Vs: [Leica] Leitz Multiple coating

["Raimo Korhonen" <raimo.korhonen@pp2.inet.fi>]

My conclusions: 1) no multicoatings in Leitz lenses up to that point (except maybe some experimental lenses/elements), 2) there is some truth the claim that high refractive-index glasses do not benefit much from multicoating but there is also an indefinable amount of "sour grapes" in this "zero defect" design principle - or have Leitz reached the absolute zero?
All the best!
Raimo
photos at http://personal.inet.fi/private/raimo.korhonen

- -----Alkuperäinen viesti-----
Lähettäjä: Bill Barton <wbill@bellatlantic.net>
Vastaanottaja: leica-users@mejac.palo-alto.ca.us <leica-users@mejac.palo-alto.ca.us>
Päivä: 20. elokuuta 2000 17:54
Aihe: [Leica] Leitz Multiple coating


>Hi all, I went back thru my lit. collection and found a very small hand out
>from about 1971/72 from E.Leitz Inc. NJ. They came out with this when Pentax
>was doing alot of advertising about the just introduced "Multi-Coating"
>
>The folder was listed as "How to succeed in Photograpy Without Multiple
>Coating"
>
>"There's a current trend of thought and advertising that claims the multiple
>coating of a camera lens is just about the best thing that's come down the
>pike in recent times. Because Leitz technology takes a different approach to
>the manufacture of precision lenses - one that does not require multiple
>coating. We thought it would be helpful to discuss the two technologies as
>Leitz sees them.
>
>1.Increased image contrast and color saturation.
>2.Increased light transmission, and along with that uniform color
>transmission over the entire spectrum.
>3.Minimizing or elimination of flare,"starlight" reflections, ghosts, and
>UVa light problems.
>4.Scratch resistance due to unique hardness of the coatings.
>
>All of these features are necessary in a good camera lens. Leitz technology
>starts earlier in the process by creating "zero-defect" lenses with inherent
>properties that maximize light utilization rather than applying external
>remedies after manufacture. In other words, the Leitz approach is to "design
>out" the problem rather than correct it later. Multiple coating of lenses is
>certainly well within the Leitz technology- as yet that haven't chosen to
>build lenses that require this remedy.
>
>Reference:
>Prof. G. Franke: The Development of Modern Photographic Lenses.
>Photo-Technik und Wirtschaft. Jahrgang 22 (1971), Heft 11."
>
>Needless to say I think they got alot of flak about this handout and I do
>not recall seeing anything else about it....
>
>The little handout does not have a date on it or a code number....
>
>wbill 
>