![]() In 1930 Zeiss introduced cameras using two red windows for 127 roll-film. It employed two red windows where film with standard numbering on the backing paper was advanced so that each number appeared in each window successively. ![]() The Ensign Cupid, 1922, was probably the first camera to use the 'double window' arrangement for doubling the number of exposures on a roll. He describes camera backs having two red windows or film with intermediate marks on the backing paper, masks for the focal plane and view-finder are also described. The idea for doubling the number of exposures on a roll of film came from W.H. Position' shows the frame number position as if the film is being wound to the right.įilm numbers were not allocated until 1912. Sizes in the left column are in inches, the width (across the spool) is given first. Standard Film and Plate Sizes Roll-Film Kodak Roll-Film Sizes
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