This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A feature of some cameras and other optical systems that allows a correct focus on the subject to be obtained automatically

v. To focus automatically.

n. an optical device for focussing a camera or other instrument automatically

"Camera behaving badly there's something odd going on with the autofocus, which isn't."

optical device   

AF   

season-high    2-megapixel    d'hondt    fractional-n    megapixel