Quote - ok I did a test with Sketchup and the beta SU2LUX... no camera distortion. both views - SU and Lux - matched.

so. whats the common demonitator between DS and Poser cameras?

Dizzi posted the reason a while back iirc.
LuxRender's field of view is determined by the shortest dimension while poser uses horizontal fov,  so currently you get the wrong view when width > height.