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Originally posted by Beamish
Do digital cameras only capture dust reflections at certain angles or in specific light conditions? I say this as I took several photos in total darkness in a cave in County Cork and only captured orbs in one of them. The conditions were the same each time; dark, cold and moist.
Color difference in orbs is caused by "chromatic distortion" which is a fancy way of saying that our eyes perceive different wavelengths and shapes as varying colors. If a particle happens to be of a certain makeup or shape, it will tend to absorb certain wavelengths of light and reflect others, thus giving the perception of a certain color.