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Have you ever noticed small darkish patches in areas of blue sky in landscape photos taken with your digital SLR? They're probably produced by dust on the image sensor. In most cases, it's not on the sensor itself but on the filter or protective glass that covers it; but the result is the same; it shows up on digital photos. Not all of them, though; in most cases, dust is only visible in shots with large areas that have minimal detail when the shot was taken with a small lens aperture.
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