[rollei_list] Re: Fw: Re: Re: 'Old' Zeiss glass question
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Fri, 28 Apr 2006 18:02:29 -0700
----- Original Message -----
From: "Marc James Small" <msmall@xxxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Friday, April 28, 2006 1:01 PM
Subject: [rollei_list] Re: Fw: Re: Re: 'Old' Zeiss glass
question
At 12:47 PM 4/28/06 -0500, Peter J Nebergall wrote:
-NOT exactly what I meant. Was the uncoated Sonnar 50mm
1.5 produced
alongisde the coated one? Were the Rollei Tessars produced
concurrently,
or does the1 replace the other?
PJN
This begs a question: If Zeiss was producing coated lenses
since 1937,
were they simultaneously continuing uncoated lenses in the
same formulae?
I have 2 Contax Sonnar f1.5s and 2 more f2s... 1 of each
is coated.
When did they stop making uncoated lenses?
Almost all Zeiss lens production was uncoated through the
War and some
afterwards. By 1950 or so, almost all photographic lenses
were coated
though uncoated lenses could be purchased for special uses
such as
surveillance work. Prewar production was of only a few
lenses per batch
and was done for testing purposes in the marketplace and at
least some of
these lenses were sold in the US. Coated camera lenses made
during the War
were sold in Sweden and Switzerland and Spain and Portugal,
these being the
only nations with whom Germany was still able to trade!
So, yes, uncoated and coated lens production continued in
parallel.
Marc
Why would an uncoated lens be desirable for surveillance
work?
In the US Kodak and Bausch & Lomb had been hard coating
military lenses from sometime in the mid 1940s. These were
vacuum deposited, baked, hard coatings. Both companies and
Wollensak began to offer hard coated lenses commercially
about 1946. Other manuacturers were slower to adopt coating.
Goerz evidently had to farm out their coating work so many
of its lenses continued to be sold without coating or one
could get a coated version if one was willing to wait. I am
not sure when Ilex began to coat lenes but I think early on.
Ilex and Wollensak built tremendous numbers of lenses on an
OEM basis.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
---
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