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BS ISO 517:2008

BS ISO 517:2008

Current

Current

The latest, up-to-date edition.

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

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

06-30-2008

Publisher

British Standards Institution

Foreword
1 Scope
2 Terms and definitions
3 Aperture markings
4 Tolerances of f-numbers for photographic lenses
5 Methods for measuring effective entrance pupil
  and focal length

Describes 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 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.

Committee
CPW/172
DocumentType
Standard
Pages
16
PublisherName
British Standards Institution
Status
Current

Standards Relationship
ISO 517:2008 Identical

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Hardcopy - English
PDF - English
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