The 580EX II is Canon's top-of-the-range professional flash unit. It's powerful; it's big and heavy; it's rugged and weather-sealed; it recycles quickly and silently; it rotates and zooms; it has a huge number of customisable features; and somewhere in the 50+ page manual it probably explains how to get it to make a decent cup of tea. This is a serious bit of kit.

IMPORTANT NOTE - BATTERIES

The 580EX II requires 4x AA-type batteries which are NOT SUPPLIED.