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3.2.3 快门速度对曝光的影响
如前面所述,快门速度决定了曝光量的多少。具体而言,在其他条件不变的情况下,每一挡的快门速度变化,都会导致一倍曝光量的变化。例如,当快门速度由1/125s变为1/60s时,由于快门速度慢了一半左右,曝光时间增加了一倍,因此,总的曝光量也随之增加一倍。
![](https://epubservercos.yuewen.com/F82E6F/23721549509464606/epubprivate/OEBPS/Images/Figure-P50_26437.jpg?sign=1739267696-EzyvK83EplXcdYyF4tf4XxmaN1MF9BF2-0-825b93d6dd2a85a35899edf5baae780e)
50mm F4.5 1/60s ISO640
![](https://epubservercos.yuewen.com/F82E6F/23721549509464606/epubprivate/OEBPS/Images/Figure-P50_26438.jpg?sign=1739267696-xVJglUSKkYB55TdYwxfFGadLD9oMLVPW-0-842ec00238c48aa29f817f6d73dbfba7)
50mm F4.5 1/40s ISO640
![](https://epubservercos.yuewen.com/F82E6F/23721549509464606/epubprivate/OEBPS/Images/Figure-P50_26441.jpg?sign=1739267696-bcQPMb7yt2jIZajJuNmfktfvrX1kk03A-0-5fef290bd6e94b4fce74337a0aa89bff)
50mm F4.5 1/30s ISO640
![](https://epubservercos.yuewen.com/F82E6F/23721549509464606/epubprivate/OEBPS/Images/Figure-P50_26442.jpg?sign=1739267696-52aXT14sVRnwZlCd1HcG10WLIQXUAUmN-0-78418d8d0717ead8c531f6eca05c614d)
50mm F4.5 1/25s ISO640
![](https://epubservercos.yuewen.com/F82E6F/23721549509464606/epubprivate/OEBPS/Images/Figure-P50_26440.jpg?sign=1739267696-xTpZA5IyoZY1eQl59x1eYQxgdymeKnNG-0-e50dc17c370369bf6cc9302fa9c74e82)
50mm F4.5 1/20s ISO640
![](https://epubservercos.yuewen.com/F82E6F/23721549509464606/epubprivate/OEBPS/Images/Figure-P50_26439.jpg?sign=1739267696-btsStTcj0RcC68W4rb9Av5Kopacm7kd5-0-dbd2cd4fcb1bfac6d90bf821923c3ecb)
50mm F4.5 1/13s ISO640
通过上面这组照片可以看出,在其他曝光参数不变的情况下,当快门速度逐渐变慢时,由于曝光时间变长,因此,拍摄出来的照片也会逐渐变亮。