CP without MRC是最基本, 没有多层镀膜(MRC)容易花和不容易清洁.
Kaeseman CP+MRC是边框密封性更好一些, 颜色看下面的B+W自己说好像也要好一些:
The 'high-end' polarising foils of the Kasemann-type filters are neutral in colour, they have a higher efficiency than conventional polarising foils and they are cemented between high-grade plano-parallel optical glass.