1、 1 Scope This standard specifies the cutting and perforating dimensions for 35-mm motion-picture film having two rows of 16-mm type perforations, one row near each edge of the 35-mm film, and a perforation pitch of either 0.2994 in or 0.3000 in (7.605 mm or 7.620 mm). The width of the 16-mm strip af
2、ter processing and slitting is also specified. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parti
3、es to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. SMPTE 223M-2001, Motion-Picture Film Safety Film 3 Dimensions 3.1 The dimensions shall be as given in figure 1 and table 1. 3.2 The dimensions pe
4、rtain to a safety film as defined in SMPTE 223M. 3.3 Except for dimensions A and E, the dimensions apply at the time of cutting and perforating for film adjusted to a temperature of 23C 1C (nominally converted to 73F 2F) and a relative humidity of (50 2)%. The manufacturer may indicate other nominal
5、 temperature and humidity conditions under which the dimensions apply. Dimensions A and E apply immediately after slitting. 3.4 Notwithstanding accumulation of tolerances, dimensions A and E shall be as specified. NOTES 1 The title of this standard was established by the application of a nomenclatur
6、e system developed for all film dimension standards. Each title provides an indication of the film width, a code designation for the perforation shape (BH, KS, DH, or CS), or the number of rows of perforations (1R, 2R, etc.), depending upon which is the significant factor, or the perforation pitch w
7、ithout the decimal point. 2 The metric conversion of dimension A is purposely chosen and shown to three decimal places to prevent the maximum width dimension from exceeding 35 mm. 3 Dimension A represents the film width and dimension E the edge-to-perforation distance after slitting a nominal 16-mm
8、strip from the exposed and processed parent 35-mm width film. In deriving the dimension of 0.627 in (15.93 mm), the specified film shrinkage characteristics described in annex A.2 have been taken into account. Page 1 of 3 pages SMPTE 73-2003 Revision of ANSI/SMPTE 73-1998 Copyright 2003 by THE SOCIE
9、TY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100 Approved November 12, 2003 SMPTE STANDARD for Motion-Picture Film (32-mm) 35-mm Film Perforated 32-mm, 2R SMPTE 73-2003 Page 2 of 3 pages Figure 1 Dimensions Table 1 Specifications Dimensions I
10、nches Millimeters A Film width 1.377 0.001 34.975 0.025 A Film width after processing and slitting 0.627 0.002 15.93 0.05 B Perforation pitch (long) 0.3000 0.0004 7.620 0.010 B Perforation pitch (short) 0.2994 0.0004 7.605 0.010 C Perforation width 0.0720 0.0004 1.829 0.010 D Perforation height 0.05
11、00 0.0004 1.270 0.010 E Edge to perforation 0.096 0.002 2.44 0.05 E Edge to perforation after processing and slitting 0.0355 0.0020 0.902 0.051 G Perforation misalignment 0.001 max 0.03 max L 100 consecutive perforation pitches (long) 30.00 0.03 762.0 0.8 L 100 consecutive perforation pitches (short
12、) 29.94 0.03 760.5 0.08 M Lateral perforation displacement 1.113 0.001 28.27 0.03 R Radius of perforation fillet 0.010 0.001 0.25 0.03 SMPTE 73-2003 Page 3 of 3 pages Annex A (informative) Additional data A.1 The user is reminded that, as a plastic, film can change dimensions temporarily due to mois
13、ture or temperature, or permanently due to solvent loss or strain effect. A.2 Film for positive use has a longitudinal pitch of 0.2% longer than its companion negative. Shrinkage of the negative during aging and processing prior to printing will generally not exceed 0.2%. Thus, the negative stock is
14、 expected to be 0.3% 0.1% shorter than the positive. This difference will minimize slippage between the two on the 12-inch (305-mm) circumference sprocket of the printer, assuming a film thickness of 0.0055 in to 0.0065 in (0.140 mm to 0.165 mm). A.3 The uniformity of pitch, hole size, and margin (d
15、imensions B, C, D, and E) is an important variable affecting steadiness. Variations in these dimensions, from roll to roll, are of little significance compared to variations from one perforation to the next within any small group of consecutive perforations. As an example, the uniformity of the marg
16、in is uniquely critical for optical printing. During the printing process, the placement of the image on the film is usually with respect to successive lateral pairs of perforations at one-frame intervals. During subsequent projection, however, the portion of the image projected is usually located, not by these perforations, but by the edge of the film. The lateral steadiness of the projected image is, therefore, directly related to the frame-to-frame uniformity of the margin.
