Nikon Digital Camera user manual Predictive Focus Tracking, Continuous-servo Autofocus

APredictive Focus Tracking

In AF-Cmode or when continuous-servo autofocus is selected in AF-Amode, the camera will initiate predictive focus tracking if the subject moves toward the camera while the shutter- release button is pressed halfway. This allows the camera to track focus while attempting to predict where the subject will be when the shutter is released.

DContinuous-servo Autofocus

In AF-Cmode or when continuous-servo autofocus is selected in AF-Amode, the camera gives higher priority to focus response (has a wider focus range) than in AF-Smode, and the shutter may be released before the in-focus indicator is displayed.

AGetting Good Results with Autofocus

Autofocus does not perform well under the conditions listed below. The shutter release may be disabled if the camera is unable to focus under these conditions, or the in-focus indicator (I) may be displayed and the camera may sound a beep, allowing the shutter to be released even when the subject is not in focus. In these cases, focus manually or use focus lock to focus on another subject at the same distance and then recompose the photograph.

There is little or no contrast

between the subject and the background.

Example: Subject is the same color as the background.

The focus point contains

objects at different distances from the camera.

Example: Subject is inside a cage.

The subject is dominated by regular geometric patterns.

Example: Blinds or a row of windows in a skyscraper.

The focus point contains areas of sharply contrasting

brightness.

Example: Subject is half in the shade.

Background objects appear larger than the subject.

Example: A building is in the frame behind the subject.

The subject contains many fine details.

Example: A field of flowers or

other subjects that are small or lack variation in brightness.

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