Fire compatible Speedlites over distances of up to 30m with this Speedlite transmitter ST-E3-RT. Normally used in the hotshoe of your EOS camera, this radio wireless Transmitter can control up to 15 Speedlites as a master unit, allowing you to create intricate multi-flash set ups and synchronised shooting.
Radio-frequency control provides reliable operation even when shooting outdoors and around corners - direct line of sight is not required. Like other Canon professional products, the Transmitter is weather sealed against dust and moisture.
Compatibility: EOS cameras using E-TTL and E-TTL II autoflash systems. Not compatible with EX Speedlites earlier than the 600EX-RT.