Pentax OPTIO A40 User Manual download pdf (Page 37)

Quick Start

Focus lock

When you have difficulty in auto focusing on a subject, try the

procedures below.

1 Find an alternate subject placed at the same distance

from the camera as the desired subject.

2 Focus on the alternate subject.

Locate it in the focus frame on the LCD monitor.

3 Press the shutter release button halfway.

The focus frame turns green when the camera is in focus.

4 While holding the shutter release button halfway, move

the camera to obtain the desired composition.

The focus is locked at the point you set in step 3 even if you

recompose. (Focus lock)

5 Press the shutter release button fully.

You may have difficulty in auto focusing on such subjects as:

• Subject contrast is very low. (a blue sky, solid white walls, etc.)

• Dark places, black objects, or subjects that cannot reflect light.

• Areas of strongly reflected light or backlit subjects

• Fine patterns

• Rapidly moving objects

• When a distant object and a close object are both in the focus frame.

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Pentax OPTIO A40 User Manual Page 37