Canon EOS-1D C EOS 1D X Instruction Manual - Page 96
ON: Enable, OFF: Disable, Auto AF point selection: EOS iTR AF
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3 Customizing AF Functions 24 Auto AF point selection: EOS iTR AF When the AF area selection mode is set to 61-point automatic selection AF or Zone AF, AF is possible while using the subject's color or face detection information. Using this function makes it easier to continue focusing a moving subject with AI Servo AF. Using this function also makes it easier to focus human subjects in One-Shot AF mode. ON: Enable The AF point is automatically selected based on the AF information combined with the color and facial information of the subject. With AI Servo AF, the color of the area where focus is initially achieved is recorded. The camera then tracks that color by switching AF points. If a human face is detected, the AF tracking and AF point switching switch to this face. With 61-point automatic selection AF and AI Servo AF, you can manually select the initial AF point to be used to focus. If multiple faces are detected, the camera focuses using the AF point on the optimum face given current conditions. With One-Shot AF, the camera selects the AF point based on face position information, and you can give priority to composition when taking the picture. OFF: Disable The AF point is selected automatically based only on the AF information. When [Auto AF pt sel: EOS iTR AF] is set to [Enable], focus will take slightly longer than with [Disable]. Even if you set [Enable], the desired result may not be obtained depending on the shooting conditions and subject. Under low-light conditions when the flash emits the AF-assist beam automatically, the AF point is selected automatically based only on the AF information. (The AF does not use facial information.) Face detection may not work if the face is small or in low-light condition. 96
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