Canon EOS 6D Mark II, Instruction Manual

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3
Custom Function Settings
N
C.Fn II-2 Acceleration/deceleration tracking
This sets the tracking sensitivity for moving
subjects whose speed can momentarily
change dramatically by starting or stopping
suddenly, etc.
0
Suited for subjects that move at a steady speed (minor changes 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. S2 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.