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IS0
FOR STA N DAR DI ZATl ON
I NTERN AT1 ON A L O RG A N IZATl O N
IS O R EC O M M EN DATI O N
R 517
LENS APERTURE MARKINGS FOR STILL CAMERAS
1st EDITION
November 1966
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 517, Lens Aperture Markings for Still Cameras, was drawn
up by Technical Committee ISO/TC 42, Photography, the Secretariat of which was held by the
American Standards Association, Inc. (ASA).
Work on this question by the Technical Committee began in 1955 and led, in 1959, to
the adoption of a Draft IS0 Recommendation.
In August 1961, this Draft IS0 Recommendation (No. 424) was circulated to ail the IS0
Member Bodies for enquiry. It was approved by the following Member Bodies:
Be 1 g i u m Italy Switzerland
Brazil Japan United Kingdom
Canada Netherlands U.S.A.
Chile New Zealand U.S.S.R.
France Romania
Germany Sweden
No Member Body opposed the approval of the Draft.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in November 1966, to accept it as an IS0 RECOMMEN
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