YN-E3-RT Yongnuo Flash Speedlite Transmitter Compatible with 600EX-RT for Canon DSLR Cameras

It performed as advertised !

This has worked well on my Canon 5D3 to control some Canon 600ex-rt flashes at a considerable savings over the Canon equivalent. While researching Canon's new radio remote flashes, I saw a few complaints about the quality of the Yongnuo equivalent of the Canon flashes, but everyone seemed to be happy with the Yongnuo remote controller. So I got Canon flashes and this remote and haven't had any problems.

Bought this to replace Canon's ST E3 RT which does not have IR Focus Assist for some dumb reason they took it off. Anyway this Yognuo has the IR and works perfectly. if your hands hurt at the end of the day and you are tired of keeping your flash on-camera during low light the wedding receptions get this one instead. ///////6MONTH Update: Product seems to work fine but display backlight seems to have failed which is quite frustrating in the near dark of a wedding venue. I am hoping there is warranty service available.

I'm so glad I bought this system instead of the Canon.

Works perfecty on my 5D3, 6D, 70D.