Canon EOS-1D C - Manual (Page 75)

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The camera’s AF sensor has 61 AF points. The illustration below shows
the AF sensor pattern corresponding to each AF point. With f/2.8 or
larger maximum aperture lenses, high-precision AF is possible at the
viewfinder center.
Depending on the lens attached to the camera, the number of usable
AF points and AF pattern will differ. For details, see pages 76 to 82.
About the AF Sensor
These focusing sensors are geared to achieve higher
precision focusing with f/2.8 or larger maximum aperture
lenses. A diagonal cross pattern makes it easier to focus
subjects that may be difficult to focus. They cover the five
vertical AF points at the center.
These focusing sensors are geared to achieve high-
precision focusing with f/4 or larger maximum aperture
lenses. Since they have a horizontal pattern, they can
detect vertical lines.
These focusing sensors are geared for f/5.6 or larger
maximum aperture lenses. Since they have a horizontal
pattern, they can detect vertical lines. They cover the three
columns of AF points at the viewfinder’s center. The center
AF point, and the AF points above and under the center AF
point are geared for f/8 or larger maximum aperture.
These focusing sensors are geared for f/5.6 or larger
maximum aperture lenses. They can detect horizontal lines
and cover all 61 AF points in a vertical pattern. The center
AF point, and the AF points on the left and right of the center
AF point are geared for f/8 or larger maximum aperture.
Diagram
Cross-type focusing: f/4 horizontal + f/5.6 vertical
Dual cross-type focusing:
f/2.8 right diagonal + f/2.8 left diagonal
f/5.6 vertical + f/5.6 horizontal
Cross-type focusing:
f/5.6 vertical + f/5.6 horizontal
f/5.6 vertical
focusing
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