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A multimode fiber end is conjugated by a lens with a punctual source. The punctual source emits in a given cone. The page calculates the minimum aperture diameter of the lens (so that the numerical aperture of the lens in the image space is equal to the numerical aperture of the fiber optic), the position of the fiber optic and the coupling efficiency as functions of the emission cone angle, the source position, the focal length of the lens and the numerical aperture of the fiber optic.