OK I looked at the source again and I found where the change is made. It
scales the up and right vectors, but I don't understand exactly by what
values.
What is k1/k2 equal to?

Here's the section of POV's code:

if (((had_up == false) && (had_right == false)) || (had_angle == true))
   {
    // resize right and up vector to get the same image
    // area as we get with the perspective camera
    VSub(tempv, New->Look_At, New->Location);
    VLength(k1, tempv);
    VLength(k2, New->Direction);
    if ((k1 > EPSILON) && (k2 > EPSILON))
    {
     VScaleEq(New->Right, k1 / k2);
     VScaleEq(New->Up, k1 / k2);
    }
   }

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