Caution ! Dynamic AF versus single point AF... !

With the AF-area mode to specify that for Auto Focus operation, the focus areas are activated. The mode is a switch on the camera is set to match each shooting situation. There are not all the modes with cameras available, please refer to further information in the technical data of the respective camera.
Voters for AF-area mode
Icon on the camera screen for
Dynamic AF with 3D tracking
First Single-point AF
In this mode, the photographer one of the one of the (up to 51, depending on the camera) determine the available focus points, on which the camera focuses then. The selected frame turns to the camera's viewfinder. The camera then focuses on the subject in the selected focus area.
This mode should be selected when the main subject is not moving or remaining within the selected focus area. When Spot metering is selected, the exposure is associated with the activated focus area.
Second Dynamic AF
This mode allows the photographer to determine one of the available focus areas on which the camera focuses then first. Once the camera detects that the subject has moved out of this focus area, they track the subject through other focus areas beyond. The display of the selected focus point in the viewfinder does not change. In this mode, some cameras offer a number of focus areas to be used (up to 51) to choose from.
Dynamic AF with 3D tracking
When Dynamic Area AF with 3D tracking is enabled, the camera tracks the subject selected by using information from other focus areas as well as the color of the subject. The camera uses this Nikon 1005-pixel RGB sensor to determine the color of the subject, and then uses this information to permanent research and select the right focus point. Even if the subject moves from one side to the other, or it is obscured by other objects in the short term, causes the camera to focus on the selected subject. In this mode, the display of the active focus area in the viewfinder changes to see what the camera focuses.
All types of dynamic-area AF mode is useful to track subjects that move in unpredictable ways and hard to keep in one focus area are. They are particularly valuable for sports or nature photography, where to move the main motives frequently from one side to the other or be temporarily obscured by other objects.
When the focus mode is set to AF-S (single-servo AF), you can only select the Single Area AF with AF area mode.
Third In Automatic AF-area mode
the camera selects the focus points automatically. The camera selects the main subject item from the closest object to the determination of the focus point. The focus area can not be selected manually and is not displayed in the viewfinder.
This mode of operation is particularly useful when it comes to a quick selection of the subject and the focus area can not be determined manually. Particularly helpful in this area AF is the sports and news photography, in which the detection of the main subject must be done quickly and the focus area can not be selected manually.
Shooting with Single AF (AF-S), the active focus points are highlighted for about a second after the camera is focused. In continuous AF active focus points are not displayed.