B&H Photo has put together this convenient kit to provide you with the items you need to wirelessly illuminate your subjects with a great amount of flash output.
Our kit includes (2) Canon 580EX II Speedlite E-TTL-II Flash Units which each boast a Guide Number of 190' (58 m) at 105mm, and (1) Canon ST-E2 Transmitter Kit. The transmitter can control up to two Speedlite 580EX slave groups in one of four channels (for a total of eight flashes). The flash ratio between the two groups can also be controlled.