Canon ST-E2 Speedlite Transmitter
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Note: A battery is included.
The Canon ST-E2 Speedlite Transmitter is a dedicated E-TTL wireless flash transmitter that can control an unlimited number of Canon flashes, in two separate groups; A and B. The ST-E2 sets and controls all functions of its slave units. The flash output ratio between groups A and B can also be adjusted from 8:1 to 1:1 or from 1:1 to 1:8.
Note: 420EX/430EX can not be used as the master slave to trigger other flashes.