central sync point. This shoe used two small pins to make contact with the camera circuitry. For this purpose an OM-2N MD will have the large securing threaded recess used for shoe 1 on the older OM-2 MD plus two smaller recesses for the added contacts visible on the rear of the prism above the viewfinder. The flash shoes are not backwardly interchangeable between models. The OM-2N MD added, via the shoe 4 circuitry, the following features to the OM-2 MD: A flash charge-ready light in the viewfinder and correct flash exposure confirmation by flashing this same green LED after exposure. The "N" also had a contact inside the film chamber for the Recordata back. Finally, if used with a T-Series flash, the flash and shutter would sync at "X" setting regardless of what position the sync switch around the pc-socket was set to. OM-2S/OM-2 Spot Program The OM-2SP Spot Program (OM-2S in the USA) was a thorough overhaul of the OM-2 innards to make the model more competitive. It has more commonality with the OM-4 than the previous OM-2, a fact which simplified production for Olympus which had, by the time of the OM-2S launch, released the OM-4 and the OM-3 models. It was manufactured from 1984 to 1988. The OM-2S used the OM-4 shutter mechanism but without the 1/2000 sec top speed, using instead 1/1000 as the maximum. It did, however, retain its mechanical Bulb setting as well as 1/60 second speed for use when batteries were depleted. This addressed a failing of the older all-electronic OM-2 models which were unusable without batteries. Additionally, a basic level of weather-sealing was provided as a new feature in the OM-2 line. While the older OM-2 models could routinely withstand harsh conditions, they were never advertised as having any environmental protection features. The OM-2S offered only 3.5 frames per second when coupled to the motor drive 1 or 2. The camera used an LCD display with a 90-second power-saving limiter for metering indications and warnings. This was visible to the left of the viewfinder area. All the previous focusing screens and accessories (with the exception of the flash shoe attachments) available in the OM system were compatible with the camera. The camera body had a fixed hot-shoe and a plug on the front-left for coupling of the Olympus flash group's TTL connector cable (previously the OM-2N MD series required removal of