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Re: TECH-3D digest 145

  • From: T3D Eric Goldstein <egoldste@xxxxxx>
  • Subject: Re: TECH-3D digest 145
  • Date: Fri, 18 Apr 1997 08:45:11 -0500
BobH sez-
> First the RR lens was at one time the common amateur lens as it was
> balanced around the diaphragm so gave no distortion! I believe it is
> two achromats, but there might be  a paired meniscus version??

Like Bob, my understanding is that the RR was a symmetrical pairing of
diway or twindar type lenses to minimize distortion. This is why some of
these were configurable as convertibles! I don't think the doublets were
typically achromat pairs, but not sure...

Eric G.


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End of TECH-3D Digest 146
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