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» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » Diagonal Scratches (Page 1)

 
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Author Topic: Diagonal Scratches
Ken Lackner
Phenomenal Film Handler

Posts: 1907
From: Atlanta, GA, USA
Registered: Sep 2001


 - posted 06-12-2002 06:49 PM      Profile for Ken Lackner   Email Ken Lackner   Send New Private Message       Edit/Delete Post 
I know that small diagonal scratches towards the right side of the screen are "platter scratches." I was just wondering if there is anything else that could cuase this type of scratch. Is there anything at the lab that could cause diagonal scratches before the print even gets to the theater? And is there anythinig in the film path that could cause such scratches? thx.

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This one time, at Projection Camp, I stuck a xenon bulb....

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Dave Williams
Wet nipple scene

Posts: 1836
From: Salt Lake City, UT, USA
Registered: Jan 2000


 - posted 06-12-2002 07:04 PM      Profile for Dave Williams   Author's Homepage   Email Dave Williams   Send New Private Message       Edit/Delete Post 
What kind of equipment are you running? I had a simplex XL that used to do the same thing just out of the film gate.

Dave

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Joe Redifer
You need a beating today

Posts: 12859
From: Denver, Colorado
Registered: May 99


 - posted 06-12-2002 07:07 PM      Profile for Joe Redifer   Author's Homepage   Email Joe Redifer   Send New Private Message       Edit/Delete Post 
Dave-

Please explain. I am curious. Was it a loop problem?

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Ken Lackner
Phenomenal Film Handler

Posts: 1907
From: Atlanta, GA, USA
Registered: Sep 2001


 - posted 06-12-2002 07:42 PM      Profile for Ken Lackner   Email Ken Lackner   Send New Private Message       Edit/Delete Post 
I have Big Sky P-Series film transport (platters), Kinoton PK60D projectors, and Big Sky failsafes.

Sorry, this should have been in FHF.

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Brad Miller
Administrator

Posts: 17775
From: Plano, TX (36.2 miles NW of Rockwall)
Registered: May 99


 - posted 06-12-2002 08:43 PM      Profile for Brad Miller   Author's Homepage   Email Brad Miller       Edit/Delete Post 
Generally those type of scratches come from the last roller in the takeup of the platter being too low to where the film rubs up and over the edge of the platter deck. Those rollers should always be as high as possible. Ideally film should be taken up on the platter with the bar raised (speaking of a Christie here, most platters do not offer this option). Then the bar should be slowly lowered until you reach the point where the film lays against the deck. This is the optimum position. Sure the roller can be set lower without scratching, but the lower you go, the better chance your film will get scratched if the deck becomes warped from misuse.

To answer your question though, an out of line roller will make those same scratches. That's got to be a pretty badly aligned roller to do that though, so it should take no more than 2 seconds to find it.

The only other thing would be a projector loop scratch, but generally those are toward the middle of the picture and not on the edge.

Moving to FHF.


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Ken Lackner
Phenomenal Film Handler

Posts: 1907
From: Atlanta, GA, USA
Registered: Sep 2001


 - posted 06-12-2002 09:11 PM      Profile for Ken Lackner   Email Ken Lackner   Send New Private Message       Edit/Delete Post 
To my knowledge, the rollers on the tree of Big Sky platters are not adjustable. If it was a platter scatch, it probablly happened during buildup.

I thought loop scratches would be vertical, or the dots that rise up the screen.


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Paul G. Thompson
The Weenie Man

Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000


 - posted 06-12-2002 09:19 PM      Profile for Paul G. Thompson   Email Paul G. Thompson   Send New Private Message       Edit/Delete Post 
Ken, I have seen some Brenkerts do the same thing because the film stripper for the intermittant sprocket was sprung all to shit. I suppose it is possible on the XL movement, if the loop is too big. However, I have to admit I never had that happen on the XL.

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Chad Souder
Jedi Master Film Handler

Posts: 962
From: Waterloo, IA, USA
Registered: Feb 2000


 - posted 06-12-2002 09:21 PM      Profile for Chad Souder   Email Chad Souder   Send New Private Message       Edit/Delete Post 
I've found it more common to cause those scratches during make-up, because most muts have that last roller adjustable to any heighth, and that's the one that has a tendency of working its way down if its not watched.

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Paul G. Thompson
The Weenie Man

Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000


 - posted 06-12-2002 09:27 PM      Profile for Paul G. Thompson   Email Paul G. Thompson   Send New Private Message       Edit/Delete Post 
Chad, that is why I prefer the old horizontal top MUT's adjusted to the correct fixed height, and fixed so it cannot be re-adjusted either by accident or whatever. Then, I take all those stupid rollers and springs off the horizontal top and toss them in the trash, or use them as spares.

I have never seen or damaged a film with scratches by using the straight shot method, and I say "Poop on all those extra un-needed rollers!"

Yes, you might be limited to building up or tearing down on the center platter, but if you plan ahead, there should be no problem. On build up night, I always keep the center platter open for building up or tearing down.


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Ken Lackner
Phenomenal Film Handler

Posts: 1907
From: Atlanta, GA, USA
Registered: Sep 2001


 - posted 06-12-2002 10:05 PM      Profile for Ken Lackner   Email Ken Lackner   Send New Private Message       Edit/Delete Post 
quote:
I've found it more common to cause those scratches during make-up, because most muts have that last roller adjustable to any heighth, and that's the one that has a tendency of working its way down if its not watched.

That's usually what I associate the problem with, but I just wanted to see if there were other causes before I needlesly blame someone for it. Also, I never noticed these scratches when walking the booth, but they were quite noticeable today when I watched this particular movie. So either they were there but I did not see the before, or they are new, which would mean the cause was not building up incorrectly.


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Paul G. Thompson
The Weenie Man

Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000


 - posted 06-12-2002 10:21 PM      Profile for Paul G. Thompson   Email Paul G. Thompson   Send New Private Message       Edit/Delete Post 
Probably a mis-thread or a roller derail....

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Brad Miller
Administrator

Posts: 17775
From: Plano, TX (36.2 miles NW of Rockwall)
Registered: May 99


 - posted 06-12-2002 11:00 PM      Profile for Brad Miller   Author's Homepage   Email Brad Miller       Edit/Delete Post 
Paul, I say poop on MUTs alltogether. Get a Goldberg platter reel for your buildup!

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Paul G. Thompson
The Weenie Man

Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000


 - posted 06-12-2002 11:14 PM      Profile for Paul G. Thompson   Email Paul G. Thompson   Send New Private Message       Edit/Delete Post 
But Brad, I don't have a bench rewind.....


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Joe Redifer
You need a beating today

Posts: 12859
From: Denver, Colorado
Registered: May 99


 - posted 06-13-2002 12:36 AM      Profile for Joe Redifer   Author's Homepage   Email Joe Redifer   Send New Private Message       Edit/Delete Post 
You must go nuts when you get in a reel that is tails out.

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Adam Wilbert
Jedi Master Film Handler

Posts: 590
From: Bellingham, WA, USA
Registered: Mar 2002


 - posted 06-13-2002 01:22 AM      Profile for Adam Wilbert   Author's Homepage   Email Adam Wilbert   Send New Private Message       Edit/Delete Post 
Joe, the horizontal muts that paul and I use have two spindles for rewinding. The only problem is that a 6000' reel won't fit on the table with a 2000' on the other spindle.

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