The ST-E10 is only compatible on certain EOS R Series cameras with a new digital hot shoe. Look into the ST-E3-RT for an RT transmitter.
-Demetrius
Current Gear: EOS 5D Mark IV, EF F/2.8 Trinity, EF 50mm F/1.8 STM, EF 85mm F/1.8 USM, 470EX-AI & 600EX II-RT
Retired Gear: EOS 40D
