Banana Camera Film
From the Super Mario Wiki
Banana Camera Film are collectible film rolls that power the Banana Fairy's Camera in Donkey Kong 64. The Kongs can only collect and use them after Tiny Kong meets the Banana Fairy Princess, who provides her with the camera. One Banana Camera Film is used up each time they take a photograph from it.
The Kongs could initially equip up to ten Banana Camera Films at a time. If the Kongs capture a photo of a Banana Fairy with the Banana Fairy's Camera, the fairy increases their maximum Banana Camera Film supply by one. The Kongs can carry up to thirty Banana Camera Films after they have captured a photo of all twenty Banana Fairies.