How does Auto Focus Work?

Answer

Most camera nowadays have auto focus systems that adjusts the camera lens so that it is able to focus on the subject. Auto focus can work either passively or actively. You can find more information here: www.cambridgeincolour.com
1 Additional Answer
It uses sensors. Some use one some use many. The sensors are used to check and correct the focus. That is the simple answer for AF operations.
Q&A Related to "How does Auto Focus Work?"
Auto Focus Makes Photography Easy. Image by Flickr.com, courtesy of Omar Youssry. AF employs a series of focus points or sensors and is activated by depressing the shutter button
http://www.ehow.com/facts_5845200_auto-focus-canon...
who invented the auto focus camera.
http://wiki.answers.com/Q/Who_invented_auto_focus
$7,000,000 (estimated)
http://www.imdb.com/title/tt0298744/business
Autofocus (or AF) is an optical system that uses a sensor, a control system and a motor to focus fully automatic or on a manually selected point or area.
http://www.kgbanswers.com/what-is-auto-focus/18978...
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