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With manually selected
focusing points, when the
subject is extremely fast,
selecting the intermediate
slow option means less
chance of the focus shifting
to the background, and
m a k e s f o c u s i n g m o r e
stable.
EF400mm f/2.8L IS USM 1/400 sec. f/3.2 ISO1600
For illustration, all AF points are shown at once.
Regardless of the fast, or slow sensitivity options, AF speed from the time the AF drive
starts to the first focus is always optimized for maximum speed. This initial focus
speed (or catching speed) is a main feature of AF on the EOS-1D Mark IV. It is possible
to capture the subject quickly whenever you want to shoot.
Key point
Focusing speed for the first shot is always at
maximum speed regardless of sensitivity
