Today, 71 years ago, on March 31, 1954 (February 27, 1954), the new Leica 35mm camera was put into service. On March 31, 1954, a completely different 35mm new camera was now in use. This camera has many advantages that other cameras do not have, the most important of which is the single window view, the viewing range in the viewing as seen by the naked eye. Among the many advantages is also the camera head locking device, which can make the replacement of the lens faster, and the use of rollers instead of the old rollers. The new camera has a speed range of 1/10 seconds to 1/1000 seconds, no longer using the two scale discs on the door. An exposure distance table can be used from the choice of fast door speed. Experts say that this type of camera, simply for quick and easy photography, opens a new era.