Banana Fairy's Camera
From the Super Mario Wiki
The Banana Fairy's Camera is the magical camera that players receive from the Banana Fairy Princess in Donkey Kong 64. The purpose of the camera is to take pictures of the Banana Fairies. It is the only method to catch Banana Fairies, as it traps them inside special banana skin photographs. The camera is fueled by Banana Camera Film. The more pictures the players take of Banana Fairies, the more secrets and extras they unlock in the game. Any Kong can use the camera.
It is used by first holding , then pressing , and finally pressing to snap a photo.