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About This Item

 

Full Description

ISO 517:2008 pertains to apertures and related properties of photographic lenses affecting the illuminance at the centre of the image.

ISO 517:2008 specifies aperture markings for all types of lenses used in still cameras, and gives tolerances for the stop numbers. It also defines aperture stop, entrance pupil, focal length, relative aperture and stop numbers, and gives methods for their measurement or determination.

ISO 517:2008 applies only to lenses focused on objects at infinity; that is, at least 50 times the focal length of the lens.

 

Document History

  1. ISO 517:2008

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    Photography - Apertures and related properties pertaining to photographic lenses - Designations and measurements

    • Most Recent
  2. ISO 517:1996


    Photography -- Apertures and related properties pertaining to photographic lenses -- Designations and measurements

    • Historical Version