In addition, both times the effective focal lengths of the standards were measured using a NIST traceable nodal slide bench, and the center thicknesses were measured using low-coherence interferometer. The spherical aberration and the effective focal length results are analyzed for statistically significant changes. The results are also compared to the Zemax models of the standards.
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David Compertore, Filipp Ignatovich, Michael Marcus, "Spherical aberration standards and measurement system stability over time," Proc. SPIE 9633, Optifab 2015, 96331X (12 October 2015);