Science Podcasts

Science Scrapbook episode

Thu, 24th Nov 2011

How does autofocus work?

Download as mp4

Millions of people now own compact digital cameras and camera phones that will automatically focus on parts of a scene, without having to turn a focus wheel. But how does autofocus work? In this Naked Science Scrapbook we find out how battleship technology has found its way into cameras and why some autofocus cameras use ultrasound to figure out what to focus on...

Supported by


Rolls Royce / EPSRC Strategic Partnership



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