Canon EOS 7D Mark II Advanced Owners Manual - Page 114

3 Selecting AI Servo AF CharacteristicsN Acceleration/deceleration tracking This sets the tracking sensitivity for moving subjects whose speed can suddenly change dramatically by starting or stopping suddenly, etc. 0 Suited for subjects that move at a steady speed (minimal change in moving speed). +2 / +1 Effective for subjects having sudden movements, sudden acceleration/deceleration, or sudden stops. Even if the moving subject's speed suddenly changes dramatically, the camera continues to focus on the target subject. For example, for an approaching subject, the camera becomes less prone to focus behind it to avoid subject blur. For a subject stopping suddenly, the camera becomes less prone to focus in front of it. Setting +2 can track dramatic changes in the moving subject's speed better than with +1. However, since the camera will be sensitive even to the slight movements of the subject, the focusing may momentarily become unstable. 114