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3 Adjust settings.
The maximum value for auto
ISO sensitivity can be selected
using Maximum sensitivity
(the minimum value for auto
ISO sensitivity is automatically
set to ISO 200; note that if the value selected for Maximum
sensitivity is lower than the value currently selected for ISO
sensitivity, the value selected for Maximum sensitivity will
be used). In exposure modes e and g, sensitivity will only be
adjusted if underexposure would result at the shutter speed
selected for Minimum shutter speed (
1
/4000–1 s; in modes f
and h, ISO sensitivity will be adjusted for optimal exposure at
the shutter speed selected by the user).
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 viewfinder and
rear control panel 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 and rear control panel.
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 291). 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, 0 311).
Note that ISO sensitivity may be raised automatically when auto ISO
sensitivity control is used in combination with slow sync flash modes
(available with SB-900, SB-800, SB-600, and SB-400 flash units), possibly
preventing the camera from selecting slow shutter speeds.