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Re: [Rollei] 2.8B Biometar

At 03:31 AM 05/01/2001 -0400, you wrote:
>Here is link to the p-6 mount 2,8/80 Biometar specifications:
>Compare that lens with the lens specifications for the Rolleiflex:
> http://www.foto.no/rolleiflex/Rollei-9.html
>To me, the Xenotar looks closer then the Planar design to the p-6
>Biometar. I would think the Rolleiflex version of the Biometar would be
>like the Xenotar.
  The diagrams in Marc's article are actual schematics of the lenses. They
are the same or similar to the drawings in Prochnow's book. The Pentacon
drawing looks like it might be a generic one from something like Cox's book
on optics, which may not represent the actual construction of the Pentacon
  Some lens books show a single diagram for all lenses of this type despite
the existence of two or three variations. 
- ----
Richard Knoppow
Los Angeles,Ca.