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Publication of FR2255620A1publicationCriticalpatent/FR2255620A1/fr
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Publication of FR2255620B1publicationCriticalpatent/FR2255620B1/fr
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
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Physics & Mathematics
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General Physics & Mathematics
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Optics & Photonics
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Lenses
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Picture Signal Circuits
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FR7441822A1973-12-201974-12-18Variable focus lens for TV cameras - gives uniform high contrast over whole image field even at extreme edges
GrantedFR2255620A1
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