Nikon Z8 User Manual page 689

e4: Auto c ISO Sensitivity Control
Choose how the camera adjusts flash level when auto ISO sensitivity control is enabled.
Option
[Subject and
e
background]
[Subject only]
f
The camera takes both the main subject and background lighting
into account when adjusting ISO sensitivity.
ISO sensitivity is adjusted only to ensure that the main subject is
correctly exposed.
615
G button U A Custom Settings menu
Description
e4: Auto c ISO Sensitivity Control