Having an issue where my screw-on polarizer lens is visible in the corners when shooting at 24mm. I also have a film F100, and using the same filter and lens does not show any vignetting. I think the filter is Hoya and it looks just like any other screw-on lens.

I now have to avoid shooting w/ my Cokin filter holder at 24mm for the vignetting reason, or crop in post processing, but it's just hard to believe that using a normal filter would cause this.

Comments?