Zoom Script

Heres the zoom script, attach it to your Main Camera


var fov = 50;
function Update()
{
  if (Input.GetKeyDown("z"))
    fov = 5;
  if (Input.GetKeyUp("z"))
    fov = 50;
  if (Camera.main.fieldOfView < fov)
    Camera.main.fieldOfView++;
  if (Camera.main.fieldOfView > fov)
    Camera.main.fieldOfView--;
}