TTL extension sync cord allows moving a flash off-camera while retaining TTL control, letting the photographer change the lighting angle. This is especially useful when using multiple light sources, for club photography, and other reportage shooting. Nikon SC-29 TTL extension cord length is approximately 1.5 m. The flash shoe includes a tripod socket and a connector for an additional TTL flash (two flashes can be connected to this cord). Nikon SC-29 also includes an AF-assist lamp that works when used with a Nikon Speedlight SB-800.