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ISO 4238:1976
M00003476
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ISO 4238:1976 Cinematography -- Optical printing ratios for enlargement and reduction of motion-picture film images -- Specifications
standard by International Organization for Standardization, 12/01/1976
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This International Standard specifies the required ratios for optical enlargement and reduction of motion-picture film images in intermittent and continuous printing operations in transferring film formats from one to another.