Very practical filter that has to handle and in the optical quality of my expectations completely. In sunny weather, as are obtained,. A deeper sky blue. Special joy makes it over again, when shooting through windows (from vehicles, from observation towers, while scanning of explanatory panels in nature or in exhibitions about the documentation) but to eliminate a substantial portion of the reflections on the glass surfaces. This is achieved depending on the conditions not always complete, but compared to my time without polarization filter corresponding images are much better. Concerns you have, however, that just in exhibitions, the light is already often insufficient, so you have to avoid when using the filter to increase the exposure time or the ISO sensitivity. On the other hand, the filter also substitute as a light neutral density filter (about 2 EV) is to use (extension of possible exposure time). Processing and optical quality are perfectly by multi-coating. Due to the very narrow version (3 mm) also results in wide-angle shots no appreciable additional Randabdunkelung. A front filter thread exists. Conclusion: not a bargain, but solid quality for the money.
