Due to the backing paper being non-translucent, the photographer may load the film into the camera in subdued daylight. As images are taken, exposed film is rolled over to an identical but initially empty receiving bobbin. For cameras with simple advance mechanisms, most roll film formats have frame number markings printed on the backing paper, visible through a red window at the rear of the camera. When all images are exposed, the film is not rewound. Instead, the now empty bobbin is moved ready to become the receiver of the next roll of film.
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