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Doc Faige & Assoc., 630 Ninth Av., NYC V
THE WORLD FAMOUS
“SILVERLITE”
ALL PURPOSE SILVER SCREEN and the NEW ULTRA WHITE
HI-LITE SCREEN
100% VINYL PLASTIC. MOLD & FUNGUS PROOF
Theatre Screens with a World-Wide Reputation since 1927
VOCALITE SCREEN CORP.
ROOSEVELT, NEW YORK
size of .912" X. 715"; however, the picture on the film is compressed to an anamorphic ratio of 1.5-to-l, and when projected through a 1.5-to-l anamorphic expander a picture 16 feet by 31 feet will be obtained. This will have an enlargement ratio of only 110,000 times. Item 7 shows a cropped picture of the same size which, however, has twice such enlargement (216,000 times).
The case shown in Item 5 is quite similar, but the picture area on the film is reduced to .839" x. 7 15" to suit singletrack optical sound. Even for the largest picture possible under the conditions of this discussion. Item 10 shows that a 21foot by 40-foot picture projected with a 1.5-to-l anamorphic system would have an enlargement factor of 185,000 times, which is far less than the 340,000 times produced by the cropped picture of Item 9.
If all pictures were photographed anamorphically in a proper ratio and released with the four-track magnetic CinemaScope print specifications (aperture size .912"x .715"), both CinemaScope and 2-to-l ratio
THEATRE MANAGEMENT sometimes considers the purchase of new high-speed lenses without taking into consideration the slow speed of their lamphouse optics.
If the projection is faster than the lamphouse optics, the light at the center of the screen will not be increased, but the light at the side and corners will be greater than before.
pictures could be projected to a width of 40 feet with acceptable magnification. This would be especially true with print-down from larger negative frame. With the latter technique plus recent improvements in chemical reagents, the above proposals should insure extremely good picture quality even in the upper picture sizes.
If it were possible to have such procedure universally accepted, projection would be simplified considerably.
The height of the pictures would be the same and the center lines of the pictures would coincide.
Full size apertures could be used, and the projectors would not have to be moved between pictures.
The same back-up lenses could be used in all cases.
This system would simplify motion picture projection among the majority of theatres everjTvhere without placing any burden on technical progress. To the contrary, it would enable the industry to realize more consistently the advances it has already achieved.
If the projection lens is slower than the speed of the lamphouse optics, a considerable amount of light efficiency is lost for both the centers and the sides of the screen. This effect will be noticed if faster lamps are installed without a change in the projection lenses.
It has been customary to classify projection lenses by their F / number and this procedure is now being followed for the
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FIGURE I: Matching of lens and reflector for center of film gate maximum speed.
FIGURE 2: Matching of lens and reflector for corner of film gate — reduced speed.
SPEED IN PROJECTION OPTICS
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Motion Picture Herald, March 24, 1956