the present invention relates to a photographic flash device used with a common still camera in order to photograph a patient &# 39 ; s operation under a shadowless lamp . specifically , the present invention is characterized in that the flash from a stroboscopic unit positioned with the still camera indirectly actuates a flash device housed in the shadowless lamp , thereby causing substantially simultaneous action of a light - emitter of the flash device . for this purpose , the present invention includes a light receiver , like a photo cell , which functions as a synchronous light - emission switch ; a focusing reflector which focuses the flash from the stroboscopic unit positioned with the camera and which is located outside the lamp housing and which illuminates and activates the light receiver ; a light shielder which prevents the primary reflection beam from the illuminated field of the shadowless lamp from falling onto the light receiver ; a charger connected to a power source and the light receiver ; and a light - emitter , like a stroboscopic lamp , which is connected to the charger and which emits light in the same direction as that of the shadowless lamp .