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一、前言快门是一切摄影仪器的重要组成部件。快门是在一段选定的时间内,允许从被摄物体来的光线,通过它落到感光层上去的机构。当快门逐渐打开和关闭物镜的有效光孔时,我们可得到快门工作一个循环的特性曲线(如图一)。曲线显示了物镜有效光孔面积 S 随时间 t
First, the foreword Shutter is an important component of all photographic equipment. The shutter is a mechanism that allows light from the subject to fall through to the photosensitive layer for a selected period of time. When the shutter gradually open and close the effective aperture of the objective lens, we can get a shutter cycle curve (Figure 1). The curve shows the effective aperture area S of the objective lens over time t