Definition: The adjustable opening in the lens used to allow light onto the film or digital surface. The size of the aperture is measured by the F-Stop setting. The larger opening of the aperture results in less light needed to expose the image and less depth of field (less in focus). A smaller opening of the aperture results in more light needed to expose the image and more depth of field (more in focus).
Common Misspellings: apature, aparture
