This can be a tedious process because the first time you create the plane, you have to rotate the camera and change the focal length at the same time to get a good match.
这个过程可能很乏味，因为你要先建立平面，还不得不去旋转摄像机，并调节焦距以得到好的匹配效果。
For the first shot he used a shorter focal length and the second shot he used a longer one.
先前的一张焦距短，第二张他用了长焦。
The first shot was taken with a short focal length (around 70mm) and from a relatively close distance and the background looked quite far away and small.
第一张焦距约70 mm，在相对近的距离拍摄，背景看起来很远而且很小。
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