How to classify cameras?

According to the different imaging media, cameras can be divided into film cameras, digital cameras and Polaroid cameras. Film camera mainly refers to the equipment that images through lens and records images with film. Digital camera is a photographic equipment that uses semiconductor photoelectric coupling devices and digital storage to record images. It has the characteristics of convenient use, convenient photo transmission and convenient storage. Polaroid camera, also known as primary imaging camera, directly exposes images on special photographic paper, and can see photos in one minute, which is suitable for taking pictures. 2. According to the film and frame size used by cameras, they can be divided into 35mm cameras (usually called 135 cameras), 120 cameras,10 cameras, 126 cameras, medium-sized cameras, large cameras, APS cameras and miniature cameras. 135 camera uses 35mm film, and its standard frame is 24mm X 36mm. Generally, 36 or 24 shots can be taken per film. 3. According to the appearance and structure of the camera, it can be divided into head-up viewfinder camera and single-lens reflex camera. In addition, there are folding cameras, double-lens reflex cameras, rangefinder cameras, conveyors, landlines and so on. 4. According to the shutter form of the camera, it can be divided into lens shutter camera (also called center shutter camera), focal plane shutter camera and program shutter camera. 5. According to the function and technical characteristics of the camera, it can be divided into autofocus camera, electro-optic manual exposure camera and electro-optic automatic exposure camera. In addition, there are shutter priority, aperture priority, program control, double priority, electric film winding (automatic film winding and rewinding) camera, automatic focus (AF) camera, date back camera, built-in flash camera and so on. Sometimes it can also be divided according to the use of cameras, such as professional cameras and consumer cameras (fool cameras), one-step imaging cameras and stereo cameras; Sometimes it can also be divided into zoom or bifocal cameras according to the characteristics of the lens. In fact, a modern camera often has many characteristics, so it should be defined comprehensively.