Canon EOS-1D C EOS 1D X Instruction Manual - Page 75

About the AF Sensor 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. Diagram Cross-type focusing: f/4 horizontal + f/5.6 vertical Cross-type focusing: f/5.6 vertical + f/5.6 horizontal 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 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 highprecision 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. 75