P3D Diffused light question

[markaren@xxxxxxxxx (Karen Obusek)]

Hi folks! I have been pairing small 1/2 frame radex viewers together by
using a strip of translucent plastic obtained by cutting up those white
plastic milk jugs. I glue each viewer to the strip at a proper occular
distance, and the result is a respectable stereo image that can fold up
and fit in a shirt pocket. Some of you may have seen my idea in Dr. T's
/ Ohio Srereo Newsletter. Well, OK ..Here's my question. Some plastic
cartons are thicker than others, and some allow more light to pass than
others. When I cut the plastic, I hold a piece up to the light to check
the diffusion/ translucency characteristics and noticed something I have
never noticed before. While holding the plastic up to florescent light,
the light through the plstic appears yellow. Same thing occurs with
varying wattages of tungsten bulbs. I suspect it may hav something to do
with frequency filtering or diffraction principles. Or could it be from
crude materials in the plastic etc. Can somebody attempt to
scientifically explain this phenomenon to me? Are ND filters color
corrected to prevent this effect? Or does this only occur with diffusion
as opposed to density changes? Thanks.   Mark Dottle


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