Leica M 240, Инструкция по эксплуатации

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EN
184
Pi
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EXPOSURE MODES
The camera provides two exposure modes: Aperture priority mode
and manual mode. Depending on the subject, situation and your
individual preferences, you can thus choose between
– the familiar “semi automatic” operation, or
– setting a fixed shutter speed and aperture.
APERTURE PRIORITY
If the shutter speed setting dial (19) is in the
A
position the
electronics within the camera generates the exposure time
automatically and continuously in the range
1
/
4000
s to 60s, in
accordance with the film speed setting, the metered brightness
and the manually selected aperture. The calculated shutter speed
is displayed in half steps to provide a better overview.
For shutter speeds slower than 2s the remaining exposure time is
counted down and displayed in seconds after the shutter release.
The actually generated and continuously controlled exposure time
can however vary from the half step value displayed: For example,
if the display shows
16
(the closest value) before releasing the
shutter, but the calculated exposure time is longer, the countdown
after releasing the shutter may actually start from
19
.
Under extreme lighting conditions, based on all the parameters the
exposure meter may generate a shutter speed that is outside the
working range, i.e. brightness values that would require shorter
exposures than
1
/
4000
s or longer than 60s. In such cases the
specified minimum or maximum shutter speed is nevertheless
used, and these values flash in the viewfinder as a warning.
Notes:
• As described in connection with the ISO setting on p. 168, a
certain amount of noise becomes apparent when using higher
sensitivities, and particularly with uniform dark surfaces. To
reduce this annoying phenomenon, after pictures with slow
shutter speeds and high ISO values the camera 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 for the real picture. As a result, the
message
Noise reduction
appears for
12s 1
in the monitor. This
doubling of the “exposure” time can be significant at longer
exposure times, and must be allowed for. During this time the
camera should not be turned off.
• If the
B
function is selected in conjunction with the auto shutter
release (see p. 190, the shutter release button does not need
to be kept pressed; the shutter will remain open until the shutter
release button is pressed a second time (this is then equivalent
to a
T
function).
1
Time data is an example