Ortho Films

Discussion in 'Darkroom Developing and Printing' started by Greg \_\, Apr 18, 2006.

  1. Greg \_\

    Greg \_\ Guest

    Greg \_\, Apr 18, 2006
    #1
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  2. I think you must write to J&C to find out exactly what
    this is. They start by saying it is an orthochromatic
    version of PL-25, which is supposed to be similar to Agfa
    APX-25, Panatomic-X, and similar films but then state it is
    suitable for document copying and has extremely high
    resolution. These two statements are in conflict. Films like
    APX-25 and the old Adox films, are very fine grain, single
    coated, standard contrast panchromatic films intended for
    pictorial photography with normal developers. Lithographic
    films are extremely high contrast in any developer and are
    usually developed in solutions that make full use of this
    effect. They are mainly used for copying line material.
    There is a class of very high contrast, but still continuous
    tone, materials used for various copying chores. These can
    sometimes be used for pictoroal purposes with special very
    low contrast developers. The description of this film makes
    me think it is of this type. Both lith and high contrast
    "commercial" films were made in all three color
    sensitization classes although most of the high contrast
    stuff was either non-color sensitized (senstive only to blue
    light) or orthochromatic.
    At one time orthochromatic films were offered in all
    types: they were popular for press work and for portraits of
    men where the lack of red sensitivity brought out skin
    textures.
    I could not fine any curves or other data on the J&C web
    site but they may have them and can tell you what exactly
    this is.
     
    Richard Knoppow, Apr 18, 2006
    #2
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  3. Greg \_\

    Greg \_\ Guest

    Thanks Richard!
     
    Greg \_\, Apr 18, 2006
    #3
  4. I suspect that the film is closer to the old Agfa Ortho 25 than APX 25.
     
    Keith Tapscott, Apr 18, 2006
    #4
  5. Greg \_\

    Mike King Guest

    Mike King, Apr 18, 2006
    #5
  6. Greg \_\

    Greg \_\ Guest

    Thanks Mike!
     
    Greg \_\, Apr 19, 2006
    #6
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