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Priority to JP9571272ApriorityCriticalpatent/JPS4953821A/ja
Priority to DE19732347487prioritypatent/DE2347487C2/de
Publication of JPS4953821ApublicationCriticalpatent/JPS4953821A/ja
Priority to US05/562,036prioritypatent/US3997245A/en
G02B15/00—Optical objectives with means for varying the magnification
G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
G02B15/22—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with movable lens means specially adapted for focusing at close distances