Canon EOS 7D mark II Manual Book page 16

AF area selection mode
AI Servo AF with all 65 points used for automatic tracking
Effective for portrait photography while moving
One-Shot AF AI Servo AF
When using [One-Shot AF], a single AF point is selected automatically from the
65 points. When using [AI Servo AF], AF starts from the manually selected AF
point and then selects the most appropriate from all 65 points.
The person is captured with the AF point
toward the left of the screen, and the AF
point then switches for shooting
In [AI Servo AF] setting, the AF point to the left
of the screen is selected. Once the person is
captured at that position, 65-point automatic AF
selection switches points, focuses, and shoots
continuously. With EOS iTR AF color and face
detection tracking, the person is accurately and
continuously focused on.
Hints and tips
With [AI Servo AF] mode, it is possible to start
shooting using a manually selected AF frame
covering the subject. This makes continue
tracking of the subject easy. For convenience
it is possible to select the same start position
for Single Point AF and 65 Point automatic
selection AF and switch between the two as
required.
When [65-point automatic selection] is set in [AI
Servo AF], AF begins from the single selected AF
point, and AF switching is carried out using all
65 AF points. This mode is convenient because
it is possible to capture subjects in a wide area
where AF points are located, however, caution
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65-point automatic selection AF
is required as tracking can become difficult
under some shooting conditions. 65-point
automatic selection is effective for when AF
point expansion and Zone AF are insufficient for
detecting subject movement (For example, small
objects moving around freely or small animals).
This feature is also effective for when you want
to quickly open up space in a composition to
shoot. The subject you are aiming for is
captured by a selected single point (such as near
the center) and shooting begins. Then, while
shooting continuously, move the camera (lens)
left or right to shoot. Doing so lets you move to
the right or left of the subject's position and
continue focusing while changing the composition.
This is an effective technique for framing utilizing
space while shooting continuously.
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Blue color of focus point is for illustration.