automatic focus – Liberal Dictionary

automatic focus noun
a system in a camera which automatically adjusts the lens so that the object being photographed is in focus, often one using infrared light to estimate the distance of the object from the camera
(as modifier)automatic-focus lens
Abbreviation: AF Also called: autofocus Liberaldictionary.com
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Collins English Dictionary – Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Autofocus is kind of like a microwave oven. Just a few short decades ago, it didn’t exist. And now we have no idea how we could live without it.

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VILTROX EF M2 Automatic focus