TX400 35 mm vs 120 mm.

Discussion in 'B&W: Film, Paper, Chemistry' started by Henry Alive, Jun 29, 2009.

  1. Henry Alive

    Henry Alive Subscriber

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    I have been taken photos with TX400 for a long time in 35 mm, and I am very pleased with it. I work at EI200, with HC110 (E= 1:47), 20ºC, for 6 minutes. When I develop it, I always make a pre-washed of 1 minute with water at the same temperature.
    Yesterday, I took some photos with TX400, 120 mm, with a Mamiya 645M that a friend of mine lent to me. I decided to work at EI200, since I guess it is the same film that I have been using with my 35 mm camera. However, when I made the pre-washed, I got a blue colour in the water that I had not ever gotten with TX400 35 mm. The final result was satisfactory.
    The question is: Are TX400 35 mm and TX400 120 mm the same film?
     
  2. Anon Ymous

    Anon Ymous Member

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    Nothing wrong with that Henry, it's the antihalation layer that dissolved in the water.
     
  3. jim appleyard

    jim appleyard Member

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    Only Kodak ( and maybe PE) knows for sure. There has often been speculation on whether different sized films are the same base and/or emulsion; very few of us know. Some folks will get a slightly different dev time for one size than another, fueling the speculation.
     
  4. Ian David

    Ian David Subscriber

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    FWIW, I occasionally develop TX400 35mm and 120 in the same roll-film tank at the same time with no problems.
     
  5. kodachrome64

    kodachrome64 Member

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    In my experience they are the same film but on different bases, which is not unusual I think?
     
  6. Henry Alive

    Henry Alive Subscriber

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    Thanks for your answers. I am going to consider like they are the same film.
    Henry.
     
  7. BetterSense

    BetterSense Member

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    I thought 120 was always on a thinner base, on account of 35mm having sprocket holes and such.

    The bluest film I've ever seen is Foma 400/Arista.EDU Ultra. The developer looks like Kool-aid when you pour it out, and the film retains a bright blue tint after processing.
     
  8. PhotoJim

    PhotoJim Member

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    By the way, a common error: it's not 120 mm. It's 120. It's about 60 mm wide actually.

    35mm film is code 135. 220 film is the same width as 120, but twice as long.
     
  9. kodachrome64

    kodachrome64 Member

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    You know what's funny about that is that some store websites (B&H I think, for instance) list it as 120mm. I see it all over the place like that. Oh well, I guess people think it's similar to 35mm instead of the film code like 135.
     
  10. PhotoJim

    PhotoJim Member

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    Absolutely common! And entirely wrong :smile:

    I see it a good percentage of the time.
     
  11. like2fiddle

    like2fiddle Member

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    Just another example of why we should always question "conventional wisdom"

    Perhaps it's just my imagination, or the fact that the film is wider, but I have always gotten the impression the 120 had a thinner film base than 135.
     
  12. wogster

    wogster Member

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    It does, because it's used differently. 35mm film has the perforations, it's on a thick base to keep from tearing out the perforations. 120 film often needs to go through sharp bends in the camera, so it's on a thin base. There isn't a huge difference though for example Ilford coats FP4 35mm on a .125mm base and 120 on a .110m base, so a difference of .015mm, that's a pretty small amount, when you consider that .015mm is less then 0.0006 inches.
     
  13. JPD

    JPD Member

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    Foma use a blueish film base for this film, so it will not help to fix or wash it longer.