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123
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
/
30 s.
Shutter speeds may drop below the selected minimum if optimum
exposure cannot be achieved at the ISO sensitivity chosen for
Maximum sensitivity.
A Turning Auto ISO Sensitivity Control On or Off
You can turn auto ISO sensitivity control on or off by pressing the
S (Q) button and rotating the sub-command dial. The control panel
and viewfinder display ISO AUTO icons when auto ISO sensitivity control
is on and ISO when it is off.
A Auto ISO Sensitivity Control
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, 0 266) or slower than Custom
Setting e2 (Flash shutter speed, 0 266), 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 compatible optional flash units), possibly preventing the camera
from selecting slow shutter speeds.
A See Also
For information on choosing the reference used to set exposure when
a flash is used with auto ISO sensitivity control, see A > Custom Setting
e4 (Auto M ISO sensitivity control, 0 267).
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