Walter Watz

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The 35mm f/1.4 Aspherical Summilux-M " . . . in its two versions designed by Walter Watz ( the first one produced between 1990-1994 with 9 elements in five groups and two aspherically ground lenses and the second one produced from 1994 featuring the same optical formula but only one aspherical surface produced by ultra high precision press forming rather than by grinding and polishing, i.e, moulding raw glass blanks for the first time) . . ."

Source - José Manuel Serrano Esparza

Leica Camera GmbH Photographic Patents by Walter Watz of Huettenberg-Reiskirchen, Germany