调焦距

You must bring the object into focus if you want a good photograph .

如果你想拍出好的照片，你必须给特调好焦距。

Set f-number on 7,0, shutter speed on 45, and film speed on 50. And here we got.

把焦距设置成7.0，快门调到45，还有胶片速度50，在看一下。

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。

But only with the right focal distance and correct aperture could we get the true pictures.

只有我们调对了焦距，对准了光圈，才有可能得到真实的图像。

The factors for selecting the wavelength ranges to be measured are considered. The experiment equipment is introduced, with six key issues stressed, radiant power of light source should be higher, width of the I/O slits of the monochromator should be reasonable and both of them should be adjusted to an equal width, the focal length of the convergent lens should be longer, the exit of humidistat should be square, the function of vacuum pump and fog collecting hood is important, and the wavelength adjustment of the monochromator and the auto-record of the measuring signal should be controlled by a micro-computer.

讨论了实验中光波长范围的一些选择因素，详细介绍了实验装置，特别强调了实验装置中的6个要点：即光源的辐射功率要大；单色仪的出入射狭缝要合理且两者宽度应调成一致；会聚透镜的焦距要大；加湿器最后出口的孔必须是方的；真空泵和雾气收集罩的作用；微机控制单色仪波长鼓及测量信号的自动记录。

When focused near it's closest regular focusing distance, the lens will be difficult to mount OR unmount.

当调焦到接近它的常规对焦距离的最近端时它将难以装卸。

With the aid of Zemax software, a three-mirror, unobscured, high-resolution optical system with large aperture, long focal length was successfully aligned by first collecting interferograms from several fields of all image plane, and obtaining the wavefront error, namely, obtained wavefront Zernike polynomials; then using the self-made program package to calculate the optical system misalignment.

利用Zemax光学设计软件与自编计算机辅助装调软件，实现了对大口径、长焦距、无中心遮拦离轴三反射镜光学系统的装调。通过Zemax软件模拟光学系统的失调模式，得到整个光学系统的波前像差，把波前像差代入到自编的复杂光学系统计算机辅助装调软件中，计算出光学系统的失调量，与引入的失调量对比，证明了其正确性。在实际的装调过程中，用小型球面干涉仪分别收集3个视场的干涉图，得到失调光学系统的失调量，用Zemax软件验证失调量数据的正确性，从而指导装调。

You can also zoom in and out.

你可以调焦距。

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如何&调焦距、对光圈&这样一个任务。

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。

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。