The Pen EE-3 is a rugged little half-frame camera. Like all half-frame cameras, you get two pictures on a single 24 × 36 mm frame or, if your lab is generous, even two pictures on your print. The EE-3 is equipped with a fully-automatic exposure feature and the EE stands for Electronic Eye. It measures the available light with its selenium cell meter around the lens and chooses between two shutter speeds: 1/125th and 1/30th of a second. The aperture is fixed via the ISO/ASA rating of the film. For flash photography, the aperture can be set manually.