Just curious, can you set high speed sync with off camera speedlight?


I am shooting with a 7D and a 580 EXII. I was going to try high speed sync off camera using the on board IR for communication, But......This option is greyed out on the camera when the flash isn't attached, it also deosn't seem to be available on the flash either.


Both camera and flash are set to manual.


Am I missing something or is this just the way it is? both manuals are useless here.


Thanks,


Bob