1.
auto iris zoom lens
自动光圈变焦距镜头
2.
autofocus zoom lens
自动聚焦变焦距镜头
3.
manual zoom lens
(镜头)手控可变焦距透镜
4.
back focal distance
【光】后焦距﹝指镜头与菲林间的距离﹞
5.
F-number: The figures marked on the lens collar to indicate the size of the lens aperture in relation to its focal length.It is the ratio of the aperture diameter to the focal length of the lens.
光圈值:刻划在镜头上用来表示镜头孔径与焦距关系的比值。经过选择的数字成一系列。
6.
Experimental Study on Measuring the Focal Length of Lens Automatically on the Optical Bench;
光具座实现透镜焦距自动测量的实验研究
7.
long focus lens
长焦距（望远）镜头
8.
When you use a small aperture (large number aperture setting) with a lens such as a zoom lens, half of the split image becomes dark. In this case, use the matte screen to focus.
当您使用变焦镜头并选用小光圈（大光圈数值）时,分裂像一半是黑的,这时可用磨砂屏对焦。
9.
mechanical compensation
【光】机械式补偿法﹝变焦镜头的变焦法之一，其移动镜片作独立式补偿﹞
10.
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。
11.
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。
12.
optical compensation
【光】光学式补偿变焦法﹝变焦镜头的变焦法之一，所有移动镜片均作相对式补偿方法﹞
13.
variable focal length (cylindrical) lens
变焦(距)(圆柱)透镜
14.
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﹞
15.
The camera adjusts its focus, lens aperture, and shutter speed by itself.
照相机会自己调整焦距、光圈和光闸速度。
16.
(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。
17.
The Study of Zoom Telephoto Lens and Single Lens Reflex;
长焦连续变倍单镜头反光照相镜头技术研究
18.
Don't forget to focus the lens.
别忘了调节镜头的焦距。