Canon EOS-1Ds Mark III EOS-1Ds Mark III Instruction Manual - Page 167
C.Fn III -4, AI Servo AF tracking method, C.Fn III -5, Lens drive when AF impossible
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3 Custom Function Settings 1: AF priority/Drive speed priority For the first shot, focusing the subject is given priority. During continuous shooting, the continuous shooting speed is given priority over the focustracking of the subject. 2: Release/Drive speed priority For the first shot, shutter release is given priority over focusing the subject. During continuous shooting, the continuous shooting speed is given priority more than with setting 1. C.Fn III -4 AI Servo AF tracking method In the AI Servo AF mode while you are focus-tracking a subject, the camera can either continue focusing the target subject even if a closer subject (closer than at the main focus point) suddenly appears in the picture, or the camera can switch to focus the closer subject. *Main focus point = With automatic AF point selection: Center AF point With manual AF point selection + AF point expansion (C.Fn III -8-1/2): Manually-selected AF point 0: Main focus point priority The active AF point will switch to the main AF point and start focusing the closer subject. Convenient when you always want to focus the closest subject. 1: Continuous AF track priority Any closer subject appearing in the picture will be ignored as an obstruction. The main focus point does not take priority, so the tracking of the target subject can continue and switch to an adjacent AF point based on the preceding focusing result. Convenient when obstacles such as telephone poles go in front of the target subject. C.Fn III -5 Lens drive when AF impossible If autofocus is executed, but focus cannot be achieved, the camera can either keep trying to focus or stop. 0: Focus search on 1: Focus search off Prevents the camera from becoming grossly out of focus as it attempts to focus again. Especially convenient with super telephoto lenses which can become extremely out of focus. 167