Photos taken in low light or with long telephoto lenses can easily be ruined by blur caused by the camera moving during the exposure (camera shake).
光线不好、或者使用长焦拍摄,由于需要长时间的曝光,相机的抖动很容易让照片糊掉。
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。
The reason for this is that as we know, longer focal length lenses magnify the image, but they also magnify the camera shake.
正如我们前面所学,更长的镜头焦距虽然放大了图像,但同样增加了镜头抖动。
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