I need help…I was using my EX580II flash on my 5dmk2 for one of the night event which was close to pitch dark. I do not have enough light source to allow AF to detect and snap the photos. I was told by a fellow Nikon guy there that I could sync to AF on my flash which I could not figure out how. His Nikon cam was able to detect. Can someone enlighten me on the steps to do so? Many thanks.