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78
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
79 to 85.
About the 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 vertical AF points 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, it 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
f/5.6 vertical
focusing
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
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