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Author Topic: 3-D Aspect Ratio Michael Coate Phenomenal Film Handler Posts: 1904 From: Los Angeles, California Registered: Feb 2001 posted 02-27-2005 02:15 AM                     Question about the aspect ratio of "over/under" 3-D formats used during the 1980s (StereoVision, ArriVision, Marks-III Depix, etc.). What is the intended projection aspect ratio? Is there an SMPTE spec? Is it 2.35:1? 2.39:1? Other? Anyone have the BKSTS wall charts? I believe one of them included some frame samples from over/under 3-D and may have listed the aperture dimensions. If anyone has these posters, will you please post the aperture dimensions here?  |  IP: Logged Stephen Furley Film God Posts: 3059 From: Coulsdon, Croydon, England Registered: May 2002 posted 02-27-2005 03:25 AM                     I don't have the wallcharts here, but they do show various examples; I can't remember if they give dimensions. The examples shown clearly varied in size, and I don't think there were any standards, it varied from one equipment manufacturer to another, and from film to film.  |  IP: Logged Hugh McCullough Expert Film Handler Posts: 147 From: Old Coulsdon, Surrey, UK Registered: Jan 2003 posted 02-27-2005 04:37 AM                        According to my copy of the BKSTS wall chart the ratio for left over right 3D was 2.35:1  |  IP: Logged Pete Lawrence Expert Film Handler Posts: 192 From: Middleburg, PA Registered: Aug 1999 posted 02-27-2005 07:54 AM                     Here is a scan from Starchaser. Got your calipers? The Paramount mirror box instructions states use their aperture plates or none at all and mask the spillage on the port. How was their plate different?  |  IP: Logged Mark Lensenmayer Phenomenal Film Handler Posts: 1605 From: Upper Arlington, OH Registered: Sep 1999 posted 02-27-2005 08:53 AM                     I have a document from Stereovision International dated 1983 "Principles of Quality 3D Motion Picture Projection" that mentions 2.35 throughout.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 02-27-2005 10:15 AM                     Each film had its own standard as the division septum was different from camera lens system to system as was the optical centerline each film had its own alignment film with corner marks for the masking to be brought into  |  IP: Logged Darryl Spicer Film God Posts: 3250 From: Lexington, KY, USA Registered: Dec 2000 posted 02-27-2005 12:41 PM                    I do know that when Friday the 13th part 3 played at the local drive-in it was showen in cinemascope. So I am assuming that the 2.35 was the intended ratio.  |  IP: Logged Jeffry L. Johnson Jedi Master Film Handler Posts: 809 From: Cleveland, Ohio, USA Registered: Apr 2000 posted 02-27-2005 03:27 PM                        "Principles of Quality 3D Motion Picture Projection" by Chris Condon, ©1983, StereoVision International, Inc.: 3-D FILM INFORMATION SHEET (For choosing the correct lens setting) The STEREOFLEX "HI-LITE"(tm) and STEREOSTAR(tm) adjustable 3-D projection units will project all of the following films. (Contact us for matching alignment test films.) Compact STEREOVISION(tm) split barrel non-adjustable 3-D lenses can also be supplied for _any_ of these films. Please specify. 35mm 3-D RELEASE PRINTS ABOVE/BELOW TYPES ALIGNMENT FILM OPTICAL CENTER SPACING A/B TYPE .359 "The 3-D Movie" *in production June 1983 A/B TYPE .366 "Jaws 3-D" "Amityville 3-D" *in production June 1983 A/B TYPE .370-.375 "Comin' At Ya" A/B TYPE .374 (SAME AS STEREOVISION WIDE SCREEN) "Swordkill" *in production June 1983 "Hot Heir" *in production June 1983 "Metalstorm" *in production June 1983 "Parasite" "Rottweiler" "Revenge of the 13" (Shogun Maidens) "The Winners" (short) "Magnificent Guardsmen" "Emanuelle-4" *in production June 1983 "3-D on Parade" (short) "Dynasty" "Wild Ride" (short) "Hit the Road Running" *in production June 1983 "Rah Rah You're Dead" *in production June 1983 "Pensionatte" "99 Women" *in production June 1983 "Tales of the Third Dimension" *in production June 1983 "Return of the Living Dead" *in production June 1983 "The Legend of Venus" *in production June 1983 "Dark Zone" *in production June 1983 A/B TYPE .380 "Warhol's Frankenstein" "Fantastic Invasion" (The Bubble) "Attack of the Giant Gorilla" (A*P*E) "Artigato" "Rock and Roll Hotel" *in production June 1983 A/B TYPE .383 "Love in 3-D" "Tickled Pink" (What the Butler Saw) "North and South Chivalry" A/B TYPE .387 "Spacehunter" "The Man Who Wasn't There" (Under Pressure) *in production June 1983 "Prison Girls" "Friday the 13th--Part III" "Treasure of the Four Crowns" A/B TYPE .404 "Tiger Man" CONTACT STEREOVISION INTERNATIONAL, INC. FOR ALIGHMENT LOOPS FOR ANY OF THE ABOVE FILMS. $10.00 EACH WITH CONTAINER. 100 ft. LENGTHS $35.00 (ON PLASTIC CORE).  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 02-27-2005 10:51 PM                     Daryl said "I do know that when Friday the 13th part 3 played at the local drive-in it was showen in cinemascope. So I am assuming that the 2.35 was the intended ratio." the 3d prints were about 2.5:1 with the width of the marks stereo septum  |  IP: Logged Frank Angel Film God Posts: 5305 From: Brooklyn NY USA Registered: Dec 1999 posted 02-28-2005 07:09 AM                        I understand that the septum might vary, but why would the centerline?  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 02-28-2005 10:18 AM                        Standard SMPTE 257-1998 "Stereoscopic Prints with Vertically Positioned Subframes — Projectable Image Areas" says: quote: 1 Scope This standard specifies the maximum dimensions of the film image area intended for projection from a 35-mm motion-picture film using vertically positioned subframes for stereoscopic projection, and the placement of this area relative to the perforations and the reference edge of the film.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 02-28-2005 10:02 PM                     The centerline varied because the prismatic or mirror boxes used to position a left and right image one above the other had to do it on a diagonal and depending on the design it was different  |  IP: Logged Jeffry L. Johnson Jedi Master Film Handler Posts: 809 From: Cleveland, Ohio, USA Registered: Apr 2000 posted 03-01-2005 08:16 AM                        BKSTS Wallcharts: FILM GAUGES AND SOUNDTRACKS: 35MM SINGLE FRAME 3-D FORMATS-POLAROID SYSTEM: Stacked images AR2.35:1 Left over right WIDESCREEN & 3-D FILM FORMATS: stacked images widescreen 2.35:1 The various 35mm stacked 3-D systems used different image areas and vertical spacing NATURAMA STEREOVISION MARKS DEPIX OPTIMAX ARRIVISION MOTION PICTURE SYSTEMS FOR SPECIAL VENUES & THEME PARKS: SINGLE FILM/PROJECTOR SYSTEMS For Polarized 3-D Presentations: 35mm print with the pair of stereoscopic images stacked (left over right) within a 4-Perf. frame AR 2.35:1. Also current theatrical release print format.  |  IP: Logged Pete Lawrence Expert Film Handler Posts: 192 From: Middleburg, PA Registered: Aug 1999 posted 03-01-2005 10:23 AM                     Are all the over-under 3D prints in Left over Right format?  |  IP: Logged

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