The Pentax Hotshoe Adaptor FG Flash is designed for off-camera flash use with Pentax DSLR's, PZ and ZX cameras. It mounts to the hot shoe of the camera, and allows the camera's built-in flash to be used as a fill flash. Requires the use of either the (#37347) F5P or (#37349) F5PL Extension Cords and the (#31022) Off-Camera Shoe Adapter F (which is equipped with a 1/4""-20 threaded tripod bush). Some Pentax flashes, such as the AF-540 FGZ, do not need the Off-Camera Shoe Adapter F because they directly accept the F5P & F5PL cords.