A simple algorithm for calculating three-mirror telescopes with all conic surfaces free of spherical aberration, coma, astigmatism, and field curvature is proposed. The algorithm is based on the theory of aberrations of the third order. The initial parameters are the effective focal length, mirror diameters, and system length. The result is a design with a flat field of view with a diameter of more than 1° at sub-arcsecond image quality, which is close to the theoretically best. If necessary, the latter is achieved through slight optimization.

中文翻译：

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计算像散三镜望远镜的算法

提出了一种计算所有圆锥面都没有球面像差、彗差、像散和场曲的三镜望远镜的简单算法。该算法基于三阶像差理论。初始参数是有效焦距、反射镜直径和系统长度。结果是在亚弧秒图像质量下具有直径超过 1° 的平坦视场设计，这接近于理论上的最佳水平。如有必要，后者通过轻微优化来实现。