The Vivitar Series 1 DF-372 Power Zoom AF Flash is a fully automatic system-dedicated shoe mount flash. It features full TTL support for Canon digital SLR cameras. The bounce zoom and swivel head will give you more creative opportunities with your shots. The ten-position power zoom covers numerous focal lengths. Additional features: manual output control; built-in slave function; AF focus assist beam; auto-off element; flash reflecting plate; wide angle diffuser.