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This topic comprises 4 pages: 1 2 3 4
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Author
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Topic: Filmguard in So. Cal?
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Joe Redifer
You need a beating today
Posts: 12859
From: Denver, Colorado
Registered: May 99
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posted 07-17-2002 07:06 PM
I don't blame you for wanting to see the results in action before you try it, and hopefully you will be able to. But trust me, the stuff works. It does a great job cleaning up old prints, but it is really best if you put FG on a print starting on day one and try to use it as much as you can (don't overdo it) throughout the life of the print. When the print becomes "old" then you will see how good it looks compared to other old, non-FG'd prints at your complex.Also, if applying FG to an old dirty print, don't expect instant results and start over applying FG when you still see dirt after the first application. Depending on how dirty the old print is, you may have to give it a few days to a week of normal FG use before you really start seeing the difference. Oh, and I don't recommend using PTR's on a print that has been FilmGuarded. Or at all for that matter. The performance/maitenence ratio (maitenence being the cleaning that must occur between every use) is just to horrible to advocate the use of PTRs in any way, shape or form.
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 07-17-2002 09:54 PM
PTRs are an effective film cleaner with very low risk of film damage. Since no chemicals are used or applied to the film, they can be used for cleaning printing originals (printers, telecines, processing machines) or films that come in contact with optical components (e.g., PTRs are widely used in IMAX projection systems).With normal levels of dirt on the film, they need to be cleaned between shows, which can be done quickly by "see-sawing" low stick adhesive tape to remove the dirt that they took off the film. Highly abraded or very dirty prints can "load up" the PTRs faster, requiring several passes to clean the print. PTRs do not claim to lubricate the print, or act as a "wet gate" to hide scratches. Kodak introduced PTR film cleaning in 1989. Kodak (FPC) and other vendors (e.g., Magnasonics, San Lab Systems, Kelmar, Speco) supply PTR film cleaning technology to thousands of satisfied users.
http://www.fpcfilm.com/US/en/motion/FPC/fpc/ptr_main.html
http://www.fpcfilm.com/US/en/motion/FPC/fpc/ptr_prod.html ------------------
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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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 07-18-2002 10:00 AM
PTRs were developed to provide an alternative to the DRY media web cleaners (e.g., 3M, Christie, Kelmar), which were about the only on-line cleaner available to theatres at the time (1989). DRY media web cleaners have a high risk of scratching the film if they pick up abrasive dirt, PTRs do not. Media cleaners require media replacement, PTRs can be washed and reused, allowing them to clean millions of feet of film before needing replacement.Used properly, PTRs are very effective in removing loose particulate dirt from film, and have such low risk of damaging film that they are routinely used on irreplaceable camera negatives. PTRs are a film CLEANER, plain and simple. They are not a film TREATMENT having additional properties like lubrication or scratch hiding.
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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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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 07-18-2002 09:21 PM
Here's info about the 3M web cleaner:
http://www.challengercomponents.com/web/
http://www.northeastphoto.com/fabric.html The 3M film cleaner was the "grandaddy" of the Christie and Kelmar dry media cleaners. The woven media roll was driven by a separate motor, rather than geared down from a film-driven roller. ------------------
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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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 07-19-2002 02:26 PM
Particles transfer back to the print only if the PTRs get overloaded with dirt from a print that is being badly abraded by the projector, or an old print that has never been cleaned. In our theatre tests of PTRs in 1989, just a few passes of the print got most of the dirt off, and then the PTRs were perfectly capable of keeping the print clean without the dirt particles transferring back to the film. The bad experience cited by Joe in his review was related to the heavy level of projector abrasion/dusting his theatre was experiencing at that time. ------------------
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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Bernard Tonks
Jedi Master Film Handler
Posts: 619
From: Cranleigh, Surrey, England
Registered: Apr 2001
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posted 07-20-2002 11:01 AM
Gracia wrote: quote:
What I discovered about PTRs is this:
yes, they do transfer particles, from one part of a print to another part of a print.
John wrote: quote:
The bad experience cited by Joe in his review was related to the heavy level of projector abrasion/dusting his theatre was experiencing at that time.
SPECO supply a special PTR assembly so that the PTR rollers can be changed whilst running film, which is useful on first runs or particularly dirty film.
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