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Topic: Striped 16mm
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John A. Pommon
Film Handler
Posts: 69
From: San Francisco, California 94131
Registered: Nov 2004
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posted February 03, 2007 10:10 PM
quote:
A mag stripe on one side naturally makes the film thicker on that side, so one side of the frame is further away from the lens that the other.
That's right Hugh, a balance stripe equal to the thickness but narrower than the sound-track side is applied along the opposite edge primarily to equalize the effective thickness of the two edges to obtain a unifirm winding. The stripe is sometimes used for the recording of additional sound or control records.
quote:
Hugh, why put a mag track on when the optical track is there to start with. Yes like super 8 I can understand the balance stripe being there but why go to all this trouble in the first place unless as Dan says it was for another language.
Magoptical release prints having both magnetic and photographic optical sound tracks offered some advantage:
Magnetic tracks are less susceptible to dust and dirt distortion & not affected much by scratches. The magnetic stripe's additional height raises the emulsion off the base side of the next convolution of film on the roll reducing picture area frictional damage, emulsion-to-base sticking, etc. Magnetic tracks have higher fidelity sound (greater frequency response and better signal-to-noise ratio).
Optical tracks last the life of the film and cannot be easily damaged through cleaning or other maintenance of the film & no danger of accidentally erasing the track. Fidelity of optical tracks can be degraded by dirt particles and scratches. Changes cannot be made to optical tracks [after it has been printed on the film].
[ February 03, 2007, 11:19 PM: Message edited by: John A. Pommon ]
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Antique Video Transfer Service
2" Quadruplex videotape to DV/DVCAM digital transfers
5001 Diamond Hts Blvd.
San Francisco, CA 94131-1621
www.antiquevideo.com
antvid@antiquevideo.com
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Hugh McCullough
Expert Film Handler
Posts: 156
From: Old Coulsdon. Surrey. UK
Registered: Oct 2006
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posted February 04, 2007 06:48 AM
Just a thought, but as the film is a copy of a professional 35mm film it might have the two types of track for another purpose.
In the 1960s, 70s & 80s there was an experiment with both types of track being on some 35mm release prints. I ran a few of theses films.
The idea was that the film played in cinemas that could run 4 track mag sound, then the film was cleaned, and the mag track washed off. The copy was then redistributed to optical, mono, only cinemas, thereby saving money on extra prints.
Also at least one Bond film had both 3 track mag, (no surround), and an optical mono track.
This seemed to have stopped with the mass take up of Dolby optical stereo.
Could this idea have been continued with some 16mm films? Never seen it myself, but why not? There were quite a few 16mm shows doing the rounds.
quote:
There's no such thing as a 16mm stereo print - mag or optical.
Sorry Steven there is. No many I agree, but I had a Baur machine, can not remember the model, that could run mag stereo. I remember running a Russian version of Robin Hood on it, very badly dubbed, but defiantly in stereo.
As for optical stereo, my present machine has a split Dolby optical stereo cell.
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EIKI Ex 6100 xenon machine.
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John A. Pommon
Film Handler
Posts: 69
From: San Francisco, California 94131
Registered: Nov 2004
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posted February 04, 2007 11:53 PM
quote:
Sorry Steven there is. Not many I agree, but I had a Baur machine, can not remember the model, that could run mag stereo. I remember running a Russian version of Robin Hood on it, very badly dubbed, but defanately in stereo.
As for optical stereo, my present machine has a split Dolby optical stereo cell.
It's not surprising a Bauer stereo magnetic European model exists. [2 track bilateral stereo head or balance stripe as 2nd channel?]
Stereo 16mm magnetic didn't catch on in the US other than perhaps very special application or experimentally . . . . . (unlike stereo super-8mm).
Just the cost of even mono 16MM magnetic audio prints restricted thier popularity.
quote:
John that all makes sense. Just wish I had a 16mm machine with Mag playback then I could see if anything was indeed recorded on the stripe.
Kev, keep your eye on eBay . . . . do a SEARCH for an EIKI SSL-2 or ESL-2. They are a very good magnetic-optical machine. They show up once in a blue moon.
John
[ February 05, 2007, 09:33 AM: Message edited by: John A. Pommon ]
--------------------
Antique Video Transfer Service
2" Quadruplex videotape to DV/DVCAM digital transfers
5001 Diamond Hts Blvd.
San Francisco, CA 94131-1621
www.antiquevideo.com
antvid@antiquevideo.com
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