I have wandered through the manual looking for this answer and it is
probably an often asked simplistic one.  If I take several spheres and have
them placed the same distance from the camera (various distances in the x
and y planes) the spheres furthest away from dead center become distorted or
warped.  The further away the more distorted they get.  Is this a simple
camera setting issue?  My current camera setting is:

camera {
   location <0, 0,-6>
   look_at  <0, 0, 0>
   up       <0, 1, 0>
   right    <1, 0, 0>
}

I have tried removing the up and right but it doesn't seem to affect it
much.  Is there any way to make the spheres look perfectly round regardless
of position?

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