Sketch of StarDICE sensor calibration bench optics. The characteristics of the optical elements are given in Table 1. The light provided by the integrating sphere ISl is filtered by the SP-DK240 monochro-mator and focused in a plane where the reference (S2281) and target (ΓΜΧ411) sensors can be positioned thanks to a motorized XY-stage. An aperture stop (Baffle) is used to clean the focused beam from stray light. The half-reflecting plate redirects half of the light beam on a time-stability monitoring camera (IMX174). The linear stage can alternatively bring the sensors in direct view of the second sphere (IS2) providing flat-field illumination.