By far the best proof is experience.  

Sir Francis Bacon (1561 - 1626)


The opening of a lens which controls the amount of light let into the camera. The size of the aperture is controlled by the iris adjustment and measured by an f-number. The higher the f number the less light is permitted to pass into the camera. For example, a f1.2 lens will allow more light to reach the sensor and produce a brighter image than an f2.0 lens. 

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