The ZERN merit function seems to only give the Zernike values of the Image surface, but the Zernike coefficients are reported in the Wavefront Analysis table for ANY surface. I want to be able to extract the Zernike values for a surface other than the Image surface which are clearly available. How do I do it and represent it in the Merit Function Editor. The ZERN fucntion doesn’t have a parameter which will specify the surface of interest. 

Would appreciate help if anyone has tried to do this.

Adrian_J