Canon EOS 7D Mark II Instruction Manual page 121

One-Shot AF release priority
You can set the AF operation characteristics and shutter-release timing
for One-Shot AF.
3 Customizing AF FunctionsN
: Focus priority
The picture will not be taken until
focus is achieved. Effective when you
want to achieve focus before
capturing the shot.
: Release priority
Priority is given to taking the picture
instead of achieving focus. This gives
priority to getting the shot rather than
achieving correct focus.
Note that the picture will be taken
even if focus has not been
achieved.
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