1.
autofocus zoom lens
自动聚焦变焦距镜头
2.
auto iris zoom lens
自动光圈变焦距镜头
3.
manual zoom lens
(镜头)手控可变焦距透镜
4.
long focus lens
长焦距（望远）镜头
5.
variable focal length (cylindrical) lens
变焦(距)(圆柱)透镜
6.
For different focus lenses,we realize auto-measuring by focusing.
对于不同焦距的镜头，采用对焦的方法实现自动测量。
7.
Focal length: The distance between the centre of a lens and its principal focus.
焦距:镜头中心与其主焦点的距离。
8.
Auto-focus: The automatic adjustment of the lens distance to give a sharp image on the film.
自动对焦:自动调节镜头的距离，使菲林得到清晰的影像。
9.
Don't forget to focus the lens.
别忘了调节镜头的焦距。
10.
the ratio of the focal length to the diameter of a (camera) lens system.
相机镜头直径焦距比。
11.
This is a long focus lens.
这是个长焦距镜头。
12.
macro teleconverter
增距式微距附加镜﹝使标准镜头变成微距而保留最近封焦距离﹞
13.
(physiology) the automatic adjustment in focal length of the lens of the eye.
（生理学）用眼的透镜来自动调节焦距。
14.
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快速变焦距手术显微镜
15.
rear-controlled zoom lens
背面调整变焦距透镜
16.
best image plane of zoom lens
变焦距物镜的最佳像面
17.
image plane displacement of zoom lens
变焦距物镜像面位移
18.
zoom stereomicroscope
快速变焦距立体显微镜