[rollei_list] Re: Zeiss Jena 5cm 1.5 Opton
- From: "Raid Amin" <ramin@xxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Sun, 6 Sep 2009 16:18:47 -0500
Thank you, Mark. So if I have two such lenses, one with T and one without T,
they are basically of equal quality/value.
This is good to know.
Raid
-----Original Message-----
From: rollei_list-bounce@xxxxxxxxxxxxx
[mailto:rollei_list-bounce@xxxxxxxxxxxxx] On Behalf Of Marc James Small
Sent: Sunday, September 06, 2009 4:16 PM
To: rollei_list@xxxxxxxxxxxxx
Subject: [rollei_list] Re: Zeiss Jena 5cm 1.5 Opton
At 05:00 PM 9/6/2009, Richard Knoppow wrote:
>
>Is there an optical/value difference between a Zeiss Jena
>5cm 1.5 Opton
>T and another lens without the T?
>I have one lens with serial number 1127xxx and one with
>1137xxx.
>
>Raid
>
>the T means the lens is coated using a Zeiss proprietary
>multiple coating. I am a little puzzled about the Opton name
>since I believe that this was a trade mark required on
>lenses made by the West German Zeiss operation for a time.
No. The T-mark means that the lens is single
coated, and was not used after 1953 or 1954. The
T* mark indicates multiple coating and has been
used since 1978. (There is also another mark, P*
for phase coatings which is used on sports optics
and scientific gear as appropriate.)
To make a very long story short, Zeiss continued
to operate as an entity from 1945 until
1949. The US Army wanted a lens-production
facility in their Zone of Operations for the
production of lab gear and aerial recon lenses
for the impending invasion of Japan, DOWNFALL,
just in case the Soviets opted not to join
in. So, other plants were used -- Eisfeld and
Coburg in 1945 and 1946, while a new facility was
developed at Oberkochen. Lenses made there were
marked "Zeiss-Opton", the latter part standing
for OPTicalische werke ObercocheN. Following the
final split between the two Zeiss entities in
1949, Oberkochen claimed the rights to the Zeiss
intellectual properties and was awarded these in
1954 by a Dutch court, after which the
Zeiss-Opton name was phased out and replaced by "Carl Zeiss".
There have been three versions of the 1.5
5cm/50mm Sonnar. The original Jena design
remained in production through the War and was to
be the design cloned by the Soviets as the ZK and
Jupiter-3 lens. There was a mild redesign at
Jena around 1948, and the Oberkochen lens is
similarly slightly tweaked. There is no
practical difference between these designs in
use, so I suspect the changes were made to help
production economics rather than optical performance.
Marc
msmall@xxxxxxxxxxxx
Cha robh bàs fir gun ghràs fir!
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