It has nothing to do with relation to the lens . If you place TWO linearly polarized sheets lens work too at 90 degrees , perpendicularly , they will be out of phase which simply means that they cancel out all light . There is a bit of physics to it but all you need to know is that each polaroid filter limits light into a single direction , so if you add two filters you can cancel out all directions . Some light will obviously still pass through depending on the quality and thickness of the filter . Dirt cheap 3 D filters will do fine but if it ' s not enough you can stack them up on top of each other . <| sep |> Your initial email came off pretty dickish to be honest , and it didnt sound like you had even had any issues at that point .