When the focal length of a photographic lens is less than a first focal length, a dimming correction amount deltaY is set to a certain minus value (deltaYW=-WddY) (S100, S150). When the focal length is greater than a second focal length, the dimming correction amount deltaY is set to a dimming correction amount deltaYT for a longer focus side (S110, S160). For the focal length falling between the first and second focal lengths, the dimming correction amounts deltaY is calculated with the deltaYW and the deltaYT being weighted and mixed according to focal-length information. Accordingly, even when a photographic lens having a short focal length is used, flashing can always be controlled stably with accuracy.