American cinematographer (Sept 1935)

390 American Cinematographer • September 1935 De Brie at Sacrifice New Type SUPER PARVO DEBRIE Ultra Silent Camera Has built-in motor, automatic dis- solve, pilot pins and anti-buckling de- vice. Four 1000-ft. magazines—40mm, 50mm and 75mm lenses—Debrie fric- tion tripod and new type Debrie finder. Leather-covered carrying trunk and tri- pod cover. It’s the latest type equip- ment . . . like new! Motion Picture Camera Supply, Inc. 723 Seventh Avenue New York City Cable: “Cinecamera” INBUILT DIFFUSION FEATURES NEW LAMP Inherent diffusion and a built-in dim- ming rheostat feature a new general lighting unit developed by A. C. Jenk- ing, of Hollywood. The lamp is of the reflector type, employing standard PS 1,000 or 2,000 watt globes to which a special reflecting area has been applied. This reflecting surface consists of a mir- rorlike aluminum deposit which is stated by the inventor to be of the highest re- flective value, and to withstand wear, heat, and virtually all corrosive action; __ Holl'V^ood f^OTlON pICTURE/COUIPMEliT (O. [[D. 64 5 NORTH MARTEL AVE- CABLE ADDRESS ARTREEVES HOLL.VWOOD, CALIFORNIA. U SA Model B Professional $300.00 For Bell & Howell and Mitchell Cameras and their respective T'ipod. With the ORIGINAL instant release telescopic hnndle. FRED HOEFNER GLadstone 0243 5319 Santa Monica Boulevard LOS ANGELES, CALIF. TRUEBALL TRIPOD HEADS OF SPECIAL ALLOY LIGHTER WEIGHT The Same Efficient Head For follow shots, known for their smoothness of opera- tion and equal tension on all movements. Unaffected by temper- ature. Model A for Ama- teur motion picture cameras. Attaches any standard STILL Tripod, $12.00. Trueball tripod heads are unexcelled for simplicity, ac- curacy and speed of operation. The Hoefner four- inch Iris and Sun- shade combination is also a superior product. it is coated on the front side of the globe, and reflects the forward rays of the filament back upon the lamp's main reflector. This reflector is non-specular, and is also an electrolytic deposit of aluminum. According to the inventor, its surface is microscopically faceted by means of this plating action, and breaks up the light-rays into a completely diffused beam, eliminating the need for con- ventional diffusers. Due to the extreme diffusion thus produced, the lamp will not produce a hard shadow at any time. The globe and the reflectors are fixed, and the beam does not focus as in con- ventional units. The rheostat is mounted at the rear of the lamp house, behind the reflector. It is controlled by a knob located cen- trally on the back of the lamp. The new lights are being manufactured un- der the name "Vitachrome." PHOTOGRAPHIC SLIDE-RULE John L. Russell, Jr., A.S.C., has de- veloped a slide rule which greatly simpli- fies the computation of photographic variables such as filter-factors, shutter- apertures, still - camera exposures and depth of focus. On one face of the rule is a depth of focus calculator, by which the focal depth of any lens from 25mm to 200mm may be instantly determined for any focal setting and aperture. Lenses of longer focus can also be ac- commodated by a simple additional pro- cess. The opposite face of the rule provides means for determining the correct ex- posure for any filter on Eastman Type 2 or SuperSensitive, DuPont Regular, Special or Superior, and Agfa Super- Pan films. By the same device, the cor- rect lens-aperture for any change in shutter-opening or camera-speed may be quickly determined, motion picture camera exposures may be translated into still-camera exposures, and all exposure- factors in still photography may be de- termined exactly as accurately as are cine factors.