According to a post on sohu.com, the three women are overseas Chinese, "returned from overseas to enjoy the beautiful scenery of the motherland. When climbing the towering and majestic Great Wall, facing the great rivers and mountains of the motherland, they couldn't help but cry out 'Motherland, I love you'." 
The camera probably is a Seagull - 海鸥 - produced in China.

Sources

https://www.sohu.com/a/652632277_121608744 (retrieved 20 July 2023)