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| " . . . Leica always had the obtainment of the best possible optical glasses for its M lenses as one aim of paramount importance, and the examples are manifold: the thorium oxide glass nD= 1,69112 vD= 54, 8 included in four of the lenses of the optical formula of the Leitz Summitar* [[Summicron (I) f= 5 cm 1:2]] Original Project 1950 designed by [[Gustav Kleinberg]] and [[Otto Zimmermann]] (which also had a flint lead-glass plate to avoid film fogging by radiation) . . ." '''Source''' - [http://elrectanguloenlamano.blogspot.com/2008_06_01_archive.html José Manuel Serrano Esparza]
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| *They also designed the [[Summitar f= 5 cm 1:2]] - [http://www.marcocavina.com/articoli_fotografici/50mm_Leica_a_telemetro/00_pag.htm Mario Cavina]
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| === E. Leitz Photographic Patents by Otto Zimermann ===
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| *1950 JUL 20 - PHOTOGRAPHIC OBJECTIVE LENS SYSTEM (8 / 6) with [[Gustav Kleinberg]] see [[Summicron (I) f= 5 cm 1:2]]
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Latest revision as of 13:18, 3 June 2012
