an ND filter for my Tokina 11-16 F/2.8 ?

[Havok]

That's the worst case of VND Xing out I've ever seen.

Are you stacking a polarizer with the VND on the lens?

If you're dialing the filter down to the absolute darkest, that's your problem. They all do that. Just some are better than others. Some start Xing at 6 stops, some at 7 or 8, and some high $ VND won't exhibit any Xing until 9 or 10 stops.

its either extreme vignette or the X, no inbetween

 

[jsecordphoto]

Those variable nd filters are garbage anyway. I recently started using Vu filters (both screw on 77mm and 150mm square filters) and they are excellent. If you plan on stacking filters (like a CPL and a ND) I would suggest buying 82mm filters and a step up ring to avoid vignetting.

 

[480sparky]

Those variable nd filters are garbage anyway.........

Don't say that loud enough for my Singh-Ray to hear you.