The "white eye" effect seen in many animal shots is not caused by telephoto
lenses. It is the result of light reflecting off of the tapetum lucidum, a
highly reflective layer behind the photoreceptor cells of the retina. This
gives a white, greenish, or yellowish reflection of light from your flash
(or car headlights). Humans (and some animals) lack this layer, so your
flash reflects from the retinal blood vessels, causing "red eye." There is
even a special pen for animal "green eye" that is sold by the people who
make the red eye pens. I suppose there is a big market for these with
current P&S camera designs putting the flash so close to the lens.
Perry Bain
bainp@xxxxxxxxxxxxxxxxxxx
Warren Kato wrote:
>From telephoto distances, the reflections from the retina look white.
Maybe
you've seen fill flash animal shots in the dark in National Geo. magazine.
The red eye is actually white eye. It has something to do with the
distance I
suppose. Catch light is something different.
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