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Re: [ATM] Plastic.....

Russell Jocoy wrote:
>
>      But I have yet to see a 6" refractor's primary len's made of this 
> substance, or it's air tight mate on the back side. And also can you imagine 
Actually, the polycarbonate lens would more likely play the "flint" role,
but that's not saying a Steinheil configuration is not to be considered.

According to the Handbook of Optics, there is a problem with working in
plastic.  Paraphrasing, the surface never seems to heal:

   "Closer examination [of the surface], however, reveals surface
    microstructure which probably does not fall within the standards
    normally associated with precision optics."
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