APERTURE: Adjusting of the photographic lens to control the amount of light that is allowed to reach the film or image sensor.
SHUTTER SPEED (EXPOSURE TIME) : The amount of time the shutter is open when taking a picture. This is proportional to the amount of light that reaches the film or image sensor.
ISO FILM SPEED: measure of a photographic film's sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system. A closely related ISO system is used to measure the sensitivity of digital imaging systems.
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