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The Exposure Triangle

12:38 PM - July 8, 2014 by Dan Makela

The three factors that you need to think about when trying to get the correct amount of light in your camera to take a well-lit photograph – ISO, aperature, and shutter speed - are sometimes called the “exposure triangle.” These three elements interact with one another to determine how much light gets to the photograph.

Imagine you’re in a room with a window with shutters that open to let light in.

The window itself is the aperature. Bigger window, more light. Smaller window, less light.

How long you open the shutters is the shutter speed. Open them longer, and more light comes in.

ISO is how wide your eyes are open. If you squint, hold your hands in front of your face, or wear sunglasses, less light comes in.

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