Aperture lens opening
The opening in a camera lens through which light passes to expose the film. The size of aperture is either fixed or adjustable. Aperture size is usually calibrated in f-numbers.
F-stop (f-number). A numerical designation (f/2, f/2.8, etc.) indicating the size of the aperture lens opening.
Grain. The particles of silver that make up a photographic image.
 See also: Coated, Shooting, Rewind, Photograph, Lapping
  
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