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。
By assuming the weak lens focal length expression to be the first term in a power series a simple and accurate formula can be derived for the objective focal length of a magnetic electron lens.
用假设弱透镜焦距表达式是一个幂级数中的第一项的方法，可以导出相当准确且便于实用的电磁电子透镜物镜焦距公式。
The first single-curved reflective surface has a focal length greater than that of the second single-curved reflective surface.
第一单弯曲反射面有一个焦距大于表面的第二个单弯反射。
The first single-curved reflective surface has a focal length greater than that of the second single-curved reflective surface.
第一单弯曲反射面有一个焦距大于表面的第二个单弯反射。
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