Because it is this small, its focal length is only 18 metres.

因为它体积偏小，所以它的聚焦只有18米。

Some are capable of changing focal length, while others keep the image sharp at all times or offer 360-degree vision.

一些相机能够改变焦距, 而另一些则能够时刻保持图像清晰或提供360度的视野。

And then if there are new things that could be implemented in there, and using focal length in a certain way.

然后，我还会思考在这个地方能不能有一个新点子, 并以某种方式使用焦距。

But the focal length doesn't really have anything to do with getting this kind of distortion.

但是焦距与获得这种失真并没有任何关系。

It’s the equation that relates the object distance and the image distance to the lens’s focal length.

这是将物距和像距与镜头焦距联系起来的方程式。

The role focal length plays is just framing the scene to keep the subject the same size.

焦距的作用只是构图场景以保持主体大小相同。

You get maximum magnification when the real image is just barely inside the focal length of the eyepiece. .

当真实图像刚好在目镜焦距内时，您将获得最大放大倍率。

The next step is to focus all of the visible spectrum into the same focal length using a meta-surface lens.

下一步是使用超表面透镜将所有可见光谱聚焦到相同的焦距。

It's the equation that relates the object distance and the image distance to the lens's focal length.

这是将物距 和像距与镜头焦距联系起来的方程式。

And one measure of a lens is its power, which is expressed simply as one over the focal length.

镜头的衡量标准是它的光焦度，它简单地表示为-焦距上的一个-。