apparatus for storing a voltage analogous to an exposure parameter in photographic cameras with an electronic timer and with electric exposure measurement , having the characteristics that an analog - to - digital converter is provided as the storage unit , containing a digital - to - analog converter , the output voltage of which is fed to a comparator wherein this output voltage is compared with the voltage delivered by the exposure meter part . the signal obtained at the comparator output in the case of voltage identity stops the analog - to - digital converter and the voltage remaining at the output of the digital - to - analog converter controls the respective exposure parameter in the camera .