All pics, have a dark spot in their left central area
This Canon Powershot A4000IS camera is virtually new. This problem was not manifest when I first got the camera. I believe the dark spot in the pictures may be caused by a bit of dust on the sensor or its protective glass. It is visible in the displayed image also. The spot is visible on the display before taking a picture, and does not move during "optical" zoom. It will move off the display during digital zooming only. (How) can I open the camera far enough to clean away the problem?
Since this an almost new camera, (less than 100 shots thru it and it has not been used in any dusty/sandy locales), this could be a common problem with this model/series affecting many users.