D-Tracking; A: Autofocus; A1: Af-Area Mode - Nikon D90 User Manual

a: Autofocus

a1: AF-area Mode

This option (available in all shooting modes) determines how the focus point for
autofocus is selected. Choose from the following options:
Option
User selects focus point using multi selector; camera focuses on subject in
K Single point
selected focus point only. Use with stationary subjects. Default setting
for n mode.
In AF-A and AF-C autofocus modes, user selects focus point manually, but
camera will focus based on information from surrounding focus points if
Dynamic
I
subject briefly leaves selected point. Use with erratically moving
area
subjects. In AF-S autofocus mode, user selects focus point manually; camera
focuses on subject in selected focus point only. Default for m mode.
Camera automatically detects subject and selects focus point. If type G or
D lens is used, camera can distinguish human subjects from background
H Auto-area
for improved subject detection. Default for i, j, k, l, o,
modes.
In AF-A and AF-C autofocus modes, user selects focus point using multi selector.
If user changes composition after focusing, camera uses 3D-tracking to
select new focus point and keep focus locked on original subject while
shutter-release button is pressed halfway. Use to recompose

3D-tracking

f
photographs while shooting relatively static subjects. If subject leaves
(11 points)
viewfinder, remove your finger from shutter-release button and
recompose photograph with subject in selected focus point. In AF-S
autofocus mode, user selects focus point manually; camera focuses on
subject in selected focus point only.
The current setting is shown in the shooting information display
(pg. 10).
A
3D-tracking (11 Points)
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.
Description
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