Amateur photographer Tang Shengnan decided to shoot his video of the Expo 2010 Shanghai after meeting elderly people in the city's nursing homes, who have been too intimidated to visit the event because of the heat and crowds.

Tang, 65, said he made up his mind to make the 29-minute short movie after visiting his sister's home and being greeted by a sea of bored faces.

Tang visited the Expo Garden five times to collect footage for his documentary, which he kept short. He queued for hours to get into the most popular pavilions, even though they may only appear in the film for a couple of seconds.

He spent 2,000 yuan of his own money making 300 copies of the film, and delivered them himself on his bicycle.

He has shown the movie to thousands of aging Shanghai locals in 10 homes, but he feels frustrated that he cannot do more.

Tang used to shoot beautiful brides and wedding ceremonies. Now he feels he is playing a more socially responsible role while showing others what is possible.

Video: Huang Lan