Nikon D300 User Manual (en)

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U
a3: Dynamic AF Area
If the subject leaves the selected focus point when dynamic-area 
AF (
I; pg. 64) is selected in continuous-servo AF (focus mode C
pg. 62), the camera will focus based on information from 
surrounding focus points. Choose the number of focus points 
from 9, 21, and 51 based on subject movement.
Only active focus point is displayed in the viewfinder. Remaining 
focus points provide information to assist focus operation.
Option
Description
c
9 points
(default)
If the subject leaves the selected focus point, the 
camera will focus based on information from the 
surrounding eight focus points. 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 points
If the subject leaves the selected focus point, the 
camera will focus based on information from the 
surrounding 20 focus points. Choose when 
photographing subjects that are moving 
unpredictably (e.g., players at a football game).
51 points
If the subject leaves the selected focus point, the 
camera will focus based on information from the 
surrounding 50 focus points. Choose when 
photographing subjects that are moving quickly 
and can not be easily framed in the viewfinder 
(e.g., birds).