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TOPIC: 3D Films

3D Films 13 Jun 2005 08:48 #10942

I heard you need a silver coated screen for showing 3D films. What do you need to change from a pair of older Simplex projectors. Does it take a long time to configure ? Thanks.
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Re: 3D Films 13 Jun 2005 09:02 #10943

  • John Pytlak
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Of course 3D projection requires a separate image for the left eye and the right eye. This can be done using color (the systems that use glasses with a cyan lens and a red lens) called anaglyph ("Shark Boy and Lava Girl" are currently using this system). Any regular screen can be used.

Better systems use polarization to separate the images. The projector(s) use polaroid filters to polarize the image, which must be shown on a screen that maintains the polarization (high gain "silver" screen). The audience wears glasses that have polaroid filters so each eye sees the appropriate image.

In older systems and modern IMAX 3D systems, TWO projectors running in perfect sync were used, using some sort of interlock system (e.g., selsyn motors). More recent 35mm systems put the left and right images on the same print, usually in an "over-under" configuration, and a special lens projects the two images on the screen with the proper polarization. The two projector system can offer better quality, since a larger area of film is available, giving better light. But both prints MUST be exactly the same length, with no missing footage to put the images out of sync. The "over-under" system with one print stays in sync even with loss of footage, as long as the left and right images are always shown as a pair.

John P. Pytlak, Senior Technical Specialist
Customer Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: +1 585-477-5325 Cell: +1 585-781-4036 Fax: +1 585-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion
John P. Pytlak, Senior Technical Specialist
Customer Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: +1 585-477-5325 Fax: +1 585-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion
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Re: 3D Films 16 Jun 2005 16:25 #10944

  • tratcliff
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I run 3-D most every Halloween, usually House of Wax.
I have a silver screen.
The print is actually a side-by-side, similar to what John explained for over-and-under.
I have a lense adapter that I bought from Stereo-Vision that fits on the end of my scope lense.
It works pretty well - not even close to as good at two-projector. But it does OK.

Tony R.
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Re: 3D Films 17 Jun 2005 00:42 #10945

  • rodeojack
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The two-projector "polaroid" method, that's used in the Florida & California theme park attractions is outstanding... much better than anything I've seen with the anaglyph method.

Add the water sprays, "pokers" and miscellaneous bugs & stuff dropping from the ceilings & the whole concept works pretty well.
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Re: 3D Films 19 Jun 2005 22:59 #10946

  • revrobor
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I have not read everything posted re: 3-D but I'm a bit surprized that it's being touted as if it's something new. We had 3-D (the two projector system) back in the '50s and it didn't last more than a few years. Mostly, I think, because the stories were weak and most of the action was throwing things at the camera to make the audience duck (much like today's weak storied films that try to make it on CG special effects).

Who knows, perhaps they'll ressurect "SmelloVision"

Bob Allen
The Old Showman
Bob Allen
The Old Showman
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Re: 3D Films 20 Jun 2005 04:43 #10947

  • rodeojack
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Maybe, Bob... but I'm holding out for those electrified chairs! THAT would be fun!
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Re: 3D Films 20 Jun 2005 08:11 #10948

Ya know what would be fun, a good 3D Horror Film, possibly for IMAX.
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Re: 3D Films 20 Jun 2005 10:38 #10949

  • outaframe
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Horror film eh, how 'bout "House of Wax" (WB 1953, Vincent Price) the first major studio release in 3-D, and probably the only DECENT movie ever made using the process... Seems like they drag this old saw out every few years and try it again, and it STILL doesn't cut it... Back in the early 80s the much ballyhooed "Jaws 3-D" was a mess, and the handful of other 3-D productions made then were worse... I thought we had finally seen the end of it, but now they're trying CGI 3-D... A gimmick is a gimmick, and it still won't make a silk purse out of a sow's ear... Also, people hate wearing those stupid glasses... The best I have seen was a 3-D Imax short specialty at the Luxor in 'Vegas several years ago, but that was in a venue specifically built for 3-D, and the subject matter and process was restrained to not overdo the gimmicks: it worked quite well (a polarized process) but still required the glasses... I can't believe it will EVER be more than an occasional novelty... And yes JACK, they had a "space ship" platform with the seats attached which was hydraulically manipulated in conjuntion with the screen action in another showing at the Luxor... Not electrified, but it bucked like a bronco at times, and shook you like a leaf in the wind... Very engrossing!...
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Re: 3D Films 20 Jun 2005 12:25 #10950

  • John Pytlak
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The IMAX 3D production of "The Polar Express" looked very good, and used the format very effectively.


John P. Pytlak, Senior Technical Specialist
Customer Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: +1 585-477-5325 Cell: +1 585-781-4036 Fax: +1 585-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion
John P. Pytlak, Senior Technical Specialist
Customer Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: +1 585-477-5325 Fax: +1 585-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion
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Re: 3D Films 27 Sep 2005 13:06 #10951

  • BurneyFalls
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Now that the newest form of 3-D technology is being trumpeted as sevstar reported in his topic, Going Deep for Digital (www.nytimes.com/2005/09/26/business/media/26digital.html), I am still wondering how many of us little gals and guys will compete. But that is another topic.

My question here is about 3-D. If specific frames are only meant to be seen by say the left eye, what happens if someone only has a right eye? I am being serious here, so don't laugh. I am personally thinking about getting contact lenses, using one lens for reading and the other for distance. How would that affect the 3-D experience. OK, you can all laugh now, but maybe someone will be kind enough to explain this to me.
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Re: 3D Films 27 Sep 2005 16:02 #10952

  • John Pytlak
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Yes, two eyes are needed to "see" 3D. Even if the eyes don't have the same visual acuity, you will likely still perceive 3D. But if one eye really sees an unsharp image, you may be more likely to suffer eyestrain or headache.

John P. Pytlak, Senior Technical Specialist
Customer Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: +1 585-477-5325 Cell: +1 585-781-4036 Fax: +1 585-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion
John P. Pytlak, Senior Technical Specialist
Customer Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: +1 585-477-5325 Fax: +1 585-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion
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Re: 3D Films 27 Sep 2005 21:50 #10953

  • BurneyFalls
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Thanks, John!
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Re: 3D Films 28 Sep 2005 09:12 #10954

  • sals
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Hey Burney,

I'm doing the same thing with the contacts but am getting a separate distance contact for the "reading" eye. Then for certain occasions, like kayaking and moviegoing, I can change it out....

S
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