[rollei_list] Re: 'Old' Zeiss glass question

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?

Peter Nebergall

On Wed, 26 Apr 2006 20:56:43 -0400 Marc James Small <msmall@xxxxxxxxxxxx>
writes:
> At 12:17 AM 4/27/06 +0200, Thor Legvold wrote:
> >They started multicoating before the war (around '36) but didn't 
> >advertise it (military secret) until 1940, IIRC. Richard would know 
> 
> >exactly. Both the lenses in question are marked with the red T, 
> >indicating a multicoating.
> >
> >It will be fun trying them out, regardless.
> 
> 
> No, Thor.  Three companies independently developed single coating -- 
> Zeiss,
> under Alexander Smakula, Kodak, and Wollensak, and Ross also had 
> perfected
> the process but couldn't do anything with it do to the outbreak of 
> the War.
>  The first commercially marketed CZJ lenses date from 1937 (I own 
> one such
> lens, a 1.5/5cm Sonnar T for Contax RF), while Kodak began to coat 
> its
> commercial lens production in 1938 or 1939.  The coated Zeiss lenses 
> are
> marked with a red "T", while the coated Kodak lenses have a white 
> "L" on
> the lens ring.  Wollensak did not produce any coated photographic 
> lenses to
> my knowledge but did use coating on military production such as
> rangefinders and gunsights.
> 
> Zeiss ceased using the red "T" after the War, and the others also 
> dropped
> their proprietary marks shortly thereafter.  Zeiss revived the 
> marking, now
> a "T*" when they introduced multi-coating.
> 
> Marc
> 
> msmall@xxxxxxxxxxxx 
> Cha robh bàs fir gun ghràs fir!
> 
> 
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