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focal plane shutter 焦点平面快门 ; 帘幕式快门 ; [摄] 焦面快门 ; [摄] 焦平面快门
a focal shutter 幕帘快门
metal focal plane shutter 钢片快门
electronically-controlled focal-plane shutter 电子控制焦平面快门
focal plane steel shutter 焦平面钢片快门
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。
In taking a picture, the shutter, the focal length and the other things must be adjusted as the case may be.
在拍照过程中，快门、焦距等等必须按实际情况加以调整。
Camera shake rule: The slowest shutter speed at which you can safely handhold a camera is one over the focal length of the lens in use.
手持拍摄时，最低安全快门速度为所用镜头焦距的倒数，低于这一速度，相机震动可能导致照片的锐度下降。
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