Pentax K-X Operating Manual page 68

Shadows may appear in the image on white backgrounds and other
shooting conditions if the CMOS sensor becomes dirty or dusty. This
indicates that the CMOS sensor must be cleaned.
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Shaking the CMOS sensor removes dust that has collected.
1 Select [Dust Removal] in the [_ Set-up 4] menu and press
the four-way controller (,).
2
The [Dust Removal] screen appears.
Press the
OK
button.
The Dust Removal function is activated
by shaking the CMOS sensor.
To activate the Dust Removal function
every time the camera is turned on, select
[Start-up Action] and use the four-way
controller (• • ) to select _.
When Dust Removal is completed, the
camera returns to the ['_ Set-up 4] menu.
Dust Removal
Start-up Action