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P3D Precision



>   BTW Edmund Scientific sells holgraphic
> diffusers in 25 and 50mm diameter. They
> have 10, 15, 20, 25, 30, 40, 60 and 80
> degree diffusing angles available.
> Unfortunately they are $90 and $130 a
> piece (25, 50mm). Part Number J54-492
> to -507.

QUESTION: Why would anyone want to use this material? Seems to me that the
apparent precision is not going to gain you anything. Regardless of the viewer,
most anything can be pressed into service for diffusion purposes. Extreme
precision is not important here.

RM