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Thread: Film base

  1. #21
    Aurum's Avatar
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    Quote Originally Posted by ath View Post
    The firebrigade of Laxenburg / Austria investigating the possibilities to extinguish burning nitrofilm in 1965: http://video.google.de/videoplay?doc...arch&plindex=1
    If anyone has any waste Nitrate base left I could do with some next time I need to light the Barbeque!

    The Water fairies hit it with everything they had and it still stuck up two fingers at them :o
    "Flatter Me, and I May Not Believe You. Criticize Me, and I May Not like You. Ignore Me, and I May Not Forgive You. Encourage Me, and I Will Not Forget You."

  2. #22

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    I actually have 100 feet of it in the freezer; unexposed Panchromatic Negative stock (Kodak motion picture -- forget type) from the 30's. Base plus fog is about .30!

  3. #23

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    Quote Originally Posted by Kino View Post
    I am trying to think of a single type of film still available off the shelf that is acetate and cannot.

    You can special order acetate from Kodak in motion picture emulsions, but you have to buy 100,000 feet minimum if there are no remaining stocks ...
    I have used a bit of 35mm motion picture film. All of the film I have come across recently appears to be acetate. It is easily torn if required....essential in my experience loading a motion picture film magazine. My understanding is that acetate is also essential as it will tear not strip the $200K movie cameras gears.

    Small quantities (100ft) of surplus 35mm film is available from many companies for minimal cost. These are re-cans or "short ends".
    http://www.stockoptionscorp.com/
    http://certifiedfilm.com/
    http://www.releasing.net/rawstock/
    And an article on same...not by me.
    http://www.scottspears.net/shortendsarticle.htm

    The Kodak motion picture products catalogue shows the films that are polyester or estar. Mostly print rather than neg film.
    http://www.kodak.com/US/plugins/acro...eteCatalog.pdf

    Hope this helps somemone.

    Emulsion

  4. #24

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    Did not see the question for me : So sorry for the delay

    We coat miniature and roll film on tri-acetate, sheet film on polyester :

    We would never coat miniature or roll on polyester, due to the hightened
    possibility of camera damage, polyester does not tear and therefore in our
    opinion is not suitable for a camera film base, so we do not use it.

    POLYESTER is OK for lots of other miniature applications such as aerial / surveillance
    etc. etc. and its thinner so it has other advantages in certain applications

    Regards Simon ILFORD Photo / HARMAN technology Limited :

  5. #25
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    Dear Simon,

    I agree with you concerning the 35mm format : if it can't tear, you can damage camera. But in 120, what is the problem?
    Aurelien, Analog Photographer

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  6. #26

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    Well, what do you know? I stand corrected!

    As to camera damage, never saw it in 13 years of about 1 million feet of polyester a year through precision Oxberry and Mitchell camera movements in our optical printers and film recorder.

    Only damage I ever saw as a direct result of polyester was a bent film processing rack on our continuous processing machine.

    But, it never hurts to be safe, I guess...

  7. #27
    Photo Engineer's Avatar
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    I have seen camera damage as posted here and elsewhere.

    Kodak follows the same guidelines as Ilford in film base use. The only place polyester is used is in space photography where weight and film length is of concern. Kodak coated on 2 mil (0.002") support or thinner to meet NASA specs.

    PE

  8. #28
    Steve Smith's Avatar
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    Quote Originally Posted by Photo Engineer View Post
    Kodak coated on 2 mil (0.002") support or thinner to meet NASA specs.
    I bet that involved some challenges. Our printers complain if we quote a job on anything thinner than 0.004" polyester.


    Steve.
    "People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.

  9. #29
    Michel Hardy-Vallée's Avatar
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    Quote Originally Posted by Aurelien View Post
    I agree with you concerning the 35mm format : if it can't tear, you can damage camera. But in 120, what is the problem?
    To avoid damage on motorized 120 backs?
    Using film since before it was hip.


    "One of the most singular characters of the hyposulphites, is the property their solutions possess of dissolving muriate of silver and retaining it in considerable quantity in permanent solution" — Sir John Frederick William Herschel, "On the Hyposulphurous Acid and its Compounds." The Edinburgh Philosophical Journal, Vol. 1 (8 Jan. 1819): 8-29. p. 11

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  10. #30
    David A. Goldfarb's Avatar
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    Not just motorized backs. Some cameras (Pentacon 6, Mamiya 6, Bronica S and S2) are known for having film advance issues or potential for stripped gears.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

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