Nikon D4 - ISO Sensitivity; Manual Adjustment

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ISO Sensitivity
“ISO sensitivity” is the digital equivalent of film speed. Choose
from settings that range from ISO 100 and ISO 12800 in steps
equivalent to
1
/3 EV. Settings of from about 0.3 to 1 EV below ISO
100 and 0.3 to 4 EV above ISO 12800 are also available for special
situations. The higher the ISO sensitivity, the less light needed to
make an exposure, allowing higher shutter speeds or smaller
apertures.
ISO sensitivity can be adjusted
by pressing the S button and
rotating the main command
dial until the desired setting is
displayed in the control panels
or viewfinder.
Manual Adjustment
S button Main command
dial
Top control panel Rear control panel Viewfinder