tmax 100, rodinal 1:50 12min 20c too thin

Discussion in 'B&W: Film, Paper, Chemistry' started by nc5p, Jan 1, 2008.

  1. nc5p

    nc5p Member

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    I did a 120 roll of tmax 100 in rodinal 1:50 for 12 min. at 20c last night and the results were noticeably thin. I don't have a densitomiter (unless there is a way of measuring it using a film scanner?) I plan on trying some prints this afternoon but the negatives were well exposed, in fact I usually meter for 64 iso on this film. I've developed it before in tmax developer and they always came out much denser. Is this a normal thing for this film/dev, should I try 1:25 next time, or simply extend the developer time? What times are you folks using in this combination? I mix using appropriate graduated cylinders and the concentrate is stored in a tightly sealed dark glass bottle.
     
  2. Snapshot

    Snapshot Member

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    Hmmm... that's what I've been using and my results are fine. Is this the first time with this combination? It's possible you didn't use quite enough developer. I had something similar happen with a staining developer. I apparently didn't quite use enough developer and my negatives turned out thin. It's easy to do when you are dealing with concentrate formulas.
     
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  3. Ian Grant

    Ian Grant Subscriber

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    The dev time & temp sounds about right, I've shot a lot of Tmax 100 & processed in Rodinal, but I preferred to use 3:100 dilution for my normal development only using 1:50 for contrasty subject matter. 1:25 I always found too problematic giving excessive negative conttrast. I did extensive Zone system tests to get dilutions & dev times that suited my printing requirements.

    Remember that slight variations in water, thermometers, shutters, lightmeters can all play a small part in affecting the right times etc that you require, and may have played a part in your negs being thin.

    Ian
     
  4. BobNewYork

    BobNewYork Member

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    I've been using Rodinal 1:100 with a 20 min dev time at 20 deg C for quite a while now and it works well for me. Boring, but it gives me what I want.
     
  5. Thomas Bertilsson

    Thomas Bertilsson Subscriber

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    Did you have enough shadow detail? If yes - develop longer. If no, check your light meter and/or give more exposure.

    It is a fine combination that I used a lot in 35mm once. I too had thin negatives when I started out. So I started exposing the film to an exposure index of 50, and I increased the amount of developer agent in the tank, as a matter of fact, I always filled it to capacity just to make sure the developer didn't exhaust. That was more of an issue with the 1:100 dilution. 1:50 should not exhaust if you cover the spool fully and add some on top of that.

    - Thomas