FC-312 is a special hot shoe collection cable for Nikon camera and flashgun. Flash can be synchronized away from the camera. Support AF-assist light function to the focus, as well which set on the top of the camera, It achieves high-speed synchronous shooting for Nikon cameras and flashgun, and all the various creative flash mode function, It Contains the highest performance I-TTL BL FP features such as a maximum shutter sync up to 1/8000S.