BUG: Autofocus cameras garbage

I use webcam with autofocus and install it to spy stable object (my computer table). Result shows one bad thing: autofocus makes false-focus and Motion daemon detects it as real motion.
- this is usual behaviour in twilight;
- also happens due to daylight.

Webcam is Microsoft LifeCam with autofocus and face tracking (I don't know is tracking provided by cam or its windows driver).

Please, provide this info in your documentation / wiki.

Examples are here:
http://rghost.ru/46518711

Environment

Follow up

Fix record