Canon EOS RP Advanced User Guide - Page 531
C.Fn II-2: Acceleration/deceleration tracking, behind a subject that suddenly starts approaching
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Custom Function Settings C.Fn II-2: Acceleration/deceleration tracking Sets the Servo AF tracking sensitivity for subjects that change speed suddenly, as by suddenly moving or stopping. zz 0 Suited for subjects that move at a steady speed (minor changes in moving speed). zz -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. zz +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, 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. 531
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