What is the small gun in the photographer's mouth? Is it a camera or an accessory? Thank you very much.

The nickname of camera lens generally refers to the telescope head with medium and long focal length. For example, the first generation of Nikon's 70-200/2.8G is called a small bamboo gun, the second generation is called a big bamboo gun, and the third generation is called an electromagnetic gun. The earlier film era, 80-200/2.8D, was called steel cannon and big steel cannon respectively. Generally, a large aperture fixed-focus lens with a focal length of more than 300mm is called "cannon", which is often the favorite of professional sports photographers and birds.