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Three-mirror anastigmats were proposed in 1935 by Paul.
Such systems are called anastigmats.
There are also a small number of off-axis unobstructed all-reflecting Anastigmats which give optically perfect images.
Double-meniscus anastigmats use widely separated positive and negative surfaces, generally thick meniscus lenses, to achieve a flat field.
Goerz' Double Anastigmats, etc.