I'm not a flash guru at all, but if you're on a real tight budget and you don't mind to set your flashes power manually...the Cactus V4 wireless flash kit works great as well. You do want to make sure that the auto power-off mode ofyour flash is disbled. The wireless cactus doesn't trigger when the flash is on standby. But perhaps this is also with the ST-E2?





Edit: I mean the C.Fn-01: Auto Power Off Activation (On/Off), should be off in that case. At least that works for me. See the manual of your flash on how to do that.