另一种是一个线型波带板和一个圆型波带板的组合，效果相当于一个凸透镜和一个柱面透镜的组合。

It ACTS as a two-cylindrical lens system. The other is prepared by overlapping a line-type zone plate and a circular zone plate.

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另一种是一个线型波带板和一个圆型波带板的组合，效果相当于一个凸透镜和一个柱面透镜的组合。

One is prepared by overlapping two line-type zone plates. It acts as a two-cylindrical lens system.

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