Auto Focus

[Red Bull]

I was sitting around today when I just started wondering how a camera auto focuses. When I ask how it focuses I mean how does the camera know that the subject is in focus? Any websites that could explain it well?http://dgrin.com/images/smilies/ne_nau.gif

[wholenewlight]

Here's one link:


http://electronics.howstuffworks.com/autofocus.htm


And another that has some stuff about camera's autofocus methods.

http://www.dcmag.co.uk/news/article/mps/UAN/404/v/2/sp/