Quote:
Originally Posted by cwmoser
BTW, you mentioned the Fresnel Lens Screen - can you tell me more about it
as compared to the screen in the Philco 48-2500.
Carl
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Hi Carl, The main difference between the Philco and the RCA is the Philco is a front projector and the RCA is a rear projector.
The RCA screen is a flat sheet of translucent Plastic with a series of fine concentric rings molded into it to amplify the light.
Wiki has an article about how
Fresnel lenses work.
The Philco uses a sheet of Stainless Steel mounted so it's forced into a slight parabolic shape.
It has fine vertical grooves cut into it and is coated with a Lacquer type coating that contains microscopic glass beads to reflect and disperse the light hitting it.