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BSI BS ISO 517:2008

Photography. Apertures and related properties pertaining to photographic lenses. Designations and measurements
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BSI BS ISO 517:2008

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

PUBLISH DATE 2008
PAGES 16
BSI BS ISO 517:2008

This International Standard pertains to apertures and related properties of photographic lenses affecting the illuminance at the centre of the image.

This International Standard 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.

This International Standard applies only to lenses focused on objects at infinity; that is, at least 50 times the focal length of the lens.

SDO BSI: British Standards Institution
Document Number ISO 517
Publication Date June 30, 2008
Language en - English
Page Count
Revision Level
Supercedes
Committee CPW/172
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