principal focal distance

用法例句

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。

Explanation of calibration specification for IR optical focal length measuring equipment;

红外光学系统焦距测量装置校准规范说明

The autocollimating telescope method for determination of the radius of curvature and focal length of thin lens;

用分光仪测量薄透镜曲率半径和焦距的实验研究(英文)

Further study on thin-lens focal length measurement experiment;

再议对薄透镜焦距测定的进一步研究

Comparing to see the objects with glasses,with seeing them directly will become bigger,equal or small all depends on focal distance between glasses and eyes.

戴眼镜看物体与眼睛直接看物体时相比,物体究竟变小、等大还是变大,取决于眼镜与眼睛光心之距与眼睛的焦距。

It shows that Intensity distribution depends on such parameters as focal distance,wavelength and distance between two apertures.

推导了双矩形孔傅里叶变换频谱面上的强度分布 ,得出强度分布参数 ,激光波长 ,双矩形孔矩和透镜焦距的关系 ,并借此测量了透镜焦距。

Beginning with the talk about the basic factors of TV camera shooting-shooting distance and focal distance,the paper approaches the effect of appearance of picture in order to improve the quality of camera shooting.

本文从电视摄像最基本的要素摄距和焦距入手 ,探讨画面效果 ,以提高拍摄质量 。

In this paper, a measuring method of convex lens foci in collimator is given.

介绍一种测量平行光管内凸透镜焦距的测量方法 。

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。