Canon EOC-1DX, Инструкция по эксплуатации

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Although this is the same as Single-point AF, the
selected AF point <
O
> covers a smaller area to
focus. Effective for pinpoint focusing of
overlapping subjects such as an animal in a cage.
Since Spot AF covers a very small area, focusing
may be difficult during hand-held 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 manually-selected AF point <
S
> must focus-
track the subject first. However, it is easier to focus the target subject
than with Zone AF.
With One-Shot AF, when focus is achieved with an expanded AF point,
the expanded AF point <
S
> will also be displayed along with the
manually-selected AF point <
S
>.
AF Area Selection Modes
Single-point Spot AF (Manual selection)
Single-point AF (Manual selection)
AF point expansion (Manual selection )
COP
Y