Reliable off-camera flash control
Control compatible Canon Speedlite flashguns over distances up to 30m. The 2.4GHz radio frequency triggering operates reliably, even when shooting outdoors and around corners – direct line of sight not required.
Create intricate multi-flash lighting set ups, triggering up to 15 Speedlite flashes with a single camera-mounted Speedlite Transmitter ST-E3-RT (Ver.3). E-TTL II flash metering makes exposure control easy.
Trigger an EOS camera* fitted with a Speedlite Transmitter ST-E3-RT (Ver.3) from a second unit or from a compatible Speedlite flashgun, such as the Speedlite 600EX II-RT. Up to 15 cameras can be triggered at once, for synchronised shooting.
The Speedlite Transmitter ST-E3-RT (Ver.3) is sealed against dust and moisture to the same degree as professional EOS cameras and L-series lenses. It features an easy to read back-lit LCD control screen and is powered by two AA/LR6 batteries.
The Speedlite Transmitter ST-E3-RT (Ver.3) supports wireless second curtain sync for the Speedlite EL-1 and Speedlite EL-5 when fired remotely, plus down to 1/8192 nuance lighting and flash exposure (FE) memory.
•    Radio frequency remote flash trigger
•    Fire selected Speedlites from 30m away
•    Part of the E-TTL II flash system
•    Controls up to 15 flashguns
•    Remote camera triggering
•    Weather sealed against dust and moisture
•    Second curtain sync, down to 1/8192 power and FE memory for EL-1and EL-5*