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IS0
I NT ERN AT I ON AL ORGAN I Z AT I O N FOR STAND AR D I Z AT I O N
IS0 RECOMMENDATION
R 486
CUTTING AND PERFORATING DIMENSIONS
FOR DOUBLE-8 mm MOTION-PICTURE RAW STOCK FILM
1st EDITION
June 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 oniy 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 486, Cutting and Perforating Dimensions for Double-8 mm
Moiion-Picture Raw Stock Film, was drawn up by Technical Committee ISO/TC 36,
Cinematography, the Secretariat of which is held by the American Standards Association,
Inc. (ASA).
Work on this question by the Technical Committee began in 1948 and led, in 1961,
to the adoption of a Draft IS0 Recommendation.
In October 1963, this Draft IS0 Recommendation (No. 608) was circulated to all the
IS0 Member Bodies for enquiry. It was approved, subject to a few modifications of an
:
editorial nature, by the following Member Bodies
Argentina Greece Romania
Belgium Hungary Sweden
Canada Italy Switzerland
Czechoslovakia Japan United Kingdom
Denmark Korea, Rep. of U.S.A.
France Netherlands U.S.S.R.
Germany New Zealand
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 June 1966, to accept it as an IS0 RECOMMENDATION.
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F
IS0 / R 486 - 1966 (E)
IS0 Recommendation R 486 June 1966
CUTTING AND PERFORATING DIMENSIONS
FOR DOUBLE-8 mm MOTION-PICTURE RAW STOCK FILM
Dimension
millimetres I inches
*A 15.95 f 0.025 0.628 f 0.001
** B 3.81 & 0.015 O. 1500 & 0.0005
C 1.83 f 0.01 0.0720 f 0.0004
D 1.27 & 0.01
0.0500 f 0.0004
*** (E, - EJ 0.10 maximum 0.004 maximum
F 10.49 & 0.025 0.413 0.001
G 0.025 maximum
0.001 maximum
**** L
f 0.40 15.000 & 0.015
381.00
R 0.25 nominal 0.010 nominal
These dimensions apply to raw stock safety film immediately after cutting and perforating.
* This dimension applies to low-shrink raw stock safety film base, as defined in Annex B. For film base with higher
A should be 15.98f0.025 mm (0.629f0.001 in). Experience shows that it is
shrinkage characteristics, dimension
common for film to expand when exposed to high relative humidity. Allowance should be niade for this factor in
equipment design and in no case should equipment fail to accommodate a film width of 16.00 mm (0.630 in).
In the slitting of double-width film after processing, the cut should be made so that neither of the two 8-mm films
has a width more than 8.03 mm (0.316 in). It is not practicable to state precisely the resulting widths after slitting
since these will be affected not only by the tolerance on the width, dimension A, but also by the shrinkage of the
film resulting from processing.
** The tolerances of the metric and inch values of dimension B are not exactly equivalent, but the advantage of round
numbers in both systems is considered to outweigh the importance of the residual difference.
*** Difference between E, and E2.
**** Dimension L represents the length of any 100 consecutive perforation intervals.
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ANNEXES A and B iSO/ R 486 - 1966 (E)
ANNEX A
UNIFORMITY OF PERFORATIONS
The dimensions given in this IS0 Recommendation represent the practice of film manufacturers
in that the dimensions and their tolerances are for film st
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