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1·The second version also has wider and deeper knurling on the focusing ring than the previous version.

第二版调焦环上的棱比前一版更宽更深。

2·With the structure, the focusing ring can be quickly clamped on the optical mode lens; and assembly and disassembly are convenient and positioning is accurate.

由于本实用新型采用了上述结构，调焦环可快速地卡装在光模镜头上，拆装方便、定位准确。

3·We investigate the dependence of the focusing contribution on the order m of local ring of underlying traditional Fresnel zone plate.

在本文中，我们讨论了聚焦贡献对潜在的传统菲涅耳波带片上的环的阶次的依赖性。