Canon PowerShot S1 IS User Manual page 136

Problem
White dots or white Light from the flash has reflected off dust
asterisks appear on the particles or insects in the air. This occurs more
image frequently in the following conditions:
When shooting at the wide angle end.
When shooting with a high aperture value in
the aperture-priority AE mode.
Flash will not fire Flash set to Off.
Image not showing on Incorrect video system setting.
TV
Shooting mode set to
CF card image reading Currently used CF card has been formatted in a
is slow different device.
Recording images on
the CF card takes too
long
134 Appendix
Cause
This is a phenomenon that occurs with digital cameras and does
not constitute a malfunction.
Set the flash to Auto or On.
Set the video system to the appropriate setting, NTSC or PAL,
for your TV (p. 67).
(Stitch Assist). The output will not appear on a TV monitor in
Assist) mode. Shoot in a different mode.
Use a CF card formatted with this camera.
Solution
See Formatting a CF Card (p. 18).
(Stitch