用来观察物体细节的简单目视光学器件，是焦距比眼的明视距离小得多的会聚透镜。
Used to observe the details of a simple visual objects, optical devices, is the focal length than the distance between eyes, as much out of the convergence lens.
根据实验数据，使用焦距移动方法，生成长径比超过500的微碳柱。
Based on experimental data, the micro carbon pillar with an aspect ratio of over 500 was fabricated through focus moving method.
分析了几种不同的动态聚焦系统的特点，给出了激光束通过该系统的变换公式以及光杠杆比和透镜焦距的确定方法。
The several dynamic focus systems are analyzed. The transmission formulas of laser through them and the way to define the optical lever ratio and the focus of lens are given.
根据光学透镜成像原理，推导近端和远端物像与相机焦距、视角和物距的关系式及其像比，借此控制相机视图中远近两端物像的形状反差。
The relationships between images of near and far objects with camera lens and field of view and object distance and the image ratio are researched.
与传统变焦距系统相比，该变焦距结构形式较容易实现高变倍比变焦。
Compared with the traditional zoom system, this type of zoom system structure is easier to obtain high zoom ratio.
与传统变焦距系统相比，该变焦距结构形式较容易实现高变倍比变焦。
Compared with the traditional zoom system, this type of zoom system structure is easier to obtain high zoom ratio.
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