In 1997, Canon launched the industry leading Speedlite 550EX with a revolutionary optical pulse transmission wireless multiple flash system. Since then, photographers are able to use multiple speedlites to handle small scale shooting such as simple portrait or product shooting. With the advancement of technology, flash output becomes more powerful. An increasing number of professional photographers choose to replace portable studio flashes with multiple speedlites even for larger scale on location shooting, e.g. fashion or corporate photography. However, the line of sight limitation of optical pulse transmission hindered the setup of flashes and use of flash accessories.

Answering the need of professional photographers, Canon leads the industry once again with the built-in 2.4Ghz radio transmission wireless multiple flash system in the flagship Speedlite 600EX-RT. This next generation wireless multiple flash system does not have the same directional limitations of traditional optical wireless transmitters, and is free from interruption due to reception angles or physical obstacles, bring a more stable and reliable wireless flash performance. Speedlite 600EX-RT facilitates radio transmission up to 30m, among up to 5 groups^# with a total of 15 individual slave units for more flexibility in creating fabulous lighting effects with multiple wireless flash setup.

600EX-RT Radio Transmission Wireless Function Standard： IEEE802.15.4, ARIB STD-T66 Frequency： 2405 - 2475 MHz Modulation system： Primary modulation: OQPSK, secondary modulation: DS-SS Wireless settings： Master/slave Channel： Auto, Ch. 1 - 15 Wireless radio ID： 0000 - 9999 Slave unit control： Up to 5 groups# (A/B/C/D/E), up to 15 units Transmission distance (Approx.)： 30m * When there are no obstacles or obstructions between the master unit and slave unit, and no radio interference with other devices * The transmission distance may be shorter depending on the relative positions of the units, surrounding environment and weather conditions

Configuring 600EX-RT Radio Transmission Wireless function
Speedlite 600EX-RT is equipped with a dot-matrix LCD panel for easier viewing and display of more detailed information, this makes configuration of radio transmission wireless flash more user-friendly. You only have to set the same channel and radio ID on the master and slave Speedlite 600EX-RTs to establish connection.

Choosing the best channel
2.4Ghz is a commonly used radio frequency, the stability of 600EX-RT’s wireless flash control can be interfered by other radio appliances. You can choose the channel with best reception by using the “Scan” function in 600EX-RT.

^# Applicable to EOS Digital SLR cameras released from 2012 and onwards (except EOS 60Da and EOS 1200D)

---