New answers tagged point-and-shoot
Every type of contamination on a camera lens is out of focus so the answer is that it would most definitely not cause 'graininess'. You may, however, notice a reduction in brightness or contrast of the image as less light will be going through the lens. All camera sensors produce visible 'noise', which used to be called grain in the days of film and which ...
Dirt can never cause grain. It's more likely you are seeing digital noise. Switching to lower ISO should help.
Yes, it's possible — but it's more likely that that's just how it is. You can't expect miracles from a point and shoot camera, and fine detail with no noise when "pixel peeping" would be a miracle. You say that the results are satisfactory for viewing as a whole on a computer screen. They'll also be fine when printed at reasonable sizes. In any case, it's ...
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