ZOOM LENS MOUNT ASSEMBLY WITH MEANS FOR CLOSE-UP FOCUSING

A zoom lens assembly includes a focusing lens system, a magnification varying lens system consisting of two movable lens groups, and an image forming lens system. Movement of an operating ring in the assembly simultaneously moves the two movable lens groups according to a predetermined relationship....

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Bibliographische Detailangaben
Hauptverfasser:	NOZAWA H,JA, IIDA Y,JA
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORIES THEREFOR APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHOTOGRAPHY PHYSICS
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Beschreibung
Zusammenfassung:	A zoom lens assembly includes a focusing lens system, a magnification varying lens system consisting of two movable lens groups, and an image forming lens system. Movement of an operating ring in the assembly simultaneously moves the two movable lens groups according to a predetermined relationship. The operating ring also adjusts the distance between the two movable lens groups so that the simultaneous movement according to the predetermined relationship effects a zooming action or achieves focusing for ultra-short distances.