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AiAF stands for Artificial Intelligence Auto Focus. It is a system devised by Canon that assists a digital camera in obtaining a focus automatically. It selects a focus point from a set of 3, 5, or 9 (depending on camera model) based on factors such as motion and subject position.
AiAF is available in 3, 5, and 9 point options. The levels correspond to the number of different points the AiAF has to work with. The higher the points, the more accurate the focus.
External link
Canon's Website (http://www.canon.com/)
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