A camera is a device that uses the principle of optical imaging to form an image and use a film to record the image. It is an optical device used for photography. In modern social life, there are many devices that can record images,hunting trail camera， and they all have the characteristics of cameras, such as medical imaging equipment, astronomical observation equipment, etc.
After the light reflected by the photographed scene is focused by the photographic lens (photographic objective lens) and the shutter that controls the exposure, the photographed scene forms a latent image on the photosensitive material in the dark box, and is processed (ie, developed and fixed) to form a permanent image. This technique is called photography, which is divided into general photography and professional photography.
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