Densitometers-Exactly whats the purpose/darkroom use (please educate me!)

Discussion in 'Darkroom Developing and Printing' started by J. Burke, Sep 6, 2003.

  1. J. Burke

    J. Burke Guest

     
    J. Burke, Sep 6, 2003
    #1
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  2. J. Burke

    Frank Pittel Guest

    I use my densitometer when running film speed and development tests.
    I do have to admit that it spends most of the time sitting on a shelf
    in the closet with my grey cards.

    --




    Keep working millions on welfare depend on you
     
    Frank Pittel, Sep 6, 2003
    #2
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  3. A densitometer measures the density of the silver deposit
    or dye in an emulsion. If this is useful for measuring
    minimum and maximum densities to measure the contrast of the
    image.
    When the film is exposed to a step tablet the resulting
    density measurements can be graphed to show the film
    characteristic.
    Color densitometers measure density at three colors,
    generally those to which printing materials are sensitive.
    It can determine not only overall contrast but can also
    measure the matching of the three color emulsions.
    Densitometers can be useful for anything from simple
    measurements of printing contrast of B&W negatives to color
    balance determination and emulsion research.
    The simplest ones are no more than a photocell, controlled
    lamp, and calibrated meter.
     
    Richard Knoppow, Sep 6, 2003
    #3
  4. J. Burke

    John Guest

    Before or after you do lunch ?

    ;>)

    Regards

    John S. Douglas, Photographer
    http://www.darkroompro.com
     
    John, Sep 9, 2003
    #4
  5. J. Burke

    D Poinsett Guest

    I use my densitometer from time to time to calibrate film and paper using a
    step tablet as described elsewhere. I also use it regularly when making
    unsharp masks from B&W prints. By reading the density range of the negative,
    I can quickly determine the exposure needed for the mask. Before I started
    making these masks, I had little direct use for a densitometer although I
    must admit that having one has been instrumental in understanding the
    behavior of film and paper and the effects of various processing variables
    in a hands-on way.

    Mr. Knoppow's post neatly summarizes the purpose and general use of a
    densitometer.
     
    D Poinsett, Sep 9, 2003
    #5
  6. J. Burke

    Dan Quinn Guest

    For film, it should be pointed out, a step tablet is not necessary.
    I use an evenly lighted gray card when testing 120 roll film. Dan
     
    Dan Quinn, Sep 9, 2003
    #6
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