Slains Castle

by pakman

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That is dust on the sensor (well the IR filter over your sensor), dust specks in the lens are not capable of causing spots on the image like this. The reason you can see them at a small aperture and not at a large one is that the light rays are far more linearly aligned at f22, hence they cast a shadow - remember the surface of the filter where they sit is ...


This is the typical appearance of sensor dust. Dust on the lens rear element will never be so well defined, won't be aperture dependent, and will be visible throuh the viewfinder, while sensor dust, of course, is only in the picture. Dust on the front element won't be visible as specks at all, it will decrease contrast in a more vaguely defined area. You ...

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