The ST-E3-RT is Canon's radio trigger offering and is designed to complement speedlites with integrated radio receivers, such as the 600EX and 600EX II. Automatic exposure via E-TTL II and high speed sync are two compelling features made possible by this transmitter.
Connect your flashes and cameras to the PocketWizard FlexTT5 to trigger them remotely with another PocketWizard transmitter. The FlexTT5 supports Canon's E-TTL II metering when you connect compatible flashes.
Slide this into your camera hot shoe and trigger any PocketWizard receiver with remote E-TTL II metering when using compatible Canon flashes (e.g. 580EX II).
Free yourself from line of sight triggering. Put your strobes and cameras around corners, behind trees etc and trigger them from up to 500 metres away, or even further!