This is topic Diagonal Scratches in forum Ground Level at Film-Tech Forum ARCHIVE.
To visit this topic, use this URL:
https://ft-forum.com/ft/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=5;t=000544
Posted by Ken Lackner (Member # 1002) on 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....
Posted by Dave Williams (Member # 299) on 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
Posted by Joe Redifer (Member # 3) on 06-12-2002, 07:07 PM:
Dave-Please explain. I am curious. Was it a loop problem?
Posted by Ken Lackner (Member # 1002) on 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.
Posted by Brad Miller (Member # 2) on 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.