I have created a scale model of an installation that I am building. I am using a texture projected from a camera onto a model which is a series of offset planes. The intention is that the image will resolve if a person stands in a particular spot in the room. Everything is working OK except when using a 50mm camera to project the texture the person will need to stand a long way back from the installation for the image to resolve. Much further than I was expecting. Is a 50mm focal length the most accurate approximation of the human eye?