Understanding Exposure in Photography

A long shutter speed is good for stopping action.

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A focal point is a natural resting place for the eye (usually the main subject) in a composition. 

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The empty area or seemingly unimportant background area, in an artwork is called positive space. 

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Underexposure is when an image that appears too light.

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Shutter Speed controls how long that light can pass through the camera lens.

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The amount of light that reaches the image sensor is controlled by a combination of the lens aperture and shutter speed.

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Aperture is the diameter of the lens opening.

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ISO is the sensitivity of the image sensor or film.

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When taking a portrait photo and blurring the background you need a an aperture of f/16 or higher.

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To capture something moving quickly, a shutter speed of 1/600 or higher is needed.

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