This compact, easy-to-carry lens is ideal for photo enthusiasts looking to add a bright, general purpose zoom to their collection of full-frame optics.
这个小巧，易于携带摄影镜头是寻求增加明亮，通用放大他们的全画幅光学收集爱好者的理想选择。
2
In contrast with zoom system, the simple optics systems meet the requirements of low cost and high feasibility.
在满足设计指标的前提下，和变焦系统相比，该光学系统结构简单、成本低、可行性高。
3
To apply theory of dynamic optics, it indicates the moving curve resolution type of the zoom group versus the compensating group.