also: アパーチュア · アパーチャー
A technical term used in optics, photography, and physics to refer to an opening that controls the amount of light passing through a lens or optical system.
Adjust the camera's aperture to change the depth of field.
The maximum aperture of this lens is f/2.8.
Borrowed from English 'aperture'. The variant spellings reflect different attempts to transcribe the English pronunciation into katakana.