Nikon D850 - ISO Sensitivity; Manual Adjustment

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ISO Sensitivity
The camera’s sensitivity to light can be adjusted according to the
amount of light available. Choose from settings that range from
ISO 64 and ISO 25600 in steps equivalent to
1
/ 3 EV. Settings of
from about 0.3 to 1 EV below ISO 64 and 0.3 to 2 EV above ISO
25600 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 (Q) button
and rotating the main command dial until the desired setting is
displayed in the control panel and viewfinder.
Manual Adjustment
A The ISO Sensitivity Menu
ISO sensitivity can also be adjusted using the
ISO sensitivity settings option in the photo
shooting menu (0 252).
S (Q) button
Main command dial
Control panel
Viewfinder