这种变焦距物镜有两个优点，一是可以实现高倍率变焦，二是容易消除在变焦过程中产生的像点移动现象。
Firstly, the zoom ratio may be enlarged. Secondly, the image point movement may be easily eliminated. The principle of optical compensated step zoom lens is explained.
这种变焦距物镜有两个优点，一是可以实现高倍率变焦，二是容易消除在变焦过程中产生的像点移动现象。
Firstly, the zoom ratio may be enlarged. Secondly, the image point movement may be easily eliminated. The principle of optical compensated step zoom lens is explained.
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