Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 367
Accel./decel. tracking
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Accel./decel. tracking Setting for AI Servo AF/Servo AF subject-tracking sensitivity in response to sudden, significant changes in speed, as when subjects suddenly start or stop moving. 0 Suited for subjects that move at a steady speed (minor changes in moving speed). -2 / -1 Suited for subjects that move at a steady speed (minor changes in moving speed). Effective when a setting of 0 makes focus unstable, due to slight subject movement or an obstruction in front of the subject. +2 / +1 Effective for subjects having sudden movements, sudden acceleration/deceleration, or sudden stops. Even if the moving subject's speed suddenly changes significantly, the camera continues to focus on the target subject. For example, the camera is less likely to focus behind a subject that suddenly starts approaching you, or in front of an approaching subject that suddenly stops moving. Setting +2 can track dramatic changes in the moving subject's speed better than with +1. However, since the camera will be sensitive to even slight movements of the subject, focusing may become unstable for short periods. 367