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U D C 771.35136
IS0
ORGAN I ZATl O N FOR STA N DARD I ZATl O N
I N TE R N AT1 O NA L
IS0 RECOMMENDATION
R 516
EXPOSURE-TIME MARKINGS FOR SHUTTERS
USED IN 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
of ISO.
a member
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
be obtained through the national standards organizations.
Also issued in French and Russian. Copies to
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BRIEF HISTORY
The IS0 Recommendation R 516, Exposure-time Markings for Shutters Used in 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. 423) was circulated to all the IS0
Member Bodies for enquiry. It was approved by the following Member Bodies:
Belgium 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 Coun-
cil, which decided, in November 1966, to accept it as an IS0 RECOMMENDATION.
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ISO/R 516 - 1966 (E)
IS0 Recommendation R 516 November 1966
EXPOSURE-TIME MARKINGS FOR SHUTTERS
USED IN STILL CAMERAS
FOREWORD
This IS0 Recommendation is intended to provide a uniform basis for determining and marking
the exposure times on all ty
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