Plural of aperture; openings or gaps, especially the opening in a lens or optical instrument that controls light.
From Latin 'apertura,' derived from 'aperire' (to open). Standard plural form of aperture.
In photography, controlling apertures through 'f-stops' is pure math magic—f/2.8 gathers more light than f/16 because the numbers describe the ratio of lens width to focal length.
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