Left: smoothed three-color image (red: 0.5–2 keV; green: 2–4.5 keV blue: 7 keV) of a simulated 5-Ms deep field (24′×24′) with AXIS. The extended red structures are galaxy clusters. The white boxes highlight two regions, one on-axis and the one at the boundary of the field of view: we show a zoom-in of these regions in the top and central right panels. The AXIS PSF is expected to have remarkably small degradation as a function of the off-axis angle. In the bottom right panel, we show as a reference a ∼2′ × 2′, 8′ off-axis 0.5–7 keV image of the 4 Ms CDF-S.