The Canon Speedlite 580 EX II is a worthy addition to any Canon EOS DSLR kit, allowing users to harness the full powers of an artificial flash, in a relatively compact size. The 58m guide number is a strong output which will be suited for lighting up most of your shooting scenarios, while the versatile bounce head of this hotshot-mounted speedlite is capable or rotating 180 degrees left and right, as well as 90 degrees up and minus 7 degrees down. Thanks to the included AF assist beam, this flash unit will help your DSLR find focus even in dull and flat lighting conditions.