[rollei_list] Re: Rollei 35S, SE

  • From: "Eric Goldstein" <egoldste@xxxxxxxxx>
  • To: rollei_list@xxxxxxxxxxxxx
  • Date: Wed, 3 Oct 2007 08:58:49 -0400

Ok, that would make it of the Opic/Xenon type which was roughly of the
same vintage, the design which was refined to become the basis of just
about every "normal" f/1.8-2 lens in 35 mm photography...


Eric Goldstein



On 10/3/07, Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:

>      The diagram in the Kodak lens booklet shows a six
> element conventional Biotar or Opic type. I can't find this
> lens in LensView but I may be able to find something in a
> Google patent search. The earliest Kodak Biotar in LensView
> is a patent applied for in 1937 and issued in 1940, from the
> diagram its not the same lens although it is an f/2 lens. I
> don't think Kingslake shows the Bantam Special lens. I don't
> know if the earlier versions of this lens were coated but
> the 1946 printing of the 1945 edition states that the Bantam
> lens and the Medalist lens are "treated on glass air
> surfaces to reduce flare." This may be a hard coating but
> Kodak was applying soft coating to the inner surfaces of
> lenses from about 1940.
>      This is from a _Kodak Reference Handbook_ I bought at a
> sale last week-end. It has several Kodak bulletins in it,
> one of which is for _Kodak Luminized Enlarging Lenses_. If I
> read the date code on  the back right it was published 5-48.
> It shows a picture of a vacumm coating machine and a very
> brief description of coating. I am pretty sure Kodak began
> using the trade-name of "Luminized" about 1946, however, its
> not used in the booklet described above. However, there is a
> slight revision of the text from the 1945 edition: the
> lenses called Eastman Ektars (later called Kodak Commercial
> Ektars) are described as having anti-flare coatings on
> _inner_ glass-air surfaces in the older edition and simply
> as being treated for anti-flare in the later edition,
> leading me to believe that these were hard coatings even
> though the name "Luminized" was not yet applied.
>      Further, Kodak was one of the primary companies
> involved in the research into anti-reflection coating during
> WW-2. Kodak and RCA were very early developers of various
> means of lens coating going back to the early 1930's. RCA's
> interest may have been due to its interest in photographic
> sound recording. In any case, there are some early articles
> on coating in the _RCA Review_, RCA's scientific house
> organ.
>      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.
>
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
> ---
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