Abstract: A high-density rapid random - access retrieval apparatus for retrieving micrographic and data images stored on plural windowed discs. The apparatus is comprised of a disc/radial selection mechanism which moves axially of a cartridge containing a stack of closely spaced discs. Each disc has a clear window disposed on a radius thereof and a plurality of windows containing micrographic and/or data images disposed along other radil. When the disc/radial selection mechanism has moved to a selected disc, the radial component rotates the disc until the radius upon which the desired image is located is aligned with the clear windows in the other discs. The optical system includes lens and reflecting surfaces. At one end of the system is a projection means and at the other end lies its receiving means. Elements of the system are vertically adjustable so that the line of sight of the system is projected through any selected image bearing window.