Questions? Go here: www.youtube.com Explanation on understanding the benefits of circular polarizer (CPL) glass filters. We do NOT recommend those unlisted brands: Bower, Canon, Fujiyama, Hitech, Kenko, Marumi, Polaroid, and Sigma.
A review video for B+W Kaesemann CPL Filter. The filter is rotated over 360 degrees. Varying reflection intensity on a shiny laptop keyboard can been seen. Note that at certain orientation of the polarizer, the reflection intensity is higher than what would be seen without a polarizer. Canon T2i/550D, EF 135mm F/2L.
B+W Circular Polarizer Filter S03 F-PRO LCD Screen Test