Laurie:
open camexport.py and search for "fov = "
  change the part after the = so the line reads "

        fov = 360 / pi * atan(12.75 * min(1.0, float(params.resolutionY)/float(params.resolutionX)) / focal)

" (keep the spaces!)

open PoserLuxExporter.py:
find: "camparams = self.globalParameters.get("Camera", exdict())"
add after:

        camparams.resolutionX=resolutionX
        camparams.resolutionY=resolutionY