Nikon SB-500 AF Speedlight - Manual (Page 47)

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Wireless Multiple Flash-unit Photography
Using the SB-500 as a remote flash unit
Set the power switch to
[A] or [B] to correspond
with the remote flash
group selected on the
master flash unit.
• Rotate the power switch while
pressing the lock release.
• Set the remote flash channel to
3 on the master flash unit.
Confirm that the flash-
ready indicator is on,
and then shoot.