The CPL HD filter from Mentierer features a special professional design. The aluminum frame with a diamond pattern provides a professional appearance and a solid multi-coating to reduce unwanted reflections. The ultra-matte black coating on the frame and the optical glass, made with original Japanese Polaroid film, allows for nearly invisible lighting. This way, the light source, which typically reflects the lighting system, can be fully adjusted and made nearly invisible. When photographing objects behind glass, such as in a museum, the mirror effect of the glass can be suppressed with a polarizing filter. A polarizing filter can also enhance the visibility of fish and plants in a pond, which is difficult to achieve without a filter. Another effect of using a polarizing filter is that a cloudy sky can appear much more contrasted depending on the angle at which the filter is used.