The $120 Yongnuo Speedlite YN600EX-RT II has Canon RT radio control and supports both Canon and Nikon's optical wireless TTL systems.
Yongnuo's newest 2.4GHz YN660 speedlight will be brighter, have longer zoom and control more wireless groups.
Yongnuo has unveiled a new E-TTL flash unit, the Speedlite YN685, with a built-in YN622C radio transceiver.
Francesco Rizzato reviews Yongnuo's YN600EX-RT Speedlite and YN-E3-RT trigger, both compatible with the Canon 2.4GHz system. Are they any good?