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 CINEMATOGRAPHER, P.O. Box 2230, Hollywood, Calif. 90028.)

Q I wonder if you could explain the use of the various types of negatives and prints in the processing of film and the meaning of terms like "fine grain positive", "CRI", "interpositive", etc. I would especially appreciate a flow chart, verbal or otherwise, of the laboratory process.

A An appropriate answer to your question would require more space than is available in this column.

You can obtain the information and flow charts from a two-part article by Richard Patterson entitled SURVEY OF MOTION PICTURE FILM STOCKS AND LABORATORY PROCEDURES that appeared in the June and July 1971 issue of this magazine.

The same information and flow charts appear in more current version in Kodak publication #H-25 which may be obtained from the Eastman Kodak Company, Motion Picture and Education Markets Division, Rochester, New York; Hollywood, California; or other offices throughout the country. Sid Solow, CFI.

Q We have a problem regarding our background projection screen which is marked with blotches of fungus, the result of high humidity in our studio. These spots are quite obvious in shots made with this screen. We have tried to eliminate the spots with a number of different solutions, but without success. Any suggestions?

A We suggest that you wash the screen with water, using a soft bristle brush. Then give it another washing-this time with a fungicidal detergent that is soluble in water. Follow this with another washing, using the bristly brush, and rinse thoroughly, using clear water. During this procedure be sure you do not wet the top member of the screen frame, as any water dripping down from this will tend to mar the screen surface, due to accumulation of dust, etc., on frame. Also, do not allow drops of water to stand on screen surface while drying, as this will result in objectionable spotting. Absorb any water droplets with a blotter. Should this treatment fail to restore screen to usable condition, it is likely that the fungus stains have "set," and the screen must be replaced. …

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