The Pentax K1000 35mm SLR is one of photography's greatest, most popular and longest-lived cameras. This Pentax film camera is completely mechanical and needs no battery to run, however, you must purchase an A76 cell battery to run the light meter. Unlike other SLR and DSLR cameras, the K1000 is simple and has little to no learning curve. There is three shooting controls: aperture, shutter speed and focus. You set the film speed when you load it. An extraordinary simple camera that forces you to think about your picture instead of your camera. As a result, it's recommended by most photography teachers, instructors, and professors to be used in their classes. The Pentax K1000 is so brilliant that you never need to turn the meter or camera on or off: both are always on for instant picture taking