Powerful and Efficient
- E-TTL II flash metering utilising lens distance information with pre-flash to balances flash with ambient light for more evenly lit and natural looking photos even if the subject includes highly reflective objects
- High power flash output with maximum guide number of 58 at 105mm setting (ISO 100, metres)
- Highly efficient power supply design providing up to 25% improvement in flash recycle time
- Autozoom control with selected digital SLR cameras to automatically match the flash head to the effective focal length of the camera ensuring greater accuracy and optimal output
- Colour temperature information transmission with selected digital SLR cameras ensuring optimal colour balance setting for flash output

Professional Features
- High-speed (FP) sync mode, Flash Exposure Bracketing (FEB) and Flash Exposure (FE) Lock
- Built-in transmitter and receiver offering fully wireless automatic flash with up to three groups of multiple Speedlites that can be controlled from the 580EX or optional Wireless Transmitter ST-E2
- Manual flash output between 1/1 to 1/128 in 1/3 stop increments
- Stroboscopic flash output between ¼ to 1/128 with frequency range of 1 to 199Hz
- 14 Custom Functions permitting customisation of operation to personal preferences

Advanced Design
- Autozoom head covering a range of 24-105mm or as wide as 14mm with built-in wide panel engaged
- Built-in AF-assist beam compatible with EOS multi-point AF systems including 45-point Area AF types
- Fully swivelling head with stops at 60, 75, 90, 120, 150 and 180 degrees
- Flexible bounce head with stops at 7 (down), 45, 60, 75 and 90 degrees
- Built-in catchlight reflector allowing a catchlight to be added quickly and conveniently to portraits

Features:

E-TTL II evaluative flash metering for critically accurate exposure

High output with maximum guide number 58 at 105mm setting (ISO 100 metres)

Autozoom and colour temperature information for improved flash with selected digital SLR cameras

Fully featured wireless flash capability with built-in slave and transmitter using multiple Speedlites