Nikon SC-4 Ready Light Adapter - Accessory
Permits use of the ready-light built into the viewfinders of Nikon F2 cameras when the flash unit is used off-camera.
This accessory slides around the F/F2 shoe and connects with the ready-light contact built into the left side of F2 prisms. It connects to the three-prong sync socket on Nikon SB-1, SB-2, SB-3, SB-5 or SB-6 Speedlites and also handles the camera-flash sync. No need for PC-sync cable.