Nikon D3000 - Manual (Page 41)

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AF-Area Mode
Choose how the focus point for autofocus is selected.
1
Place the cursor in the information display.
If shooting information is not displayed in the monitor, press the R button.
Press the P button to place the cursor in the information display.
2
Display AF-area mode options.
Highlight the current AF-area mode in the
information display and press
J.
3
Choose an AF-area mode.
Highlight one of the following options and press
J. f 3D-tracking (11 points) is not available
when AF-S is selected for focus mode.
R button Information display P button
Option Description
c Single point
User selects focus point using multi selector; camera focuses on
subject in selected focus point only. Use with stationary subjects.
d
Dynamic
area
In AF-A and AF-C focus modes , user selects focus point using multi
selector, but camera will focus based on information from
surrounding focus points if subject briefly leaves selected point. Use
with erratically moving subjects. In AF-S focus mode, camera focuses
only on subject in focus point selected by user.
e Auto-area Camera automatically detects subject and selects focus point.
f
3D-tracking
(11 points)
In AF-A and AF-C focus modes , user selects focus point using multi
selector. If subject moves after camera has focused, camera uses 3D-
tracking to select new focus point and keep focus locked on original
subject while shutter-release button is pressed halfway. If subject
leaves viewfinder, remove your finger from shutter-release button
and recompose photograph with subject in selected focus point.
Note that 3D-tracking may not produce the desired results with
subjects that are the same color as the background.