EOS-1D X and EOS 5D Mk III
AF Point Management
INTRODUCTION
This guide will review your control options for the 61-point
auto-focus system in the Canon EOS-1D X and 5D Mark
III. Although this is one of the fastest, most sophisticated,
and most accurate AF systems ever developed, it is not
as difcult to master as one might think. All it takes is
knowing how to apply the following three basic param-
eters to your subject and style of shooting:
1. AF Point Size
2. AF Point Location
3. AF Point Number and Type
We will review each one in the order listed.
AF POINT SIZE: SELECTING AN AF AREA MODE
Single-point AF
This is the default setting; the one the camera is set to
when you rst take it out of the box. This mode allows you
to manually select any one of the 61 available AF points.
Once selected, this AF point will remain the only active
point for autofocus, until you either shift it to a different
location within the 61-point array, or switch to a different
AF area mode. A single square-shaped “box” on the focus
screen indicates the location of the active AF point.
Spot AF
Think of this as a more narrow-angle version of Single-
Point AF. As with Single-point AF, you can select any one
of the 61 AF points and shift it to any location within the
61-point array. A single square-shaped “box” with a dot in
the center indicates the location of the active AF point.
Spot AF is ideal for focusing on subjects that are
small in relationship to the full frame and that may have
larger subjects in the foreground. Because of the need for
precision placement, spot AF is better suited to station-
ary subjects than fast-moving subjects. Spot AF may also
take longer to achieve focus than other AF area selection
modes, especially if you place the Spot AF point on an
area that lacks detail or is low in contrast.
AF point expansion
(4 points surrounding the primary AF point in the center)
AF point expansion/surround
(8 points surrounding the primary AF point in the center)
With either expansion mode, several secondary AF points
are clustered around one primary AF point. You can freely
move the primary AF point anywhere within the 61-point
AF area. The camera will automatically activate the
secondary focus points any time the central primary AF
point can’t detect enough detail or contrast to focus on.
Working with an expanded area of active AF points can
thereby make it easier to keep the AF system locked on a
moving subject, especially if the subject movement is er-
ratic. AF point expansion also provides back-up AF points
when you’re shooting subjects with large areas that lack
texture and detail.
Zone AF
Although Zone AF may look like a larger, 9~12 point clus-
ter version of AF point expansion, there is an important
difference: With Zone AF the camera will always attempt
to focus on the nearest subject it detects within the active
zone of AF points. Zone AF is also the only way to have
the AF system focus on the nearest subject when focus-
tracking a moving subject in AI Servo AF. You can move
the AF zone to any one of nine pre-set locations within
the 61-point array.
61-point automatic selection
In this mode, all 61 AF points are active. As long as
your subject is within the 61-point array, the camera will
automatically select whatever AF point is necessary to
maintain focus. How it does this will depend on your
focus mode:
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