[rollei_list] Re: Rollei 35S, SE
- From: Marc James Small <marcsmall@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx,<rollei_list@xxxxxxxxxxxxx>
- Date: Wed, 03 Oct 2007 09:40:30 -0400
At 08:51 AM 10/3/2007, Richard Knoppow wrote:
> Zeiss had developed a method of vacuum coating about
>1935 but I don't think it was hard coating. The trick of
>baking the coating in vacuo in the coating machine was
>developed during WW-2 as part of the Signal Corps research.
You folks just won't let up, will you?
Hard-coating technologies were independently
developed by Alexander Smakula, at Zeiss, by Ross
in the UK, and by Wollensak and Kodak in the US
prior to the outbreak of the Second World
War. All of these companies were marketing
coated lens by 1937, though with varying degrees
of publicity: Wollensak, for instance, was
selling coated optics to the US Army and this was
not publicized; Zeiss did not publicize its lens
coatings but just started marking its coated
lenses with the epic red "T" from 1937 onwards.
Leitz and others adopted soft coatings to avoid
interference with the Zeiss patent, which did not expire until 1960.
Marc
msmall@xxxxxxxxxxxx
Cha robh bàs fir gun ghràs fir!
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