parfocal objective是什么意思

用法例句

The study of hybrid refractive-diffractive telephoto lens;

折衍混合在长焦物镜中的应用研究

In order not to change the template time and again and reduce the influence to ensure the continuity and the reliability,a zoom lens was designed with the software of ZEMAX based on the zoom lens theory and was introduced to the machining system inste.

为了研究在准分子激光刻蚀聚合物的过程中避免经常往复更换不同大小而形状相同的掩模的实验操作,保证实验的连续性和结果的真实性和可靠性,在实验的加工系统中基于变焦距系统的原理采用引入一个变焦物镜代替原来系统中普通物镜的方法,取得了一个准分子激光刻蚀可变焦光路系统。