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UDC 778.5
IS0
FO R STAN DARD I ZAT I O N
I NT ERN AT1 ON A L O RG A N I Z AT1 O N
IS0 RECOMMENDATION
R 491
CUTTING AND PERFORATING DIMENSIONS
FOR 35 rnrn MOTION-PICTURE RAW STOCK FILM
1st EDITION
July 1966
COPYRIGHT RESERVED
IS0 Recommendations and IS0 Standards
The copyright of
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
Copies to be obtained through the national standards organizations.
Also issued in French and Russian.
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BRIEF HISTORY
The IS0 Recommendation R 491, Cutting and Perforating Dimensions for 35 mm Motion-
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 to the adop-
tion of a Draft IS0 Recommendation (No. 71) which was circulated to all IS0 Member Bodies
in 1955.
W
In that same year, the Technical Committee decided to withdraw this Draft and to pre-
pare a more comprehensive document. This work led to the adoption of a second Draft IS0
Recommendation (No. 636) in 1961, which was circulated to all IS0 Member Bodies in No-
vember 1963 and approved by the following Member Bodies:
Belgium Germany Romania
Brazil Greece Spain
Bulgaria Hungary Sweden
Canada Italy Switzerland
Chile Japan United Kingdom
Colombia Korea, Rep. of U.S.A.
Czechoslovakia Netherlands
Denmark New Zealand
Two Member Bodies opposed the approval of the Draft: France, U.S.S.R.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council
which decided, in July 1966, to accept it as an IS0 RECOMMENDATION.
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ISO/R 491 - 1966 (E)
IS0 Recommendation R 491 July 1966
CUTTING AND PERFORATING DIMENSIONS
FOR 35 mm MOTION-PICTURE RAW STOCK FILM
O
O
O O
O O
O
O
Io
O
10
TYPES OF PERFORATIONS
TYPE 2
TYPES 1 and 1A
O O
'$
"t
TYPES 3 and 3A ro
O
OI O
TYPE5
yL-l TYPE4
O
O O
O O
O
O
O
O
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ISO/R 49l - 1988 (E)
TABLE 1. - Dimensions in millimetres
Dimen-
TYPE l(*) TYPE 1A(') TYPE 2
sion
A 34.975 f 0.025 34.975 f 0.025 34.975 f 0.025
4.75 f 0.01
B (4)4.74 f 0.01 4.75 f 0.01
+ 0.005 + 0.005 + 0.005
C (5) 2.800 (5) 2.800 (5) 2.800
- 0.015 - 0.015 - 0.015
+ 0.015
D 1.98 f 0.01
1.98 f 0.01 (5) 1.850
- 0.005
0.10 max.
0.10 max. 0.10 max.
3 (Ex-Es
F 25.37 f 0.05 25.37 f 0.05 25.37 f 0.05
G 0.025 max. 0.025 max. 0.025 max.
H
R 0.50 nominal 0.50 nominal 0.33 nominal
475.0 f 0.4 ("474.0 f 0.4 475.0 f 0.4
:3) L
Dimen-
TYPE 3
TYPE 3A TYPE 4 TYPE 5
sion
34.975 f 0.025
34.975 & 0.025 341975 f 0.025 34.975 f 0.025
4.75 f 0.01
(4)4.74 f 0.01 4.75 f 0.01 4.75 f 0.01
+ 0.005 + 0.005
(5) 2.800
(5) 2.800 1.98 f 0.01 1.98 & 0.01
- 0.015 - 0.015
+ 0.015 + 0.015 + 0.015
(5) 1.850
(5) 1.850 1.98 f 0.01 (5) 1.850
- 0.005 - 0.005 - 0.005
0.10 max.
0.10 max. 0.10 max. 0.10 max.
25.37 f 0.05 25.37 f 0.05 26.65 f 0.05
26.65 f 0.05
0.025 max. 0.025 max. 0.025 max. 0.025 max.
-
2.08 nominal
2.08 nominal
0.33 nominal 0.33 nominal
475.0 f 0.4
(3474.0 f 0.4 475.0 f 0.4 475.0 f 0.4
These dimensions apply to raw stock film immediately after cutting and perforating.
(9 This type of perforation is recognized as preferred and should replace types 2 and 3 in the future.
(3 Difference between E, and E,.
C) Dimension L represents the length of any 100 consecutive perforation intervals.
(4) These dimensions are for low-shrink film base and may be used for the reasons given in Annex B.
(") These millimetre dimensions are shown with unequal tolerances so that a nominal value is expressed such that no
digit other than zero occurs beyond the one-hundredth millimetre place; the maximum and minimum values, never-
theless, are the same as those for the inch dimensions.
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ISO/R 4Sl - 1986 (E)
TABLE 2. - Dimensions in inches
Dimen-
TYPE lA(’) TYPE 2
TYPE 1C.)
sion
1.377 f 0.001 1.377 f 0.001
A 1.377 f 0.001
(4) O. 1866 f 0.0004 0.1870 f 0.0004
B O. 1870 f 0.0004
0.1 100 f o.Oo04 O. 1100 Z!Z 0.0004 o. 1100 f 0.0004
C
0.0780 f 0.0004 0.0730 f 0.0004
D 0.0780 f 0.0004
0.004 ma. 0.004 max.
0.004 max.
0.999 f 0.002 0.999 f 0.002
F 0.999 f 0.002
0.001 max. 0.001 max.
G 0.001 max.
- -
-
H
R 0.020 nominal 0.020 nominal 0.013 nominal
18.70 f 0.015 (4) 18.66 f 0.015 18.70 f 0.015
3, L
Dimen-
TYPE 3A TYPE 4 TYPE 5
TYPE 3
sion
1.377 f 0.001 1.377 f 0.001
1.377 f 0.001 1.377 f 0.001
A
0.1870 f 0.0004 0.1870 f 0.0004
B O. 1870 f 0.0004 (4) O. 1866 f 0.0004
0.1 100 f 0.0004 0.0780 f O.ooo4 0.0780 f 0.0004
C 0.1100 f 0.0004
0.0730 f 0.0004
D 0.0730 f 0.0004 0.0730 f 0.0004 0.0780 f 0.0004
0.004 max. 0.004 max.
L)(E1-E,
...