Canon PowerShot S1 IS User Manual page 141

You should not shoot images in
Assist) mode when using these attachments.
Although it is possible to select this mode on
the camera, the PhotoStitch software will not
be able to stitch the images together at the
computer.
To protect the conversion lens, hold the
camera's lens with one had and screw the
conversion lens onto the camera with the
other hand.
Completely remove all dust and dirt from
conversion lenses with a lens blower brush
before use. The camera may focus on any dirt
that remains.
Be careful when handling the lenses so as not
to get fingerprints on them.
Once the lens adapter is screwed on the
camera, it locks into place. When removing
the wide converter or the tele-converter, do so
while firmly pressing on the lens adapter with
your hand to avoid damage to the lenses.
(Stitch
Appendix 139