Proceedings Paper • newMonochromatic quartet explained
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A solution to the Monochromatic Quartet problem posed at the 1990 International Lens Design Conference 1 is explained in terms of its origins and influences from several photographic and micro lithographic lens designs. Simple considerations are given for the selection of a starting point for local optimization which improve the chances of finding the global optimum.
While it cannot be claimed that this Quartet solution is a practical one, the problem did not require it to be so. It does, however, illustrate several important features of real lenses, and is shown to lie in performance between photographic and microlithographic lenses. The problem specifically excluded catadioptric designs, but a solution that ignores this rule is shown to give a significantly better minimum, illustrating that even the global optimum is local to the space defined by a given set of constraints.