A fish eye lens is an extremely wide-angle lens. A "normal" lens for a 35mm camera is 50mm (focal length). A wide-angle lens is less than that (e.g., 28mm). A telephoto lens is more than that (e.g., 300mm). Try experimenting with the focal length (or the angle of view) attributes until you get what you want. You might also try experimenting with depth of field
, creating realistic camera focusing.