According to rough estimates, in 37 years, Chen has repaired about 80,000 film cameras from different places and most of which were sent to him by customers after contracting him online.

At first, Chen could repair more than ten cameras in one day, but since there are more types and complex internal structures of camera, he has to make every part needed and can repair only four cameras in one day. He said that each camera is precious to its owner, and he must repair it carefully.