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A method is developed for the design of an aspheric surface to ensure axial stigmatism in any given centred optical system. It is shown that when the surface is in the interior of the system the determination of its profile depends on the solution of a certain transcendental equation. An iterative method is described which gives the profile to any desired degree of accuracy. When the corrector is the last surface of the system the solution is greatly simplified and for such cases exact parametric equations, involving quantities which can easily be obtained from a ray trace, are given.
Ervin Wolf (Wed,) studied this question.
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