The Dedicated Power Zoom Shoe-Mount flash is an autofocus TTL power zoom lens for digital Canon SLR cameras. Its auto-zoom flash head senses the focal length of the camera's lens and adjusts accordingly. There is a built-in slave mode and it can tilt (0 - 90 degree) and swivel (0 - 270 degree) for complete lighting control and shadow-free flash photography. Additional features include red-eye reduction, automatic shutter speed setting, front and rear curtain synchronization, and a 24mm-85mm zoom range.