Pentax K-5 Operating Manual page 66

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(Dust Alert)
Dust Alert is a function that detects dust adhering to the CMOS sensor and
visually displays the location of the dust.
You can save an image indicating the dust location and display it when
performing sensor cleaning (p.343).
The following conditions must be met before using the Dust Alert function:
- A DA, DA L, FA J lens or a D FA, FA or F lens that has an A (Auto)
position is attached.
The aperture is set to the A position when using a lens with an
aperture ring.
The mode dial is set to any mode other than _ (Movie).
- The focus mode lever is set to AF.S or C.
• The exposure time may be extremely long when using the Dust Alert
function. Note that if the direction of the lens is changed before processing is
complete, dust will not be detected properly.
• Depending on the subject conditions or temperature, dust may not be
detected properly.
• The Dust Alert image can only be displayed during sensor cleaning within 30
minutes from the time the image is saved. If more than 30 minutes elapse.
save a new Dust Alert image and then perform sensor cleaning.
• The saved Dust Alert image cannot be displayed in Playback mode.
• The Dust Alert image is saved only when an SD Memory Card is inserted.
I
Select [Dust Alert] in the [_ Set-up 4] menu and press the
four-way controller ( • ).
The [Dust Alert] screen appears.