Nikon SB-900 - Manual (Page 102)

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Flash modes and functions
SU-4 type wireless multiple flash shooting
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Canceling monitor pre-fl ashes
In SU-4 type wireless multiple flash, cancel the monitor pre-flashes of the
master flash unit, since monitor pre-flashes cause incorrect exposure.
When the SB-900 is set as the master flash unit, monitor pre-flashes will
not fire.
For other Speedlights, be sure to cancel the master flash unit’s monitor
pre-flashes. For how to cancel the master flash unit’s monitor pre-
flashes, refer to the user's manual of each Nikon Speedlight. •
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