[rollei_list] Re: 'Old' Zeiss glass question

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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