The camera was fully manual, with a built-in CdS light meter.

The user needed to push a button on the front of the camera to close the aperture, and then set the aperture ring on the lens to a value where the meter needle would fit inside a marker ring.

It was not possible to switch it off manually, so the only way to conserve battery would be to delay advancing the film until the next exposure.

If the user used the middle finger for the shutter release, it was possible to have an unusually solid grip on the housing.

There were a wide range of lenses, bellows and other accessories available, both from Petri and from third-party producers.