焦距

The experimental results show that the precision of focal length and principal point is up to 0.1 pixel and the stardard deviation bar length is 0.046 mm.

标定实验表明，焦距和主点求解精度达到了0.1 pixel。对比测量实验表明，对长为750.607 mm的刚性杆进行长度测量，标准差达到了0.046 mm。

The hip pop raper woke up everyone and started follow and enjoy the rhythm of his music!!!

嘻哈饶舌歌手唤醒了大家的焦距跟著他享受音乐的节奏吧！！！

Reflector telescope relative a larger diameter can be done, the main focus of the relative telescope diameter is about 15-125, even greater, Wang DC, inter Newton Telescope, the tube is longer than the system is much shorter focal length, coupled with the main mirror is only one apparent need for processing, which greatly reduces cost and manufacturing difficulties, there is currently greater than 134 meters diameter optical telescopes are all reflecting telescope.

反射望远镜的相对口径可以做得较大，主焦点式反射望远镜的相对口径约为15—125，甚至更大，而且除牛顿望DC远镜外，镜筒的长度比系统的焦距要短得多，加上主镜只有一个表面需要加工，这就大大降低了造价和制造的困难，因此目前口径大于134米的光学望远镜全部是反射望远镜。

The prototype of SGT is successfully developed for the demand of high accuracy and high speed of Attitude and Orbit Control System of the SST. The prototype images by a refracting telescope with optical aperture, focal length and field of view 60mm, 810mm and 1°×1°, respectively.

针对SST姿态控制系统高速高精度的导行要求成功研制了太阳导行镜样机，该样机采用折射望远镜成像，光学口径60mm，焦距810mm，视场1°×1°。

A design example of a lens whose operating wavelength is 0.4～0.9μm,focal length is 400 mm,full field-of-view angle is 6.2°and relative aperture is 1:4 is given on the basis of the theoretical calculation and the optimization of optical design software ZEMAX.

通过理论计算和ZEMAX光学设计软件的优化，给出工作波长范围在0.4～0.9μm、焦距为400mm、视场角为6.2°、相对孔径为1∶4的设计实例。设计结果表明，二级光谱得到了很好的校正，像质优良。

An image processing system computes the size of the reticle image and the focal length.

图像处理系统将计算十字线的像的尺寸和焦距。

This is where the name comes from, containig the German word for sun, 'Sonne', the symbol of utmost brightness.

Sonnar型镜头的小尺寸和较短的后焦距对新型35mm系统相机的进一步发展是非常重要的因素。

Over time, all conditions will be ripe and the ideal of a Speakers' Corner will be realised as naturally as a ditch is formed when water flows along.

另一方面，政府也可全面作出配合，逐步放宽言论自由的尺度，让国民和周围邻居们，有时间调整思维方式和视线之焦距，假以时日，象征自由论坛的演说角落的设立，将是水到渠成之事。

Radius variation of image beam waist due to spherical aberration, which varies with the position of objective beam waist, and optical system focus is analyzed with the form of curve. At last,a design example of optical system used for laser plume attenuation testing system is given to illustrate the effect of spherical aberration on the image beam waist.

本文还提出了在设计过程中存在的球差对激光束像方束腰的影响，对其进行了理论分析，并给出了数学模型，总结出高斯光束的像方束腰半径与物方束腰位置、光学系统焦距之间的关系，并对本光学系统的设计进行了验算。

In this paper the aberrations of a sort of sphere lens with spherical Symmetrical gradient index have ben analysied.

本文分析了一种折射率为球对称梯度分布的球形透镜的像差，得到了该透镜对无限远物点的纵、横向球基及其焦距的精确表达式。

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。