Advanced Photo
graph
y:
Sensitivity (ISO Equivalency)
48
Sensitivity (ISO Equivalency)
In A-REC mode, automatic gain control is used to produce
sensitivity equivalent to ISO 100 film. In M-REC mode, you can
choose increased values for sensitivity, or allow the camera to
set sensitivity in response to lighting conditions. Increasing
sensitivity reduces the time needed to make an exposure, al-
lowing increased shutter speed. This can be used to reduce
blurring caused by camera motion when lighting is poor, or to
“freeze” moving objects. Sensitivity is adjusted as shown be-
low:
Press while turning
command dial to cycle
through sensitivity
settings as follows:
100
⇔
200
⇔
400
⇔
AUTO
Sensitivity setting is
displayed in LCD
monitor, and in
control panel while
command dial is
rotated. After
command dial is
released, ISO icon in
control panel
indicates that
sensitivity adjustment
is in effect.
P 1/60
1/60 F2.7
2.7
AUT
UTO
NORMAL
NORMAL
[
10
10
]
The following settings are available:
Setting
Description
100
Approximately equivalent to ISO 100 (default)
200
400
Approximately equivalent to ISO 400
A slight amount of noise may appear in photographs taken at settings
other than
100
.
In a film camera, sensitivity is a characteristic of the film, not the camera.
Sensitivity determines the amount of light needed to produce a given de-
gree of exposure. The more sensitive the film, the less light needed to
make an exposure, allowing higher shutter speeds. Higher sensitivity is
achieved by altering the chemical composition of the film, causing a ran-
dom pattern, called “grain,” to appear in the final photograph. In a digital
camera, sensitivity has a similar effect: higher sensitivities allow higher shut-
ter speeds, at the expense of “noise” (the digital equivalent of film “grain”)
appearing in the final image.
Changes to sensitivity have no effect in A-REC mode. Turning
the mode dial to A-REC returns sensitivity to the default value;
the M-REC setting is restored when the mode dial is set to
M-REC once again.
Approximately equivalent to ISO 200
AUTO
Equivalent to
100
under normal conditions;
when lighting is poor, however, camera will
automatically raise sensitivity to compensate.
ISO icon appears in control panel and LCD
monitor only when sensitivity is raised above
100
.
