The filter is high at the highest level. It integrates perfectly screwing and unscrewing and turning. In addition, the Pro series of B + W is sealed between the two glasses. So who in the world is a lot and his equipment sometimes rannimmt bit harder, which is again this detail shown.
Since I got it only arbitrarily, I could not take pictures so indeed, but he is well, just like my 3 other B + W polarizing filters in the optical performance to win us over. Just shut as if no filter would, because only then with blue sky and reflections without ;-)
Greetings.
