A majority of people will tell you to make the focal value for the main camera 100. This flattens things out, removing the "fish eye" effect. It also allows for more acurate tracking for things (like eyes for example) that are pointed at the main camera. People seem to think this is the most "realistic" looking setting for the focal. I use it most often. Sometimes if you want a different effect you can use a lesser value, this increases the fish eye effect, enlarging the things closest to the camera and shrinking things further away - it depends on the look you're trying to get. It is hard to notice a difference for settings past 100 or so. In another thread some time ago, I think someone said the human eye has a "focal value" of about 55 in poser terms. Someone correct me if that is incorrect. Hope this helps some, Unzipped