I'm starting to think the Rode Video Mic has something wrong with it as I've put a new battery in it and the hiss and static remained the same. I've also plugged a of computer headset, with microphone, into the 5d and the recorded audio is clean as so the 5d mic input is fine. I've tested the mic on 0db, -10 and -20 and the result is always the same; lots of hiss and static...all these tests were done with the cameras audio in manual mode.