Downrating/uprating film

Discussion in 'Medium Format Cameras and Accessories' started by JDF, Oct 11, 2013.

  1. JDF

    JDF Member

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    Hi, How do i uprate and downrate film using a medium format camera. Do I have to to anything with the settings and so on.
    Thanks for any help.
     
  2. BMbikerider

    BMbikerider Member

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    Just alter the ISO rating on your meter. so if you are using say a 100ISO film, to uprate it set it to 125 or above. To down-rate it set it tom 80ISO or lower. Be aware though uprating and down-rating film will need the development to altered too. Less time for downrating and more time for uprating.
     
  3. JDF

    JDF Member

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    Thanks for your reply BMbikerider. What the difference with push/pull.
     
  4. TheToadMen

    TheToadMen Subscriber

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  5. markbarendt

    markbarendt Subscriber

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    Push and pull change the contrast rate. The effect will normally be visible in a print in the amount of detail that prints and the "snap" of the print.

    Changing the rating changes the placement of your subjects in relation to the film curve but that change is not necessarily visible in the print. For example I can easily shoot Delta 400 at ratings from 50 to 1000 and make prints that are nearly indistinguishable across that whole range.
     
  6. jnanian

    jnanian Advertiser

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    hey djf


    it is altering the development push / pull has to do with ... leave it in the developer less when exposing the film more is pulling, and developing more when giving the film less exposure is push ...

    yeah, what mark said :smile:

    sometimes you do film tests(play with the film) and you realize, a film rated for 125 comes out best if you expose at 50 and develop "normally" its all about personal preference.

    have fun!
    john
     
  7. TheToadMen

    TheToadMen Subscriber

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    +1

    A negative with lesser contrast (from pulling) can easily be given more contrast in post production (in digital work flow after scanning or while printing in the real dark room). However, more/too much contrast from pushing is not that easy compensated (if needed/wanted).

    In general pulling will give lesser grain and pushing will give more grain. Choice of film & developer might also influence this. But for now I wouldn't pay too much attention to this factor unless the results really annoy you. (BTW: grain is a dangerous subject in many discussions, often with many myths, (dis)believers fighting, false facts, emotions and many contradicting opinions ... be warned).
    :munch:

    With colour film there might also be a shift in colour - which can be nice - sometimes also combined with cross processing. My (very limited) experience on this matter is better with Fuji films than with Kodak films.

    Do experiment and do register how the film was rated, exposed, developed, printed, etc., so you can reproduce the "effect" and develop your own style. Try to change only one variable at a time, so you know what variable caused what effect.

    And don't forget to have fun!!
     
    Last edited by a moderator: Oct 11, 2013
  8. TheToadMen

    TheToadMen Subscriber

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    BTW:

    JDF - welcome to APUG !!!!
     
  9. JDF

    JDF Member

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    Many thanks for all your help and welcomes. :smile: