[Bails Galvs]

It is not the microphone, but indeed the camera. The AGC or automatic gain control is the problem. I’m no expert but I’ll explain it the best i can. The AGC is used in the 5D and 60D to turn the sound down when their is a loud voice. Otherwise you have that constant hissing sound in the background. Fortunately unlike the 7D, the 5D and 60D have the option to turn this off giving you semi-clear audio. But when you plug in a shotgun or external mic, this option goes away. I’m sorry to say, that pretty much your only and easier option is to buy a external sound recorder like a Zoom H4N. It is not that hard in post to line them up. That’s what a clapper-board is for. So the loud sound it makes during production show up in your editor and can line them up fairly easily. Easiest option, Zoom H4N, it around $300. It’s worth it.