long-focal length lens 长焦距物镜
long focal length camera lens 长焦距照相镜头 ; 长焦距摄影镜头
At present, some difficulties are encountered in measurement of long focal length of lens.
目前，透镜长焦距的有效测量还存在一些难题。
In that case, Fourier transform system with long focal length and high power lens and method of linear decision are proposed.
以肺癌细胞筛选为例，提出用长焦距、高倍率的傅里叶变换系统和线性判别处理。
Focal length is the important optical parameter of optical lens. It is valuable that methods based on Talbot effect and Moire technique are applied for measuring the long focal of lens.
焦距是透镜最重要的光学参数，应用泰伯—莫尔法测量长焦距透镜焦距具有重要的实践价值。
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