The Canon Speedlite Transmitter ST-E2 is compatible with Type A EOS cameras (E-TTL auto flash) & Type B EOS cameras (manual flash) The ST-E2 is designed to control slaved Canon 550 EX flashes enabling simultaneous flash use in professional settings The wireless controller has a flash ratio control allowing for several different AB ratios 18 to 81 in half-step increments as well as slave confirmation via a test transmission button which sets off slave A followed by slave B at 164 output Allows the wireless control of slave (remote) Speedlite flashes (except the Speedlite 220EX) Can be used as on-camera master unit Permits E-TTL flash with ratio control of two groups of slave units controllable over a six-stop range
Dimensions (Wx Dx H) 62 cm x 8 cm x 51 cm Weight 100 g