How Autofocus Works - Computerphile

Why are some cameras faster to focus than others? Dr Andy French explains the different approaches the computers inside cameras use to focus. https://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: https://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com