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Author Topic: STAR WARS II - Picture movement on screen
Jamie Sanson
Film Handler

Posts: 33
From: Port Macquarie,NSW, Australia
Registered: Feb 2002


 - posted 05-23-2002 03:44 AM      Profile for Jamie Sanson   Email Jamie Sanson   Send New Private Message       Edit/Delete Post 
Since we have commenced screening Star Wars II, the picture moves vertically up and down throughout the feature intermittently. I have checked all the usual "suspects", such as gate, gate runners, gate tension and intermit sprocket. At first I thought it was the projector, but can find no fault so I believe it must be the print. The projector is a VIC 8.

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John Wilson
Film God

Posts: 5438
From: Sydney, Australia.
Registered: Dec 1999


 - posted 05-23-2002 06:18 AM      Profile for John Wilson   Email John Wilson   Send New Private Message       Edit/Delete Post 
Hi Jamie and welcome aboard

Are your ads and trailers doing the jump thing also?

There are scenes in SW that move around and yet others that are steady as a rock.

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"It's not the years honey, it's the mileage". - Indiana Jones.

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Ron Lacheur
Jedi Master Film Handler

Posts: 650
From: British Columbia, Canada
Registered: Feb 2002


 - posted 05-23-2002 11:46 AM      Profile for Ron Lacheur   Email Ron Lacheur   Send New Private Message       Edit/Delete Post 
We have all Vic 8's at my work, and Ep2 is running A+ on all of them. But I have noticed on the ending credits on all features seem to shake a bit vertically.

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Bobby Henderson
"Ask me about Trajan."

Posts: 10973
From: Lawton, OK, USA
Registered: Apr 2001


 - posted 05-23-2002 06:02 PM      Profile for Bobby Henderson   Email Bobby Henderson   Send New Private Message       Edit/Delete Post 
Obi Wan's eye floats up and down on his face in one scene. I mentioned this in another post though.

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Manny Knowles
"What are these things and WHY are they BLUE???"

Posts: 4247
From: Bloomington, IN, USA
Registered: Feb 2002


 - posted 05-23-2002 06:13 PM      Profile for Manny Knowles   Email Manny Knowles   Send New Private Message       Edit/Delete Post 
Ron: For what it's worth, I have noticed a small, yet discernible amount of "jump" (vertical instability) during tail credits on every projector I have ever worked with.

Tail credits reveal this problem moreso than actual footage because the movement of credits is uniform and predictable. Obviously, static credits (aka "title cards") would reveal this even more. The point is that you may not really have a problem.

In order to rule out the existence of a mechanical fault, you'd first need to measure the severity of the jump in your projector. Among its many uses, the SMPTE 35-PA (aka RP-40) test film is designed to help determine if your projector is within the specified tolerance limit for jump (and also "weave" which is the side-to-side equivalent).

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~Manny.

Now...where was I ?
Leonard Shelby, MEMENTO.


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Jamie Sanson
Film Handler

Posts: 33
From: Port Macquarie,NSW, Australia
Registered: Feb 2002


 - posted 05-24-2002 03:48 AM      Profile for Jamie Sanson   Email Jamie Sanson   Send New Private Message       Edit/Delete Post 
Thanks guys for the feedback on SW. The projector is rock steady on other prints. I have notified FOX Film Distributors and are aware of other problems at various locations around the same copy number as 146.

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Pete Naples
Phenomenal Film Handler

Posts: 1565
From: Dunfermline, Scotland
Registered: Feb 2001


 - posted 05-24-2002 11:15 AM      Profile for Pete Naples   Email Pete Naples   Send New Private Message       Edit/Delete Post 
I'm sure I read something about this before, I think John P. posted some links about it (surprisingly!), basically most end credits are printed at very high speed, and the results can sometimes be less than stable.

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John Pytlak
Film God

Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000


 - posted 05-24-2002 12:31 PM      Profile for John Pytlak   Author's Homepage   Email John Pytlak   Send New Private Message       Edit/Delete Post 
One possible source of vertical unsteadiness is the common practice of using a continous contact printer to print a short pitch original to a short pitch raw stock, such that there is slippage in the printer gate. Continuous contact printers require a short pitch original and a long pitch raw stock for optimum steadiness. Otherwise, a pin-registered step printer should be used, such as for printing a long-pitch master positive to a short-pitch duplicate negative:
http://www.kodak.com/US/en/motion/support/h1/sizesP.shtml#perfs

On some continous contact printers, improper adjustment of the tensioning of the film as it goes over the printing sprocket can cause intermittent vertical unsteadiness.

One quick, sure way to tell if the unsteadiness is from your projector is to pull the aperture plate, and project the edges of the print's perforations. If the print perfs are "rock steady" and the image is moving around, the unsteadiness was printed in.

------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: +1 585 477 5325 Cell: +1 585 781 4036 Fax: +1 585 722 7243
e-mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion


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