Nikon D6 Reference Manual page 269

3
Adjust settings.
•
Adjust auto ISO sensitivity control
settings.
Option
[Maximum
sensitivity]
[Maximum
sensitivity
with N ]
To prevent ISO sensitivity being raised too high,
you can select an upper limit for ISO sensitivity
control; choose from values of from ISO 200 to Hi
5. The minimum value that will be selected using
auto ISO sensitivity control is ISO 100.
Choose the maximum ISO sensitivity for flash
photography; options range from ISO 200 to Hi 5.
Selecting [Same as without flash] sets the
maximum ISO sensitivity for flash photography to
the value currently selected for [Maximum
sensitivity].
Adjusting the Camera's Sensitivity to Light (ISO Sensitivity)
Description
217