double perf

(thing) by Film Terms Fri Apr 07 2000 at 18:16:02
Film Term:

16mm film with a row of perforations running along both edges. On the film can this will be indicated by 2R appearing on the label.

Glossary of Film Terms - http://homepage.newschool.edu/~schlemoj/film_courses/glossary_of_film_terms/
reprinted with permission

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