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The reason for this is that as we know, longer focal length lenses magnify the image, but they also magnify the camera shake.

正如我们前面所学，更长的镜头焦距虽然放大了图像，但同样增加了镜头抖动。

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Using a longer focal length and photographing stars far from the north star increase the distance stars will move across the image.

使用长焦镜头拍摄远离北极星的星星，会增加星星在相片上移动轨迹。

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Using a lens with too long a focal length, for instance, makes the image appear flat.

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