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A highly corrected three-mirror telescope has been designed for space application. It is free of spherical aberration, coma, astigmatism and field curvature. The rms-spot size within a 40 arc min field is equal to or better than .025 arc sec. The full field cannot be utilized in its entireness. A number of subfields for different instruments can be folded out radially.
Dietrich Korsch (Mon,) studied this question.