Before the days of LCD displays, the only way you could keep track of what speed film you had in your camera was to remember it, select a dial on the camera, or cut out a piece of the film box and place it in a designated area on the back of the camera.
However, not all cameras have ISO dials or places to put a note; and even if they do, some have a limited range of ISO labels to choose from. To remedy this problem, photographer Guy Sie... more