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 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]|