Aperture

A photographer captures sunset at the needles during sunset in Cannon Beach, Oregon.

Aperture
1. An opening, such as a hole, gap, or slit.
2. A usually adjustable opening in an optical instrument, such as a camera or telescope, that limits the amount of light passing through a lens or onto a mirror.
3. The diameter of such an opening, often expressed as an f-number.

This image won first place in the Light contest at DPChallenge: http://www.dpchallenge.com/image.php?IMAGE_ID=141895

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