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TECHNICAL DATA DURING TESTS AT THE NORTH STAR DRIVE-IN THEATER, DENVER
1) Wide Screen Readings
Screen brightness readings: 15 4.5 3
3 5.5 3.5
3.5 5 3
4
4.5
Average foot-Lamberts: 3.2
4.7 52
Light distribution: 70%
Lens used: 4 inch f:2
Aspect ratio: 2 to 1
Jet arc burned at 150 amps., 100
volts
Screen image size: Approx. 114 x
57 feet.
Throw: Approximately 552 feet Screen size: 135 x 60 feet.
2) 70MM Readings
Screen brightness readings: 5.5 10 6
5 11 6.5
5.5 10 5.5
13 11.5 12 11.5 Average foot-Lamberts: 5.2 11.3 6.0
Light distribution: 50% Lens used: Kolmorgen 7.5 inch f:2
Jet arc burned at 150 amps., 100
volts
Screen image size: 135 x 60 ft.
Figure 7C
prints. By that I mean the possibility to provide 70MM prints from pictures that are originally photographed in CinemaScope or Panavision on 35MM film.
This process is illustrated with the aid of film clippings from the picture "Carpetbaggers". Figure 7 shows at "A" the squeezed camera original negative. "B" is the 2:1 squeezed print for 35MM release and "C" represents a 70MM release print clipping made from the 35MM original negative. In the Technicolor Laboratories the original negative is unsqueezed and minutely magnified to fit perfectly on 70MM film for a compatible 70MM release print.
With this process the producer has an excellent opportunity to provide first run and/or roadshow houses and of course properly equipped Drive-Ins with 70MM prints of outstanding quality. These prints are not to be classified as "blow-ups" but rather "print-up" pictures. The unsqueezing in the printer is not a blow-up or magnification and does not reduce picture quality.
Another special type of prints from Technicolor are the single film 70MM prints for Cinerama, a clipping of which is shown on Figure 8. This print has inherent a minute squeeze horizontally to compensate for the "tangend" projection situation as it prevails at the sides when showing it into a deeply curved screen. It thus avoids "elongation" of faces, etc., on the sides but does not require anamorphic projection lenses.
Last but not least I would like to disclose a very special 70MM film clipping related to using 70MM print stock to carry the left and right eye images of a 35MM picture produced in 3D.
This print, again made by Technicolor shows that the 70MM print can easily accommodate the two 3D images in perfect registration for a singlefilm single-projector 3D presentation.
In cooperation with the technical director of technicolor, Mr. W. Pohl, I have made successful tests on a big screen proving this method to be desirable for 3D showings either new productions or re-releases in this medium.
It would exceed the scope of this article to go into further details on beam-splitting etc. at this point but I considered it worthwhile to disclose this special application of 70MM film at this time, as a possible prospect for the future.
There are of course many more uses for the 70MM print as image carrier for special types of shows, such as for instance used at the World's Fair with 10 perforation pulldown projectors etc., too numerous to describe in detail. jp
International Projectionist January. 1965
Figure 8
Figure 9