An ƒ/3.5, 24-in. aerial-lens design has been evaluated heterochromatically to test the relative merits of geometric versus wave-optical transfer calculations. Both methods yielded substantially the same results for the lens under test. The geometric calculation required about 6½ min of high-speed computer time while more than 3 h of equivalent computer time was required to make the diffraction calculations.
CLARENCE P. BRAY, "Comparative Analysis of Geometric vs Diffraction Heterochromatic Lens Evaluations using Optical Transfer Function Theory," J. Opt. Soc. Am. 55, 1136-1136 (1965)