Fig. 6: “First time right” design results for the four-surfaces monolithic infrared camera objective.
From: Freeform imaging systems: Fermat’s principle unlocks “first time right” design
a Cross-section of the system from direct calculations with peak-to-valley freeform departure (PV) from the base sphere for the second and only freeform surface. b Corresponding spot diagrams for six selected fields based on aberration calculations. c Cross-section of the subsequently optimized system combined with peak-to-valley freeform departure (PV) from the base sphere for the second surface. d Corresponding spot diagrams for the same six fields based on aberration calculations
