- Type: 550EX-dedicated, clip-on Speedlite transmitter with direct contacts;
- Compatible Cameras: Type A EOS cameras (E-TTL, autoflash); Type B EOS cameras (Manual flash);
- Channels: 4;
- Flash Ratio Control: For A: B ratio: 1: 8 to 8: 1, in half-step increments or 13 steps;
- High-Speed Sync (FP flash): Enabled with high-speed sync mode;
- Slave operation confirmation;
- Flash exposure confirmation;
- Wireless slave SE mode cancellation;
- Wireless Transmission: Infrared pulse;
- Transmission Coverage: ±40 degrees horizontal and ±30 degrees vertical;
- AF-assist Beam: Compatible with EOS-3's 45-point Area AF and 28mm and longer lens focal lengths;
- AF-assist Beam Effective Range: Approx. 0, 6 to 10 m/2.0 to 16.5 ft along the periphery (in total darkness);
- SE Feature: While the power switch is set to I or HOLD, the transmission turns off automatically after about 90 sec. of non-use
Speedlite Sändare ST-E2 monteras som ett blixtaggregat på kameran och ger ingen huvudblixt utan styr endast slavblixtarna i systemet.