Canon ST-E3-RT Speedlite Transmitter

The Canon ST-E3-RT Speedlite Transmitter can fire up to 15 compatible speedlite flashguns in three groups over distances of up to an impressive 30m. Radio-frequency control provides reliable operation even when direct line of sight is not possible. The ST-E3-RT can be used in almost any environment thanks to its weather proof construction. The Canon ST-E3-RT radio only Transmitter has no optical mode so cannot be used with older non-RT flashguns such as the 580 EXII and is powered by two AA batteries.... More