International photographer (Jan-Dec 1935)

April, 1935 T h INTERNATIONAL PHOTOGRAPHER Three CINEMATOGRAPHERS BOOK of TABLES For 35mm and 16mm The practice of cinematography falls naturally into two distinct divisions, one the Art and the other the Science of Cinematography. As a consequence the cinematographer is constantly playing a dual role. One minute he may be a sensitive artist, his mind receptive to the many impressions that influence his work as an interpreter and creator. At any moment, however, he may have to step out of this part and bear down with lowered brow to the business of being a technician. Much of this activity along technical lines consists of little more than routine computation which, after all, is sheer waste of time if the answer (which is all that matters) can be obtained at a moment's notice by referring to a table. At the same time information that is ordinarilj ignored, simply because it is not available in work-a-day form, may thus be utilized when the occasion arises. . . . ILLUMINATION Types of Incandescent Lamps used in Motion Picture Photography. Relative Distribution of Radiant Energy emitted by various types of Carbons. Variation of Light, Life and Wattage of gas tilled Mazda Lamps, when operated at voltages above or below their rated voltages. ANGLE OF VIEW AND SIZE OF FIELD EMBRACED BY LENSES OF VARIOUS FOCAL LENGTHS 16 mm. Film. 35 mm. Film. MAKE-UP Panchromatic Make-up Numbers. FILTER TRANSMISSION GRAPHS FILTER FACTORS Filter Factors for normal daylight exposures on standard brands of Panchromatic Motion Picture Film. F/Values compensated for various filter factors. DYNAMIC SYMMETRY The Mean and Extreme Ratio applied to motion picture composition. APERTURE UNITS Relative transmission of light through a lens at various I" /values, expressed in terms of Aperture Units. TIME UNITS Degrees of shutter opening required to obtain various units of exposure expressed in Time Aperture Units. SHUTTER VALUES F/values required in order to obtain the same exposure at various degrees of shutter opening. Equivalent F/values obtained when the shutter is closed down instead of the lens diaphragm. TIME CONVERTED TO FEET OF FILM 16 mm. Film. 35 mm. Film. EQUIVALENT MAGNIFICATION Distances to objects required for various lens in order to produce images of equal size on the film. OVER-ALL MAGNIFICATION Over-all magnification of the projected image for various combinations of camera and screen magnification. DEPTH OF FIELD 20 mm. Lens. 25 mm. Lens. 35 mm. Lens. 40 mm. Lens. At Your Dealers By Fred Westerberg 50 mm. Lens. 75 mm. Lens. 100 mm. Lens. SUPPLEMENTARY LENSES 16 mm. Film. Data on the use of various supplementary lenses in photographing at close range with camera of the fixed focus type. SENSITOMETRY "The characteristic curve. Converting density readings to Gamma. Over-all Gamma obtained by various combinations of Negative and Positive Gammas. Conversion Table. Density to Transmission to Capacit\ . Color Sensitivity of the Eye. Color Chart. THE COLOR OCTAVE Wave Length and relation vibration frequency of the various colors that appear in the visible spectrum. PROJECTION Size of picture obtained in projection with different lenses at various distances from the screen. 16 mm. film. Width of picture obtained in projection with different lenses at various distances from the screen. 35 mm. film. Width of picture obtained in projection with different lenses at various distances from the screen. Projection background process. 35 mm. film. Effect of projection angle on screen proportion and on the rectangular shape of the picture. Effect of various screen magnifications on the brightness of the projected image. 16 mm. Film. 35 mm. Film. Incandescent lamps for use with 8, 16 and 35 mm. portable projectors. 8 mm. FILM DATA Angle of view and size of field embraced b\ Camera Lenses. Size of picture obtained in projection at various distances from the screen. MISCELLANEOUS DATA Running time at various camera speeds for use in checking the speed of camera motors. 35 mm. film. Fast working fixing bath. Copper Wire Table. CAMERA IDENTIFICATION MARKS. 16 mm. FILM FILM AND APERTURE SPECIFICATIONS 16 mm. Film. 35 mm. Film. DEVELOPER FORMULAS WEIGHTS AND MEASURES Conversion Tables. Grams per Liter to Grains per Quart and to Ounces per Quart, etc. Conversion Tables, mm. to Inches — Inches to mm. Grams to Grains — Grains to Grams. Metric and U. S. Equivalents. Advertising Section.