I agree that one should experiment with various focal lengths. In matters of creativity sticking to the "rules" leads to mere dogma rather than creation. However, it is easier to plan a trip if you know both start and end points. I am a firm believer in creative serendipity but such good luck more often visits those who understand their points of departure than those who do not. It is true that today photographers are varying from the standards but that has always been true of the more adventurous. It is just that today we are given greater permission to be "odd". Still, the "portrait" focal length was based upon the laws of optical physics and the idiosyncracies of human vision. Those have not changed though our desired artistic interpretations may have. As for "what is the standard Poser lens?" I'm not sure that can be determined considering that our "negative" size can be anything we wish. I should experiment with that to see if it holds true in Poser's world.