Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,911   Posts: 1,556,240   Online: 933
      
Page 1 of 2 12 LastLast
Results 1 to 10 of 13
  1. #1

    Join Date
    Sep 2010
    Location
    England
    Shooter
    4x5 Format
    Posts
    37

    C-41 Problem with Jobo expert drum/CPP/Digibase

    Hi all,

    (Long time lurker and have learn't a lot from APUG in the past few months)

    Wonder if anyone could let me know whats happening with these two 5x4 Ektar negs?
    They have come out the 2 separate runs and the other 3 negs in each run came out perfect.
    I'm using a Jobo expert drum with no pre soak and the digibase C-41 kit as one shot, following the instructions as printed, using 250ml dev.
    Rotation is around 50rpm, one way. Can't understand why the other negs are fine and these have streaks across them?

    (I've tried a re-bleach and re-fix)

    (Please excuse rubbish scans, had a long day and yes the ground should be red and the line on the right is some railings)

    Regards
    Ed
    Attached Thumbnails Attached Thumbnails neg1.jpg   neg2.jpg  

  2. #2

    Join Date
    Apr 2006
    Shooter
    8x10 Format
    Posts
    45
    I do not have solution.

    But I have similar issue when using print drum to develop 8x10. Usually one is ok and the other is not. After listen to PE, I wonder now whether this is due to lack of pre-soak. The negative would face a temperature shock induced by the hot water coming in. Unlike BTZS tube and even for expert drum, one wonder whether the negative can be warm up to the degree of high temp. required by C41/E6.

    Looking forward for other comments to know more.

  3. #3
    Greg Davis's Avatar
    Join Date
    Feb 2004
    Location
    Crestview Hills, KY
    Shooter
    8x10 Format
    Posts
    1,939
    Are you pouring the chemicals in while the drum is rotating?
    www.gregorytdavis.com

    Did millions of people suddenly disappear? This may have an answer.

    "No one knows that day or hour, not even the angels in heaven, nor the Son, but only the Father." -Matthew 24:36

  4. #4
    Sirius Glass's Avatar
    Join Date
    Jan 2007
    Location
    Southern California
    Shooter
    Multi Format
    Posts
    13,190
    The first thing I would suspect is the lack of presoaking. Jobo recommends presoaking film for all processing except with XTOL.

    Steve
    Warning!! Handling a Hasselblad can be harmful to your financial well being!

    Nothing beats a great piece of glass!

    I leave the digital work for the urologists and proctologists.

  5. #5
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    23,187
    Images
    65
    Those are developer streaks. The developer is not wetting the film evenly and probably the temperature is not fully up to 100F.

    It may also be made worse by slow (one way?) rotation. (did I read the OP right? One way rotation, not oscillation?) Slow or one way rotation is not good. Jobo listed an updated rotation recommendation quite a few years ago in which the larger the tank diameter, the higher the rotation rate. This is logical. I now use 5 or 6 for the back and forth rotation of my drums.

    You should never use one way rotation!

    A prewet does not hurt. See the thread where someone tested drum temperatures with and without prewet.

    PE

  6. #6
    msage's Avatar
    Join Date
    Mar 2003
    Location
    Washington State USA
    Shooter
    Large Format
    Posts
    273
    I never had this happen to me. I use one way rotation, but I use more solution and always use a pre-soak. Use more solution and a pre-soak.
    Michael

    "I only wanted Uncle Vern standing by his new car (a Hudson) on a clear day. I got him and the car. I also got a bit of Aunt Mary's laundry, and Beau Jack, the dog, peeing on a fence, and a row of potted tuberous begonias on the porch and 78 trees and a million pebbles in the driveway and more. It's a generous medium, photography." -- Lee Friedlander

  7. #7

    Join Date
    Nov 2009
    Location
    Capital of Oregon Territory
    Shooter
    Multi Format
    Posts
    778
    You did not mention which expert drum you are using. Make sure you use enough solution. The 3004 and 3005 require 270ml of solution, so your 250ml of developer could have been the culprit as well if you used one of those.
    Also, I'll second the presoak recommendation, works like a charm.

  8. #8
    DanielStone's Avatar
    Join Date
    Dec 2008
    Location
    Los Angeles
    Shooter
    Multi Format
    Posts
    2,981
    Images
    1
    how long are you guys pre-wetting for btw?

    -Dan

  9. #9
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    23,187
    Images
    65
    I prewet with 2 soaks of 30" each with a 7" drain.

    PE

  10. #10
    Sirius Glass's Avatar
    Join Date
    Jan 2007
    Location
    Southern California
    Shooter
    Multi Format
    Posts
    13,190
    PE recommends doing two 30 second instead of one 30 second pre-wet.

    Steve
    Warning!! Handling a Hasselblad can be harmful to your financial well being!

    Nothing beats a great piece of glass!

    I leave the digital work for the urologists and proctologists.

Page 1 of 2 12 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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