Sigler R D
Appl Opt. 1982 Aug 1;21(15):2804-8. doi: 10.1364/AO.21.002804.
A well-corrected telescope with a large spherical primary mirror can be realized by using three or four small, widely spaced, corrector lenses. An interesting solution uses the lenses in a relay configuration which results in an erect image, accessible real exit pupil, and an internal field stop. Lateral color is corrected by adding a field lens at an intermediate focus. Polychromatic axial correction is excellent despite use of only one type of glass. The useful field of view is typically limited to 1 deg. Examples are presented.
通过使用三个或四个小的、间隔较宽的校正透镜，可以实现具有大球面主镜且校正良好的望远镜。一种有趣的解决方案是将透镜以中继配置使用，这会产生正立图像、可及的实际出射光瞳和内部视场光阑。通过在中间焦点处添加一个场镜来校正横向色差。尽管仅使用一种类型的玻璃，但多色轴向校正效果极佳。有用视场通常限制在1度。文中给出了示例。
