Nikon d3s User Manual (en)

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113
S
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.