Pentax Optio M50 - Manual (Page 43)

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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 display when the
shutter release button is pressed halfway and the subject is in focus. If
the subject is out of focus, the frame turns red.
Press fully
Press the shutter release button all the way down to take the picture.
The image appears on the display for one second (Instant Review) immediately
after it is captured. You can change the Instant Review time. (p.101)
You can delete the image during Instant Review by pressing the i button.
Using the Shutter Release Button
Instant Review
• When the camera detects that the subject blinked, the message
“Closed eyes have been detected.” appears during Instant Review
(This function is called “Blinking Detection”). While the message
appears, press the Green button and choose [Delete] from the
menu to delete the taken image.
• Even when Instant Review is set shorter than [3sec], the message
appears for 3 seconds.
• When the Face Recognition function does not work, “Blinking
Detection” also does not function. Even if the subject’s faces are
recognized, “Blinking Detection” does not function when the
recognized faces are too small.
[Poor focusing conditions]
The camera may not be able to focus under the following conditions. In
these cases, lock the focus on an object the same distance away as the
subject (by pressing and holding 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)