Nikon D800 User Manual (en)

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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 100; 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, or Auto; in modes f and h, ISO sensitivity 
will be adjusted for optimal exposure at the shutter speed 
selected by the user).  If Auto (available only with CPU lenses; 
equivalent to 
1
/
30
s when a non-CPU lens is used) is selected, 
the camera will choose the minimum shutter speed based on 
the focal length of the lens (auto shutter-speed selection can 
be fine-tuned by highlighting Auto and pressing 
2; for 
example, faster values can be used with telephoto lenses to 
reduce blur). Shutter speeds slower than the minimum value 
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 
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.