[rollei_list] Re: Schott Glass
- From: CarlosMFreaza <cmfreaza@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Mon, 9 Aug 2010 20:55:50 -0300
2010/8/9 Marc James Small <marcsmall@xxxxxxxxxxx>:
> I am surprised by the ignorance of Schott on this List, as EVERY Rollei TLR
> camera yet made has come with Schott glass. Schott is the heavy-hitter in
> optical glass, and even Hoya makes their glasses to fit the needs of the
> Schott Catalogue, the industry standard.
Marc:
Since you wrote about the ignorance of Schott on this List,
I must say some of this list members and former members had an intense
thread about Schott and Zeiss and Rollei and Hoya and Ohara in 2006, I
believed it was on this list but it happened in other forum, I even
obtained an answer from Prochnow for one of the issues in discussion,
the thread and some of the messages are so large I couldn't copy them
here, these are some samples:
--- El mar 25-jul-06, Carlos Manuel Freaza <cmfreaza@xxxxxxxxxxxx> escribió:
> Schott also publish the Schott Glass
> Catalog, which is
> a standard reference for the properties of the many
> optical glasses produced by them and other companies.
>
> Carlos
-------------------------------------------------------------
Mr. Prochnows answer:
"..For the 35 models: The glass for these lenses,
which were made in Germany, has been delivered by
Schott; this is also the matter with MOST the lenses,
which were made in Singapore. Certainly the quality of
all the lens-materials were the same. The glass were
bought all over the world. In this case it was
possible that some glass-parts has been bought from
Hoya. The lense-parts were made from "Presslingen"
(glass blancs, cut out off a roll of glass). The
Schneider Xenar-lenses for the Rollei 35 were made by
Schneider in Kreuznach, certain from German glass and
Presslingen.
The lenses for the SL35 etc. were made in Geramny
after 1981 (Rollei and Zeiss) and when requested also
sold via the Singapore branche. The Pricelist must
show these circumstances.
With many greetings,
Claus Prochnow"
----------------------------------------------------
"Kornelius J. Fleischer , jul 06, 2000; 02:46 a.m.
Come and see for yourself! This is what I have seen
with my eyes: Rollei really operates their own lens
element production at their headquarters in
Braunschweig, Germany - everything included. And it is
a pretty modern one, using the same advanced machines
that Zeiss uses in their new lens element production
facility. The optical glass is purchased from Schott
Glass Works (belonging to the Zeiss Foundation) and
other sources. Production and assembly is carried out
according to Zeiss specifications. Original Zeiss
measuring equipment is used at the Rollei lens
manufacturing site for quality assurance.
Rollei makes an older Distagon 4/50, an older Planar
2,8/80 for SLR, a Planar 2,8/80 for TLR, a current
Sonnar 4/150, and a current Sonnar 5,6/250. I have
tested their Sonnar lenses and compared with the
current Zeiss versions for Hasselblad: They perform
exactly the same. I also have their Distagon 4/50 and
the Planar 2,8/80 and use these with Rolleiflex 6008i
and 6001 cameras. They deliver professional results.
Those lenses in the Rollei range that bear the name
Carl Zeiss are actally made alongside the same types
for Hasselblad at Zeiss Oberkochen. Ideally, the
optical systems should be exactly the same. But since
the Rollei shutter device is much bigger than the
Prontor shutter in the Hasselblad lenses, taking space
with metal where glass can be in the Hasselblad
version, modifications are needed in some cases. So
not all lenses elements can be exactly identical."
------------------------------------------------------
WIKIPEDIA REDIRECTED FROM SCHOTT GLASS:
Schott Glass
From Wikipedia, the free encyclopedia
(Redirected from Schott AG)
Jump to: navigation, search
Schott Glass AG is a manufacturer of high-quality
industrial glass products, such as fiber-optics and
components used in flat panel displays.
They are well known by the photographic community for
manufacturing the glass components of Zeiss and
Schneider Kreuznach lenses as well as B+W filters.
They also publish the Schott Glass Catalog, which is a
standard reference for the properties of the many
optical glasses produced by them and other companies.
The company was founded in 1884 at Jena, Germany as
the Glastechnische Laboratorium Schott & Genossen by
Otto Schott, Ernst Abbe, Carl Zeiss and Roderich
Zeiss. The company later changed its name to Jenaer
Glaswerk Schott & Genossen. After the Second World
War, the company was forced to relocate to Mainz in
West Germany as the Schott Glaswerke AG after the
headquarters in Jena was taken over by the communist
East German government and became the Jena Glaswerke
VEB. After the German reunification, Schott Glaswerke
AG acquired Jena Glaswerke VEB to become a single
company again.
http://en.wikipedia.org/wiki/Schott_AG
-------------------------------------------------------
FROM CARL ZEISS SITE (Lens Production Vritual Tour)
We purchase our optical glass preferably from the
Schott Glass Works. Of particular importance here are
the optical properties of the different glass
materials and their tolerances. When choosing our
suppliers, we also take into account their delivery
capabilities and delivery times, their prices and the
environmental soundness of their products. In our
optical production, we currently process 114 types of
optical glass with different refractive indices, color
dispersion, weight, etc. This results in a spectrum of
approx. 350 different types of lens elements with
approx. 700 different radii. Each lens consists of
several optical glass materials and crystals, with
some almost as heavy as steel and others more
expensive than gold."
-----------------------------------------------------------------------
Carlos
---
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