Nikon D800 User Manual (en)

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S
Auto ISO Sensitivity Control
If On is selected for ISO sensitivity settings Auto ISO 
sensitivity control
 in the shooting menu, ISO sensitivity will 
automatically be adjusted if optimal exposure can not be achieved 
at the value selected by the user (ISO sensitivity is adjusted 
appropriately when the flash is used).
1
Select Auto ISO 
sensitivity control for 
ISO sensitivity settings 
in the shooting menu.
To display the menus, press 
the 
G button. Select ISO 
sensitivity settings in the shooting menu, highlight Auto ISO 
sensitivity control
, and press 
2.
2
Select On.
Highlight On and press 
(if Off is selected, ISO 
sensitivity will remain fixed 
at the value selected by the 
user).
A
Auto ISO Sensitivity Control
Noise (randomly-spaced bright pixels, fog, or lines) is more likely at 
higher sensitivities.  Use the High ISO NR option in the shooting menu 
to reduce noise (see page 277).  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
0 299). 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 the optional flash units listed on page 381), 
possibly preventing the camera from selecting slow shutter speeds.
G button
J button