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

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For pinpoint focusing over a narrower area than 
with Single-point AF. Select one AF point <

O

> to 

focus.
Effective for pinpoint focusing or focusing on 
overlapping subjects such as an animal in a cage.
Since Single-point Spot AF covers a very small 
area, focusing may be difficult during handheld 
shooting or for a moving subject.

Select one AF point <S> to be used for focusing.

The manually-selected AF point <S> and adjacent AF points <w> 
(above, below, on the left, and on the right) are used to focus. Effective 
when it is difficult to track a moving subject with just one AF point.
With AI Servo AF, the initial manually-selected AF point <S> must 
focus-track the subject first. However, it is superior to Zone AF in 
focusing on the target subject.
With One-Shot AF, when focus is achieved with expanded AF points, 
the expanded AF points <S> will also be displayed along with the 
manually-selected AF point <S>.

AF Area Selection ModesN