Designing with freeform optics makes it possible to correct imaging systems to high-performance levels in a compact format. To justify the extra challenges inherent in the design, fabrication, metrology, and assembly of systems utilizing freeform optics, engineers need a realistic understanding of the performance that can be expected. The real-world performance of these systems has remained under-explored in the literature, a factor that may dissuade the adoption of freeform optics. In this work, the MTF of an F/3…