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Digital SLR Camera Basics

Autofocus

Pressing the shutter release
button halfway and rest of the way down
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  • The illustration is an artist's conception.

Autofocus (AF) is the system that automatically adjusts camera focus.

Cameras typically have a two-stage shutter-release button: a first stage in which the shutter-release button is lightly pressed halfway, and a second in which the shutter-release button is pressed the rest of the way down. The camera focuses when the shutter-release button is pressed halfway and takes a picture when the button is pressed the rest of the way down.

Camera settings can be changed so that the camera can be focused manually by rotating the lens focus ring. This is known as manual focus (MF).


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