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焦镜

网络Zoom; focal reducer

焦镜

焦镜

Zoom

...）的欧拉拉（Oh la la）；雅得（Jade）的焦镜（Zoom）；奥托。

focal reducer

过去减焦镜(focal reducer)多见於天文望远镜之上，用途有几个，包括将望远镜焦距减缩令视角变阔、增加光度及增加清晰度， …

1

In view of the features and technical demands of mechanical unit in a zoom lens system , a closed-loop control scheme is adopted .

针对变焦镜系统的机械装置的特点和技术要求，采用闭环控制方案。

2

Look sharp to you? They were made on a 50 year old fixed-focus, fixed exposure box camera for which I paid $3 .

这些相片都是用一台 3 块美金，无法调整曝光设定的箱型相机，加上一颗已经使用过 50 年的老定焦镜所拍摄而成。

3

Temporary observation of the effect of progressive lenses for treatment of juvenile myopes

渐变多焦镜治疗青少年近视的短期观察

4

Effects of progressive addition lenses on myopic teenagers

渐进多焦镜对青少年近视发展的影响

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