Canon EOS-1D C EOS 1D X Instruction Manual - Page 72
AF Area Selection Modes
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AF Area Selection Modes Single-point Spot AF (Manual selection) Although this is the same as Single-point AF, the selected AF point covers a smaller area to focus. Effective for pinpoint focusing of overlapping subjects such as an animal in a cage. Since Spot AF covers a very small area, focusing may be difficult during hand-held shooting or for a moving subject. Single-point AF (Manual selection) Select one AF point to be used for focusing. AF point expansion (Manual selection ) The manually-selected AF point and adjacent AF points (above, below, on the left and on the right) are used to focus. Effective when it is difficult to track a moving subject with just one AF point. With AI Servo AF, the manually-selected AF point must focustrack the subject first. However, it is easier to focus the target subject than with Zone AF. With One-Shot AF, when focus is achieved with an expanded AF point, the expanded AF point will also be displayed along with the manually-selected AF point . 72