Power Zoom Flash for Canon E-TTL I/Ii: * The Dedicated Power Zoom Shoe-Mount flash is an auto-focus TTL power zoom lens for digital Canon SLR cameras * Its auto-zoom flash head senses the focal length of the camera 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