Aperture: An opening, hole, or gap.
Shutter: A device that opens and closes to expose the film in a camera.
Exposure: The quantity of light or other radiation reaching a photographic film as determined by shutter speed and lens aperture.
Depth of field: The distance between the nearest and the furthest object that give an image judged to be in focused in a camera.
Focal length: The distance between the center of a lens or curved mirror and its focus.
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