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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 100-108.
AF Sensor
These focusing sensors are geared to obtain 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
AF points vertically aligned at the center.
These focusing sensors are geared to obtain 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 adjacent AF points at the top and bottom are
compatible with f/8 or larger maximum-aperture lenses.
These focusing sensors are geared for f/5.6 or larger maximum
aperture lenses. Since they have a vertical pattern, they can
detect horizontal lines. They cover all 61 AF points. The center
AF point and the adjacent AF points on the left and on the right
are compatible with f/8 or larger maximum-aperture lenses.
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
f/5.6 vertical
focusing
Cross-type focusing:
f/5.6 vertical + f/5.6 horizontal