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  • BSI
    BS ISO 517:2008 Photography. Apertures and related properties pertaining to photographic lenses. Designations and measurements
    Edition: 2008
    $319.11
    / user per year

Description of BS ISO 517:2008 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.



Standard NumberBS ISO 517:2008
TitlePhotography. Apertures and related properties pertaining to photographic lenses. Designations and measurements
StatusConfirmed
Publication Date2008-06-30
Identical National Standard OfISO 517:2008
DescriptorsLenses, Focal length measurement, Marking, Designations, Photographic equipment, Photographic lenses, Lens apertures, Camera lenses, Photography
ICS37.040.10 Photographic equipment. Projectors
CommitteeCPW/172
ISBN978 0 580 61341 8
PublisherBSI
Pages16



About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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