Best AF practice for video

I'm using a EOS 7D for shooting 1080p HD video. New to the camera and DSLR for video. I've looked at several tutorials but still don't have a good understanding of what the best practices are for focusing.
If I put the camera in AI Servo will it auto focus if the subject moves away or toward me with out me depressing the back AF-ON or shutter button? Or must I press one of those buttons to make the camera continue focus?
Do you know of any tutorials or video teachings that go through using focus with video?
Thanks in advance!
Solved!
Go to Solution.

The 7D is not going to perform continuous auto-focus in video. AI Servo mode is for still photography. The 70D _will_ perform continuous auto-focus during video and does an outstanding job of it (due to it's ability to do phase-detect AF directly on the camera sensor.)
Every camera *other* than the 70D (including all other brands -- the 70D is unique right now) have to do "contrast detect" auto-focus. Contrast detect has to analyze contrast differences between adjacent pixels, make an adjustment and then evaluate if the contrast increased or decreated. That tells the camera if it's even focusing in the right direction... then it has to re-focus, re-evaluate, re-focus, re-evaluate... until it finally optimizes contast and that means the image is finally focused. This results in a game of "focus hunt". It's slower and anyone watcing the video will see the camera hunt for focus.
The better way is to manually focus the camera. If you were making a more serious video you'd even pre-plan the focus changes -- and wrap a piece of tape around the focus ring and use a marker to place the focus points on the ring (you pre-focus the camera to each position you plan to use during that clip). Having done this you can smoothly move focus from subject to subject just by looking at the marks you made on your focus ring. This isn't going to help you in ad-hoc video clips -- it's what you'd do if you were thinking about film-making.
The 7D will re-focus if you press the AF-ON button... but it will focus hunt when it does this.
Tim Campbell
5D II, 5D III, 60Da

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