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At an aperture of f/16, the portion from about 4.5 to 60 feet (1.4 to 18.3 m) will be in focus. At an aperture of f/5.6, the portion of your scene from about 6.5 to 11 feet (2.0 to 3.4 m) will be in focus. To demonstrate, turn the distance ring to 8 feet (2.4 m) and look at the red markers. A smaller aperture will let less light onto the film, and give more depth of field. less of your scene in focus), and more light being let onto the film.

A larger aperture ( smaller number) means less depth of field (i.e.

A full explanation of these functions is beyond the scope of this article, but some brief reminders can be given here: If you have a light meter, use it if not, experiment.