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P3D Re: Precision

  • From: Greg Erker <erker@xxxxxxxxxxxxxx>
  • Subject: P3D Re: Precision
  • Date: Mon, 22 Nov 1999 09:35:41 -0700
>>   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

  Compared to regular diffusers these
are very efficient so you don't waste
a lot of the light by scattering it
in directions that don't end up going
through the eye piece.

  If they were only (say) $10 a piece
they might be worth using to have a
viewer that runs for 10's of hours
using white LEDs. Given their high
price there are probably better methods.

Greg E.