Exposure Triangle

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Exposure Triangle

The three main elements that include the Exposure Triangle would be Shutter speed, Aperture, and ISO.
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Shutter speed

determines how long the shutter stays open as the picture is taken. Shutter speeds are in seconds or fractions of a second. Each speed number halves the amount of light of2, 1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125, 1/250, 1/500, 1/1000, 1/2000, 1/4000, 1/8000 .
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Aperture

an open, hole, or a gap.

A space thru which light passes throught that one spot.

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ISO

photographs is the sensitivity of your image senor or film inside your camera. This measure of sensitivity is expressed as ISO speed and it's kind of a big deal when your light is less than ideal.
Understanding Exposure: The Exposure Triangle with Mark Wallace