Canon ST-E2 Speedlite Transmitter
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The Canon ST-E2 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.
| Transmission System | Infrared pulse |
| Transmission Range | 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] |