I am on the verge of ordering a Tokina 11-20 but have been looking into filters for it. I only own one other filter which is a Hoya 52mm CP and I use it for photographing cars with the Nikon 35mm. I have read that CP filters on a wide angle lens can cause strange effects but this seems to be for landscapes, would I get the same issue with cars and does this also apply to ND filters? I would probably get a Cokin ring and adapter for square ND filters.

