I have .dat files in Zygo Mx software from lens surface measurements done at 0.6328 microns. I would like to apply the interferograms to lens surfaces in an OpticStudio model and evaluate the transmitted wavefront error at a wavelength of ~3 microns. How do I do this? So far I have exported a .int file from Mx and converted it to an OpticStudio .dat file. Then I imported the .dat file onto a Grid Sag surface in OpticStudio. However, when I look at the wavefront error at the image plane before and after importing the .dat file (Analyze, Wavefront, Wavefront Map), it is exactly the same, as if I never changed the surface. How can I get OpticStudio to “see” the interferogram on the surface? And if I change the wavelength in the OpticStudio model to be something other than 0.6328 microns, does it automatically scale the imported interferogram to give the correct result at the new wavelength?