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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, 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 camera 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. (1) Try not to shoot the hot sun directly. When using the digital camera, try not to shoot the sun or strong light directly. Although the SLR camera only needs to press the shutter to expose, the strong light has little effect on the sensor, but it is very difficult to face the strong light for a long time. The camera's metering system may be damaged. The optical path of the card camera is directly facing the light source, and the sensor is always in working state. The sensor will be aged when facing the sun for a long time, so try not to try to shoot the sun, especially the scorching sun at noon. (2) The "sleep" function of the card camera is turned on, and the retractable lens is very fragile for a card camera with a retractable lens. It is recommended to turn on the "sleep" function of the camera, so that no operation is performed for a period of time. The rear lens can be automatically retracted, and the built-in lens cover will be closed to prevent the lens from being damaged and deformed by unintentional bumps. Touch the shutter to return to the shooting state. (3) Do not unscrew the lens from the fuselage frequently outdoors. Dust will inevitably enter outdoors. When changing the lens, try to do it indoors when there is not much dust. The lens cannot be changed just after sweeping the floor or just after folding the quilt.