Nikon D800 - Manual (Page 136)

En_03
112
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 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.