每张图片有20秒曝光时间。
下图是用红-绿-蓝滤光片拍摄的单一20秒曝光照片。
The image below is a single 20-second exposure taken with a red-green-blue filter.
为了表现接近我所能看见的黑暗场景，我在2分钟的时间内采用了7个连续不断的15秒曝光。
To render the dark scene close to what I saw I took 7 consecutive 15-second exposures in under 2 minutes interval.
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