Panasonic DMC-F2 - Manual (Page 123)

Others
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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 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 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 clicking sound is heard, and this sound may be recorded on the motion pictures.
This is not a malfunction.