Found
on a standard photograph these can be caused by crystals in the developing
fluid that leave a ring on the picture. They can also be caused by the
refraction of the light in the camera lens in both digital & in a standard
film camera- particularly if you are filming directly into a light source or
towards a reflective surface. Dust floating close to the lens will also catch
sunlight & appear to be a ball of light. This is particularly the case if
the background is dark & the light source if from the side. While most can
be explained, some cannot.
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