The Canon Speedlite 600EX-RT Canon's cutting-edge new flash improves on its 580 EX II predecessor by adding radio transmission to its previously infrared-only triggering system. This allows for easy master-slave communication between other 600 EX-RTs or with the new ST-E3-RT transmitter, even when the masters and slaves are not in line-of-sight of each other. This, along with increased range, control over a larger number of flash groups, 15 radio channels, and a wider and longer zoom, makes this new flash the perfect choice for wedding photographers working alone or with assistants or for portrait and travel photographers who need to create big light from a small package. The ability to trigger from behind objects greatly increases creative light control. The 600 EX-RT is also compatible with your older Canon flashes while in optical mode.
