Xihu Avenue, Shilong Town, Dongguan City, Guangdong Province. Baidu map shows that Dongguan second-hand camera trading market, established in 2003, is located in the middle section of Xihu Avenue, Shilong Town, Dongguan City, Guangdong Province. This is a big market for recycling, transforming and selling second-hand digital products. A camera, referred to as a camera for short, is a device that uses the principle of optical imaging to form an image and records the image with a negative.