a
per
ture
Plural
apertures
1
the opening in a camera's lens that controls the amount of light that enters the camera and reaches the sensor or film
Aperture refers to the adjustable opening in a camera lens that controls the amount of light entering the camera. It is measured in f-stops, with smaller f-stop numbers indicating a larger opening and more light, while larger f-stop numbers mean a smaller opening and less light. Aperture also affects the depth of field, which determines how much of the image is in focus from foreground to background. Adjusting the aperture allows photographers to control exposure and the sharpness of different parts of the image.
- She widened the aperture to f/1.8 for a blurred background in her portrait.
- To capture the fireworks, he stopped down the aperture to f/11 and used a longer exposure.
- The manual lens click-stops made it easy to set the aperture precisely.
- At dusk, he opened the aperture fully to let in every last photon.
- The camera's display showed the current aperture alongside shutter speed and ISO.
2
the diameter of an optical diaphragm's opening that determines how wide a cone of light can pass through the instrument
- The telescope's 200 mm aperture gave it superior light-gathering power.
- Microscopes with larger apertures resolve finer cellular details.
- An engineer adjusted the iris diaphragm to change the system's aperture.
- The spectrometer's aperture stop defined its spectral resolution.
- Optical designers calculate aperture to balance brightness against aberrations.
3
a hole, gap, or slit in a structure or surface
- The fox slipped through an aperture in the garden fence.
- Sunlight streamed through the leaf canopy's narrow aperture.
- Moss grew around the tree's bark apertures, where water pooled.
- Divers explored the cave's underwater apertures for hidden chambers.
- The geologist examined mineral deposits around rock apertures.