Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,224   Posts: 1,532,610   Online: 891
      
Page 1 of 3 123 LastLast
Results 1 to 10 of 24
  1. #1
    Ian Grant's Avatar
    Join Date
    Aug 2004
    Location
    West Midlands, UK, and Turkey
    Shooter
    Multi Format
    Posts
    16,234
    Images
    148

    Film base & potential 35mm camera damage

    With a growing number of alternative 35mm films now being marketed on Polyester film base just how safe are they for conventional still camera use.

    On last years Ilford factory tour the Chairman, Howard Hopwood made it clear that under no circumstances would the company supply 35mm camera film on a Polyester base again. He pointed out that prior to his joining the company Ilford had been making & selling special 72ex 35mm film on a thin polyester base, while he didn't say the full extent of the problem the films was withdrawn, some cameras were damaged.

    He also pointed out that no major manufacturer used polyester film base for 35mm film.

    Acetate film will tear if there's a film transport problem, usually at the sprocket holes, but Polyester is too strong and damage can occur to the transport/wind mechanism, potentially worse with a high speed motor drive.

    Are the manufacturers selling us film on Polyester base irresposnsible ?

    Ian

  2. #2

    Join Date
    Jan 2005
    Location
    Live Free or Die
    Shooter
    Multi Format
    Posts
    4,369
    Images
    88
    It's a valid debate, but I'm not sure to what degree it's a pratical problem. For a manually operated camera, you have to force the mechanism seriously hard to tear the sprocket holes on acetate films. Hopefully, most people would stop and try to figure out what's wrong. For a motor driven camera, the motor stops at the end of the roll when it senses the resistance, this is part of its normal operation. I'm guessing most motor drives would do the same with a jam.

  3. #3
    bobwysiwyg's Avatar
    Join Date
    Mar 2008
    Location
    Ann Arbor, MI U.S.A.
    Shooter
    Multi Format
    Posts
    1,554
    Images
    3
    I'm obviously biased, since I don't own any cams with automated load/advance mechanisms, or motor drives, I guess I'm just glad they are still producing film, period.
    WYSIWYG - At least that's my goal.

    Portfolio-http://apug.org/forums/portfolios.php?u=25518

  4. #4
    Alex Bishop-Thorpe's Avatar
    Join Date
    Jul 2006
    Location
    Adelaide, South Australia
    Shooter
    Multi Format
    Posts
    1,455
    Images
    29
    Raise your hand if you've ever had a camera damaged by polyester film, I guess. It's not something I've encountered personally, but I'm interested to see under what exact circumstances it could happen. The only problem I've found with polyester based film is that you cant rip it when you're fussing about in the dark and cant find the damn scissors.
    The Analogue Laboratory, or 'so you built a darkroom in an old factory in the industrial zone'.
    Blog thing!.

    Worry less. Photograph more.

  5. #5
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    22,972
    Images
    65
    I have only seen motion picture cameras severly damaged by polyester film support. Generally, the motor jams in a regular camera due to the slow speed and low torque. This still will damage a small camera though, but I've never seen nor heard of it.

    Imagine what a jam will do to a coating machine moving at high speed! Now that I have heard of.

    PE

  6. #6
    Prest_400's Avatar
    Join Date
    Jan 2009
    Location
    Spain
    Shooter
    Med. Format RF
    Posts
    534
    Quote Originally Posted by Photo Engineer View Post

    Imagine what a jam will do to a coating machine moving at high speed! Now that I have heard of.

    PE
    That sounds like some serious problem for the manufacturer; Big time and economic losses. I don't think it's easy to repair those huge machines.

    A negative characteristic of polyester I've heard of, is that light can pass through the film, and it exposes some of the first exposures. Acetate doesn't.
    Something like this:
    http://www.flickr.com/photos/medienfrech/2295667811/

  7. #7
    Ian Grant's Avatar
    Join Date
    Aug 2004
    Location
    West Midlands, UK, and Turkey
    Shooter
    Multi Format
    Posts
    16,234
    Images
    148
    One reason we've not heard about damage to 35mm cameras recently is there were virtually no polyester based conventional 35mm films available, since Ilford withdrew the 72ex film.

    For commercial film making taking stock is acetate based, print film is usually Polyestr based. That goes for most manufacturers even Orwo/Filmotec.

    Problems are likely to occur with older cameras where transport mechanisms are worn, and also less well made camera's, but they will happen and it may well be that the photographers don't appreciate that the film base contributed to the problem.

    Ian

  8. #8
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    22,972
    Images
    65
    Quote Originally Posted by Prest_400 View Post
    That sounds like some serious problem for the manufacturer; Big time and economic losses. I don't think it's easy to repair those huge machines.

    A negative characteristic of polyester I've heard of, is that light can pass through the film, and it exposes some of the first exposures. Acetate doesn't.
    Something like this:
    http://www.flickr.com/photos/medienfrech/2295667811/
    This is due to the lack of an attenuating material in the film support. Kodak and others use dyes or carbon suspended in the support matrix to attenuate light and prevent piping lengthwise.

    PE

  9. #9

    Join Date
    Oct 2004
    Location
    Rome, Italy
    Shooter
    35mm
    Posts
    884
    Another reason to avoid Rollei films (the polyester base)...

  10. #10
    Ian Grant's Avatar
    Join Date
    Aug 2004
    Location
    West Midlands, UK, and Turkey
    Shooter
    Multi Format
    Posts
    16,234
    Images
    148
    Quote Originally Posted by Alessandro Serrao View Post
    Another reason to avoid Rollei films (the polyester base)...
    The company does need to address the issue.

    Ian

Page 1 of 3 123 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin