This is a clapperboard that attempts to use two flashlights and sunlight as the third light source for triangular ring shooting with flashlights. The clapperboard elaborately describes the process of dealing with various technical aspects and problems in photography, including the joy of successful shooting and discussing the techniques that need to be improved in future shoots. This shooting clapperboard also records the lighting layout and shooting scenes in the form of photos, for the readers of Flash ZHUO Boshì to think about while reading.