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Author Topic: Bringing 3D on 70mm solution Demetris Thoupis Phenomenal Film Handler Posts: 1240 From: Aradippou, Larnaca, Cyprus Registered: Apr 2001 posted 08-08-2009 01:36 PM                     Call me crazy but why has no one ever thought of doing this. Seeing how stacking of 2 digital projectors helps in illumination and also left/right eye better distribution, how would printing on a 70mm strip half images side by side. Using a spec offset you can have for example 60 frames delay between the left frame and the right frame thus left/right image on the projectors. A double stack system of 70mm projection to show 3D films with the top projector having a gate allowing only the left portion to be shown and the bottom projector with a gate allowing only the right portion to be shown. Would it work or not? Demetris  |  IP: Logged Rick Raskin Phenomenal Film Handler Posts: 1100 From: Manassas Virginia Registered: Jan 2003 posted 08-08-2009 01:49 PM                     Theoretically it would work if all installations followed strict spacing rules between the top and bottom projectors. However, wouldn't it be better to print the images synchronized side by side and let the optics do the alignment? I think you could pump enough light through one film projector to fulfill the illumination requirements.  |  IP: Logged Demetris Thoupis Phenomenal Film Handler Posts: 1240 From: Aradippou, Larnaca, Cyprus Registered: Apr 2001 posted 08-08-2009 02:02 PM                     As I set, a spec offset between the top and bottom image. Sound is a different aspect. Although now that I think about it more, it would be wiser having them side by side and using a double lens feature since splicing would be identical on the two images. Well just a thought what do you think? Demetris  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 08-08-2009 03:23 PM                     House of Wax was widely shown in side by side 70mm 3-D in the 70s. It was spectaculuar for sure but the 1:33 aspect ratio of the movie also perfectly lends itself to doing this and keeping the spherical lenses on the projector. Down side is you still need a silver screen. Actually there are 10 perf 70mm projectors so you could do full frame 70mm over and under easily. Its just not practical today in today's typical multiplex situation. No one could properly run the 70mm equipment for the most part... at least what equipment is left today... not that much really. 10 perf really flys fast... almost as fast as Imax! Mark  |  IP: Logged Richard Hamilton Phenomenal Film Handler Posts: 1341 From: Evansville, Indiana Registered: Jan 2000 posted 08-08-2009 04:19 PM                     I installed a couple of Mega 8/70's at a park in China. One is a 3D ride, the other is a 4D. I worked on a 5/70 projector out in L.A. that ran 48 FPS. We were looking at doing 3d on that single projector, not sure what ever happened with that project...  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 08-08-2009 04:34 PM                        Once again (cost wise) Digital TV makes 70mm make sense. Louis  |  IP: Logged Christian Appelt Jedi Master Film Handler Posts: 505 From: Frankfurt, Germany Registered: Dec 2001 posted 08-09-2009 10:09 AM                     Demetris, there was a single-strip 65/70mm 3D process in the 1960s known as HiFi Stereo 70. Dual anamorphic images on 5-perf 70mm with a single beam splitter lens (IIRC, it was called "Stereo-Kinotar" and distributed by Kinoton). You can see a 3D film clip at the beginning of chapter 6 of this text: M.C.S.-70 (in70mm.com) Not quite as bright as double 70mm 3D, I have to admit.  |  IP: Logged Joe Redifer You need a beating today Posts: 12859 From: Denver, Colorado Registered: May 99 posted 08-09-2009 10:20 AM                        What the eff is "4D"? You can't make up your own dimensions.  |  IP: Logged Adam Martin I'm not even gonna point out the irony. Posts: 3686 From: Dallas, TX Registered: Nov 2000 posted 08-09-2009 12:28 PM                     Time travel.  |  IP: Logged Demetris Thoupis Phenomenal Film Handler Posts: 1240 From: Aradippou, Larnaca, Cyprus Registered: Apr 2001 posted 08-09-2009 01:19 PM                     quote: Mark Gulbrandsen Down side is you still need a silver screen. Why is that Mark? quote: Christian Appelt Demetris, there was a single-strip 65/70mm 3D process in the 1960s known as HiFi Stereo 70. I did not know that! Thanks.  |  IP: Logged Darryl Spicer Film God Posts: 3250 From: Lexington, KY, USA Registered: Dec 2000 posted 08-09-2009 02:31 PM                    quote: quote: Mark Gulbrandsen Down side is you still need a silver screen. Why is that Mark? To maintain polarization of the light. As for the downside it is because of the hot spotting and the loss of light associated with where one sits in the theatre. Light uniformity sucks on a silver screen plain and simple. [ 08-09-2009, 03:55 PM: Message edited by: Adam Martin ]  |  IP: Logged Richard Hamilton Phenomenal Film Handler Posts: 1341 From: Evansville, Indiana Registered: Jan 2000 posted 08-09-2009 06:16 PM                     quote: Darryl Spicer was the last to post What the eff is "4D"? You can't make up your own dimensions. If your good like me you can Actually it adds other effects to the movie. In this one it drops bubbles from the ceiling in one scene, a mist of water in your face when an elephant sneezes, and strobe lights and air sprayed at you in different scenes. 4D pic Rick  |  IP: Logged Randy Stankey Film God Posts: 6539 From: Erie, Pennsylvania Registered: Jun 99 posted 08-09-2009 10:02 PM                     Funny story: Cinemark used to run a 3-screen theater inside the local mall. It's one of places I trained before Tinesltown-17 opened. One of the managers who used to run the place told me that the block walls were filled with granular Styrofoam insulation. When the wind blew hard enough from the right direction, some of the Styrofoam beads used to blow out from the cracks in the walls and into the theater. It was during the run of "Miracle on 34th St." (1995 remake) when a customer came out to report that white Styrofoam was blowing into the theater. The manager, without missing a beat, said, "Yes, I know. It's a new special effect to make it feel more like Christmas in the theater." Story goes... The guy bought it! He went back in, sat down and thought he was seeing something extra special!  |  IP: Logged Jack Ondracek Film God Posts: 2348 From: Port Orchard, WA, USA Registered: Oct 2002 posted 08-09-2009 10:19 PM                        A bit off-topic, but... Is there any reason, besides Real-D's infinited displeasure, why a 3D process couldn't be encoded before the picture is placed onto the hard drive, possibly allowing you to avoid some of the light losses currently experienced?  |  IP: Logged Joe Redifer You need a beating today Posts: 12859 From: Denver, Colorado Registered: May 99 posted 08-10-2009 02:54 AM                        I didn't know that bubbles, etc were actual dimensions unto themselves!  |  IP: Logged

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