当用长曝光拍摄的时候，用一个低的感光度可以减少可能出现的像差。
Using a low ISO setting will help reduce the aberrations that can appear when photographing with long exposures.
在我看来，他曝光度越低越好。
但在印尼的测试发现需要在低感光度的环境中可读，如在晚上没有电的房间里。
But tests in Indonesia found that it also had to be readable in low-light situations, like at night in a house without electric power.
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