Talk:Franz Staeble
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Staeble, Franz ?? (1906) Über eine genäherte Bestimmung der Brennweiten aus den focalen Schnittweiten und aus der Luft reduzierten Länge des Systems .
Staeble, Franz (XXXX) Bestimmung der Brennpunkte und Hauptpunkte aus den Anfangsund Endwerten usw. axialer ...
Staeble, Franz (XXXX) Über eine Differenzenformel zur Sinus- und Isoplanasiebedingung mit Bemerkungen zur Seidelschen Theorie. --Heritagefutures (talk) 03:03, 10 December 2012 (PST)
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Married to 'Lisi' Staeble (Pohlmann, Ulrich (1995) Frank Eugene, the dream of beauty. Nazraeli Press. p 146) --Heritagefutures (talk) 03:03, 10 December 2012 (PST)
Chase up leads re 1929
In 1930 Staeble sold the Imagon design to Rodenstock. It is asserted this was necessary because Staeble ran into financial difficulties following the 1929 stock market crash and could not produce the lens as required.[1]
what else was caused by the 1929 crash? did Staeble sell all of his patents or the entire lens works?--Heritagefutures (talk) 09:47, 10 December 2012 (PST)
See here for invention by Staeble, but patent granted to Rodenstock:
Vorrichtung zur Bestimmung der richtigen Einstellentfernung und notwendigen Abblendung optischer Instrumente hinsichtlich der Tiefenschärfe. Inventor Dr. Franz Staeble. Applicant Rosenstock Optik GmbH. Filed 7 March 1929, granted 27 April 1931. German Patent DE523739 ©
