Nikon D800 User Manual (en)

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ISO Sensitivity
“ISO sensitivity” is the digital equivalent of film speed.  Choose 
from settings that range from ISO 100 to ISO 6400 in steps 
equivalent to 
1
/
3
 EV.  Settings of from about 0.3 to 1 EV below ISO 
100 and 0.3 to 2 EV above ISO 6400 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 panel or 
viewfinder.
Manual Adjustment
Main command 
dial
S button
Control panel
Viewfinder