Aperture - an opening, usually circular, that limits the quantity of light that can enter an optical instrument.
Shutter - a mechanical device for opening and closing the aperture of a camera lens to expose film.
Exposure - the act of presenting a photosensitive surface to rays of light.
Depth of field - the range of distances along the axis of an optical instrument, usually a camera lens, through which an object will produce a relatively distinct image.
F-stop - the setting of an adjustable lens aperture, as indicated by an f number.
Focal length - the distance from a focal point of a lens or mirror to the corresponding principal plane.
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