Nikon D3000 ユーザーズマニュアル

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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
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.
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.