12

1 0 1 5 f tm

MF AF

22 16 8 4 4 8 16 22

A 2 2 16 11 8 5.6

2 .8

How to focus on the subject with the aid of the matte field

1.Set the lens in the manual focus position.

2.While looking through the viewfinder, turn the focusing ring to the right or left until the image in the viewfinder is clearest.

63

HARD-TO-AUTOFOCUS SUBJECTS

The autofocus system is highly precise, but not per- fect. Depending on the brightness, contrast, shape, and size of your subject, the autofocus system may not operate. In such a case, use the focus-lock technique (see page 60.) on another subject that is the same distance away, or set the lens to use the manual focus mode to focus the lens on the subject with the aid of the matte field in the viewfinder.

Subjects which may fool the autofocus system include:

a)Extremely low-contrast subjects such as a white

wall in the autofocus frame [ ].

b)Subjects which don’t reflect much light in the aut-

ofocus frame [ ].

c)Subjects which are moving too fast.

d)Multiple subjects in the foreground and back-

ground of the autofocus frame [ ].

e)Subjects positioned against reflected light or strong backlight or with extremely bright back- grounds.

OPERATIONS ADVANCED