Predictive Focus Tracking System
Autofocus is a function that automatically focuses the camera lens on a subject when the shutter release button is at the half-pressed position.
Predictive Focus
If a subject is moving toward or away from the camera at a constant rate, the camera can predict where it will be when the shutter opens. This predictive focus feature is available on some high-end digital SLR cameras.
Predictive focus tracking automatically activated according to subject status in continuous-servo AF
Focus area
Can be selected from 11 focus points
Focus lock ...
Nikon's Article on the Predictive Focus Tracking System
Detailed Explanation of Contrast Detection Method
Principle of the Split Image Focusing Aid and the Phase Comparison Autofocus Detector in Single Lens Reflex Cameras ...
The ability of the automatic focus feature of a camera to change focus as the distance between the subject and the camera changes. Some cameras use predictive focus to guess where the proper focus point will be, ...
The exposure is determined when the shutter release button is fully depressed in both single and continuous winding modes. AI Servo is supposed to be able to track subjects moving to or from the camera - a feature called predictive focus.
 See also: Focus, Subject, Camera, Speed, AF
  
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