I want to ask how the camera is aimed at a focus.

When the camera is aimed at the subject, the camera itself automatically focuses without manual adjustment by the photographer. This is the automatic focusing device (AF). The autofocus device has four working modes, namely infrared or ultrasonic. After the object returns, it is received by the infrared sensor or ultrasonic sensor of the camera, and the distance is measured, and then the focusing device of the camera is driven to focus according to the measured distance. The latter two methods are to measure the distance between the camera and the object based on the triangulation principle by using the rangefinder, and then input the measured distance into the microprocessor in the camera for calculation, and control the focusing motor of the lens to focus according to the calculated distance.

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