Iso Sensitivity; About Iso Sensitivity - Nikon Z 8 Reference Manual

ISO Sensitivity

About ISO Sensitivity

The camera's sensitivity to light (ISO sensitivity) can be adjusted according to the amount of light
available. In general, choosing higher values allows faster shutter speeds at the same aperture. Choose
from settings of from ISO 64 to 25600. Extended settings of from about 0.3 to 1 EV (ISO 32 equivalent)
below ISO 64 and 0.3 to 2 EV (ISO 102400 equivalent) above ISO 25600 are also available.
Adjusting ISO Sensitivity
Hold the S (Q) button and rotate the main command dial.
Your selection is shown in the shooting display and control
panel.
At default settings, changes to ISO sensitivity are made in
increments of ¹⁄₃ EV. The size of the increments can be changed
using Custom Setting b1 [ISO sensitivity step value].
D
High ISO Sensitivities
The higher the ISO sensitivity, the less light needed to make an exposure, allowing pictures to be
taken when lighting is poor and helping prevent blur when the subject is in motion. Note, however,
that the higher the sensitivity, the more likely the picture is to be affected by "noise" in the form of
randomly-spaced bright pixels, fog, or lines.
"Noise" can be reduced by enabling high ISO noise reduction. High ISO noise reduction can be
enabled using the [High ISO NR] items in the photo shooting and video recording menus.
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ISO Sensitivity