I have a Nikon D80 (18-135mm). Just bought a couple of Quantaray filters. When I use the circular polarizer filter 67mm) in combination with the skylight 1A (67mm), I'm getting a dark shadow in the upper left corner of all photos. Very small shadow but enough to ruin photos.

Is this happening at all focal lengths? Is the shadow in the same place regardless of the light orientation (try taking a picture, then hold the camera upside-down as you point it in the same direction and take another picture). Is this happening at all focal lengths? Is the shadow in the same place regardless of the light orientation (try taking a picture, then hold the camera upside-down as you point it in the same direction and take another picture).

Thanks for the response. The shadow is most apparent 18-24mm. I took a couple of new shots with change in light orientation and the "shadow" is much more pronounced and shows up in all four corners to different degrees when camera is held upside down.

Bottom line. When I just use the circular polarizer without the skylight 1A the photos are fine. When I just use the skylight filter the photos are fine. The combination is the issue with the extreme wide angle setting - which I use the majority of the time when using a polarizing filter. I never had this problem with my old Nikon and Nikon polarizer filter. Thanks for the response. The shadow is most apparent 18-24mm. I took a couple of new shots with change in light orientation and the "shadow" is much more pronounced and shows up in all four corners to different degrees when camera is held upside down. Bottom line. When I just use the circular polarizer without the skylight 1A the photos are fine. When I just use the skylight filter the photos are fine. The combination is the issue with the extreme wide angle setting - which I use the majority of the time when using a polarizing filter. I never had this problem with my old Nikon and Nikon polarizer filter.