If AF point expansion is selected with an f/8 maximum aperture lens/extender combination, the four AF points surrounding the center point will act as AF Assist points. This option effectively expands the size of the AF detection area to enhance autofocus performance with subjects that are small in the frame and difficult to track, such as small animals and birds in flight. AF points above and below the center will be sensitive to vertical contrast, while points to the left and right will be sensitive to horizontal contrast.Please visit the following website for complete information on the firmware update: www.usa.canon.com/eos1dxfirmwareupdate
Canon U.S.A. Expands The EOS-1D X Digital SLR Camera Autofocus Capabilities With New Firmware Update
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