The aperture of an optical system is the opening that limits the amount of light that can pass through.

Aperture may also refer to:

Science and technology

• Aperture (antenna), a physical parameter of an antenna
• Aperture (mollusc), the main opening in the shell of a gastropod or scaphopod (mollusc)
• Aperture (botany), a weaker spot in the wall of a pollen grain
• Numerical aperture is a parameter used to describe optical systems

Computers

• Aperture (computer memory), a region of the physical address space that opens access to a particular device or memory unit
• Aperture (software), an image organization and editing program for photographers, sold by Apple Inc.

Other

• Aperture (typography), an enclosed loop in a typographical symbol - such as the lower part of the letter 'a'
• Aperture (magazine), a long-running art photography magazine

See also

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