Nikon D7000 - Manual (Page 114)

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AF-Area Mode
Choose how the focus point for autofocus is selected.
• Single-point AF: Select the focus point as described on page 96; the camera will focus
on the subject in the selected focus point only. Use with stationary subjects.
• Dynamic-area AF: Select the focus point as described on page 96. In AF-A and AF-C
focus modes, the camera will focus based on information from surrounding focus
points if the subject briefly leaves the selected point. The number of focus points
varies with the mode selected:
- 9-point dynamic-area AF: Choose when there is time to compose the photograph or
when photographing subjects that are moving predictably (e.g., runners or race
cars on a track).
- 21-point dynamic-area AF: Choose when photographing subjects that are moving
unpredictably (e.g., players at a football game).
- 39-point dynamic-area AF: Choose when photographing subjects that are moving
quickly and can not be easily framed in the viewfinder (e.g., birds).
• 3D-tracking: Select the focus point as described on page 96. In AF-A and AF-C focus
modes, the camera will track subjects that leave the selected focus point and select
new focus points as required. Use to quickly compose pictures with subjects that
are moving erratically from side to side (e.g., tennis players). If the subject leaves
viewfinder, remove your finger from the shutter-release button and recompose
the photograph with the subject in the selected focus point.
A
3D-tracking
When the shutter-release button is pressed halfway, the colors in the area surrounding
the focus point are stored in the camera. Consequently 3D-tracking may not produce the
desired results with subjects that are the same color as the background or that occupy a
very small area of the frame.