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Publication of FR719654ApublicationCriticalpatent/FR719654A/fr
G02B13/00—Optical objectives specially designed for the purposes specified below
G02B13/20—Soft-focus objectives
Landscapes
Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
Optics & Photonics
(AREA)
FR719654D1931-07-061931-07-06Perfectionnements aux lentilles pour appareils photographiques et cinématographiques et aux dispositifs optiques
ExpiredFR719654A
(fr)