American cinematographer (Jan-Dec 1949)

COLOR COMPENSATING FILTERS SIMPLIFIED (Continued from Page 284) U. S. Pat. No. 2260368 Goerz American APOGOR F :2.3 the movie lens with microscopic definition successful cameramen have been waiting for — • A new six element high quality lens for the 16 and 35mm. film camera. Corrected for all aberra¬ tion at full opening, giving highest definition in black-&-white and color. Made by skilled techni¬ cians with many years of optical training. • Fitted to precision focusing mount which moves the lens smoothly without rotating elements or shifting image. • This lens comes in C mount for 16mm. cameras. Fitting to other cameras upon special order. • Sizes available now: 35 and 50mm. uncoated and 75mm. coated. Write for prices, giving your dealer's name. The c.p. GQERZ AMERICAN OPTICAL COMPANY Office and Factory 317 EAST 34 ST., NEW YORK 16, N. Y. AC-8 r/ii SOUND ur^^'io your' SILENT FILMS ( Music • Narration * Special Effects ) LET us convert your 16 mm picture to a sound film of the highest quality. Skilled technical staff, and finest sound recording equipment and studio fa¬ cilities to serve industrial, amateur and educational film producers. Write TELEFILM, Inc., Dept. A-l I 6039 Hollywood Blvd., Hollywood 28, Calif, for prices and literature. OUR SERVICE IS USED BY: • U.S. Navy • Lockheed Aircraft Co. • Douglas Aircraft Co. • Food Mach’y Corp. • U.S. Dept, of Int. • Santa Fe Ry. • Standard Oil Co. TELEFILM HOLLYWOOD GEO. W. COLBURN LABORATORY, Inc. 164 N. Wocker Dr., Dept. A , Chicago 6, III. is the same as the old CC filters. These CC filters for use in obtaining cooler and warmer results — CC3, CC4, CC5, CC6, CC13, CC14, and CC15— will still he obtainable as will be the CC95. The new filters will be available in the standard, lacquered gelatin-film squares, but they can also be obtained in mounted discs for use with Kodak ombination Lens Attachments. The chart on page 284 gives the ap¬ proximate exposure increase that should be allowed with each of the new filters. OTHER TYPES OF KODAK COLOR COMPENSATING FILTERS AVAILABLE Bluish Filters Exposure (for cooler Increase rendering) in Stops* CC3 1/3 CC4 1/3 CC5 2/3 CC6 1 Yellowish Filters Exposure (For warmer Increase rendering) in Stops* CC13 1/3 CC14 1/3 CC15 1/3 *These values are approximate. For critical work, they should he checked by pratical test, especially if more than one filter is used. CC95 filter is available in addition to above. It is recommended for use with Kodak Ektachrome Film, Type B, and clear G.E. flash lamps. THE NEW NORD CAMERA (Continued from Page 282) absolutely positive registration. The film feeding finger enters the perforation straight; it then moves with the film straight down, stopping at the bottom of the stroke and withdrawing straight out. The film feeding finger is ground and lapped to a perfect fit in the perforation. The entire movement is driven by a single cam. Both the cam and film feed¬ ing finger are made of hardened tool steel and the parts are extremely light (film feeding finger weighs approxi¬ mately 20 grains). Even this weight is carefully balanced so that the entire film feeding mechanism is exceptionally free from vibration. One of the most important features in the Nord Camera is the self-engaging action of the feeding finger. Heretofore it has been necessary for considerable care to be taken in lining up the perfora¬ tion with the point of the claw. When¬ ever this was not done in threading, the claw would punch holes in the film, causing the camera to jam. This might occur due to faulty threading or between takes if the film should shift slightly in the gate. In the Nord Camera this is impossible. In threading the camera if film happens to be placed in gate so that the claw does not line up with the perforations, a safety spring in the mechanism causes it to continue its normal vertical move¬ ment without driving the claw through the film. As the claw is moved down it drops into the first perforation and con¬ tinues the normal feeding cycle. Since the film is brought to a dead stop by the film feeding finger, only a light gate pres¬ sure is required and this considerably re¬ duces the danger of scratching. The aperture plate of the Nord Cam¬ era can be easily and quickly removed from the camera to permit thorough cleaning of the surface on which the film rides and also the photographic aperture. Thus the cameraman can be positive that there will be no “whiskers” around his picture. This is a feature that has long been needed. A valuable feature in the Nord Cam¬ era is the wide shutter opening provided. The light is obscured for only 1/3 of the cycle so that the exposure is 1/36 of a second when shooting pictures at sound speed. Working under adverse light conditions this longer exposure often means the difference between suc¬ cess and failure. Shots in factories can be made with 1/3 less artificial light. Two lighting units do the work of three. The shutter is of the fixed type since it is modern practice to insert fades at the laboratory. The shutter racks over with the mechanism so that in viewing position the shutter can never interfere, and consequently does not have to stop in open position. This is especially im¬ portant in animation work since it makes it possible to throw the camera over into viewing position whenever desired with¬ out losing a frame. Both reel spindles in the Nord Camera are equipped with clusters to permit automatic take-up in either direction 296 • American Cinematographer August, 1949