Good evening everyone! I am brand new to this site and I just have a quick question. I have a canon 5d mkiii with a 24-70mm f2.8ii. I am new to the concept of forums so please bare with me. I just purchased the yongnuo 622c flash transceiver and I was wondering if anyone has used it and give me any feedback on it. Also, I have 2 speedlites, but only one of them supports high speed sync so if i fire both of the speedlites at one time with a shutter speed of 250 and above, would I still get the curtain stuck into the picture. THank you for the help.