the flash shoe and the attachment of a TTL connector to facilitate this). The rewind release was moved from the front right faceplate to the top of the camera between the ASA setting dial and the advance lever arm. The OM-2S had three operational modes. The most noted was the provision of a program setting which permitted totally automated selection of aperture and shutter speed by the camera circuitry. Olympus offered a program mode without the need for modification of existing lenses or the purchase of special program-compatible lenses. The only proviso to using program mode was that the lens in use be set to the highest f-number to permit the program mode to operate. If the aperture was not set to the highest number, the LCD display would flash an aperture symbol (and, if activated, the camera beeper would sound) to warn of the problem. The "Auto" mode operated in much the same manner of the older OM-2N MD offering aperture preferred automatic exposure with averaging metering off the first curtain and/or film to determine which shutter speed would be used for the exposure. The "Manual" mode metered in the central microprism collar area only (roughly 2% of the field) - giving the spot metering in the camera's model name. Information on the spot metered value was provided on an LCD bar-graph version of the older match-needle system used on the OM-2N MD. Both shutter speed and aperture were under the photographer's control. Metering circuit changes versus the OM-2/OM-2N The OM-2S still made use of the direct off the film metering although the OM-2S used a single metering cell in the base of the mirror box for all metering. On the earlier OM-2N MD model series the dynamic metering was accomplished via two silicon blue cells mounted just behind the lens mount which were aimed at the first curtain/film surface. The meter needle for the viewfinder was driven by another pair of CdS cells mounted in the prism. The OM-2S used the same metering cell for all operations and light for the preview reading was sent to the cell via a secondary mirror mounted behind the semi-opaque main mirror as in the OM-3 and OM-4 models. The self-timer on the OM-2S was electronic. On activation the mirror would lock-up until exposure. If cancelled at any point the shutter would complete the exposure. The self-timer switch, placed where the previous-generation