Dust is a huge problem for CCDs.. . There are two main reasons for this.. . The first is that you use the same CCD for every image, unlike film where a new bit of film is slid into place for any picture. So any dust on a CCD affects every single picture, not just one.. . The second is that a CCD is much, much smaller than a frame of film, so dust particles are relatively much larger and much more visible.. . Dust, of course, leaves dark dropout spots in the image. All good cameras take measures both to reduce the chance of dust getting on the CCD (this is especially a problem in reflex cameras with interchangeable lenses, where the CCD is potentially exposed every time the lens is removed) and to computationally filter out the effects of dust before saving the image.