知道这样一件事是很重要的——长焦和短焦都使得夜空的拍摄富有魅力，它们解决的是不同的美学问题。
It is important to understand one thing - shooting of the night sky is equally fascinating with long and short focuses, they just solve different aesthetic tasks.
先前的一张焦距短，第二张他用了长焦。
For the first shot he used a shorter focal length and the second shot he used a longer one.
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