Nikon Z9 Mirrorless Camera - Manual (Page 457)

457 Optical AWL
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Quick Wireless Control (SB-5000 Only)
Select this item to control the relative balance between the remote flash
units in groups A and B and adjust flash output for group C. Output for
group C is adjusted manually.
1
C : Select [Quick wireless control] for
[Flash control] > [Remote flash control].
2
C : Highlight [Quick wireless control
options] in the [Flash control] display
and press
2 .