[rollei_list] Re: Xenon is a Xenar!
- From: Marc James Small <msmall@xxxxxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Tue, 29 Mar 2005 13:29:28 -0500
At 02:47 PM 3/28/05 -0800, Richard Knoppow wrote:
> Despite a claim by Marc Small that the Xenotar type lens=20
>originated at Zeiss in the mid 1930's I can find no=20
>indication of that anywere. No early lenses of this sort=20
>appear in the Zeiss Index which is included in the LensVIEW=20
>program. Kingslake attrbutes the design to C.G.Wynne of Wray=20
>Optical dating from 1944, a lens called by Wray the Unilite.=20
>These are derived from the Planar/Biotar by eliminating the=20
>positive part of the cemented rear component and bending the=20
>resulting negative element. The Unilite/Xenotar still has=20
>symmetry so it has very good correction for coma, lateral=20
>color, and geometrical distortion along with the flat field=20
>and good correction for spherical typical of the Planar=20
>derivatives.
Richard
I do not recall ever making this claim other than, perhaps, noting that the
progenitor of the design is the Planar and Biotar, both Zeiss Jena designs.
Marc
msmall@xxxxxxxxxxxx=20
Cha robh b=E0s fir gun ghr=E0s fir!
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