70mm is the size of the print. The film is 70mm wide.
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70 µm = 0.07 mm
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1000 mm = 1 m so 70 mm = 70/1000 = 0.07 metres. Simple!
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The common film type is a 35mm for commercial films, but film of
70 mm and greater have been used at times. Occasionally an imax
film and camera is used. This film is huge and has a rich picture
and sound quality.