SPF - aperture

SPF this week is brought to you by with the help of Dictionary.com1. ap·er·ture n.

1. An opening, such as a hole, gap, or slit.
2. 1. 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.
   2. The diameter of such an opening, often expressed as an f-number.
   3. The diameter of the objective of a telescope.

1. A wide open space. Evan and I at Pike's Peak, 2002. 2. Brightness. Today's Texas sky.

3. In the dark. Cedar Park fireworks 2005. Picasa makes these cute collages.

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