Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,001   Posts: 1,524,393   Online: 980
      
Results 1 to 4 of 4
  1. #1
    pierods's Avatar
    Join Date
    Dec 2007
    Shooter
    35mm
    Posts
    311

    dev temperature vs contrast

    I just finished reading a book by French author Philippe Bachelier, where he says that higher dev temperatures give film more contrast.

    On the other hand, I remember reading in "Edge of darkness" (specifically when talking about perceptol 1+3) that development is equivalent when time is corrected for higher temperatures (shorter time, that is).

    So, if I use higher temperatures for development and correct time, do I get an equivalent negative or a negative with more contrast (or somehow different)?

  2. #2
    Ian Grant's Avatar
    Join Date
    Aug 2004
    Location
    West Midlands, UK, and Turkey
    Shooter
    Multi Format
    Posts
    16,221
    Images
    148
    Both are right in a way.

    Certain types of developer, particularly MQ (Metol/Hydroquinone), don't work well at low temperatures, below 18°C, and the results are flat lifeless negatives.

    However in practice nearly all developers can be used between 20°C-30°C just adjusting the time to compensate for changes in temperature, the coefficient/amout of change is not the same for all developers.

    Ian

  3. #3
    Snapshot's Avatar
    Join Date
    Jan 2007
    Location
    Toronto, Ontario, Canada
    Shooter
    Multi Format
    Posts
    912
    I always worked with the assumption that development is equivalent when corrected for time. So far, I haven't seen anything that would contradict that assupmtion. However, I would imagine there are exceptions to the rule.
    "The secret to life is to keep your mind full and your bowels empty. Unfortunately, the converse is true for most people."

  4. #4
    df cardwell's Avatar
    Join Date
    Jul 2005
    Location
    Dearborn,Michigan & Cape Breton Island
    Shooter
    Multi Format
    Posts
    3,342
    Images
    8
    The only exceptions when, as Ian points out, some developing agents are inactive at cooler temperatures.

    Bachelier and Thornton were talking about the same thing, but to different purpose.



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin