Canon st e3 rt speedlite flashgun transmitter
Fire compatible speedlite flashguns over distances of up to 30m radio frequency control provides reliable operation even when direct line of sight is not possible radio frequency remote flash trigger fire selected speedlites from 30m away part of the e ttl ii flash system controls up to 15 flashguns remote camera triggering weather sealed against dust and moisture a radio frequency flash trigger aimed at professional photographers using off camera flash reliab