Nikon D5500 Reference Manual page 103

1
Display focus mode options.
Press the P button, then highlight the
current focus mode in the information
display and press J.
2
Choose a focus mode.
Highlight a focus mode and press J.
A
Predictive Focus Tracking
In AF-C mode or when continuous-servo autofocus is selected in AF-A
mode, the camera will initiate predictive focus tracking if the subject
moves toward the camera while the shutter-release button is pressed
halfway. This allows the camera to track focus while attempting to
predict where the subject will be when the shutter is released.
D
Continuous-Servo Autofocus
When Focus is selected for Custom Setting a1 (AF-C priority
selection; 0 248) and the camera is in AF-C mode or continuous-servo
autofocus is selected in AF-A mode, the camera gives higher priority to
focus response (has a wider focus range) than in AF-S mode, and the
shutter may be released before the in-focus indicator (I) is displayed.
P button
Information display
More on Photography
79