... It seems filter manufacturers still to be impossible to get a few thick zones on the rings their filters. So also the B + W. Every time I aufschraube as second screening the polarizing filter, then I need a tool to separate the two again. It does not matter if they were not at all or only slightly tightened. Suffice the tightening torque of the rotary tables of the polarizing filter. And the B + W is extra small.
