A good rule of thumb to minimise camera shake is to set the shutter speed at a minimum of one second divided by your focal length.
测算你相机的安全快门速度有一个好的方法，你相机镜头焦距的倒数，就是你避免镜头抖动的快门最小值。
Roller shutter type, mainly divided into the following categories.
卷帘门种类众多，主要分为以下几种类别。
Roller shutter type, mainly divided into the following categories.
卷帘门种类众多，主要分为以下几种类别。
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