Canon EOS1DBODY 사용자 설명서

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 Customizing AF Functions
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.
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Auto AF point selection: EOS iTR AF
 
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.
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