Nikon D5100 3Choose a focus mode

3Choose a focus mode.

Highlight a focus mode and press J. To return to shooting mode, press the shutter-release button halfway.

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 or away from 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

When Focus is selected for Custom Setting a1 (AF-C priority selection; 0 158) and the z camera is in AF-Cmode or 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 (0 45) or use focus lock (0 44) to focus on another subject at the same distance and then recompose the photograph.

There is little or no contrast	The focus point contains
between the subject and the	areas of sharply contrasting
background.	brightness.
Example: Subject is the same	Example: Subject is half in
color as the background.	the shade.
The focus point contains	Background objects appear
objects at different distances
	larger than the subject.
from the camera.
Example: Subject is inside a	Example: A building is in the
	frame behind the subject.
cage.
	The subject contains many
The subject is dominated by	fine details.
regular geometric patterns.	Example: A field of flowers or
Example: Blinds or a row of	other subjects that are
windows in a skyscraper.	small or lack variation in
	brightness.

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