When was the master camera introduced to China?

1874, Jules Jean Sang of France invented the camera. He wound the photosensitive film on a toothed film supply reel. Under the control of the pendulum mechanism, the film supply tray moves intermittently in the circular film supply box, and the pendulum mechanism drives the shutter to rotate. Every time the film stops, the shutter will open for exposure. Janssen connected this camera to a telescope, which can take a set of photos of planetary motion at the speed of one per second. Janssen named it a photographic gun, which is the originator of modern movie camera +Y6R. 1882, Jules Marie of France invented a camera, which can be used to photograph the coherent movements of birds, thus giving birth to photography technology. This camera is shaped like a gun. A round box similar to a large magazine is fixed at the trigger, and a large caliber barrel is installed in front. A glass photosensitive disc coated with silver bromide emulsion is installed in the round box. When shooting, the photosensitive disc intermittently moves in a circle, and the shutter is coaxial with the photosensitive disc and keeps rotating, blocking and absorbing the light beam passing through the lens. The whole machine is driven by a clockwork. You can take photos with the exposure speed of1100 seconds and the frequency of 12 photos per second. 1888, Marley invented a new camera. He replaced the fixed photosensitive disc with a photosensitive paper tape wound on the shaft. When the photosensitive paper tape passes through the focus of the lens, two color grasping mechanisms fix the photosensitive paper tape to expose it. Later, Marley replaced the photosensitive paper tape with photosensitive film. Marley's camera has been continuously improved, and finally it can shoot at a frequency of 60 shots per second on a 9 cm wide film. 1889, Edison in America invented the camera. This camera is driven by a pointed roller 19 mm wide non-porous adhesive tape. Under the control of the ratchet wheel, the adhesive tape is driven to move intermittently and punch holes at the same time. This camera is driven by a motor, the shutter shaft is linked with the phonograph, and the phonograph records the sound when the camera is running. On this basis, the mobile camera was invented. There is a cross wheel mechanism in the camera to control the intermittent motion of the film, and another gear drives the film forward. This camera uses 35 mm perforated film.