Canon Speedlite Transmitter St-E2

Wireless controller for the E-TTL wireless autoflash system. It can control up to two Speedlite 550EX slave groups in one of four channels. The flash ratio between the two groups can also be controlled. The wireless transmitter range is about 15-20 m/49-66 ft. indoors and 8-10 m/33 ft. outdoors at a vertical angle of 139 Degrees. Under low-light or low-contrast conditions it emits an AF-assist beam linked to the EOS-3's 45 focusing points.

  
Key Features:

• Type: 550EX-dedicated, clip-on Speedlite transmitter with direct contacts.
• Compatible Cameras: Type A EOS cameras (E-TTL, aitoflash); Type B EOS cameras (manual lash).
• 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: With test transmission button. Slave A fires followed by slave B at 1/64 output.
• Wireless Transmission: Infrared pulse
• Transmission Range: Indoors: approx 40-50ft; outdoors: approx 26-33ft.
• Transmission Coverage: 140 degrees horizontal and 130 degrees verticle.
• Power Source: 2CR5 lithium (6V) battery x 1 .
• Dimensions: 62 (W) x 51 (H) x 80 (D) mm/2,4 (W) x 3,1 (D) in .
• Weight: 100 g/ 3.5 oz (exluding battery)