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。
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。
Mirror lock-up (MLU) is a feature available in some SLR cameras which aims to minimize camera shake induced by mirror-slap (which produces the characteristic snapping sound of SLR cameras).
有些单反相机具有反光镜锁定(MLU)功能，可以减小镜面翻转造成的相机抖动(这也是单反相机经典“喀嚓声”的来源)。
Image stabilization systems reduce the blur caused by camera shake, allowing sharp pictures to be taken even in low light or at long focal lengths.
图像稳定系统减少了由于相机抖动造成的模糊现象，使得即使在弱光以及长焦距下拍摄的照片也可以非常清晰、漂亮。
Carry a tripod or watch that your shutter speed is fast enough to prevent camera shake.
使用三脚架拍摄或者设置较快的快门速度以防止相机抖动。
Anti shake systems 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。
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。
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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