In a reading device for reading storage films, a reading light beam rotating about an axis of rotation is directed onto the storage film through a reading opening of a film support. Fluorescent light returning from the storage film falls through the reading opening into a photodetector. Misreadings produced by reflected secondary reading light are reduced by the provision of a filter at the reading opening, which filter allows at least some fluorescent light to pass and attenuates reading light reflected from the storage film.