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1954-55 Theatre Catalog, 12th Edition, Page 275 (239)

1954-55 Theatre Catalog, 12th Edition
1954-55 Theatre Catalog
1954-55 Theatre Catalog, 12th Edition, Page 275
Page 275

1954-55 Theatre Catalog, 12th Edition, Page 275

The system whereby VistaVision employs anamorphic prints uses the present standard aperture .825 by .600 inch and obtains the wide screen effect with an anamorphic lens that has a magnification of 11/2 to 1, As the ratio of the standard aperture is 1.33 to 1 and is anamorphized with a 11/2 to 1 ratio, the total aspect ratio of the final projected picture is 2 to 1. This standard aperture has an opening area of .495 square inch.

The CinemaScope projection system makes use of a still larger aperture, one that is .912 by .715 inch. The extending of the width of this aperture was made possible by relocating the sound tracks, as was done with the stereophonic magnetic sound on the CinemaScope print. The area of this aperture is .652 square inch, the largest of the systems used for general release and consequently it will pass the most illumination. The Cinema Scope aperture has an aspect ratio of 1.27 to 1, and is used in connection with a 2 to 1 magnification anamorphic lens to give the projected picture a resultant ratio of 2.55 to 1.

The recent decision to release optical prints in CinemaScope necessitates the use of an .839 by .715 aperture or ratio of 1.17 to 1 which when projected by the regular 2:1 anamorphic lens results in a picture of aspect ratio 2.35:1. Area of this aperture is .600 square inch.

Comparing the light that can be put through these four apertures, we have the old standard width cut down VistaVision aperture with a 1.85 to 1 ratio to which we will assign a value of 100 units, based on the area of .368 square inches. Accordingly, to the .825 by .600 aperture used with the 11/2 to 1 ratio anamorphic lens, and which has an area .495 square inch, we must assign a value of 135 units since this size aperture

THE SCREEN at the Ames Theatre. Dayton, Ohio, is opened to the VislaViIion ratio of 1.35 to 1.


paSSes 35 per cent more light than the first described aperture. It follows then that the CinemaScope optical track aperture, with an area of .600 square inch rates 163 units, since it projects 63 per cent more light than the first described aperture.

The CinemaScope magnetic print aperture with an area of .652 square inch

projects 41 per cent more light than the first described aperture or 177 units.

THE screen at the Slate Lake Theatre. in Chicago. is opened to the iull CinemuScope aspect ratio.

Since the powerful lamp, referred to previously, without projector shutter running, puts 17,500 lumens through the non-anamorphic VistaVision aperture, it follows that 23,500 lumens can be put through the anamorphic VistaVision aperture, 28,500 through the optical CinemaScope aperture, and 31,000 lumens through the CinemaScope magnetic print aperture,

An Example

Taking the example of a drive-in theatre which has been equipped with the most powerful arc lamps projecting to a 66 by 50 feet white screen with the standard 1.33:1 aspect ratio, it is interesting to compare the size of pictures that can be obtained with each of these new wide screen projection systems to obtain the identical unit brightness on the screen in all cases.

Taking the case of the non-anamorphic VistaVision system, and assuming the picture will be projected to a matte white painted screen, the width of the screen that can be utilized would be 66 feet. In the case of anamorphic type VistaVision, the width of the screen that can be accommodated would be 78 feet wide, optical print CinemaScope screen width could be 92 feet, and in the instance of magnetic track CinemaScope the screen width could be 100 feet. All figures given for systems using anamorphic lenses have recognized the existence of a light loss of about eight per cent introduced by the anamorphic lens attachment.

If the screen, instead of having a matte white surface is an aluminized paint surface with a refiection factor
1954-55 Theatre Catalog, 12th Edition, Page 275