I've recently ended up with two circular polarizers, both made by Kenko. One is a vernier, marked C-PL(W). The other reads Kenko Pro1D Wide band C-PL(W). This latter one is the reason for my question. Under reflected light, it has the look of fine crepe paper under the glass, but when I look through it, does not appear to distort. The other is smooth. Is this normal, or indicative of a problem with the polarizing film?