[rollei_list] Re: Schott Glass
- From: Marc James Small <marcsmall@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Tue, 10 Aug 2010 01:45:06 -0400
At 07:55 PM 8/9/2010, CarlosMFreaza wrote:
> 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:
Carlos
Not to argue with you over your fine answer, but
these glasses from "other suppliers" were glasses
supplied under the Schott Catalogue. Schott
publishes an annual guide to its optical glasses,
listing the basic performance. For some decades,
Schott has farmed out the more routine glasses to
other manufacturers such as Hoya, and those
ordering such glasses from Schott will have the
orders filled by Hoya lens blanks. We had a nice
discussion of this over on the Leica Users' Group
some years back, when the LUG was still
film-oriented. None of this means that a
Hoya-supplied glass is not a Schott glass: it is
a glass made under license by Hoya to Schott
specifications. Such was the case with Rollei
Singapore: I suspect that all of the optical
glasses used there came from Oriental sources,
primarily Hoya, with a few other glassworks,
working to Schott specifications, included as well.
I am uncertain why you added the piece on the
production of lenses at Braunschweig. No one on
this List has denied that Rollei makes lenses and
that it has done so since at least 1973. Any
lens marked "Carl Zeiss HFT Germany" is a
Rolleiflex product made in Braunschweig, under
license from Zeiss at Oberkochen.
One of the reasons that Zeiss has restricted
production of the exotics to Oberkochen is the
need for exotic glasses in these exotic lenses,
and those are all supplied by Schott-Mainz.
Marc
msmall@xxxxxxxxxxxx
Cha robh bàs fir gun ghràs fir!
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