Apparatus is described which has been developed to photograph the development of simultaneous nuclear electromagnetic cascades in an ionization spectrometer. Light is emitted by the cascades as they pass through layers of plastic scintillator within the spectrometer. This light is imaged onto the photocathode of a four‐stage cascade‐type image intensifier with magnetic focusing. When suitable events occur within the spectrometer the intensifier is pulsed so as to transmit and intensify the stored image. The output screen of the intensifier is then photographed. Two optical systems and image intensifier cameras are used so as to obtain right angle stereoscopy of the cascades.