The Canon ST-E2 Speedlite Transmitter is a dedicated E-TTL (II) wireless autoflash transmitter that can control an unlimited number of flashes with Canon Speedlites 420EX, 430EX, 430EXII, 550EX, 580EX and 580EX and 5D Mark III 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.
Under low-light or low-contrast conditions it emits an AF-assist beam linked to the camera's focusing points.
Note: 420EX/430EX cannot be used as the master slave to trigger other flashes.
|Transmission System||Infrared pulse|
Indoors: Approx. 39.4 - 49.2' (12-15 m)
Outdoors: Approx. 26.2-32.8' (8-10 m)
|Transmission Coverage||±40° horizontal and ±30°vertical|
|Power Source||2CR5 lithium (6V) battery|
|Dimensions||2.4 x 2.0 x 3.1" (62 x 51 x 80mm) WxHxD|
|Weight||3.5 oz (100 g) [excluding battery]|