I have a Canon 7D DSLR, I've recently started using the video feature quite a bit more since the birth of our son. One thing I've noticed is you can hear the lens focusing in the video. I've been told I can get a different lens with a silent motor, but I have 3 very nice L series lenses that I really like, and don't really want to spend money on another lens. I was curious if one of the external mics you can get would help with this problem and capture better quality audio at the same time. I'd like to use the video to capture some of our band performances as well and figure it might help with this. Curious if anyone else has used one. Thanks!