BS ISO 517:2008
Current
The latest, up-to-date edition.
Photography. Apertures and related properties pertaining to photographic lenses. Designations and measurements
Hardcopy , PDF
English
06-30-2008
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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.
| Committee |
CPW/172
|
| DocumentType |
Standard
|
| Pages |
16
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
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.
| Standards | Relationship |
| ISO 517:2008 | Identical |
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