Pentax OPTIO M10 - Manual (Page 41)

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The shutter release button works in a two-step action as follows.
Press halfway
The focus and exposure are locked when the shutter release button is
pressed halfway. The green focus frame lights on the LCD monitor when
the shutter release button is pressed halfway and the subject is in focus.
If the subject is out of focus, the frame will light red.
Press fully
Press the shutter release button all the way down to take the picture.
The image appears on the LCD monitor for one second (Instant Review)
immediately after it is captured. You can change the Instant Review time.
(p.82)
You can delete the image during Instant Review by pressing the i button.
Using the Shutter Release Button
Instant Review
[Poor focusing conditions]
The camera may not be able to focus under the following conditions.
In this case, lock the focus on an object the same distance away as
the subject (by pressing the shutter release button halfway), then aim
the camera at your subject and press the shutter release button fully.
• Objects that lack contrast such as a blue sky or white wall
• Dark places or objects, or conditions that prevent light being reflected
back
• Horizontal lines or intricate patterns
• Fast moving objects
• When there is an object in the foreground and an object in the background
in the same picture
• Strongly reflected light or strong backlighting (bright background)