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Bociort, F. (author), Van Turnhout, M. (author), Marinescu, O.E. (author)Optimization of a projection system is performed to obtain a starting configuration that is at a local minimum of the merit function or simply a previously known minimum system is used as the starting configuration. A zero-thickness meniscus lens is inserted at a surface in the local minimum starting configuration with N surfaces to construct a...patent 2007