Motion Picture Herald (Apr-Jun 1956)

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Hi LUX Comparison tests in famous theaters throughout the world have proven Hilux Anamorphic Projection Lenses vastly superior. Precision designed and built, they have optimum optical correction for color, definition and distortion. You owe it to your audiences to use Hilux Anamorphics for ALL prints. An amazingly precise variable anamorphic that gives non-vignetting performance with both 4" (101.6mm? and 2J5/)2" (70.6mm) diameter prime lenses. Complete control up to 2X without shifting lens or projector. A high quality 2X fixed anamorphic for all projection lenses up to 225/s2" (70.6mm) with a 64mm free rear aperture for maximum non-vignetting light transmission. A 1.5X to 2. OX variable anamorphic for all standard 2i5/n" (70.6mm) projection lenses. 64mm free rear aperture assures maximum light with no vignetting. Hilux 264 and 152 are available with either fixed or variable corrector lenses. For catalog sheets and focal length computer, write Dept. BT-56. ROJECTION OPTICS v ) PROJECTION OPTICS CO., INC. Rochester, N. Y. • London, England spherical zone. The specular surface of an aluminized screen, however, concentrates the reflected light energy into a restricted zone looking somewhat like an elongated balloon. Even though the total light energy from a metallic screen is actually less than from a white screen, the apparent brightness of the metallic screen, as observed from certain directions, may be considerably greater because the characteristics of a metallic screen tend to concentrate this energy into a smaller or more confined space. MEASURING REFLECTANCE Luckily there is a comparatively simple way to measure or compare the reflectivity characteristics of any of the surfaces used for projection screens. The methods have been described in several back issues of the SMPTE Journals. Figure 1 shows a sketch from one of these articles and may serve to illustrate the procedure. A small light projector C, using a regulated power source, is used to project a spot of light a few inches in diameter upon a screen sample set up on a small frame A. A photocell B and meter D are used to read the value of the light reflected from this illuminated spot on the screen. By arranging the device so that the photocell can be swung in an arc from 0° to 90°, the brightness of the spot on the screen may be observed and measured from different positions ranging from practically perpendicular to the screen, to any angle between. With this kind of a test bench, many screen samples can be tested and compared. As we said before, the surface of a magnesium carbonate block has been used as a standard. If such a surface is located in position A in the test, then the reading obtained can be used as a reference point for making comparisons with all other samples. An easy procedure is to control the light intensity of lamp C until a reading of 100 Super-Hilux * THE PROJECTION LENS with GREATEST OVER-ALL INCREASE IN LIGHT TRANSMISSION . //get F/.O COUECWG SPEED year in service . . . proven in hundreds of theaters! to present an entirely new concept of theater projection! to be designed with emphasis on acutance! to be chosen by leading DRIVEINS and THEATERS. Four reasons why a Super-Hilux should be 1st on your list of “Musts.” Write for comparison tests and focal length computer to Dept. BT-56 20 MOTION PICTURE HERALD, MAY 12, 1956