Aperture- A space through which light passes in an optical or photographic instrument
Shutter- This is like a curtain for a curtain
Exposure- The subjecting of light rays reflected or transmitted by a subject being
photographed, under controlled conditions of time and intensity.
Depth of field- The distance between the nearest and the furthest objects that give an image judged to be in focus in a camera.
F-Stop- In optics, the f-number of an optical system is the ratio of the lens focal lenth to the diameter of the Entracnce pupil. It is a Dimensionless number that is a quantitative measure of lens speed, an important concept in photography.
Focal Length- The distance between the center of a lens or curved mirror and its focus.
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