锗片是制作半导体器件，红外光学器件的材料。主要成分为锗。
借助于二元光学器件的独特性质，系统在仅使用两片锗透镜的情况下得到了接近衍射极限的光学质量。
The designed system benefits from the specialities of binary optical elements and approaches diffraction limitation by use of only two germanium lenses.
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。
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.
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