Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 378

Subject switching • Initial priority Tracks the subject initially determined for AF, to the extent possible. • On subject Generally tracks the subject initially determined for AF. May switch to other subjects if the current subject is no longer suitable for AF. • Switch subject Switches to track other subjects in response to shooting conditions. Caution Precautions when set to [Initial priority] The camera may not be able to continue tracking subjects under some subject conditions. • If subjects move vigorously • If subjects face a different direction or change their posture • If AF points stray from subjects, or if subjects are hidden behind obstructions and you can no longer see them With [AF priority (People)] set to [Enable], the camera may switch to the face or head, depending on subject conditions. Subjects selected by touch will be tracked to the extent possible regardless of the option set in [Subject tracking settings]. 378