Movie Makers (Jan-Dec 1952)

304 NOVEMBER 1952 BOLEX ACCESSORIES STEVENS Bolex Camera Accessories and Authorized Service exclusively • Battery-Operated Camera Drive • A. C. Synchronous Camera Drive • Lens Extension Tubes for Ultra Close-Ups • Double-Exposure Split-Frame Mask o Detachable Camera Base • Special 400' Magazine Installation • Alignment Gauge for Precise Framing • Cine Timer for Automatic Time-Lapse Photography • Turret Filter Slide Installation • Complete Bolex Service & Parts SOUND SPROCKETS INSTALLED OCTAMETER FINDERS INSTALLED Write for Illustrated Bolex Accessory Booklet STEVENS ENGINEERING CO. 2421 Military Ave., Los Angeles 64, Calif. KODACHROME DUPLICATES 8mm. or 1 6mm. 1 1 # per foot Mail Orders accepted HOLLYWOOD 16mm INDUSTRIES, INC. G060-A Hollywood Blvd. Hollywood 28, Calif UjE JiSjiMSymS Dress up your films with an ACL COLOR LEADER 8mm. $1.00 16mm. $1.50 Amateur Cinema League, Inc. 420 Lexington Ave., New York 17, N. Y. «* title movies in SECONDS Self flicking CUNGTITE LETTERS stick on contact with glass, metal and oil non-porous surfaces. No glue or odhesives! Letters reusable! Title on location; thru cor window with subject as background; on miffor for 3-dimensionol effect. Complete kit consists of 157 letters, numerals, figures; two title boards, 6-page idea booklet. ** with self-sticking CUNGTITE LETTERS FREE OFFER: See how CUNGTITE LETTERS simplify titling. Write today for free samples and 6-page I with nar Ctlftft>TIT£ letters 4844 S. Ashland Dept. Nl Chicago 9, III. brighter during the first hour of burning. After that the illumination gradually diminishes until the lamp burns out at the end of its 4 hour life. Thus, the guide numbers given in Table III are values for new 375 watt bulbs used on lines of designated voltage, and these figures can be used directly only during the first hour of the lamp's life. After the first hour, the lens should be opened up V2 a stop; after two hours it should be opened a full stop. The user should find it easy to keep track of the number of hours of lamp use, and thus be able to make these compensations accurately. OTHER VARIABLE FACTORS The guide numbers for two or four lamps are satisfactory for cameras having shutter openings of 160 to 165 degrees and a camera speed of 16 frames per second, or for an exposure time (shutter speed) of about 1/35 second. There are some cameras on the market that have shutter openings as low as 133 degrees. However, these are the exception rather than the rule. When such cameras are used, some compensation in exposure must be made. If you do not know the shutter speed and angle of opening of your movie camera, write to the manufacturer and ask him. Usually about 1/3 of a stop more exposure is needed with cameras having such shutter speeds. Since the guide numbers recommended here are for use with cameras operating at 16 frames per second, if the camera is operated at 24 or 32 frames per second, V2 a stop larger must be used at 24 and 1 full stop larger opening at 32 fps than is required at 16 frames per second. Usually it is not any one factor that causes underexposure, but rather a combination of several factors all accumulating in one direction. For example, a camera with a 133 degree shutter, plus exposures making no compensation for old lamps, plus low line voltage— these three factors alone could add up to an error of nearly two full stops in the diaphragm scale. And with color film this would cause serious underexposure. I feel sure that the majority of exposure failures are caused by such conditions. Therefore, it is important to make the recommended adjustments FIG. 5: Proper positioning of two lamps on light bar should superimpose cones of light. for each variable factor in order to make good exposures. The recommended exposure for those who do not want to use the guide numbers will be found in Table IV. These values are for two new lamps in a lighting bar used on a line of proper voltage. From these figures it is obvious that the use of an f/1.9 lens and the twolamp bar light for color filming is limited to subjects that are at distances not greater than 12 feet from the camera. With the four-lamp bar slightly greater distances can be used. However, for general movie making in the average home, the area covered at these distances is satisfactory. BEAM PLACEMENT IMPORTANT In order to apply the guide numbers and use the lamps efficiently, superimpose the light coming from each lamp (instead of placing the beams side by side as recommended for photofloods) at whatever distance the subject is from the camera. For example, if the pictures are of children playing on the floor 10 feet from the camera and lights, the light beams should be superimposed at a distance of 10 feet. Fig 5 shows the right way of superimposing two PH-375 light beams. This superimposition usually can be done in advance by turning one light on and noting its position on a wall 10 feet away; then turn that light off and adjust the second light so that it illuminates the same spot. There are some light bars on the market that are not adjustable and with these the guide numbers cannot be used. In filming children at play where their actions may occur from 10 feet to 6 feet from the camera, the lamps could be superimposed at a distance of 8 feet. STATEMENT OF THE OWNERSHIP. MANAGEMENT AND CIRCULATION REQUIRED BY THE ACT OF CONGRESS OF AUGUST 24, 1912. AS AMENDED BY THE ACTS OF MARCH 3, 1933. AND JULY 2. 1946 (Title 39. United States Code, Section 233) OF MOVIE MAKERS, published monthly at New York. N. Y., for October 1, 1952. 1. The names and addresses of the publisher, editor, managing editor, and business managers are: Publisher, Amateur Cinema League, Inc., 420 Lexington Avenue, New York 17, N. Y. ; Editor, James W. Moore. 420 Lexington Avenue. New York 17, N. Y. ; Managing Editor, none; Business Managers, none. 2. The owner is: Amateur Cinema League, Inc., 420 Lexington Avenue, New York 17, N. Y. ; Membership corporation with no capital stock. President, Joseph J. Harley, 27 Upper Overlook ltd,. Summit, N. J. ; Vice President, Frank E. Gunnoll, 34 Colonial Court, Staten Island. N. Y. : Treasurer. Walter Bergmann. 30 Alta Dr., Mt. Vernon, N. Y. ; Secretary and Managing Director. James W. Moore, 420 Lexington Ave., New York 17, N. Y. 3. The known bondholders, mortgagees, and other security holders owning or holding 1 per cent or more of total amount of bonds, mortgages, or other securities, are: None. 4. Paragraphs 2 and 3 include, in cases where the stockholder or security holder appears upon the books of the company as trustee or in any other fiduciary relation, the name of the person or corporation for whom such trustee is acting; also the statements in the two paragraphs show the affiant's full knowledge and belief as to the circumstances and conditions under which stockholders and security holders who do not appear upon the books of the company as trustees, hold stock and securities in a capacity other than that of a bona fide owner. JAMES W. MOOBE. Editor. MAKY L. COONEY, Notary Public for the State of New York. Sworn to and subscribed before me this 20th day of September. 1952. (My commission expires March 30. 1953.)