 10 000 3 s
10 000 – < 20 000 1.5 s
20 000 – < 40 000 0.8 s
40 000 – 200 000 Always
Noise Reduction can be optionally deactivated (see p. 76).
Notes
• In each of these cases, the exposure meter remains deactivated;
after shutter release, however, the digital number display in the
viewfinder counts the elapsed exposure time in seconds.
• Leica M cameras are very compact cameras that combine optical
and electronic functions in a tiny installation space. It is therefore
impossible to shield the sensor 100% against extraneous light.
In dark environments, this will not have any negative effect – not
even on long-term exposures of several minutes. Should, however,
the camera be exposed to additional direct light during a long-
term exposure, then light incidence may result in light spots on
the sensor that will distort the image. This will occur typically in
long-term exposures in daylight via an ND filter. In such cases we
recommend protecting the camera from extraneous light. Ideally,
that would be done with a dark cloth covering the entire camera
and the lens mount.