This enables you to attach a TTL Speedlight unit next to a Nikon SLR. By connecting the TTL Speedlight unit and the Nikon SLR's accessory shoe with the TTL Remote Cord SC-17, can can use the Speedlight as a grip-type flash.
Wireless TTL multiple flash control is also possible by mounting a Nikon SLR with a built-in Speedlight and the Wireless Slave Flash Controller SU-4 attached to a TTL Speedlight, while using the camera's built-in Speedlight as a master unit.
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