As a Canon top-of-the-line flash, the Speedlite 600EX-RT takes the best features from existing models and adds functionality for enhanced digital photography. The 600EX features a new wireless multiple flash system using radio wave communication that provides more precise control over as many as five groups of flashes. There's also more power, with a guide number of 197' (60 m) at ISO 100, a zoom flash head that covers a 20-200mm range.  Compatible with the AF frame of all EOS cameras, the Speedlite 600EX-RT even works perfectly with the 61-Point High Density Reticular AF found in the EOS-1D X and the EOS 5D Mark III.

As the Canon top-of-the-line flash for the EOS-system, the Speedlite 580EX II takes the best features from existing models and adds functionality that enhances digital photography. A more powerful flash with a maximum guide number of 191'(58 m) at ISO 100 (at 105mm focal length), faster recycling, more consistent color and enhanced controls are among the improvements that all photographers, especially those who shoot digital, will find useful.