Nikon D7200 body - Manual (Page 110)

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AF-Area Mode
AF-area mode controls how the camera selects the focus-point
for autofocus. The following options are available during
viewfinder photography:
• Single-point AF: Select the focus point as described on page 89;
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 89.
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).
- 51-point dynamic-area AF: Choose when photographing subjects
that are moving quickly and can not be easily framed in the
viewfinder (e.g., birds).