Canon USA now officially released the firmware update for Canon EOS 5D Mark III.
This version is V 1.2.1, now you can download this firmware update from Canon USA website here.
The new firmware update adds two highly useful features: a clean HDMI output option and cross-type AF at f/8. See more detail here.
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This firmware update affects non-Canon batteries. If you use a non-Canon battery, the camera will now refuse to communicate with it. You can still use the power, but you can no longer display the battery status information.