Comparison of different optics-related effects. The images represent the synthetic corona, the diffracted light, the ghost light and the scattered light. The diffracted light is calculated for a symmetrical configuration. The brightness of the images is expressed in MSB, the color scale is the same for coronal and diffraction scenes, and another one for the ghost light and scattered light scenes. Bottom panel: horizontal profiles from the images are denoted by the blue, the green, the yellow, and the red solid lines, correspondingly, while the blue dotted line denotes vertical profile from the coronal scene, which corresponds to the polar corona. The thin green line represents diffraction for the worst non-symmetrical configuration, with both telescope tilt and solar shift (right panel in Fig. 6), the thin yellow line represents the ghost light calculated for this non-symmetrical configuration. The left vertical axis is expressed in MSB, whereas the right axis is expressed in photon per pixel, which is obtained by applying Eq. (1) using t_exp = 1 s and taking into account MSB_W.