I purchased a tongnuo 622c TX and the 622c. I can't get them to work in HSS. Does anyone know what cameras and flash units are compatible? I just purchased a Flashpoint rovelight 600B from Adorama for the HSS feature. I read a review of the rovelight at http://flashhavoc.com/flashpoint-rovelight-rl-600-review/ and set up the 622c tx and 622c the way they instructed and the HSS doesn't work. I also tried with my godox speedlight and it still didn't work. Need some help.