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    Characterization of the panoramic annular lens

    The panoramic annular lens (PAL) consists of a single piece of glass, with spherical surfaces, that produces a flat annular image of the entire 360-deg surround of the optical axis of the lens. This paper desc...

    D. L. Lehner, A. G. Richter, D. R. Matthys, J. A. Gilbert in Experimental Mechanics (1996)