[rollei_list] Re: Lens recommendation
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Mon, 9 Aug 2010 13:48:50 -0700
----- Original Message -----
From: "Don Williams" <dwilli10@xxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Monday, August 09, 2010 1:11 PM
Subject: [rollei_list] Re: Lens recommendation
At 02:49 PM 8/9/2010, Marc and Richard wrote, more or
less:
To confuse the issue, the term "component" is rarely
encountered.
I have a somewhat related question. In the olden days
there was a
company named "Schott". They supplied a wide variety of
glass, for
lenses and, I think, for labware and glass tubing.
Now I notice that the glass top of the stove that came
with this
house says "Schott- Ceran".
Same company?
DAW
Still in business AFAIK, Schott u. Gneissen. At one time
Abbe and Schott. This is the company that developed the
first barium glasses that made anastigmat lenses possible. I
don't know its current ownership but it was part of the
Zeiss combine for a long time and may still be.
For a couple of decades after Schott developed the
barium glasses the method of producing them remained a
Schott proprietary secret. This was broken during WW-1 when
the US government made a concerted effort to develop an
optical glass industry in the US. Bausch & Lomb had already
begun a small optical glass plant but the pressures of war
time resulted in the rapid development of a large industry
in the US and the production of advanced glass types equal
to the German glass.
--
Richard Knoppow
Los Angeles
WB6KBL
dickburk@xxxxxxxxxxxxx
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