Often, the most effective use of your flashgun is off-camera. In other words, the flash is not sitting on the camera’s hotshoe, but is physically disconnected. How the flash synchronises with the camera differs from system to system. Sometimes, synchronisation is often achieved by using specially designed cords or leads which plug either into the camera’s PC flash connection or to the hotshoe itself. With dedicated flash systems, the manufacturer often provides the means by which the flash can be off camera and retain full dedication without having any cords or leads at all. One of these is Nikon’s famous iTTL system. Investigate for yourself the systems that are compatible with your equipment.