Re: Taylor-Merchant stereoscope lenses

[P3D Jim Crowell <crowell@xxxxxxxxxxxxxxxxx>]

At 8:40 PM 8/6/96, P3D John Bercovitz wrote:

>OK, I looked it up.  The lowest dispersion common optical plastic
>has a substantially lower Abbe number than the commonly-used BK7
>optical glass although their refractive indices are similar, which
>surprised me.  I thought plastic had a lower refractive index.
>Well, maybe non-optical plastics do.

They make spectacle lenses now out of polycarbonates &
"high-index plastics" that I think have a higher refractive
index than glass.  The chromatic abberation is pretty horrendous
though.

-Jim C.


------------------------------------------------
Jim Crowell
School of Optometry
360 Minor Hall
University of California
Berkeley, CA 94720-2020
(510) 642-7679
jim@xxxxxxxxxxxxxxxxx
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