Canon EOS 5D Mark IV L-series Zoom Lens Kit オーナーマニュアル

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 Customizing AF FunctionsN
With AI Servo AF for continuous shooting, you can preset the AF 
operation characteristics and shutter-release timing for the subsequent 
shots after the first shot in continuous shooting.
0: Equal priority
Equal priority is given to focusing and 
continuous shooting speed. In low 
light or with low-contrast subjects, 
continuous shooting speed may slow 
down.
-2/-1: Shooting speed priority 
Priority is given to the continuous shooting speed instead of achieving 
focus. With -2, decrease of continuous shooting speed can be better 
prevented than with -1.
+2/+1: Focus priority 
Priority is given to achieving focus instead of the continuous shooting 
speed. The picture will not be taken until focus is achieved. Although 
focus can be achieved easier in low-light conditions with +2 than with 
+1, continuous shooting speed may decrease.
AI Servo 2nd image priority
AF2
Under shooting conditions that activate flicker reduction (p.215), even if 
[Shooting speed priority]: [-1] or [-2] is set, the continuous shooting speed 
may become slower or the shooting interval may become irregular.
If focus cannot be achieved in low-light conditions when [0: Equal priority
is set, setting [Focus priority]: [+1] or [+2] may give better results.