Hello everybody! I just got a refurbished 7D from Canon about a week ago. I've played with it a little bit and just brought it back out to play with it some more. Everything so far has seemed fine with the camera but tonight I decided I wanted to see what the depth-of-field button did in live view as the manual says "the depth-of-field preview effect can be clearly visible in live view" That's where my "issue" starts. Camera was set in AV mode and in live view because I really wanted to see this "clearly visible depth-of-field preview". So I was pushing the depth-of-field preview button, in live view, and trying to change the aperture but it wasn't changing. At all. Nothing. It also makes the shutter noise at the half depressed position like it's taking a picture, even though it's not. I can take it out of live view and it works just fine. I reset the camera back to factory settings. The battery still has a full charge on it. Turned the camera off and on. It's still happening. So is this user error or do I possibly have a defective camera?