K&F Concept 77mm True Color Polarizing Filter HD optical glass, double-sided, 30-layer nano-coatings, circular polarizing filter (CPL), aluminum frame, water-resistant, scratch-resistant, fingerprint-proof I use filters... when I have to. Polarizing filters are among the filters that can make a real difference in terms of contrast enhancement/glare reduction in certain lighting conditions. It is important that I find this filter: - Excellent optical properties. Limited sharpness loss. (as good as it gets). - Neutral color - Adjustable polarization by rotating the filter as intended. - Thin. This filter is thin and should not cause vignetting in most cases. For the same reason, it can be combined with another filter without the risk of vignetting. While this is standard these days, it makes removing the filter more difficult than with thicker filters. - The threads are well formed and the filter screws on easily. - The light loss is about 1 stop, which is typical for today's high quality polarizing filters and better than the 2 stops of previous generations. Note for landscape photography: It is not recommended to use a polarizing filter with ultra wide-angle lenses in landscape photography, as they produce an uneven sky. That's a good filter. It performs above its price. Worth considering. Accordingly recommended.