AF Point Activation Area C.Fn-17

C.Fn-17 can be set to expand the AF point’s activation area to include more than one active AF point. (→p.137) See “Setting a Custom Function” on page 132.

•C.Fn-17-1 Expanding the activation area to 7 points C.Fn-17-1(→p.137)

This larger activation area makes it easier to focus subjects moving irregularly.

•The expanded AF point activation area is not

displayed in the viewfinder.

• When focus is achieved in the One-Shot AF mode, the selected AF point and the AF point(s) achieving focus will light.

: Selected AF point.

: AF points in expanded activation area.

•C.Fn-17-2 Expanding the activation area to 7 or 13 points automatically C.Fn-17-2(→p.137)

As shown below, the AF point activation area expands automatically to 7 or 13 points depending on the lens focal length, AF mode, and the subject’s speed in the AI Servo AF mode. This is effective when the subject’s movement is unpredictable.

AF Mode

 

 

 

 

 

Lens Focal Length

 

 

 

 

 

Shorter than 300mm

 

300mm or Longer

 

 

 

One-Shot AF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The activation area does not expand

The activation area expands by one point.

 

 

automatically.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

a

 

 

 

 

a

 

 

 

 

 

 

 

 

 

AI Servo AF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

For a slow-moving

 

For a fast-moving

For a slow-moving

 

For a fast-moving

 

subject

 

subject

subject

 

subject

∗To set the Custom Function, see “Setting a Custom Function” on page 132.

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