[rollei_list] Re: was Rollei 35S, SE, lens coating
- From: Carlos Manuel Freaza <cmfreaza@xxxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Wed, 3 Oct 2007 19:57:04 -0300 (ART)
Richard, I only quote Rudolf Kingslake, after to
mention H. Dennis Taylor observations about the
tarnished lenses transmitted more light, he writes:
"The whole subject was opened up in 1936 when A.
Smakula of Zeiss invented the process of coating lens
surfaces in a vacuum with a thin evaporated layer of
low-index material.A single layer of such material,
originally calcium fluoride or magnesium fluoride, has
the effect of reducing the reflectivity greatly at one
wavelength in the middle of the spectrum, but less at
the longer or shorter wavelengths at the ends of the
spectrum..." (Rudolf Kingslake, "A history of
photographic Lens", Science 1989)
And this is from a Zeiss on-line paper:
"Coating optimization
Working at Carl Zeiss, Smakula developed
a completely new, patented
method in 1935 to minimize annoying
reflections on optical surfaces: he
added an additional coating ? which
was also very durable ? to the surface
of a lens, which had an anti-reflection
effect. Smakula?s work is the basis of
the standard procedures used to minimize
reflections today..."
http://www.zeiss.com/C125716F004E0776/0/D6BDB824254AA33CC125730800346465/$File/inno17_e_1821.pdf
All the best
Carlos
--- Richard Knoppow <dickburk@xxxxxxxxxxxxx> escribió:
>
> ----- Original Message -----
> From: "Marc James Small" <marcsmall@xxxxxxxxxxx>
> To: <rollei_list@xxxxxxxxxxxxx>
> Sent: Wednesday, October 03, 2007 12:43 PM
> Subject: [rollei_list] Re: Rollei 35S, SE
>
>
> At 02:55 PM 10/3/2007, Richard Knoppow wrote:
>
>
> > Well, there are other sources such as patent
> literature
> >and stuff published in various scientific
> journals, for
> >instance, the _Journal of the Optical Society of
> America_
> >and the afore mentioned _RCA Review_.
> > Also, history accepted by whom? Also, history
> derived
> >from the actual participants may simply mean
> anecdotal
> >evidence. Also, who do you think wrote the history
> at SVC?
>
> Richard, I am speaking of the accepted story of
> the history of lens coating as set out by a
> number of optical and commercial historians: you
> might revisit the appendix in my own 39mm
> DIVERSITY on this subject, and note the many
> references cited there. For that matter, the
> development of lens coating is covered in several
> places in the US Army's "Green Books", the
> history of the US Army in the Second World War.
>
> The dispositive account of the Zeiss development
> was published in a German technical journal in
> 1940; I can provide a full citation, though the
> journal is rather difficult to locate today and I
> do not own a copy, though I have seen one.
>
> I am sure that this Society of Vacuum Coaters is
> a nifty group, but they ignore non-US
> developments and ignore the role the US military
> played.
>
> Marc
>
>
> msmall@xxxxxxxxxxxx
> Cha robh bàs fir gun ghràs fir!
>
> What in the world are you talking about? The
> history I
> am speaking about specifically is the one published
> by the
> Frankford Arsenal in 1943. This is available on the
> SVC site
> as a PDF. There is also a general history of the
> development
> of vacuum coating of all sorts which traces the
> history of
> vacuum pumps, etc. There is also a military
> technical manual
> on how to do hard vacuum coating. Both also as
> PDF's. I
> think you are the one ignoring sources. Zeiss did
> not invent
> everything although the Germans historically
> certainly did
> not like to credit anyone else with anything.
> I may also point out that the beginnings of
> modern
> high-vacuum equipment was developed at General
> Electric and
> at Bell Laboratories in the mid-teens. Both were
> trying to
> perfect vacuum tubes. Lee DeForest did not
> understand the
> need for a really good vacuum and his Audion tubes
> had a
> very bad reputation. He sold his patents to Western
> Electric
> and General Electric. The principle investigators
> were
> Irving Langmuir at GE and Henry DeForest Arnold at
> Western
> Electric/Bell Labs. These two, working
> independantly,
> invented similar diffusion pumps to provide the kind
> of very
> high vacuum needed for vacuum tubes and for
> generating
> plasmas.
>
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
> ---
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