Amon M, Rosin S, Jackson B
Appl Opt. 1971 Mar 1;10(3):490-3. doi: 10.1364/AO.10.000490.
A relatively large (23-cm) aperture system working at f/1.5 has been designed for low-light-level application. A catadioptric system, utilizing only spherical surfaces as described by M. Shenker, serves as a starting point. It consists of three large correctors in front of the primary, and a single element located near the focal plane. All elements are made of BK-7 glass. The system presented incorporates one of the large corrector elements with the primary to form a Mangin mirror, and the secondary has been made coincident with the rear surface of the second element. A different glass has been selected for this objective, yielding a system with improved performance, greater rigidity, and higher transmittance. The optical evaluation, thermal properties, and mechanical mounting are reported with a comparison of the theoretical and actual performance.
已设计出一种相对较大（23厘米）孔径的系统，其工作光圈为f/1.5，用于低光照水平应用。以M. 申克所描述的仅使用球面的折反射系统作为起点。它由位于主镜前方的三个大型校正镜以及位于焦平面附近的一个单透镜组成。所有元件均由BK-7玻璃制成。所展示的系统将其中一个大型校正镜元件与主镜合并形成一个曼金镜，并且副镜与第二个元件的后表面重合。为此目的选择了一种不同的玻璃，从而得到一个性能有所改进、刚性更强且透射率更高的系统。报告了光学评估、热性能和机械安装情况，并对理论性能和实际性能进行了比较。
