22B-E6P6C104

22B-E6P6C104

22B-E6P6C104

早期的镜头都只有单一的焦距，但后来聪明的工程师开始思考：如果一支镜头能有不同的焦距该多好？换句话说：如果只用一支镜头就既能拍摄近处较大的物体（比如建筑和风光），又能拍摄远处较小的物体（比如足球场上的运动员）那该多好？

科学家们研究出一种改变镜头结构的方法，因此可以改变镜头的节点靠近或远离传感器。通过这种方法，他们发明了变焦镜头。

22B-E6P6C104

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