A theoretical amendment and interity on the method of ultrafocuses;
超焦距对焦法的理论修正和完善
This essay gives a detailed mathematical proof of the traits of the depth of the field and ultrafocuses,the factors affecting the depth of the field that is directly showed in other photographic articles.
对现有摄影文献直接给出的景深及超焦距的特点和影响景深的因素作出了详细的数学证明 ,进一步探讨了这些结论在摄影技术中的实际意义 ,使得景深理论更为充实和完
The formulas of field depth and hyperfocal distance once appeared in bibilography, but the physical concept as starting point for inference of the formulas is not so clear that it is hard for the others to understand.
景深和超焦距公式曾在文献中出现过，但推导公式出发点的物理意义不明确， 难以服人。
Precision measuring system of focus to aerial cameras with CCD;
航空相机焦距CCD精密测量系统
New focus measuring method of camera zoom lens;
一种摄像机变焦镜头焦距测量的新方法
This article introduces the theory and design methods of a zoom lens controller for zooming focus,focussing,and focus feedback in the incorporate zoom lens CCD camera based on 89C2051 microchip and MAX187 A/D switch.
本文介绍了可变焦一体化CCD摄像机中的一种基于89C2051单片机和MAX187 A/D转换器的变焦镜头控制器进行变焦和聚焦控制,以及焦距反馈的原理及实现方法。
Having three focal lengths.
三焦距的有三个焦距的
equivalent focal length
当量焦距，等效焦距
Focus-to-film distance(f.f.d)
焦点-胶片距离(焦距)
autofocus zoom lens
自动聚焦变焦距镜头
long focus lens
长焦距（望远）镜头
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。
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快速变焦距手术显微镜
Only a bit out of focus.
只是焦距有点不对。
One must focus the camera before taking a picture.
拍照之前先要对焦距。
The image is out of focus.
这影像的焦距没调好。
Don't forget to focus the lens.
别忘了调节镜头的焦距。
rear-controlled zoom lens
背面调整变焦距透镜
best image plane of zoom lens
变焦距物镜的最佳像面
image plane displacement of zoom lens
变焦距物镜像面位移
manual zoom lens
(镜头)手控可变焦距透镜
He focused the camera and took a photo.
他对好焦距，照了一张相。
Eyeglasses having trifocal lenses.
有三焦距镜片的眼镜
the ratio of the focal length to the diameter of a (camera) lens system.
相机镜头直径焦距比。