Aperture+8

Aperture is a hole or opening through the lens which light travels through it determines the cone angle of a bundle of rays that come into focus in a image. If the aperture is narrowed, then more collimated rays are admitted. But if the aperture is wide it presents a sharp picture only for rays but blurred otherwise in the distance.
 * Aperture**

http://www.nightphotography.ca/sites/nightphotography.ca/files/Depth%20of%20Field%20Demonstration.jpg

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By: Daniel Vander Eyken