Canon EOS-1Ds Mark III EOS-1Ds Mark III Instruction Manual - Page 170
C.Fn III -8, AF expansion with selected point, C.Fn III -9, Selectable AF point
UPC - 013803079265
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3 Custom Function Settings C.Fn III -8 AF expansion with selected point In the AI Servo AF or One-Shot AF mode with manual AF point selection, you can increase the number of AF points by using the Assist AF points. Effective when it is difficult to track a moving subject with just one AF point. 0: Disable 1: Enable (left/right Assist AF points) The points on the immediate left and right (or top and bottom for a vertical shot) of the user-selected AF point become active. 2: Enable (surrounding Assist AF points) The points immediately surrounding the user-selected AF point become active. The AF point expansion centers on the selected AF point. Therefore, if a peripheral AF point is selected, the AF point expansion will be smaller as shown below. Assist AF point expanded by 1 point on left and right Assist AF point expanded by 1 point all around Selected AF point Expansion points Even when C.Fn III -9-1/2 is set, the expansion will take effect. C.Fn III -9 Selectable AF point 0: 19 points 1: Inner 9 points The user-selectable AF points will be limited to the inner 9 points. 2: Outer 9 points The user-selectable AF points will be limited to the outer 9 points. With settings 1 and 2, the selectable AF points and the selection pattern will be as shown below: Inner 9 points Outer 9 points Automatic selection Automatic selection Automatic selection Automatic selection 170