数码相机的镜头由多片镜片组成，材质则分为玻璃与塑料两类。
调制传递函数是评价红外光学镜头性能的最基本的技术指标之一。
The modulation transfer function(MTF) is one of the fundamental parameters to evaluate the infrared optical lens.
然而，通过观看宇航员在月球上的连续镜头，并研究宇航员自己的想法，卡尔博士重新检查了阿波罗计划使用的宇航服的性能。
Dr Carr, however, has been reviewing the performance of the Apollo suits by looking at footage shot on the moon and by studying the astronauts' own thoughts.
如今，一种新的设计再次提升了这种曲面摄像头的性能：通过改变镜头和传感器的形状带来3.5倍的光学变焦。
Now a new design gives this curved camera a boost: the shape of the lens and of its sensor can be changed in synchrony, providing a 3.5x zoom.
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