I purchased the flash a while ago and have not really had much use for it yet,but now I would like to do some flash with macro and I would like to get the flash off the camera and then I have to know how to make it work. I though that the Nissin Di866 would work with the 7D, as a slave or master. If I set the flash to being a remote when I go to the flash control and try and use the set external flash functions I get the message that it is an incompatible flash or is not switched on. Does this mean that the external flash settings are only for when the flash is mounted on the hot shoe or connected with a cord to the hot shoe and that it does not work if the flash is being used "off camera" in a remote or slave setting?