Using two housed Nikon SB800 Speedlights in master/remote iTTL mode
In brief, it is not possible to directly electrically
wire two Nikon SB800s for iTTL use. Through testing it became evident that the water medium hampered the light signal required for
wireless communication between two housed SB800 speedlights. I used two SB800s in Fantasea
clear polycarbonate housings with homemade optical cabling mounts. One SB800 is set
as master and the other as remote; both in iTTL mode.
In clear polycarbonate housings I had hoped that the two
SB800s would be able to communicate wirelessly. While this worked fine topside,
underwater testing was not successful as there
was insufficient signal to fire the remote. To solve this I routed a .75mm
single strand fiber optic cable from beneath the strobe lens on the outside of
the master's housing.
The scorpion fish pair image shows shadows cast from two directions demonstrating both strobes active. While use of vendor supplied optical cable and mounts was not successful, my homemade mounts did function quite nicely.
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