[simpits-tech] Fresnel Lens

[Robert Barringer]

I have a large fresnel lens, about 27.75" by 37". It's gotten kind of dirty 
from sitting in the garage and has a few scratches (kind of large, but on 
the edge of the lens so I don't think they'll cause much trouble). I am 
planning on building a Simpit soon, and would like to use this lens with it. 
I don't know anything about fresnel lenses. What type of display should I 
use? This is a very big lens. I'm thinking of getting as big of a TV as I 
can, since my video card has an S-video input. How far away from the display 
should I mount the lens? I'm sure I'll have to work everything out myself, 
but I could use some ideas.
Also, what's the best way to clean this thing? It has quite a bit of dust 
and dirt on it, and I don't want to damage it further.

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