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Re: Wollensak vs. Revere lenses/viewers

  • From: P3D Dr. George A. Themelis <fj834@xxxxxxxxxxxxxxxxxxxxx>
  • Subject: Re: Wollensak vs. Revere lenses/viewers
  • Date: Wed, 17 Sep 1997 16:28:54 -0400 (EDT)
Eric G. writes:

>My particular version of myopia has me close to the limit of travel with
>R lenses, so the additional 5 mm (47 mm vs 42 mm) actually improves the
>situation for me.

Good point!  I have put Wollensak lenses in a red button viewer for a
person who was running out of focusing range when using the viewer without
glasses.  The Revere lenses match the FL of the rb viewer but in this
case the Wollensak lenses was a better choice.  BTW, the official numbers
are 44 mm for the Revere (and red button) and 47 mm for the Wollensak.
The difference is only 3 mm but it is a significant fraction of the
total rack length which is about 10 mm.

>This does lead to a question... it;s been stated on this list that the
>Revere 22 and Wollensak 10 were identical except for the fl of the glass
>(and color/logo). Wondering if the focus rack is different to accomodate
>this difference...

Yes, it is...

George Themelis


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