This allowed the user to take a number of spot meter readings, all of which were used by the camera to calculate the correct exposure.

The system also featured "highlight" and "shadow" buttons which allowed the photographer to identify parts of a scene that should be exposed as white or black respectively.

The metering system used a liquid crystal display in place of the older match needle design of the OM-1 and OM-2.

Other refinements were also present, including a faster maximum shutter speed of 1/2000 second and a built in flash hot shoe.

This may be because the OM-1n remained in production and offered an alternative mechanical body for the OM system at a fraction of the price, albeit with less sophisticated metering.