Facilitating radio controlled, two-way wireless transmission up to 98.4 feet, among up to five groups or fifteen individual Speedlites, the ST-E3-RT represents the next generation in wireless flash systems. For sophisticated wireless flash setups, there's nothing like the new Speedlite Transmitter ST-E3-RT. With operational controls similar to the new Speedlite 600EX-RT, including diverse flash metering options, and a number of flash modes, the Speedlite Transmitter ST-E3-RT makes complex lighting setups simple. With a compact design and highly reliable construction, combined with a clearly laid-out information panel and buttons with back lighting and more, the Speedlite Transmitter ST-E3-RT is an indispensible tool for advanced, professional flash photography. Because it does not have an optical transmission function, the Speedlite Transmitter ST-E3-RT is not compatible with earlier Speedlite models such as 580EX II.
- Newly-designed wireless system uses 2-way radio wave communication for enhanced communication among master and slave units. Achieves a transmission distance of up to 98.4 ft./30 m, all at a 360 degree angle
- Up to 5 groups, or 15 individual flashes can be controlled via 1 transmitter
- Supports E-TTL II flash, manual flash, stroboscopic and auto external flash metering
- Dot matrix LCD panel displays all pertinent information simultaneously and backlit control panel means easy operation
- 8 types of custom functions, 3 types of personal functions
- Compatible with type A EOS cameras (E-TTL II/E-TTL autoflash)
- High-Speed Sync provided (EOS-1D X and EOS 5D Mark III only)
- Flash exposure confirmation lamp lights in green. If it does not light, shooting is not performed with the standard exposure
- The test flash button can be pressed to test if the slave units fire or cancel the auto power off status
- Improved hot shoe contacts for more reliable information transmission and operation
