Canon ST-E3-RT

The Canon Speedlite Transmitter ST-E3-RT is a wireless enabled unit designed for professional photographers using an external flash. Canon Speedlite compatible flash devices can be controlled from a distance of up to 30m, even without direct viewing, due to a 2.4GHz radio connection. The unit can control up to 15 flash devices. It is also resistant to weathering, dust and moisture. It is equipped with an easy-to-read backlit LCD screen and powered by a pair of AA size LR6 batteries.
The unit allows you to create complex lightning sets with multiple sources and launch up to 15 Speedlight flash units with just a single Speedlite ST-E3-RT transmitter mounted on the camera. E-TTL II flash metering makes it easy to control exposure. Up to 15 cameras can be synchronised for simultaneous shooting.
Parameters and Specifications:
Flash modes:Automatic E-TTL II / E-TTL / TTL exposure controlHigh Speed ??Sync (FP)Manual output setting: 1/1 to 1/128Manual steps 1/3 EVStroboscopic / output setting: 1/4 to 1/128Frequency: 500Hz
Flash Features:
Flash exposure lock
Exposure compensation with flash
Exposure braking with lightning
Modelling flash
Wireless flash:
Transmitter
Transmitter type: Radio
Approximate maximum range of the transmitter:
In buildings: 30m
Outside buildings: 30m
Number of groups: 5
Number of Channels: 15
Remote shutter release
Power source:
Battery 2 x AA size batteries
Construction:
Dust and water resistance
Fastening socket material: metal
Other functions:
User Functions 8 (3 personal features)
Compatible accessories SPEEDLITE 600EX-RT
Dimensions and weight:
Size (W × H × D) 67.4 × 61.5 × 77.41mm
Weight (without batteries) 110g