Nikon Z 6II Reference Manual page 393

D
When [On] Is Selected for [Silent Photography]
Selecting [On] for [Silent photography] disables some camera features,
including:
•
ISO sensitivities of Hi 0.3 through Hi 2.0,
•
flash photography,
•
exposure delay mode,
•
long-exposure noise reduction, and
•
flicker reduction.
C The Photo Shooting Menu: Shooting Options
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