P3D Re: Diffusers

[Greg Erker <erker@xxxxxxxxxxxxxx>]

>They diffuse too much. Ususally a full hemisphere. You need this if
>there is no condenser lens. But if you use a condenser lens then you
>only need to diffuse enough to fill your eyepiece. For an f/2 eyepiece
>that would be a 28 degree cone. That is only 1/64 of a hemisphere. In
>other words, 64 times as much light at the eyepiece with very little
>light wasted illuminating the full interior of the box.

Tom,

Any chance of doing a drawing showing
all the optics you have in mind? (Showing
light cones etc). If you can generate
a gif or jpeg I'll put it up on my web
page.

I think I understand what you have in
mind but others may not, and a drawing
may show why a controlled diffuser is
what you need.

Greg E.

Medium format stereo and more:
http://www.angelfire.com/ca/erker