Type: Direct- sync, shoe-mount flash with E-TTL/TTL autoflash control and wireless transmission/reception (E-TTL preflash, AF-assist beam, auto zoom, and bounce flash

Compatible Cameras: Type-A EOS cameras (for E-TTL autoflash control). Type-B EOS cameras (for TTL autoflash control).

Flash Coverage: Auto zoom head covers 24mm, 28mm, 35mm, 50mm, 70mm, 80mm, and 105mm lens focal lengths automatically. Manual zoom: Enabled with zoom button. Wide panel: When the built-in wide panel covers the flash head, flash coverage is extended for 17mm lens local length.

Flash Modes: Normal flash; Quick flash; High-speed sync (FP flash); Stroboscopic flash: 41 flash frequency settings, 31 firing settings; Preflash: Obtains exposure reading for E-TTL autoflash control; Test flash: With test firing button; Modeling flash: Fired with the EOS-3's depth-of-field preview button