The invention relates to a photographic apparatus useable, for example, in medical radiodiagnostics, with a three-layer system lying between two electrodes, to which a d-c voltage is applied. The two outer layers are photoconductors and the middle layer consists of a material in which charge carriers can be stored. An image radiated from one side can be read out from the other side in the form of an electric pulse sequence by scanning by means of a light beam and can be reproduced on a television screen. The invention provides a storage layer which has areas in which charge carriers adhere and that on the side of the system on which the image is radiated in the electrode has the same polarity as the charge carriers for which the storage layer has traps.