> Let me try and explain that a little better: Converging the two camera views
> onto a nearer object can produce unwanted parallax shift of more distant objects
> (at least in a real camera lens), the result being that those further-away
> objects don't 'line up' correctly (and have unequal 'lens distortion') when
> viewed in 3D-- especially when using a wide-angle lens setting. It's an odd
> effect to describe, but it results in eye strain.
>
> POV-Ray's typical perspective camera is essentially a 'pinhole' camera-- not
> quite the same behavior as a real lens (the lens distortions are... different)
> so it might be worth experimenting with 'convergent' views vs. non-convergence
> views, to see if there is any real difference. I don't know; strange as it
> sounds, I've never made a 3D scene in POV-Ray (!) It's now on my to-do list....
>
>
>
>

Having a convergence can be beter, for cases when the center of interest 
is close, less than 10 times the spacing of the cameras, and the 
background don't contain far objects or is highly out of focus.
Think about 3D macro-photography. Very close, small, objects, tight area 
of focal sharpness.

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