Canon 1D X User Guide (en)
<<<To EOS-1D X Users Updating the Camera Firmware to Version 1.1.x>>>
This manual is for the EOS-1D X installed with firmware version 1.1.0 or later.
Please refer to the pages below for further information about the new functions added by firmware
AF when the maximum aperture is f/8
AF points illumination in red during AI Servo AF
AF with group H lenses: AF point expansion
(surrounding AF points: above, below, left, right)