I have a 70-300 Nikkor VR Lens that I use with my D80 Nikon. I normally shoot with just a UV filter. A few days ago I decided to use a polarizer filter while shooting surfer photos on a beach. When I got home and viewed my shots on the screen, they are were blurred. I have very few blurred photos when shooting without this filter.

Anyone know what is happening?

A year or so ago I had a Neutral Density Filter that would not focus sharp either. I chalked that one up to a poor quality filter bought over the internet. Now I am not sure.

Can the filter effect the ability of the Auto Focus on the D80 Camera?

Steve