Skip Talbot <Ski### [at] aolcom> wrote:
> In a vaccuum, do bright objects generate halos when photographed?

  Yes, of course.

  There are, naturally, different types of halos. One type is caused by
the properties of the film to which the scene is photographed.
  The camera is always calibrated for a certain maximum brightness. This
is done by adjusting the shutter speed and aperture and by the choice of
film type (its ISO value etc).
  What happens when something is brighter than what the film can register
under these settings? What happens is that the film gets overexposed at
that part and color-bleeding occurs. It's this color-bleeding which looks
like "halos" around the overbright objects.

  Sometimes this effect is even purposedly enhanced by putting a filter
in the lens of the camera which slightly scatters light. This makes
everything look smoother and a bit fuzzier/blurred.

-- 
                                                          - Warp

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