AF Point Activation Area C.Fn-17

C.Fn-17 can be set to expand the AF point’s activation area to include the surrounding AF points. (C.Fn-17) (p.152)

Set Custom Functions with 3<n>.

• Expanding the activation area to 7 points C.Fn-17-1(p.152)

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

¡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 AF point(s) achieving focus will light.

:Selected AF point :AF points in expanded activation area

• Expanding the activation area to 7 or 13 AF points automatically

C.Fn-17-2 (p.152)

As shown below, the AF point activation area expands automatically to suit the lens focal length and AF mode. This is effective when the subject’s movement is unpredictable.

AF

 

Lens Focal Length

Mode

Shorter than 200mm

200mm or longer

One-

 

 

 

 

 

 

 

 

 

 

 

 

Shot

 

 

 

 

 

 

AF

 

 

 

 

 

 

The AF activation area does not expand

The activation area expands by 1 AF point

 

 

 

automatically.

 

 

 

AI

Servo

AF

72