Hi Bob, thanks for thequick reply. Reference Photos I mean is human head reference photos, from 3dsk or lets say screenshots from a movie, whatever image. When trying to sculpt a mesh that matches the reference, using the right camera settings while sculpting seems important. If the "perspective distoration" of the camera used while sculpting is inappropriate, one will not be able to make a mesh that will match all the references. One extreme case example of this is in zbrush, if you sculpt and forget to enable perspective mode first. So I wonder what a "real world camera" perspective is ( and what projection matrix that would be ). In Blender, you have access to the camera projection matrix, and I wanted to check if Poser is using the same by default.