These
problems are the result of light reflecting from the surfaces of the CCD and
lenses inside the digital camera.
Both digital and conventional cameras are designed so as to eliminate as far
as possible any reflections from the respective surfaces inside the camera, but
when there is an extremely bright point in the image, or when there is a bright
point in an image that is otherwise completely dark, reflections of the bright
point may become noticeable.
Light sources of this sort that are outside the image can also have this effect.
Digital cameras are more susceptible to the problem of internal reflection than
conventional film cameras since they use a CCD instead of film, meaning that
there is another extremely flat and highly reflective surface inside the camera.
Internal reflections can occur in the form of faint images that should not be
there (ghosting) or a slight whitening of the entire image (flare). |
