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About the Canon 600 EX-RT
The Speedlite 600EX-RT represents the next generation in wireless flash systems. In addition to traditional optical wireless transmission, the Speedlite 600EX-RT facilitates radio controlled, two-way wireless transmission up to 98.4 feet, among up to 5 groups with a total of 15 individual Speedlites. Communicating on 2.4 GHz frequencies, the Speedlite 600EX-RT does not have the same directional limitations of traditional wireless optical transmitters. Where other wireless signals can be interrupted by physical obstacles, radio controlled systems excel. 15 transmission channels are available, selectable manually or automatically, and radio transmission IDs can be set to prevent misfiring in the event of signal interference on the same channel.
For effective flash photography in more situations than previously possible with a Speedlite flash, the Speedlite 600EX-RT has an improved guide number of 197ft. (60m) at ISO 100. It offers 20mm to 200mm coverage, and when the extendable wide panel is pulled out, flash coverage moves as wide at 14mm. Plus, to maximize power and minimize energy consumption, the Speedlite 600EX-RT can be directed to zoom in accordance with the cameras image sensor size (full-frame, APS-H and APS-C).