Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 392

Note Available when [ : Movie Servo AF] is set to [Enable] and [ set to [Spot AF] or [1-point AF]. : AF method] is Operation when [ : AF method] is set to an option other than [Spot AF] or [1point AF] is equivalent to setting [AF speed] to [Standard(0)]. An asterisk "*" to the right of [ : Movie Servo AF speed] indicates that the default setting has been modified. Movie Servo AF track sens. You can adjust the tracking sensitivity (to one of seven levels), which affects responsiveness if the subject strays from the AF point during Movie Servo AF, as when interfering objects move across AF points or when you pan. Locked on: -3/-2/-1 With this setting, the camera is less likely to track a different subject if the main subject strays from the AF point. The closer the setting is to the minus (-) symbol, the less the camera is inclined to track a different subject. It is effective when you want to prevent the AF points from rapidly tracking something that is not the intended subject during panning or when an obstacle cuts across the AF points. Responsive: +1/+2/+3 This makes the camera more responsive when tracking a subject that covers the AF point. The closer the setting is to the plus (+) symbol, the more responsive the camera is. It is effective when you want to keep tracking a moving subject as its distance from the camera changes or to rapidly focus on another subject. Note Available when [ : Movie Servo AF] is set to [Enable] and [ set to [Spot AF] or [1-point AF]. : AF method] is With [ : AF method] set to an option other than [Spot AF] or [1-point AF], operation is equivalent to a setting of [0]. 392