Magazine article American Cinematographer

Questions & Answers

Magazine article American Cinematographer

Questions & Answers

Article excerpt

(Inquiries are invited relating to cinematographic problems. Address: Q. & A., AMERICAN CINEMA TOGRAPHER, P O. Box 2230. Hollywood, Calif. 9O028.)

Q In part three of question one in the September, 1978 issue of AMERICAN CINEMATOGRAPHER you were asked about the old Wall and Mitchell 35mm single-system optical cameras. The question was about projection sync. This was one of the many answers we received.

A According to the specifications of the Wall camera (designation A-9), it is constructed so that the sound track "leads" the picture by 11 frames or 44 sprocket holes. Reversal film exposed by this camera would not be in proper projection position after developing, as it would require a nine-frame advance in the printing to make this possible.

In the instance of a 35mm Mitchell camera, factory specifications indicate that the distance between the center of the picture and corresponding sound is 20 frames, or correct projection distance. If measurements were taken from the bottom of the camera aperture in either the Wall or the Mitchell, one-half frame distance would have to be added.

To use the single-system designation isn't necessarily correct, as the Mitchell Camera Company put out an "SS" designated single-system camera for military use that differed from a standard "NC" Mitchell for which a galvanometer was added after the camera was built so it could be used for sound work, but the galvanometer in the "SS" was standard equipment, original manufacture.

One other bit of news for what it might be worth. …

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