Nikon 6MB07411-03 User Manual (en)

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U
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).
51 points 
(3D-tracking)
If the subject leaves the selected focus point, the 
camera will use 3D-tracking to track the subject and 
select a new focus point 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 the 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.
A
See Also
For information on using the Fn button and command dials to select the 
number of focus points for dynamic-area AF, see Custom Setting f4 
(Assign Fn button) > Fn button + command dials Dynamic AF area 
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Option
Description