[rollei_list] Re: 'Old' Zeiss glass question

At 08:41 AM 4/27/06 -0500, Peter J Nebergall wrote:
>This begs a question:  If Zeiss was producing coated lenses since 1937,
>were they simultaneously continuing uncoated lenses in the same formulae?
> I have 2 Contax Sonnar f1.5s  and 2 more f2s...  1 of each is coated. 
>When did they stop making uncoated lenses?

What a great query.  Zeiss at first only made coated lenses on demand as
the early process was rather expensive.  As a result, coated phtographic
lenses were sold in hard-money areas such as the US, prior to 1939, and in
Sweden thereafter.  Both of the Zeiss entities, Carl Zeiss Jena and
Zeiss-Opton/Carl Zeiss, had converted over to coated lenses by the early
1950's, when they ceased the use of the distinctive markings. Carl Zeiss
stopped this marking first, followed shortly thereafer by CZJ and Schneider
and the Soviets and even Mighty Kodak.

No optical company has ever ceased making uncoated lenses, as these have a
value in technical applications.  One certain microscope might call for a
coated lens, while another similar lens for another application might
require an uncoated lens.

Yu can still buy an uncoated lens from Carl Zeiss or JSK or Nikon or Leitz
or Canon or the like.  They sell a lot of them.

Marc


msmall@xxxxxxxxxxxx 
Cha robh bàs fir gun ghràs fir!


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