Canon Speedlight 580EX f PowerShot

580EX - Speedlite for powershot a high & flash unit for the digital age with enhanced basic features Combining the strengths of its predecessor 550EX while providing additional functions at higher speeds, the SPEEDLITE 580EX is Canon's new flagship flash unit featuring a higher maximum guide number, shorter recycle time, autozoom control for image sensor size, and design improvements for easier handling by digital SLR users ranging from professional to advanced amateur.