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A Minimum Shutter Speed
Auto shutter-speed selection can be fine-tuned by highlighting Auto
and pressing 2: for example, values faster than those usually selected
automatically can be used with telephoto lenses to reduce blur.
Note,
however, that Auto functions only with CPU lenses; if a non-CPU lens is
used without lens data, minimum shutter speed is fixed at
1
/
30s.
Shutter speeds may drop below the selected minimum if optimum
exposure can not be achieved at the ISO sensitivity chosen for
Maximum sensitivity.
A Enabling and Disabling Auto ISO Senstivity Control
You can turn auto ISO sensitivity control on
or off by pressing the S button and
rotating the sub-command dial.
Z is displayed when auto ISO
sensitivity control is on.
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 299).
When a flash is used, minimum shutter
speed will be set to the value selected for Minimum shutter speed
unless this value is faster than Custom Setting e1 (Flash sync speed,
0 329) or slower than Custom Setting e2 (Flash shutter speed,
0 331), in which case the value selected for Custom Setting e2 will be
used instead.
Note that ISO sensitivity may be raised automatically
when auto ISO sensitivity control is used in combination with slow
sync flash modes (available with the built-in flash and the optional
flash units listed on page 428), possibly preventing the camera from
selecting slow shutter speeds.