手持相机拍摄常容易出现的一个问题就是相机抖动,从而造成影像模糊。为此,有些厂家设计制造了减震镜头。由于镜头焦距越长时,镜头尺寸一般也较长、大,在相机有一点轻微晃动时,镜头前端摆动的幅度也越大,所以通常的原则是:以毫米作焦距单位,用焦距数的倒数作快门时间的慢端界限, One of the most common problems with hand-held camera photography is camera shake, which causes blurred images. To this end, some manufacturers design and manufacture of shock absorption lens. As the lens focal length is longer, the lens size is generally longer, large, the camera slightly sloshing, the larger the front of the lens swing, so the general principle is: in millimeters for the focal length unit, with the focal length of the countdown Slow shutter for the time limit,