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A new form of field corrector for astronomical telescopes with paraboloidal primary mirrors is described. It consists of four separated spherical surfaced lenses and gives improved aberration correction. The method of designing is described, and the adaptability of the design to telescopes of different characteristics is discussed. Numerical data and details of performance are given for a specific design for the Palomar Observatory 200-in. (5.08-m) telescope.
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C. G. Wynne (1967) studied this question.
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