The focal plane shutter consists of two curtains moving vertically or horizontally in front of the image plane. In medium format cameras with interchangeable magazines, the focal plane curtain is at the rear of the camera body and is fully exposed when the film magazine is removed from the camera. To avoid curtain damage, the camera should be stored with the magazine on the camera, and the magazine should be changed with care. Most curtains are damaged when a corner of the magazine accidentally hits the curtain.