焦距

Flexible templates allow to imprint data directly from metadata contained in images: comment, date, time, exposure, f-number, ISO, focal length, device make and model, file name, copyright sign and add your own description to images.You can select the desired language, font face, size, color, background, opacity, placement, date/time format, etc.

灵活的模板，允许数据直接从中继在图片中所包含：评论，日期，时间，曝光， F数，国际标准化组织，焦距，设备制造商和型号，档案名称，版权注册，并加入自己的描述可以images.you选择所需的语言，字型，大小，颜色，背景，不透明，位置，日期/时间格式等。

A R-C system with foci of 2 m and f-number F/4 was taken for an example, the principles of stray light eliminating and evalutiong in reflective optical system was put forward. Lens hood in the main mirror, lens hood outside and window shade, lens hood in the secondly mirror were designed by CAD modeling.

以焦距为2 m，相对孔径为1/4的R-C系统为例，介绍了利用计算机仿真技术进行消杂散光设计和评价的原理，结合CAD建模进行了主镜内遮光罩、外遮光筒、次镜百叶窗式遮光罩的设计。

The F-stop was 16 with a focus distance of 3 feet.

光圈设在F16，焦距是3英尺。

The program scans a folder tree and generates a statistical overview for a variety of cameravalues, including model, f-stop, focal length, flash used, exposure and others.

该软件扫描一个文件夹树并且生成一个包括型号，快门，焦距，闪存使用，曝光等在内的各种不同的照相机参数值的统计概要。

The field glass es adjust with a screw.

双筒望远镜是用一个旋钮调节焦距的。

The field glasses adjust with a screw .

双筒望远镜是用一个旋钮调节焦距的。

Finally, we will see that the diffraction limited area in the field of view is proportional to the focal length.

最后我们将看到，衍射极限影响的区域与焦距是成比例的。

When you catch a fireball on your camera the photo will be out of focus.

当你的相机恰好捕捉到一颗火流星的时候，你会发现相机的焦距没有调好。

Besides, the factors which affected the distance between the two positions and the size of the flattop profiles were studied.

此外，还研究了对于不同的聚焦透镜焦距和环形光阑中心拦截比，不同空间相干度对平顶光束的影响。

The experimental investigation shows that the size of the flattop profiles and the distance between the two positions decrease with the increase of the spatial coherent length and the obstruction ratio of the annular aperture .

研究表明，两处平顶光束的大小及两处平顶光束之间的距离随着空间相干长度和环形光阑拦截比的增大而减小，随聚焦透镜焦距的增大而增大。

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。