Pentax K-m/K2000 Operating Manual page 129

Using the Mirror Up Function
Use the Mirror Up function if camera shake is evident even when remote
control unit (optional) is used with a tripod.
When shooting with the 2 sec. Self-Timer, the mirror pops up and the
shutter is released 2 seconds after you press it, thereby avoiding the
vibration of the mirror.
Follow the procedure below to take a picture with the Mirror Up function.
1
Mount the camera onto a tripod.
2
Z
Select in the Drive Mode.
Refer to Steps 1 to 5 on p.125 for details.
3
Press the shutter release button halfway.
The autofocus system operates. The focus indicator ] appears in the
viewfinder when focused.
4
Press the shutter release button fully.
The mirror pops up and a picture is taken 2 seconds later. AE lock is
enabled with the exposure value set immediately before the mirror pops
up.
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