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Nikon s three AF Area Modes—Single Point AF, Dynamic Area AF and Auto Area AF—are designed to handle any shooting situation. With good light control and a static subject, Single Point AF ensures that the most important element in the composition, such as the eyes in a portrait, will be sharply focused. With Dynamic Area AF, you can select from several focusing options: 9-, 21- or all 51-point AF. Select a Single AF point and the areas surrounding it serve as backup—a significant advantage when shooting moving subjects. Select the 9-point option when you want to focus on erratically moving subjects with greater accuracy. When dealing with insufficient contrast for fast focus detection, choosing 21 or 51 points makes detection easier. The 51-point option also allows for 3D Focus Tracking, which uses color information from the RGB metering sensor to automatically follow moving subjects across the AF points. Auto Area AF uses color information and special face recognition algorithms to automatically focus on an individual s face, which is extremely helpful when there s simply no time to select a focus point, or when using Live View in hand-held mode at high or low angles.

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Auto Focus. All digicams and most modern SLR lenses have this function now. The lens automatically focuses on the subject as quick as the eye. The only difference is that with an SLR you can normally select manual focus if necessary.
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Short for Automatic Focus, the camera and lens work together to select the correct focus.
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Abbreviation for Autofocus
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