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» Film-Tech Forum ARCHIVE   » Operations   » Ground Level   » Diagonal Scratches

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                     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. ------------------ This one time, at Projection Camp, I stuck a xenon bulb....  |  IP: Logged Dave Williams Wet nipple scene Posts: 1836 From: Salt Lake City, UT, USA Registered: Jan 2000 posted 06-12-2002 07:04 PM                        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  |  IP: Logged Joe Redifer You need a beating today Posts: 12859 From: Denver, Colorado Registered: May 99 posted 06-12-2002 07:07 PM                        Dave- Please explain. I am curious. Was it a loop problem?  |  IP: Logged Ken Lackner Phenomenal Film Handler Posts: 1907 From: Atlanta, GA, USA Registered: Sep 2001 posted 06-12-2002 07:42 PM                     I have Big Sky P-Series film transport (platters), Kinoton PK60D projectors, and Big Sky failsafes. Sorry, this should have been in FHF.  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 06-12-2002 08:43 PM                     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.  |  IP: Logged

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