I used only the polarizer lens when I shot the photos with the black circles at the corners. No stacking! I don't know anything about a Nikkon adapter that should be put on before screwing on the polarizer lens? At allexperts.com I was told that my polarizer lens was too thick, that a thinner lens would solve the problem. But I will try using the zoom instead of shooting a wide angle photo and see how it works. Thanks.