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This topic comprises 3 pages: 1 2 3
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Topic: Are there many theatres that can still show dual projection 3D?
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 09-09-2002 05:57 PM
I'm actually working on a project that should be able to have a 4-projector 2-strip 3-D changeover...detail will be made available in the future.Anyway as to what it takes...it all depends on what you have and what you want. You can use the selsyn method but be sure to also get the shutters in time with each other before "locking" the machines. The power switches for both motors should also linked so the selsyns are only there to maintin sync, not actually drive the projector. For more modern methods, you can have 3-phase motors with motor conrollers. You could have one controller operate both motors or some controllers can "talk" to link them up. You will need a "silver" screen for polarized 3-D and polarizing filters for each machine (with the proper glasses for the audience). Steve ------------------
"Old projectionists never die, they just changeover!"
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Stephen Furley
Film God
Posts: 3059
From: Coulsdon, Croydon, England
Registered: May 2002
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posted 09-09-2002 06:06 PM
I've only seen single strip 3D a couple of times, in the under/over format. I felt the screen brightness left something to be desired. I remember on one occasion the first reel had been laced up two perfs out of rack, so the left/right images were reversed. Unlike with the anaglyph system, you cannot correct this by turning the glasses round, each eye will still see the same image, you can however do it by turning the glasses upside down, which those of us who realised what was wrong did, others followed our actions, and soon most of the audience were watching through inverted glasses. At this point, word must have got back to the projectionist, as the film was pulled up by the necessary two perfs, almost the entire audience then similtaniously removed their glasses, and returned them to the normal position!Of course, this also had the effect of one eye seeing the previous image, relative to the other. I have never seen the 1.37 side by side anamorphic system, I would imagine that it would involve even more light loss than the under/over system. I only know of two films released in this format, the re-release of 'House of Wax', which I am told was not of as good quality compared to the two strip original, and 'The Stewardesses', which I believe held some sort of record at the time of its release for something like grearest ratio of earnings to production costs for a 3D film, or something similar. Does anyone know of any other films in this format? I also never saw the two formats which used who images side by side, each rotated through 90 degrees, in either the same, or opposite directions. I think these were used mainly by warious 16mm systems. Bernard, what screen size did you see single strip on, and do you happen to know what lamp Wattage, or current, was used?
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Bernard Tonks
Jedi Master Film Handler
Posts: 619
From: Cranleigh, Surrey, England
Registered: Apr 2001
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posted 09-09-2002 08:04 PM
Claude wrote, quote:
Bernard,
How is it possible to interlock four projectors to show dual strip 3-D so that an intermission is not necessary? I alway thought the distance between the two projector must represent the same distance as one eye is to the other.
I think you will find that only large cinemas were equipped with four projectors, and they would have had long throws, also the academy ratio screens would not have been much larger than 24’. Therefore lining up the four projectors was achieved for 3D presentation.
Just out of interest an Independent cinema owner in Herfordshire, kept his four projectors running after the 3D era, two were for wide, and the other two for scope! Stephen wrote, quote:
Bernard, what screen size did you see single strip on, and do you happen to know what lamp Wattage, or current, was used?
The Classic Cinema, Piccadilly was a very tiny ex Cartoon & News Theatre, I would think under 200 seats. At a rough guess I don’t suppose the screen would have been much wider than 20’. You are stretching my memory with the Philips FP20s, they could have been pulse light or xenon.
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 09-09-2002 08:49 PM
The last wave of 3-D films (single strip) that I ran (starting in 1981) was:Coming At Ya
Friday the 13th part 3
Jaws 3-D
Spacehunter
Parasite
Some film with Steve Guttenberg..."Invisible Man" or something to that effect.
The Reissue of House of Wax in side-by-side 3D I'm sure others will come to me after I stop writing. Many of the above debut different lenses. Coming At Ya used the "Marks" polarising system, Space Hunter had the nifftiest lens that allowed separate left and right eye focus and removable polarizers. Friday the 13th had the Paramount box that allowed for separate left and right eye keystone compensation and a polarizer card. The Stereovision company also was very supportive during this era...eventually coming out with a universal lens attachment that would work on most any projector. Steve ------------------
"Old projectionists never die, they just changeover!"
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Frank Angel
Film God
Posts: 5305
From: Brooklyn NY USA
Registered: Dec 1999
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posted 09-10-2002 06:48 AM
Almost any change-over house can run dual strip 3D with a few extra pieces of equipment. The interlock selsyns and the silver screen. As simple as that might sound, alas, I have yet to run a 3D festival in my theatre. I've got the selsyns, but not the silver screen. Because the 2500 seat house has wide seating, I can't install a silver and then leave it there to use for regular sceenings. Although, with the number of people we get for most shows, I suppose we could mark off the side seats were image would fall off and contain the audience to the good image seating, but there are times when we do get large crowds, especially for sneaks. Then what do I do? Plus, we just don't have the dollars to spend on a silver screen, even if I wanted to go that route, especially since the one we have is in good condition. But I sure would love being able to run dual strip HOUSE OF WAX, my favorite of all time. Frank Our selsyns mechanically couple to the standard induction motor by a belt. Does any manufacturer make a dual motor arrangement with a standard motor and a selsyn section built into the same housing?
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Stephen Furley
Film God
Posts: 3059
From: Coulsdon, Croydon, England
Registered: May 2002
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posted 09-10-2002 07:24 AM
Bernard wrote: quote:
I agree, I saw THE BUBBLE in perfect 3D projected from a Philips FP20 with an excellent xenon light at the small Classic Cinema, Piccadilly Circus. It can be done.
And then: quote:
The Classic Cinema, Piccadilly was a very tiny ex Cartoon & News Theatre, I would think under 200 seats. At a rough guess I don’t suppose the screen would have been much wider than 20’. You are stretching my memory with the Philips FP20s, they could have been pulse light or xenon.
On a screen that size single strip would probably work well, but I don't find it very satisfactory at larger sizes. Two strip gives a much better light output. I think the best solution may be single strip 70mm, either two roughly Academy sized frames side by side for 1.37, or two normal 70mm frames, under and over, with a ten perf pull down for widescreen. I believe such systems have been built for special venue use, but I have never seen one.
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