[rollei_list] Fw: Re: Re: 'Old' Zeiss glass question
- From: Peter J Nebergall <iusar4s@xxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Fri, 28 Apr 2006 12:47:44 -0500
-NOT exactly what I meant. Was the uncoated Sonnar 50mm 1.5 produced
alongisde the coated one? Were the Rollei Tessars produced concurrently,
or does the1 replace the other?
PJN
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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