lenses

• This approach has been used to advantage in the design of a number of photographic lenses .
  这种方法成功地应用在一些照相镜头的设计中。
• Every lens has a mounting flange with which it is attached to the camera body .
  每个透镜都有一个安装凸缘，依靠它才能把透镜安装到相机上。
• Imagine that we have some sort of lens system which forms an image of an extended object .
  设想我们有某种透镜系统，它对一个扩展物体成象。
• Even poor lenses and uncritical eyes can always seen something on the moon .
  纵然用劣质透镜和没有鉴别力的眼睛也总能在月球上看到一些东西。
• Objectives which consist only of one lens can be used for visual and photographic observations .
  由单透镜组成的物镜可作目视和照相观测用。
• Some of the advantages of lens stereoscopes are compactness, simplicity and ready portability .
  透镜式立体镜的一些优点是坚固、简单、轻便。
• The question was open as to what shape of lens would so focus in the coming rays .
  什么形状的透镜能起这样的聚焦作用，还是一个没有解决的问题。