TMY-2 Development Time Testing

Discussion in 'B&W: Film, Paper, Chemistry' started by AgCl4ever, Jul 31, 2011.

  1. AgCl4ever

    AgCl4ever Member

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    I am about to try TMY-2 in 35mm. I am planning to run tests on exposure/ development along lines of David Vestal's method - 4 test rolls, each with a series of exposures from 5 stops under to 5 stops over. One roll at recommended development time (Rodinal 1:50 for me), one roll at twice recommended time, and one at half. Forth roll held for fine tuning.

    My question: TMY-2 by many accounts is very reactive to changes in development. Will twice and half development times take me too far out, even for push & pull times? Should I initially test at perhaps recommended and 1/3 over and 1/3 under? (I am interested in push and pull times as long as I am testing.)

    Ken
     
  2. trexx

    trexx Member

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    When doing subjective test such as this, as opposed to plotting as in WBZS and WBM, I often do √2 * Std_time for upper and half that for lower.
    So if the time is you would do is 11 than 8 and 16 would be the low and high, or if 5.5 was norm then 4 and 8. This is a progression we have sen before.
    This works well for me as often normal is is about 5.5 minutes, and 2:45 is just an unworkable time in the developer. Too many other things go wrong that short.
     
  3. tkamiya

    tkamiya Member

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    How far are you going to push/pull in your usage?

    I've done quite a bit of that and the problem really is combination of exposure and development both. You can easily get really dense negatives but they are printable - they just look really dense. In every day use, I rarely do more than 25% from published figures and that includes one stop push and pull. I usually do either EI400 and -10% or EI200 and -20 to -25%` depending on lighting condition.

    I use D-76 by the way.
     
  4. Stephen Benskin

    Stephen Benskin Member

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    I suggest considering a different testing method.
     
  5. KenR

    KenR Member

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    With Rodinal you'll get a fair amount of grain with TMY2 and really won't see the advantages of the film - its low grain in most developers. If you want the convenience and longevity of Rodinal, I would suggest HC110. An all around compromise - not the finest grain, not the sharpest, but much like D-76, pretty good at everything. With TMY2 I use dilution H, which is 1/2 strength dilution B (equal to 1:63), for 11 minutes at 68 degrees.