A third possible device for measuring 3-D displays is an imaging photometer. In practice, this can be done using an imaging camera with a photopic filter and optics with a small enough clear aperture. We have built such a measurement system in our lab. The system employs a V(λ)-filtered high-performance 12-bit scientific CCD camera system with a 4-mm aperture. Figure 3 shows the system with a simulated measurement set-up.