Nikon D90 D90 User's Manual - Page 193

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 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 I Dynamic area 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. 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 f 3D-tracking (11 points) 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. L 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. 173