Nikon D90 - Manual (Page 193)

173
L
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:
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.
Option Description
K Single point
User selects focus point using multi selector; camera focuses on subject in
selected focus point only. Use with stationary subjects. Default setting
for
n mode.
I
Dynamic
area
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
subject briefly leaves selected point. Use with erratically moving
subjects. In AF-S autofocus mode, user selects focus point manually; camera
focuses on subject in selected focus point only. Default for
m mode.
H Auto-area
Camera automatically detects subject and selects focus point. If type G or
D lens is used, camera can distinguish human subjects from background
for improved subject detection. Default for
i, j, k, l, o, P , S , A , and M
modes.
f
3D-tracking
(11 points)
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
photographs while shooting relatively static subjects. If subject leaves
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.