Abstract: An apparatus for exposing photosensitive media is disclosed in which the light reaching the photosensitive layer of the media is monitored, with the exposure being terminated after the desired amount of light has been received. A multiple exposure control is also provided which adjusts the relative exposures during first and second exposures of the photosensitive material. A special roller curtain mechanism is also disclosed. In addition, the apparatus includes a vacuum system for generating a vacuum, as the curtain descends with the vacuum being drawn between the blanket or curtain and a glass plate which supports the sensitized media and originals being copied. The surface supporting the sensitized materials is inclined to facilitate loading and unloading of the apparatus and also the operation of the curtain.