GH3 GH3 AutoFocus Help!

[Ianscreations]

Need help!
I usually shoot Manual Focus.
This weekend, I needed to film a conference that involved zooming in on the speaker as well as the crowd. It was a small room, so I used the 12-35m f2.8
I shot at 30fps at 2.8 and used ISO to set exposure. It was a decently lit room, so I was about to stay around 2500 ISO.

I had Autofocus set to AFC with face detection. Even with a static shot (no lighting change, camera movement, or subject movement), the camera would occasionally hunt for focus.

I don't know why this happened quite a few times. Is it b/c I had the "Face Detection" setting on?

Has anyone found the best AutoFocus settings to avoid "hunting" during run n gun scenarios?

Thanks!

 

[blazer003]

Yeah, I don't like face detection for filming very well (this is on my GH2 btw) because as soon as it loses detection of the face it starts hunting for something else to focus on. If I'm need to use auto focus for something like that I generally use the area auto focus and direct it to the area where the speaker is going to be (probably center area.) This seems to give the best results, but depending on the distance from the speaker to the background behind him, and how detailed that background is (more detail making it sometimes try to focus on it instead of the face) and how much they move around this doesn't always work by any means. I don't know about the focus speed of the 12-35, I think I read it's at least decent, but some lenses, like my 20, I just don't try to do auto focus because it's so slow.

 

[MR Fanny]

i only use face detect for photography only and rarely at that. I mainly use centred spot AFC where the subject is always in frame. I still wish we could be able to lock focus during recording not before.