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Adjust ISO sensitivity
(_ 74).
II 150Sensitivity Auto Control
If Off is chosen for ISO sensitivity
auto control in P,S,A, and M
modes, ISO sensitivity
will remain fixed at the value selected by
the user (_ 74). When On is chosen, ISO sensitivity will
automatically
be adjusted
if optimal
exposure can not be
achieved at the value selected by the user (flash level is adjusted
appropriately).
The maximum
value for auto ISO sensitivity can
be selected using the Maximum
sensitivity
option in the ISO sensitivity
auto
control menu (choose lower values to prevent noise; the minimum
value for auto ISO
sensitivity
isautomatically
set to ISO 200).
In modes P and A, sensitivity will only be
adjusted
if underexposure would result at the shutter speed selected for Minimum
shutter speed.
Slower shutter speeds will be used only if optimum exposure can
not be achieved at the ISO sensitivity
value selected for Maximum
sensitivity.
If the
ISO sensitivity
selected by the user is higher than the value selected for Maximum
sensitivity,
the value selected for Maximum
sensitivity
will be used instead.
When On is selected, the viewfinder
shows ISO-AUTO and the
information
display ISO-A. These indictors blink when sensitivity
is altered from the value selected by the user.
[]
Auto ISO Sensitivity
Control
Noise is more likely at higher
sensitivities.
Use the High ISO NR option in the shooting
menu to reduce noise (_ 151).
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.
149
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