Canon EOS 7D EOS 7D Instruction Manual - Page 89
AF Area Selection Modes
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AF Area Selection Modes The AF areas are explained starting with the smallest one. (1) Spot AF (Manual selection) C.Fn III -6 Although this is the same as single-point AF, the selected AF point covers a smaller pinpoint area to focus. Effective for pinpoint focusing overlapping subjects such as an animal in a cage. Since Spot AF covers a very small area, focusing might be difficult during hand-held shooting or for a moving subject. (2) Single-point AF (Manual selection) Select one AF point to be used to focus. (3) AF point expansion (Manual selection) C.Fn III -6 The manually-selected AF point and adjacent AF points 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 the expanded AF point, the expanded AF point will also be displayed along with the manually-selected AF point . 89