Hasta La Motion!

A problem that I have when I track my footage in Syntheyes and place a 3d object over it in Syntheyes or 3dsmax (same problem) it doesn’t completely match the footage. For example if I place a Box over a building the perspective isn’t perfectly right. Like half an inch off. The track is solid and the cube does follow the camera perfect too.

Is this a lens distortion problem? Or is there something wrong with the settings in my 3d camera?

I hope that someone can help me out with this.

Thanks alot,
Maarten