Canon EOS 7D Mark II Wi-Fi Adapter Kit Manual

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The camera’s AF sensor has 65 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 with the 
center AF point.
Depending on the lens attached to the camera, the number of 
usable AF points and AF pattern will differ. For details, see pages 
100-
107.
AF Sensor
The focusing sensor is geared to obtain higher precision 
focusing with f/2.8 or larger maximum aperture lenses. A 
diagonal cross pattern makes it easier to focus on 
subjects difficult for AF. It is provided at the center AF 
point.
The focusing sensor is geared for f/5.6 or larger 
maximum aperture lenses. Since it has a horizontal 
pattern, it can detect vertical lines. It covers all 65 AF 
points. The center AF point and the adjacent AF points at 
the top and bottom are compatible with f/8 or larger 
maximum-aperture lenses.
The focusing sensor is geared for f/5.6 or larger 
maximum aperture lenses. Since it has a vertical pattern, 
it can detect horizontal lines. It covers all 65 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/5.6 vertical + f/5.6 horizontal
Dual cross-type focusing:
f/2.8 right diagonal + f/2.8 left diagonal
f/5.6 vertical + f/5.6 horizontal