Panasonic Lumix DMC-FZ28 Operating Instructions Manual page 202

White round spots like soap bubbles appear on the recorded picture.
If you take a picture with the flash in a dark place or indoors, white
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round spots may appear on the picture caused by the flash reflecting of
particles of dust in the air. This is not a malfunction.
A characteristic of this is that the number of round spots and their
position differ in every picture.
[THUMBNAIL IS DISPLAYED] appears on the screen.
Is it a picture that has been recorded with other equipment? In such cases, these pictures may
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be displayed with a deteriorated picture quality.
A clicking sound is recorded in the motion pictures.
This unit automatically adjusts the aperture during motion picture recording. At such times, a
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clicking sound is heard, and this sound may be recorded on the motion pictures. This is not a
malfunction.
Others
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