Pentax K-5 Operating Manual page 146

144
6
Press the shutter release button halfway.
The autofocus system operates. The focus indicator ] appears in the
viewfinder when focused.
7
Press the shutter release button
fully.
For g, 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
4
is pressed fully.
For Z, the shutter will be released about
2 seconds after the shutter release button
is pressed fully.