I have the 580EX and I was pretty sure for a long time that I could not use the built in wireless flash settings AND also shut off the pop up on the 7D. Then I read a recent post where it was said how to set it all and then hit the commander button to cancel the pop up flash. So I try this and find that if the pop up is killed that the wireless is as well. So I ask....is there anyway to use off camera flash wirelessly and not have pop-up engaged? Am I doing something wrong? Do I have to get a Speedlite transmitter? If so this is the dummest thing on this camera IMHO.