[rollei_list] Re: : features of Medalist
- From: Marc James Small <marcsmall@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx,<rollei_list@xxxxxxxxxxxxx>
- Date: Wed, 06 Jun 2007 21:06:09 -0400
At 07:57 PM 6/6/2007, Richard Knoppow wrote:
>
> Thats correct, the L mark and "Luminized" trade name is
>for the vacuum hard coating. I don't know the exact date
>when this coating was applied to Kodak consumer lenses but
>it was probably sometime around 1946 or 47. This is about
>the time that other manufacturers began hard coating their
>consumer lenses. Some used trade names, for instance,
>Wollensak used "Wocoating" with a W in a C as the symbol,
>Schneider used a triangle, white at first, then red, Zeiss
>marked thiers with a T. But many manufacturers did not mark
>coated lenses. I think B&L used a color dot but they used
>dots for other things as well. Kodak, Wollensak, and B&L
>evidently had in-house coating facilities, all three were
>involved with the development of vacuum coating during the
>war. Other makers, Goerz for instance, evidently farmed out
>coating. Goerz was one of the last companies to coat
>routinely.
> I don't know about British made lenses. The Brits
>certainly had the technology but the English economy was so
>depressed after the war that busineses were very slow to
>adopt new technology.
Richard
We've had some discussions about this over on the IDCC over the years.
Zeiss in Germany, Kodak and Wollensak, and Ross
in the UK all developed vacuum coating methods in
the late 1930's, though only Zeiss regularly
marketed coated lenses. There are a few Prewar
Lumenized lenses, and much of the military gear
made by Wollensak -- they largest product line
was rangefinders and gunsights -- was coated
during the War. Ross licensed the product to
Barr & Stroud, then the primary supplier of
binoculars and gunsights and periscopes to the British military.
Zeiss published the details of their process in
late 1940, so it then became available to any optical house wishing to use it.
I agree that regular production of Lumenized
lenses did not begin until 1946 or '47.
Marc
msmall@xxxxxxxxxxxx
Cha robh bàs fir gun ghràs fir!
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