The lens should be tightened enough that you can rotate the polarizing lens without unscrewing the entire lens. In my case, the lens worked perfectly, but when I wanted to shoot indoors, I couldn't remove the lens from my expensive new camera. The design has a very narrow (less than 1/16 inch) ring behind the polarizing lens that you have to grab and unscrew the lens assembly - I couldn't remove it by hand. Finally I made a metal ring using 4 90 degree screws threaded onto the 1/16" ring and then removed.
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