Auto Focus

Auto Focus Trailer

Hows does auto-focus function in a camera work?

I know how auto-iris function works: it would just be regulating the brightness. But how does it know about focus, which seems more like a function of human eye or better still human brain, beats me. Can anyone help?

Here is a link that should help you understand auto-focus

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




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