[rollei_list] Re: Fw: Re: Re: 'Old' Zeiss glass question

Anyone looking to buy a Contax RX--25mm Distagon F/2.8--50mm F/1.4 Plannar--180mm F/2.8 Sonnar--all in EX. $1900.00 + shipping.

-----Original Message-----
From: Peter J Nebergall <iusar4s@xxxxxxxx>
To: rollei_list@xxxxxxxxxxxxx
Sent: Fri, 28 Apr 2006 12:47:44 -0500
Subject: [rollei_list] Fw: Re: Re: 'Old' Zeiss glass question


-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 bÃs fir gun ghrÃs fir!


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