Welcome to the new Film-Tech Forums!
The forum you are looking at is entirely new software. Because there was no good way to import all of the old archived data from the last 20 years on the old software, everyone will need to register for a new account to participate.
To access the original forums from 1999-2019 which are now a "read only" status, click on the "FORUM ARCHIVE" link above.
Please remember registering with your first and last REAL name is mandatory. This forum is for professionals and fake names are not permitted. To get to the registration page click here.
Once the registration has been approved, you will be able to login via the link in the upper right corner of this page.
Also, please remember while it is highly encouraged to upload an avatar image to your profile, is not a requirement. If you choose to upload an avatar image, please remember that it IS a requirement that the image must be a clear photo of your face.
Thank you!
It's not a finite answer as different platters are constructed differently with different ID and OD. For magnetic film, about 3.25-hours on a 52" deck is pretty much going to require creative affixing of the tail. Depending on the platter in use and how it regulates speed, on take up, it could be getting a bit dicey out there too as the decks are moving a bit slow. The platter has to have enough torque to handle the full deck but not jerk the little bit of film left when it is just that outer ring around the credits.
The longest I've personally seen on say a Christie AW3 was "The Right Stuff" and the suction cups that Christie suppled wouldn't fit because there wasn't enough "deck" left. That film was just under 3.25-hours.
Fortunately, 98% of the 70mm magnetic sound prints I've shown were done with reels & change-overs, but on the two occasions I've had to run one off a platter, I discovered I had to make a slight adjustment to the AW-3 speed controls when running the 70mm mag because of the increased weight of the magnetic tracks plus the fact they were printed on the older acetate base film stock, which also weighs more than the newer, mylar film. The added "stiffness" of the mag tracks also made the 'brain fingers' which regulate the platter speed, respond slightly differently, although the problem, as Steve pointed out, was most pronounced when the platter had to deal with the circumference near the end of the print.
The only place I ever had to platterize 70mm had a Kinoton ST-200. I hated the initial ramp-up, because it would start very slowly, then overspeed, and I'd have to dash over and use my hand as a brake to slow it down to prevent a brain wrap. Once it was up to a stable feed speed it was rock solid for the rest of the movie, even with Titanic (the longest feature I had to play in a single roll, which only just fitted onto the deck). But the ramp-up was scary. I'm told that Cinemeccanica platters were even worse.
Something sounds amiss if the Kinoton platter didn't ramp the speed properly. That's sort of their thing. They start the platter at the proper speed for ID of the ring. It sounds like it wasn't resetting to the show start speed. The platter did have the proper motor-run signal from the projector, didn't it?
It's entirely possible but again, you are going to have to be creative on how you hold the tail and depending on the platter make/model you might find things dicey when you get out that far.
A couple of things...1: did that exist when The Right Stuff or Malcom-X were in release. 2: what is the longest striped magnetic 70mm (acetate) have you can you run on an AW370?
I never had issues with long 70mm prints on the ORC platters they heald alot of film and if setup right were very stable The only failure point was eventually the motor brushes and the servo pots
I remember running Malcolm X at the university in 70mm way back. It was just a single show, so we ran it in changeover, since we didn't even try to fit it on the platter as we had doubts it could comfortably fit on there.
I guess those tail-protectors are a relatively new invention , I doubt they were around when The Right Stuff was in release, at least not with Film-Tech branding on them.
Tweet
Comment