If you have a digital SLR and change lenses, you probably have small dark spots on your images caused by dirt particles on the sensor. They in size, density and sharpness. You may see them on one image and not on the next.
Sensor dust spots are much more obvious at small apertures, and against clean areas such as a sky. In images shot with medium apertures they are larger and lighter gray. With wide enough apertures many may not show at all. They are also less obvious in very bright or very dark areas. Here is a portion of a sky shot with a dirty sensor.
more : adorama
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