Dedicated clip-on transmitter for E-TTL/E-TTL II wireless flash system.

Compatible Cameras: Type A EOS cameras (E- TTL, autoflash); Type B EOS cameras (Manual flash)

Sync Speed: High-Speed Sync (FP flash): Enabled with high-speed sync mode

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-E227s flash confirmation lamp lights in green for 3 sec.
AF Assist Beam: Compatible with EOS-327s 45-point Area AF and 28mm and longer lens focal lengthsEffective Range: Approx. 0.6 to 10m/2.0 to 16.5 ft along the periphery (in total darkness).

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.

Power Source: 2CR5 lithium battery x 1
Battery Life: Approx. 1,500 transmissions (At room temperature and with a new set of batteries)

SE Mode: While the power switch is set to I or HOLD, the transmission turns off automatically after about 90 sec. of non-use.

Dimensions: 62 (W) x 51 (H) x 80 (D)mm/2.4 (W) x 3.1 (D) in

Weight: 100g/3.5 oz (exluding battery)