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adjusted if underexposure would result at the shutter speed
selected for Minimum shutter speed (
1
/4000–1 s).
Slower
shutter speeds may be used if optimum exposure can not be
achieved at the ISO sensitivity value selected for Maximum
sensitivity. Press J to exit when settings are complete.
When On is selected, the control panel and
viewfinder show ISO-AUTO. When sensitivity
is altered from the value selected by the
user, these indicators blink and the altered
value is shown in the viewfinder.
A Auto ISO Sensitivity Control
Noise is more likely at higher sensitivities. Use the High ISO NR option
in the shooting menu to reduce noise (see page 259). 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, 0 281).
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 SB-900, SB-800, SB-600, and SB-400
flash units), possibly preventing the camera from selecting slow shutter
speeds.