Pentax K-5 Operating Manual page 151

8
7
Press the shutter release button halfway.
The autofocus system operates. The focus indicator O appears in the
viewfinder when focused.
Press the shutter release button
fully.
For _, the front and back self-timer lamps
start blinking slowly and blink rapidly 2
seconds before the shutter is released.
The beep is heard and the rate increases.
The shutter will be released about 12
seconds after the shutter release button
is pressed fully.
For _, the shutter will be released about
2 seconds after the shutter release button
is pressed fully.