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
30-06-2008
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
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