焦距

AW: In general terms in the design of a lens the size of the lens can be minimized when the focal length and back focus distance are roughly equal.

伍尔兹：从总体上看在设计镜头大小的镜头时，可以减少焦距和背部重点距离大致相等。

The influences of pump energy,focal length and distance between fiber and lens on SBS reflectivity and waveform in multimode fiber are investigated theoretically and experimentally.

从理论和实验上研究了不同焦距下泵浦能量以及透镜与光纤间距对多模光纤中的SBS能量反射率和脉冲波形的影响。

Could the slight differences in focal distance created by corneal irregularities actually aid the eye in seeing a variety of light frequencies?

角膜的不规则缺陷导致的焦距差异，搞不好反而协助眼睛看见许多不同的光频。

These are called vertex focal distance because they are measured from the vertex of the lens surface to the lens focal point, The focal powers corresponding to them are the back and front vertex powers.

13从透镜的表面到焦点的距离被称为顶点焦距，是以透镜的前后顶点为起点测量的。与之相对应的屈光度称为前后顶点焦度。

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。

Stability of resonator with thermal lensing inside is discussed by optical transmission matrix. The fluctuation range of thermal focal distance affects the laser power and the beam quality.

运用光学传输矩阵的分析方法对内含热透镜元件谐振腔的稳定性进行了分析，讨论了热焦距的波动性对激光输出功率和光束质量的影响，提出了固体激光器谐振腔设计的基本原则。

The photographs move from a position of public distance and through focal length adjustments allow for private scenes and stories to brought to light, teeming with ambiguity and manifold questions.

作品中的私密场景掌握在公共距离的许可下，却又因镜头焦距的调节而情节暧昧、滋生疑问重重。

Ohio State University, according to visual determination of the clinical professor Gregory Goode introduction, if your prescription is very simple, is not required at the same time to correct hyperopia and myopia dual optical lens, or does not require correction with a close-up, respectively, visual, medium-range vision and distance vision three focal length lens, you can with a pair of cheap glasses.

俄亥俄州立大学，根据临床教授格雷戈里古德介绍视觉的决心，如果你的处方很简单，不需要在同一时间，以纠正近视和远视的双重光学镜头，或者不需要的特写镜头校正，分别，视觉，中程的远见和远视力3焦距镜头，你可以用廉价眼镜。

When wide angle views go to extremes and beg the control via an SLR viewfinder, which means that the back focal distance has to be much larger than the focal length, a retrofous design called Distagon is the right choice.

除了具备广角的条件之外，Distagon镜头允许单眼反光机的反光镜在最后一个镜片和呈像平面之间的空间移动，这个距离在广角镜的焦距中是非常长的。

They had a 30 1.4 but I was not sure I liked the focal length.

他们有一个适马30 F1.4的，但我不知道是否喜欢这个焦距。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。