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1000-Foot Bipack Magazine and Adapter*
BY WILTON R. HOLM AND JAMES W. KAYLOR CINECOLOR CORPORATION, BURBANK, CALIFORNIA
Summary — Users of 35-mm bipack film have been restricted to the use of 400-foot rolls of negative stock. This is because present standard photographic equipment will not handle 1000-foot rolls in the conventional-type bipack magazine. Loss of production time and excessive negative wastage, as well as severe photographic limitations, are the result.
An adapter has been developed at Cinecolor Corporation which permits the use of 1000-foot rolls of negative film in side-by-side position, rather than one over the other. This arrangement gives an attractive and convenient operating assembly, which keeps the center of gravity low. It eliminates the need for unwieldy and top-heavy blimps. The adapter causes the films to be changed from a side-by-side to the superimposed emulsion-to-emulsion relationship required in bipack photography. In the Cinecolor arrangement, the 1000-foot rolls are fed from a single 70-mm magazine into the adapter. Two individual 1000-foot magazines can be used equally well.
PRODUCERS OF FEATURE PHOTOPLAYS in a two-color process, using 35-mm bipack as a photographing medium, are restricted to 400foot lengths of picture negative film. Many disadvantages, both artistic and economic, are attendant upon this limitation. It is impossible to photograph a scene longer than 400 feet, and directors often want longer master scenes. Likewise, it is impossible to retake a scene longer than 200 feet without pausing to reload the camera. Often it becomes extremely difficult to obtain the desired dramatic interpretation of a scene when it is necessary to stop and reload after every take. From an economic point of view, this excessive reloading time represents a loss of valuable production time. An additional economic factor is one of excessive picture negative wastage, because of the number of rather long "short ends" which accumulate.1
Bipack picture negative film is manufactured in 400-foot, rather than the customary 1000-foot lengths, only because all commercially available bipack magazines for production-type cameras have a capacity of 400 feet. This is perhaps because bipack photography has developed around the use of existing black-and-white equipment.
* Presented May 18, 1948, at the SMPE Convention in Santa Monica. 58 JULY 1949 JOURNAL OP THE SMPE VOLUME 53