The whole optical system using the materials of Ge and si consisted of 11 elements, including 3 lenses for collimator and 7 lenses for the projection system.
整个光学系统采用锗和硅两种材料,包含11片透镜,其中:准直物镜3片,投影镜头7片,场镜1片。
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Theoretical part: Classics such as: "The Liuhe classic", "Nine thesis", "7 fists and 14 parts - usage methods", "Neigong Si Jing", "Xi Sui Jing", "Yi Jin Jing", "Quanshu Yun Yi" and others.