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云彩拍摄  发帖心情 Post By:2005/6/21 19:47:32 [只看该作者]

早晚的光线颜色很漂亮,但不容易掌握好。尤其是不容易碰到好的云彩。云较高时,才有机会出现火烧云。这时天空较大的面积的亮度会比较均匀,色彩也较好。如果云较低,就象你邮件中的第一和第三张,则反差很大,太阳附近很亮,而云的后面则很暗,地面就更暗了。这种情况下,如果有一片水面作前景就比较好。因为水面可反射天空的光线,使得画面不至于有太大的黑暗区。测光时,我通常会以需突出的主要云彩或天空为点测的目标,并参考最亮和前景的亮度来决定所需暴光。我在这方面也还在探索中,还需要积累更多的经验。有些摄影师喜欢用渐变中灰镜来调整天空与地面的亮度,效果也不错。这种滤镜上部的密度较大,可将天空的亮度减少1-3挡(不同的镜减光的系数不同),下部则是完全透明的,使地面的亮度不受影响。我没用过这种镜,还没有实际经验。据我观察,云彩的形状有的很上镜,有的拍出来现得散乱,不好看。云彩要突出,后面天空的亮度和颜色很关键。相互间要有一种对比的关系,太接近的话就不好看。例如白云就需要蓝天来衬托,这时偏光镜就可发挥作用。

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