Nodal Aberration Theory - Sigma Vector Calculator

This script demonstrates how to implement 3rd Nodal Aberration Theory, using paraxial raytrace data and real raytrace data from CODE V.

This is a script to demonstrate, in detail, how to implement third-order Nodal Aberration Theory, using data from paraxial raytrace data, as well as real raytrace data from CODE V, that is extracted using the the Matlab CODE V toolkit authored by Joseph M. Howard, Blair L. Unger, Mark E. Wilson, NASA. which is available at:

https://software.nasa.gov/software/GSC-15140-1

One of the main purposes of this code is to show the proper sign convention for the "Sigma" vectors. The other purpose of this code is to show how to predict node locations for the coma and astigmatism fields analytically, and calculate the true node locations (using Fringe Zernikes).