Nikon D750 DSLR Camera (Body Only) - Manual (Page 151)

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AF-Area Mode
Choose how the focus point is selected during viewfinder
photography.
• Single-point AF : Select the focus point as described on page 127;
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
127. 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).