Nikon Z9 Mirrorless Camera - Manual (Page 460)

460 Optical AWL
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Remote Repeating (SB-5000 Only)
The flash units fire repeatedly while the shutter is open, producing a
multiple-exposure effect.
1
C : Select [Remote repeating] for [Flash
control] > [Remote flash control].
2
C : Highlight [Remote repeating
options] in the [Flash control] display
and press
2 .