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Nikon SU-4 Wireless Slave Flash Controller:The SU-4 enables wireless remote slave flash and can be attached to any current Nikon Speedlight. The SU-4 detects the firing of the master flash (including built-in speedlights) and sends a firing start signal to the slaved unit. The SU-4 stops the firing of the slaved flash by detecting the firing stop of the master flash. Use of SU-4's eliminates connecting cords. Operates up to approximately 23 feet from the location of the main flash. NOTE: This unit is not compatible with digital SLR cameras. |