automatic focus

noun

1. Also called: autofocus.  AF. 

   1. 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

   2. ( as modifier )

      automatic-focus lens

Example Sentences

He bought this new toy, reasoning that automatic focus would save time taking pictures in space.

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There were no automatic focus cameras yet.

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The camera, he wrote, has no light meter and no automatic focus, shutter, ISO or aperture settings, meaning it’s all on him.

Read more on New York Times