YONGNUO YN600EX-RT 2.4G Wireless HSS 1/8000s Master Flash Speedlite + SN-E3-RTs Transmitter for Cannon As ST-E3-RT, YN-E3-RT + EACHSHOT Diffusers YN600EX-RT same as the Canon's best flash 600EX-RT but comes with a more favorable price,it is only one-third of the original Canon 600EX-RT. SN-E3-RTS works with Canon 600EX-RT, Yongnuo YN600EX-RT, SN600C-RT Flash Speedlite As ST-E3-RT, YN-E3-RT