However, in the case of our hardened sensor, the optical setup is more complex than a simple lens. Utilizing ZEMAX, a design analysis of our optical setup revealed that the spotsize is strongly varying with the position of the spot at the imaging sensor. At the central position, for example, the expected behavior occurs, showing an increasing spotsize with increasing wavelength. For some position at the outer edge of the imaging sensor, however, the simulation estimates a reversed behavior. When we average the RMS spotsizes calculated with ZEMAX for six different positions on the imaging sensor, we obtain RMS spotsize diameters of 8.6, 7.7, and for the wavelengths 486, 588, and 656 nm, respectively.