This cinematography field notes introduces the techniques of avoiding negative effects caused by shadows when shooting indoors where there is a large mirror as well as several windows and doors. To shoot in such an environment, you should first choose a direction to place the flash that echoes other light sources. Then, the photographer needs to find an angle that can block himself and the flash while ensuring the proper operation of the latter. At the same time, use different shutter speeds to control the darkness of the shadows, so as to capture good images.