Opening of the lens diaphragm through which light passes
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By opening the aperture of the lens, the photographer was able
to increase the photo's depth of field.
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An aperture membrane is a section of enzine forming the base of
an aperture.
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"Aperture" means "opening".
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"Aperture" is a synonym for a break or a crack. "Aperture" is
used in many modern day phrases such as camera aperture and of
course, "Aperture Science" from the game Portal.