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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
G02B15/145—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 having five groups only
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FR678223D1929-07-101929-07-10Objectif photographique de redressement, de rapprochement ou d'éloignement de l'image, sans déplacement de l'appareil
ExpiredFR678223A
(fr)