Canon ST-E3-RT vs Yongnuo YN-E3-RT II

Canon ST-E3-RT

The Canon ST-E3-RT was released in 2012 and is Canon’s only dedicated radio transmitter which works using their 2.4GHz RT radio system. The transmitter can be used as a master to control the Canon 600EX II-RT, 600EX-RT and 430EX III-RT speedlites. The transmitter supports E-TTL II and high speed sync and has a range of up to 30m. It hasn’t been upgraded since it was released but it still works fine with all the most recent Canon speedlites and cameras so that’s not a problem.

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