Nikon D90 user manual A1 AF-area Mode, 173

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	Description
	User selects focus point using multi selector; camera focuses on subject in

KSingle 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
Dynamic	camera will focus based on information from surrounding focus points if
	subject briefly leaves selected point. Use with erratically moving
I 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
H Auto-area	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.
	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
3D-tracking	shutter-release button is pressed halfway. Use to recompose
f (11 points)	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.

The current setting is shown in the shooting information display (pg. 10).

A3D-tracking (11 Points)

L

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.

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