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A Turning Auto ISO Sensitivity Control On or Off
You can turn auto ISO sensitivity control on or
off by pressing the S button and rotating the
sub-command dial. The rear control panel
displays an Z icon when auto ISO
sensitivity control is on and Y when it is off.
A Auto ISO Sensitivity Control
Noise (randomly-spaced bright pixels, fog, or lines) is more likely at
higher sensitivities. Use the High ISO NR option in the shooting menu
to reduce noise (see page 302). When a flash is used, the value selected
for Minimum shutter speed is ignored in favor of the option selected
for Custom Setting e1 (Flash sync speed, 0 323). Note that ISO
sensitivity may be raised automatically when auto ISO sensitivity
control is used in combination with slow sync flash modes (available
with optional flash units; 0 192), possibly preventing the camera from
selecting slow shutter speeds.