With the Speedlite Transmitter ST-E2, it is now possible to use multiple Speedlites under full E-TTL control and without the need for any interconnecting wires. This master control device for a wireless Speedlite flash system meets professional and advanced amateur standards. Its dedicated transmitter controls up to 3 Canon 550EX Speedlites as slave units 33 feet away outdoors and 49.5 feet away indoors. It is mounted as a clip-on with a shoe lock lever and locking pin.
| Manufacturer | Canon |
|---|---|
| Manufacturer SKU | 2478A002 |
| Product Weight | 3.5 ounces |
| AF Assist Beam | Compatible with EOS-3's 45-point Area AF and 28mm and longer lens focal lengths Effective Range: Approx. 0.6 to 10m/2.0 to 16.5 ft along the periphery (in total darkness). |
| Power Source | 2CR5 lithium battery x 1 Battery Life: Approx. 1,500 transmissions (At room temperature and with a new set of batteries) |
| Compatible Products | Type A EOS cameras (E- TTL, autoflash); Type B EOS cameras (Manual flash), Speedlite 420EX, Speedlite 430ex, Speedlite 430EX II, Speedlite 550EX, Speedlite 580EX, Speedlite 580EX II |
| Depth | 2.4 inches |
| Width | 3.1 inches |
| Height | 2.5 inches |
| Additional Information | Transmission System: Infrared pulse Transmission Range: Indoors: Approx. 12-15 m/39.4 - 49.2 ft; Outdoors: Approx. 8-10 m/ 26.2-32.8 ft Flash Ratio Control For A:B ratio: 1:8 to 8:1, in half- step increments or 13 steps Flash Coverage: Transmission Coverage: +/-40 degrees horizontal and +/-30 degrees vertical Slave Operation Confirmation With test transmission button. *Slave A fires followed by slave B at 1/64 output. Slave Unit SE Mode Cancellation: Cancels when the test transmission button or FE lock botton is pressed to turn on the slave unit. Flash Exposure Confirmation: 1. Before flash fires during FE lock Adequate flash exposure indicated by the flash exposure level icon lit in the viewfinder. Insufficient flash exposure indicated by the flash exposure level icon blinking in the viewfinder. 2. After flash fires ST-E2's flash confirmation lamp lights in green for 3 sec. |

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