偏振镜选购经验谈

Polarizing Filter Purchase Experience

被摄景物上的反射光形成的眩光往往大部分属于偏振光,可以用偏振镜滤去,从而显著提高画面质量。偏振镜有线偏振镜和圆偏振镜之分,一般的偏振镜为线偏振镜,有可能影响数码相机的AE和AF功能,圆偏振镜的前部起偏振镜作用,通过特定振动方向的偏振光,其后面部分则能使该偏振光的振动方向在一个圆周上旋转,恢复为非偏振光,就不会影响相机的AE和AF功能了。本文介绍如何分辨这两种不同性能和价格的偏振镜。

Glow formed by light reflected from shot object is mostly polarized and can be eliminated by polarizing filter thus offering better picture.Common polarizing filters are linear and may affect the AF and AE functions of digital camera this can be remedied by using circular polarizing filter therein the front part is a linear polarizing filter whereas the back part is a specific filter capable of rotating the light vibration plane of the polarized light passed through the front filter consequently not affecting the AE and AF functions.This paper offers methods for distinguishing different polarizing filters.