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When the subject moves toward or away direction from the camera
Autofocus can follow a subject moving at 4m/s farther than 10m at telephoto and 3.5m from the camera. A subject moving slower toward the camera can be kept in focus even more closer.
When the subject moves to the left or right direction
Autofocus can follow a subject moving at 1.5m/s farther than 10m at telephoto and 3m from the camera. A subject moving slower toward the camera can be kept in focus even more closer.