Image compositing with different scales
The camera must keep the same distance in both images according to the scale factor.
Camera rotations must be done with the center of the optical system, called nodal point, as the origin.
Light rays that cross the nodal point do not change direction.
No parallax effects take place as rotations around the nodal point preserve homotetias.
Procedure to localize the nodal point.
Localizing the nodal point.