aperture

/'æpətjuə/

Thân thiện

A photographer adjusts the aperture on her camera lens.

Definition

1. Noun:
   • A man-made opening; usually small: An aperture is a hole or gap that has been created intentionally, typically of limited size.
   • A natural opening in something: An aperture can also refer to a natural hole, gap, or passage within an object or organism.
   • A device that controls the amount of light admitted: In optics, particularly in cameras and telescopes, an aperture is a mechanism that adjusts the size of an opening to regulate the light entering the system.

Usage Examples

• Man-made opening:
  • The aperture in the wall allowed a sliver of light into the dark room.
  • The craftsman drilled a small aperture for the wire to pass through.
• Natural opening:
  • The aperture of the cave was hidden by thick vines.
  • Botanists study the aperture in pollen grains.
• Optical device:
  • For a brighter image, use a wider aperture setting on your camera.
  • The telescope's aperture can be adjusted to reduce glare.

Advanced Usage

• "Numerical aperture": A technical term in microscopy and optics describing the range of angles over which a system can accept or emit light.
  • A lens with a high numerical aperture can collect more light and provide better resolution.
• "Aperture synthesis": A technique in radio astronomy where multiple small telescopes are combined to simulate a much larger aperture.
  • Aperture synthesis allows astronomers to create detailed images of distant celestial objects.

Variants and Related Words

• Apertured (adj): Having an aperture or apertures.
  • The apertured membrane allows for selective filtration.
• Apertural (adj): Relating to an aperture.
  • The apertural characteristics are key to identifying this species of shell.

Synonyms

• Opening: A gap or hole that allows passage.
• Orifice: A formal term for an opening, especially one in the body.
• Gap: A break or space between two objects.

Related Phrases

• "Stop down the aperture": To decrease the size of the aperture opening in a lens.
  • To increase the depth of field, you need to stop down the aperture.
• "Maximum aperture": The widest possible opening of a camera lens.
  • This lens has a maximum aperture of f/1.8, making it excellent for low-light photography.

Related Idioms

• "Through the aperture of": (Figurative) Viewed or understood from the perspective of.
  • Through the aperture of history, we can better understand current events.

Học thuật

Noun

1. an man-made opening; usually small
2. a natural opening in something
3. a device that controls amount of light admitted