Nikon Speedlight - Multiple Flash

MULTIPLE
FLASH
As many as three speedlight
units
may be connected
in series
and
fired at the same
time.
One
unit is
connected to the camera: a second
unit is connected
to the first with the Extension Cord SE-2,
an optional
accessory, linking the extension socket
on the first to
the synchro socket on the second; and
a third unit
is
connected to the second
unit with an additional
SE-2.
Note:
Extension flash
is not
possible when using the
ringlight
units.
Extension
Cord
SE-2