Shafer D R
Appl Opt. 1978 Apr 1;17(7):1072-4. doi: 10.1364/AO.17.001072.
A variety of four-mirror telescopes are described, all corrected for spherical aberration, coma, and astigmatism; all unobscured; and all with spherical surfaces. Performance is discussed with an afocal beam expander and a flat-field telescope as typical design examples.
介绍了多种四镜望远镜,它们均针对球差、彗差和像散进行了校正;均无遮拦;且镜面均为球面。以无焦扩束器和平场望远镜作为典型设计实例讨论了其性能。