Nikon D700 Mode D'Emploi

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Auto ISO Sensitivity Control
If Off (the default setting) is chosen for the ISO sensitivity auto 
control option in the shooting menu, ISO sensitivity will remain 
fixed at the value selected by the user (see page 106).  If 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 (the 
minimum value for auto ISO sensitivity is automatically set to ISO 
200).  In exposure 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 may be used if 
optimum exposure can not be achieved at the ISO sensitivity value 
selected for Maximum sensitivity.
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.