Nikon Speedlight SB-700 - Manual (Page 67)

D–5
Wireless Multiple Flash-unit Photography
D
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Notes on canceling the fl ash of the master fl ash unit
When the master fl ash unit fl ash function is canceled and only the
remote fl ash units fi re, the master fl ash unit emits a number of weak
light signals to trigger the remote fl ash units. This operation will
normally not affect the correct exposure of the subject, although
the exposure might be affected if the subject is close and a high ISO
sensitivity has been set. To limit this effect, bounce the light by tilting
up the master fl ash unit’s fl ash head.