What are the different roll lengths for microfilm? What are the advantages and disadvantages of each roll length?
16mm microfilm comes in rolls that are either 100 ft. x 5ml thick, or 215 ft. x 2.5 ml thick. 35mm microfilm comes in 100 ft x 5ml thick rolls. Advantages of using 215 ft.- length rolls of film are that it doubles the number of document images that can be exposed on a roll, and the film roll can fit onto the same spool as 100 ft. film. Disadvantages of using 215 ft.- length rolls of film are that it takes longer to retrieve an image at the end of the roll, and that because the film is thinner, it has a tendency to tangle into knots.
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