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  1. #1

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    Is there a way to shoot a paper negative at ISO 100?

    Is there a way to shoot a paper negative at ISO 100? I know, "Use Film" - not the answer I need though...
    I am working on a project where I need to use photo paper. I'm not restricting myself to commercial papers for this project (although that would be ideal).
    I will consider a special order or using an emulsion, but I dont know where to start.
    It has been suggested that "Ultrafine" papers are ISO 12, and some Kodak papers are higher again.
    Any ideas?

  2. #2
    maarten m's Avatar
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    why you need to shoot at 100iso?

  3. #3

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    some papers are native iso of 50.

    if you don't mind experimenting, you might be able to speed up your paper
    by fuming it in a peroxide box .
    it boosts the iso of film, so who knows what it might do for paper

    i have asked people about doing it with paper and no one responded,
    but people have been doing it with film for a long long time ...

    http://www.apug.org/forums/forum37/4...s-exist-2.html


    good luck !
    john

  4. #4

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    Hi John - do you know what papers might be at 50 ISO?

  5. #5
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    Kentmere is pretty fast but not that fast.

    You can buy liquid emulsions. I don't know how fast they are but if you're into chemistry, you can add sensitising dyes (go read the "emulsion making" threads, I've no idea of what's required or whether it's possible to boost sensitivity on a commercial emulsion or whether you need to start from scratch) that will improve speed and spectral sensitivity.

    You could gain a little additional speed by preflashing to get the image off the toe of the paper. The paper-neg will look greyer and your available dynamic range will be reduced but assuming you're going to contact-print the paper neg onto another paper to get a positive, that should help the original-capture speed.

  6. #6

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    Quote Originally Posted by mkillmer View Post
    Hi John - do you know what papers might be at 50 ISO?
    hey there

    i was a little bit off, sorry, its iso 25, and its ilford ... still better than iso 6

    http://www.apug.org/forums/forum62/5...so-rating.html


    john

  7. #7

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    Why do you need paper at iso100?
    * Just because your eyes are closed, doesn't mean the lights in the darkroom are off. *
    * When the film you put in the camera is worth more than the camera you put the film in... *
    * When I started using 8x10, it amazed me how many shots were close to the car. *

  8. #8
    piu58's Avatar
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    > Kentmere is pretty fast but not that fast.

    It is the fastest paper I know.

    > You could gain a little additional speed by preflashing

    Two stops are possible this way, but not much more.
    ---
    Uwe Pilz

  9. #9
    polyglot's Avatar
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    According to PE in that other thread, the Ilford is "about 25" but it will depend of course on the spectrum present in the scene. In my experience, Kentmere VC Select (and Fineprint FB) is about 1 stop faster than Ilford, so you probably get ISO50. Not sure if PE's testing involved preflashing but if it didn't, you might reach ISO100. Maybe. Note that there are a whole bunch of others in that thread saying "no, it's between 3 and 10".

    Why don't you try it out with some bracketing?

  10. #10

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    papers vary depending on the paper and the light.
    graded papers i have used are very slow
    gaslight papers, very slow
    bottled emulsions, some are slow, some were fst ( luminos was about asa 100 )

    i wish i had peroxide and a box, i'd fume my paper and see what happens, since it
    has been known to work with film, it seems like a good bet to work with paper.

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