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BIG chunks of glass

  • From: Paul Talbot <ptww@xxxxxxxxx>
  • Subject: BIG chunks of glass
  • Date: Thu, 21 Oct 1999 17:16:56 -0500
Michael Kersenbrock wrote:
 
> P.S. - My saturn viewer kit just arrived.  Wow, the
>        lenses are BIG chunks of glass!  :-)

They are indeed!  A pair of them weigh 5.2 ounces.  I
have another lens that we evaluated for possible use
in the viewer.  By comparison, a pair of those weighs
about 4.4 ounces.  So the lenses in the kit are almost
20% heavier.  The lighter, thinner lens has severe
pincushion distortion problems.  I don't know anything
about optical design, but it appears that the extra
thickness of these lenses provide a very worthwhile
benefit.

Paul Talbot