焦距

And much is changing in countries, in the world and in the international situation. Therefore, we all have the task of "adjusting the focus and apertures."

当前，各国的情况、世界的情况都发生了很大变化，所以我们大家都存在着如何&调焦距、对光圈&这样一个任务。

Research on uncalibrated self-adaptive 3D reconstruction algorithm. For different or varible scene, the intrinsic and extrinsic parameters of camera may be required to modify, for example, change focus length for different depths, change aperture size for different light intensity, change the skew angle between optics axises of camera and projector for ideal viewfield, etc.

对于不同的或变化的场景，摄像机的内部参数与外部参数可能需要调整，如对于不同的光强需要调整光圈的大小，对于不同的景深需要调整焦距的长短，甚至需要调整摄像机的光轴与编码投影系统的光轴之间的倾角，以使采样范围正好落在被照明的范围内。

Simulation result shows that X-ray spot size is almost certainly convergent when the number of beamlets increases gradually,and the convergent size is about 1.03 mm.

计算结果表明：子束流层数一定时，焦斑直径波动在0.03mm范围内；随子束流划分层数的不同，计算所得焦斑直径的最大不确定度为±0.05mm，而焦距几乎不变化，其波动在0.08cm范围内；随子束流划分层数的增加，焦斑直径计算结果是收敛的，最终收敛值约为1.03mm。

In general, for each field stop size, choosing eyepieces with shorter focal lengths and larger apparent fields of view will allow you to see more detail and fainter stars.

通常，针对每一个尺寸的视场光阑，选择短焦距和大表现视场的目镜将允许你看见更多的细节和暗淡的星光。

Of course, avoid duplicating focal lengths. For example, if you use a 31mm Nagler (with a 42mm field stop diameter), you would not need a 32mm Plossl (with a 27mm field stop diameter).

当然，也要避免焦距重复，例如你使用一个31mm的Nagler (42mm视场光阑)，你不需要一个32mm Plossl (with a 27mm视场光阑)。

Improved the symptom that LCD turns off or the camera cannot focus on the high brightness subject with the Flex Focus Point at the focal length of 100mm.

改善了当自由焦点在100mm焦距(我想应该是对应于35mm相机)时，LCD关闭或是相机无法对高亮度物体对焦的现象。

Largest selection of diameters and curvatures for all types of focusing requirements Laser quality:λ/10 surface figure, 10-5 surface quality All CVI Melles Griot low-loss, high-energy AR coatings available Lens mounts available Refer to CVI Melles Griot standard size codes, radii of curvature and radii tolerance charts

用于所有类型透镜的焦距要求的直径和曲线的最大选择激光性能：λ/10表面指数，10-5表面性能所有的CVI Melles Griot低损耗，涂有AR高能量可利用的透镜支架参考CVI Melles Griot标准，曲线半径和半径公差图

Describe a simple laboratory method of measuring the focal length of the lens.

试描述一简单实验以量度这透镜的焦距。

TIM: I do my best to use the elements that are under my control; lighting, focus, lenes, depth of field, model, etc to increase my chances of being in the right place and right time for when that something special happens.

我尽最大努力利用那些我可以控制的元素：光、焦距、镜头、景深、模特等等来增大我在正确的时间出现在正确的地点等待某些特别的事情发生的几率。

In addition, the method for 3D line reconstruction from line equation and shoot plane equation is presented respectively.

与以前方法的不同之处是新方法建立在焦距变化的自标定基础之上。

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。